WO2021084693A1 - Transmission device, reception device, communication system, control circuit, storage medium, and communication method - Google Patents

Transmission device, reception device, communication system, control circuit, storage medium, and communication method Download PDF

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Publication number
WO2021084693A1
WO2021084693A1 PCT/JP2019/042823 JP2019042823W WO2021084693A1 WO 2021084693 A1 WO2021084693 A1 WO 2021084693A1 JP 2019042823 W JP2019042823 W JP 2019042823W WO 2021084693 A1 WO2021084693 A1 WO 2021084693A1
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transmission
block
unit
continuous
signal
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PCT/JP2019/042823
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French (fr)
Japanese (ja)
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歌奈子 山口
昭範 中島
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三菱電機株式会社
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Priority to PCT/JP2019/042823 priority Critical patent/WO2021084693A1/en
Priority to JP2021553992A priority patent/JP6987328B2/en
Publication of WO2021084693A1 publication Critical patent/WO2021084693A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system

Definitions

  • the present invention relates to a transmitting device, a receiving device, a communication system, a control circuit, a storage medium, and a communication method for continuously transmitting a block-coded signal at a plurality of base stations.
  • satellite base stations can be installed near the cell boundaries, and the satellite base stations can reduce the effects of weak electric fields by transmitting the same signals as the base stations at the same frequency. it can.
  • the transmission signal from the base station and the transmission signal from the satellite base station have an opposite phase relationship, the transmission signals cancel each other out, and beat interference occurs in which the received power decreases.
  • Patent Document 1 discloses a technique for reducing the occurrence of beat interference by transmitting signals having different timings and frequency deviations from two antennas in each of the two base stations.
  • the mobile station that receives the signal performs adaptive equivalence processing to transmit and synthesize signals with different timings.
  • the present invention has been made in view of the above, and an object of the present invention is to obtain a transmitting device capable of reducing the influence of beat interference in a receiving device when a plurality of transmitting devices transmit signals.
  • the transmitting device of the present invention performs block coding on two or more transmitting antennas and a modulated signal, and transmits from each of the two or more transmitting antennas.
  • the block coding unit that generates the transmission signal to be transmitted and the block coding unit by the block coding unit are blocks, and a process of adding a different weighting coefficient to the transmission signal in block units is transmitted. It is characterized by including a weighted continuous transmission signal generation unit that repeatedly executes the signal as many times as the number of continuous transmissions for transmitting the signal.
  • the transmitting device has an effect that when a plurality of transmitting devices transmit signals, the influence of beat interference in the receiving device can be reduced.
  • the figure which shows the structural example of the processing circuit in the case where the processing circuit provided in the transmitting device and the receiving device which concerns on Embodiment 1 is realized by a processor and memory.
  • the figure which shows the example of the processing circuit in the case where the processing circuit provided in the transmitting device and the receiving device which concerns on Embodiment 1 is configured by the dedicated hardware.
  • the transmitting device the receiving device, the communication system, the control circuit, the storage medium, and the communication method according to the embodiment of the present invention will be described in detail with reference to the drawings.
  • the present invention is not limited to this embodiment.
  • FIG. 1 is a diagram showing a configuration example of a communication system 3 according to a first embodiment of the present invention.
  • the communication system 3 includes transmission devices 1a and 1b and reception devices 2a.
  • FIG. 1 also shows a configuration example of the transmitting devices 1a and 1b and the receiving device 2a.
  • the transmission device 1a includes a block coding unit 10a, a weighted continuous transmission signal generation unit 11a, and transmission antennas 12a and 12b.
  • the transmission device 1b includes a block coding unit 10b, a weighted continuous transmission signal generation unit 11b, and transmission antennas 12c and 12d.
  • Transmission devices 1a and 1b are examples of two or more base stations.
  • the transmitting antennas 12a to 12d are examples of transmitting antennas provided with two or more transmitting antennas per base station.
  • the transmitters 1a and 1b have the same configuration.
  • the transmission devices 1a and 1b when the transmission devices 1a and 1b are not distinguished, they are referred to as a transmission device 1, and when the block coding units 10a and 10b are not distinguished, they are referred to as a block coding unit 10, and the weighted continuous transmission signal generation units 11a and 11b.
  • the weighted continuous transmission signal generation units 11a and 11b When the above is not distinguished, it may be referred to as a weighted continuous transmission signal generation unit 11, and when the transmission antennas 12a to 12d are not distinguished, it may be referred to as a transmission antenna 12.
  • the block coding units 10a and 10b perform spatiotemporal block coding (hereinafter referred to as STBC (Space Time Block Coding) coding) on a modulated signal (hereinafter, a symbol that is primarily modulated) from the outside (not shown).
  • the block coding unit 10a generates transmission signals transmitted from each of the transmission antennas 12a and 12b, which are two or more transmission antennas.
  • the block coding unit 10b generates transmission signals transmitted from each of the transmission antennas 12c and 12d, which are two or more transmission antennas.
  • the block coding units 10a and 10b output a block coded signal which is a transmission signal generated by performing STBC coding.
  • the weighted continuous transmission signal generation units 11a and 11b generate continuous transmission signals which are transmission signals for the number of continuous transmissions. Specifically, the weighted continuous transmission signal generation units 11a and 11b use a block coding unit by the block coding units 10a and 10b to be connected as a block, and transmit the block-encoded transmission signal with respect to the transmission device. The process of adding a different weighting coefficient for each block is repeated as many times as the number of consecutive transmissions in which the transmission signal is transmitted a plurality of times. That is, the weighted continuous transmission signal generation units 11a and 11b generate the continuous transmission signal by adding weights different for each transmission device 1 to the block coded signal for each block coding unit according to the number of continuous transmissions. ..
  • the weighted continuous transmission signal generation unit 11a generates a continuous transmission signal which is a transmission signal transmitted from each of the transmission antennas 12a and 12b.
  • the weighted continuous transmission signal generation unit 11b generates a continuous transmission signal which is a transmission signal transmitted from each of the transmission antennas 12c and 12d.
  • the transmission antennas 12a and 12b transmit the transmission signal output from the weighted continuous transmission signal generation unit 11a as a radio wave.
  • the transmission antennas 12c and 12d transmit a continuous transmission signal, which is a transmission signal output from the weighted continuous transmission signal generation unit 11b, as a radio wave.
  • the communication system 3 in the case where the number of transmission devices 1 is 2, the number of transmission antennas 12 included in each transmission device 1 is 2, and the number of continuous transmissions is 2 will be described as an example.
  • the communication system 3 is not limited to the case where the number of transmission devices 1 is 2, and can be applied to the case where the number of transmission devices 1 is 3 or more. Further, the communication system 3 is not limited to the case where the number of transmitting antennas 12 included in the transmitting device 1 is 2, and can be applied to the case where the number of transmitting antennas 12 included in the transmitting device 1 is 3 or more. Further, the communication system 3 is not limited to the case where the number of continuous transmissions is 2, and can be applied to the case where the number of continuous transmissions is 3 or more.
  • the communication system 3 may include two or more transmitting devices 1, and each transmitting device 1 may include two or more transmitting antennas 12. Further, in the communication system 3, as will be described later, the receiving device 2a includes a transmitting antenna output power detection unit 21 according to the number of transmitting antennas 12, a continuous transmission block power detecting unit 22 according to the number of continuous transmissions, and a portion thereof. It suffices to include a decoding unit 24.
  • each transmission device 1 When there are three or more transmission devices 1, the same primary modulation symbol is input to each transmission device 1, and each transmission device 1 generates a transmission signal and transmits it from each transmission antenna 12. When there are three or more transmitting antennas 12, each transmitting device 1 generates transmission signals corresponding to the number of transmitting antennas 12 and transmits them from the corresponding transmitting antennas 12. The receiving device 2a measures the received power of the transmission signal transmitted from each transmitting antenna 12 by the corresponding transmitting antenna output power detecting unit 21. When the number of continuous transmissions is 3 or more, each transmission device 1 generates and transmits the transmission signals weighted in block coding units by the weighted continuous transmission signal generation unit 11 as many times as the number of continuous transmissions.
  • the receiving device 2a measures the received power of the transmission signal for each continuous transmission by the continuous transmission block power detection unit 22.
  • the weighted continuous transmission signal generation unit 11 is not limited to the case where the number of transmission antennas 12 is 2 and the number of continuous transmissions is 2, and the number of transmission antennas 12 is 3 or more and continuous transmission. It can also be applied when the number of feeds is 3 or more.
  • the partial decoding unit 24 and the total decoding unit 25 are not limited to the case where the number of continuous transmissions is 2, and can be applied to the case where the number of continuous transmissions is 3 or more.
  • the transmitting devices 1a and 1b include components not shown in FIG. May be good.
  • the transmission devices 1a and 1b may include a filter, an analog unit that performs analog signal processing, and the like, in addition to the components shown in FIG.
  • the communication system 3 shown in FIG. 1 includes transmission devices 1a and 1b, but the block coding unit 10 and the weighted continuous transmission signal generation unit 11 of one transmission device 1 include the number of continuous transmissions and the transmission antenna. You may generate block coded signals for twelve lines.
  • the signal input to the transmission devices 1a and 1b may be a transmission bit sequence, and the transmission devices 1a and 1b may perform primary modulation on the transmission bit sequence which is an input signal.
  • the transmission devices 1a and 1b include a primary modulation unit in front of the block coding units 10a and 10b.
  • the primary modulation unit generates a modulation signal for the transmission bit sequence by a modulation method such as an FSK (Frequency Shift Keying) method, and outputs the modulation signal to the weighted continuous transmission signal generation units 11a and 11b.
  • the transmission bit sequence may be a bit sequence that has undergone preprocessing such as interleaving and error correction coding.
  • the STBC coding unit is referred to as a “block”, and the primary modulated data unit is referred to as a “symbol”.
  • the receiving device 2a receives a transmission signal, which is a block-encoded signal continuously transmitted by the transmitting devices 1a and 1b, as a receiving signal.
  • the configuration of the receiving device 2a will be described.
  • the receiving device 2a includes the receiving antenna 20, the transmitting antenna output power detecting units 21a to 21d, the continuous transmission block power detecting units 22a and 22b, the block decoding unit selection unit 23, the partial decoding units 24a and 24b, and the entire decoding.
  • a unit 25 and a continuous feed synthesis unit 26 are provided.
  • transmission antenna output power detection units 21a to 21d when the transmission antenna output power detection units 21a to 21d are not distinguished, they are referred to as transmission antenna output power detection units 21, and when the continuous transmission block power detection units 22a and 22b are not distinguished, the continuous transmission block power detection units 22 When the partial decoding units 24a and 24b are not distinguished, the partial decoding unit 24 may be referred to.
  • the receiving antenna 20 receives the transmission signal transmitted from the transmitting devices 1a and 1b as a receiving signal.
  • the receiving antenna 20 outputs the received transmission signal to the transmitting antenna output power detecting units 21a to 21d, the continuous transmission block power detecting units 22a and 22b, and the block decoding unit selection unit 23.
  • the transmission antenna output power detection units 21a to 21d calculate the reception power for each transmission signal transmitted from the transmission antennas 12a to 12d using the reception signals received by the reception antenna 20.
  • the transmission antenna output power detection unit 21a calculates the reception power of the transmission signal transmitted from the transmission antenna 12a of the transmission device 1a
  • the transmission antenna output power detection unit 21b calculates the transmission transmitted from the transmission antenna 12b of the transmission device 1a. Calculate the received power of the signal.
  • the transmission antenna output power detection unit 21c calculates the reception power of the transmission signal transmitted from the transmission antenna 12c of the transmission device 1b
  • the transmission antenna output power detection unit 21d calculates the transmission transmitted from the transmission antenna 12d of the transmission device 1b. Calculate the received power of the signal.
  • the continuous transmission block power detection units 22a and 22b use the reception signals received by the reception antenna 20 to transmit the transmission signals transmitted from the transmission antennas 12a to 12d of the transmission devices 1a and 1b in block units for each number of consecutive transmissions. Calculate the received power of. For example, the continuous transmission block power detection unit 22a calculates the first reception power of the number of continuous transmissions in block units for the transmission signals transmitted from the transmission antennas 12a to 12d. Further, the continuous transmission block power detection unit 22b calculates the second reception power of the number of continuous transmissions in block units for the transmission signals transmitted from the transmission antennas 12a to 12d.
  • the block decoding unit selection unit 23 selects the block decoding unit based on the received power calculated by the transmission antenna output power detection units 21a to 21d and the continuous transmission block power detection units 22a and 22b. The specific selection method in the block decoding unit selection unit 23 will be described later.
  • the partial decoding units 24a and 24b perform block decoding using a part of the received signals of the block-encoded signals continuously transmitted as many times as the number of times of continuous transmission, and the decoding result is obtained by the continuous transmission synthesis unit 26 in the subsequent stage. Output to.
  • the overall decoding unit 25 performs block decoding using all the received signals of the block-encoded signals transmitted continuously as many times as the number of times of continuous transmission, and outputs the decoding result.
  • the continuous feed synthesis unit 26 calculates the continuous feed synthesis result using the decoding results partially decoded by the partial decoding units 24a and 24b.
  • the continuous transmission synthesis unit 26 is output from the partial decoding units 24a and 24b based on the received power calculated by the transmission antenna output power detection units 21a to 21d or the continuous transmission block power detection units 22a and 22b. Select whether to select or synthesize the decoding result, and calculate the continuous synthesis result.
  • the input signals may be subjected to preprocessing such as error correction coding and primary modulation in the transmission devices 1a and 1b.
  • the receiving device 2a obtains the demodulation result by performing demodulation corresponding to the primary modulation method for the decoding result obtained by the overall decoding unit 25 or the continuous feed synthesis unit 26, and makes an error with respect to the demodulation result.
  • Decoding processing corresponding to preprocessing such as error correction decoding corresponding to correction coding is performed.
  • FIG. 1 shows an example in which the receiving device 2a includes one receiving antenna 20, the receiving device 2a may include a plurality of receiving antennas 20.
  • the receiving device 2a includes a plurality of receiving antennas 20, in the receiving device 2a, a receiving diversity decoding unit (not shown) provided after the receiving antenna 20 synthesizes the received signals received by the plurality of receiving antennas 20.
  • the transmission antenna output power detection units 21a to 21d and the continuous transmission block power detection units 22a and 22b calculate the reception power using the reception signal synthesized by the reception diversity decoding unit (not shown). That is, the receiving device 2a includes one or more receiving antennas 20.
  • FIG. 1 illustrates the components related to the baseband signal processing among the components actually included in the receiving device 2a, but the receiving device 2a may include components not shown in FIG.
  • the receiving device 2a may include a filter, an analog unit that performs analog signal processing, and the like.
  • the receiving device 2a also performs processing such as time synchronization processing, frequency synchronization processing, and transmission line estimation.
  • processing such as time synchronization processing, frequency synchronization processing, and transmission line estimation.
  • FIG. 2 is a flowchart showing an example of the processing procedure of the transmission devices 1a and 1b according to the first embodiment. The details of each process will be described later.
  • the block coding units 10a and 10b generate a block coded signal by performing block coding on the input primary modulation symbol (step S101).
  • the block coded signal includes symbols corresponding to each of the transmitting antennas 12a to 12d as described later.
  • the weighted continuous transmission signal generation units 11a and 11b add different weighting coefficients to the block coded signal for each transmission device 1 according to the number of continuous transmissions, and generate a transmission signal (step S102).
  • the weighted continuous transmission signal generation units 11a and 11b block-code the weighting coefficients which are different for each transmission device 1 and whose weighting coefficients are orthogonal to each other in the continuous transmission section which is the section in which the continuous transmission signals which are a plurality of transmission signals are transmitted. Add to the signal.
  • the weighting coefficient is a value that is orthogonal between the transmission devices 1a and 1b and orthogonal to the number of consecutive transmissions of the transmission devices 1a and 1b in the continuous transmission section.
  • the values orthogonal to each other during the number of times of continuous transmission are the transmission signal transmitted from one transmission antenna 12 of the transmission device 1 and the transmission transmitted from the other transmission antenna 12 of the transmission device 1 at each time of continuous transmission. It is a value orthogonal to the signal.
  • the weighted continuous transmission signal generation units 11a and 11b repeat the process of adding the weighting coefficient to the block coded signal as many times as the number of continuous transmissions.
  • the interference between the transmitting signals causes beat interference in which the received power of the receiving device is lowered, and the transmission quality is deteriorated.
  • a different weighting coefficient is added to each transmission device 1 in units of block coded signals.
  • the weighted continuous transmission signal generation units 11a and 11b cause beat interference with respect to the block-encoded transmission signal, for example, based on at least one of the received power in the receiving device 2a and the channel variation in the continuous transmission section.
  • the process of adding a weighting coefficient that reduces the influence is repeated as many times as the number of continuous feeds.
  • the transmission antennas 12a to 12d transmit the corresponding transmission signals output from the weighted continuous transmission signal generation units 11a and 11b as radio waves. As a result, the transmitting devices 1a and 1b transmit the transmission signal to the receiving device 2a (step S103).
  • s (bold) is a vertical vector having s (m, 1) and s (m, 2) as elements. It becomes.
  • s (m, n) indicates the nth symbol in the mth STBC block.
  • m and n are natural numbers.
  • the maximum value of n is the number of symbols in one block, which is the processing unit of STBC coding, and is determined according to the number of transmitting antennas 12 and the transmitting rate. When the number of transmitting antennas 12 is 2 and the transmitting rate is 1, the maximum value of n is 2.
  • the STBC coded signal matrix z (m) (bold), which is the block coded signal output from the block coded units 10a and 10b, can be represented by the following equation (1).
  • z (q) (m, n) indicates the nth symbol in the mth STBC block transmitted from the qth transmitting antenna 12.
  • q is a natural number, and in the configuration example shown in FIG. 1, the transmitting antenna 12a and the transmitting antenna 12c are the first transmitting antennas (z (1) ), and the transmitting antenna 12b and the transmitting antenna 12d are the second transmitting antennas. (Z (2) ). Since the block coding units 10a and 10b perform the same STBC coding on the same modulated signal vector, the block coding units 10a and 10b output the same signal.
  • ( ⁇ ) * indicates a complex conjugate.
  • the weighted continuous transmission signal generation units 11a and 11b add weighting coefficients that are different for each transmission device 1 and orthogonal to the STBC coded signal matrix z (m) (bold) in the continuous transmission section.
  • the weighted continuous transmission signal generation units 11a and 11b generate a transmission signal by repeating the process of adding a weighting coefficient to the STBC coded signal matrix z (m) (bold) as many times as the number of continuous transmissions, and the transmission antenna 12a. , 12b is output.
  • the transmission signal matrix x (1) (m) (bold), x (2) (m) (bold) of the m-th STBC block to which the weighting coefficient in the transmission devices 1a and 1b is added is given by the following equation (2).
  • equation (3) can be expressed by equation (3).
  • x (p) (m) indicates the transmission signal matrix in the m-th STBC block in the p-th transmission device 1.
  • p is a natural number.
  • a (p) and (k) indicate the weighting coefficient in the kth continuous transmission in the p-th transmitting device 1, and can be expressed by the following equation (4).
  • k is a natural number and j is an imaginary unit.
  • b (p) and c (p) indicate a coefficient that gives a different phase rotation amount and amplitude value for each transmission device 1.
  • the weighting coefficients a (p) (k), b (p) and c (p) are values that satisfy the following conditions.
  • b (1) ⁇ b (2) ⁇ ... ⁇ b (P), and a (p) (bold) [a (p) (0) a (p) (1) ... a (p) ( When K)] is set, a (1) (bold), a (2) (bold), ..., A (P) (bold) are orthogonal to each other.
  • a different weighting coefficient is added to the block coded signal in block units for each transmission device 1, and this is repeated for the number of times of continuous transmission.
  • FIG. 3 is a flowchart showing an example of the processing procedure of the receiving device 2a according to the first embodiment. The details of each process will be described later.
  • the transmission antenna output power detection units 21a to 21d use the reception signal received by the reception antenna 20 to obtain the reception power when the transmission signal transmitted from the corresponding transmission antennas 12a to 12d is received by the reception antenna 20. Calculate (step S201).
  • the continuous transmission block power detection units 22a and 22b use the received signal received by the receiving antenna 20 to obtain the received power for each continuous transmission number of the transmission signals transmitted from the transmission devices 1a and 1b, that is, in the continuous transmission unit. Calculate (step S202).
  • the block decoding unit selection unit 23 selects a unit for performing block decoding, that is, a block decoding unit, based on the received power calculated by the transmission antenna output power detection units 21a to 21d and the continuous transmission block power detection units 22a and 22b. (Step S203).
  • step S203 partial decoding
  • the block decoding unit selection unit 23 When partial decoding is selected as the block decoding unit (step S203: partial decoding), the block decoding unit selection unit 23 outputs the received power and the received signal to the partial decoding units 24a and 24b.
  • the partial decoding units 24a and 24b block decode, that is, STBC, using a part of the received signals in the continuous transmission section, specifically, using the received signals received in the first or second continuous transmission.
  • Decryption is performed (step S204).
  • the continuous feed synthesis unit 26 calculates the continuous feed synthesis result using the decoding results output from the partial decoding units 24a and 24b (step S205).
  • the continuous transmission synthesis unit 26 selects the decoding result output from the partial decoding units 24a and 25b based on the received power calculated by the transmission antenna output power detection units 21a to 21d or the continuous transmission block power detection units 22a and 22b. Alternatively, it is synthesized and the continuous feed synthesis result is output.
  • the block decoding unit selection unit 23 selects total decoding as the block decoding unit (step S203: total decoding)
  • the block decoding unit selection unit 23 outputs the received power and the received signal to the total decoding unit 25.
  • the overall decoding unit 25 performs block decoding, that is, STBC decoding, using all the received signals in the continuous transmission section, specifically, using the received signals received in the first and second continuous transmissions ( Step S206).
  • the receiving device 2a Assuming that the received signal in the m-th STBC block received by the receiving antenna 20 is r (m) (bold), it can be expressed by the following equation (5) from equations (1) to (3).
  • r (m, k, n) represents the nth symbol in the kth continuous transmission of the mth STBC block.
  • the noise component included in the received signal is omitted.
  • the receiving device 2a is generated by adding a different weighting coefficient to each transmitting device 1 and continuously transmitting the transmission signal. Can reliably receive the signal.
  • the transmission antenna output power detection units 21a to 21d use the reception signal matrix r (m) (bold) represented by the equation (5) to obtain the reception power of the transmission signal transmitted from each transmission antenna 12. calculate.
  • the received power from each transmitting antenna 12 in the m-th STBC block can be expressed by the following equation (7) using the signal sequence x (m) represented by the following equation (6).
  • the weighted continuous transmission signal generation units 11a and 11b add weighting coefficients that are different for each transmission device 1 and that are orthogonal to each other to the block coded signal.
  • the transmission antenna output power detection units 21a to 21d of the reception device 2a can calculate the reception power of the transmission signal transmitted from each transmission antenna 12.
  • the operating status of each transmitting antenna 12 can be observed, which has the effect of simplifying maintenance work.
  • the continuous transmission block power detection units 22a and 22b use the received signals received for the first or second continuous transmission in the received signal matrix r (m) (bold) represented by the equation (5), respectively. Calculate the received power for the number of consecutive transmissions.
  • the block decoding unit selection unit 23 selects the block decoding unit based on the received power calculated by the transmission antenna output power detection units 21a to 21d and the continuous transmission block power detection units 22a and 22b. For example, when the reception power of the transmission signal transmitted from the transmission device 1a is low in the reception power from each transmission antenna 12 represented by the equation (7), the block decoding unit selection unit 23 selects the overall decoding unit 25. Block decoding may be performed using all the received signals corresponding to the transmitted signals transmitted from the transmitting device 1b in the continuous transmission section. Further, the block decoding unit selection unit 23 is a partial decoding unit that performs block decoding using only the received signal of the second continuous transmission when the reception power of the first continuous transmission calculated by the continuous transmission block power detection unit 22a is low. 24b may be selected. The block decoding unit selection unit 23 does not need to select one of the partial decoding units 24a and 24b, and may select a plurality or all of the partial decoding units 24a and 24b.
  • the block decoding unit selection unit 23 selects the block decoding unit based on the received power calculated by the transmission antenna output power detection units 21a to 21d and the continuous transmission block power detection units 22a and 22b.
  • the block decoding unit selection unit 23 may select the block decoding unit based on the propagation path condition of the continuous transmission section such as the transmission line estimated value calculated by the transmission line estimation unit (not shown in FIG. 1). For example, when the propagation path variation for each block is large, the block decoding unit selection unit 23 may select the partial decoding units 24a and 24b in order to reduce the influence of the propagation path variation.
  • the block decoding unit selection unit 23 selects a block decoding unit based on at least one of the received power and the propagation path condition.
  • the block decoding unit selection unit 23 receives a large reception power when each reception power is not within the specified first range based on the reception power calculated by the transmission antenna output power detection units 21a to 21d. Partial decoding units 24a and 24b that perform block decoding using signals are selected. When each received power is within the first range, the block decoding unit selection unit 23 selects the overall decoding unit 25 that performs block decoding using all the received signals.
  • the block decoding unit selection unit 23 is continuously transmitted. Partial decoding units 24a and 24b that perform block decoding using one or more reception signals having a large reception power in the transmission section are selected.
  • the block decoding unit selection unit 23 selects the overall decoding unit 25 that performs block decoding using the reception signals of all the reception timings in the continuous transmission section.
  • the block decoding unit selection unit 23 when the block decoding unit selection unit 23 is not within the third range in which the fluctuation of the propagation path condition in the continuous transmission section is defined based on the propagation path condition, the fluctuation of the propagation path condition in the continuous transmission section is small. Partial decoding units 24a and 24b that perform block decoding using one or more received signals are selected. The block decoding unit selection unit 23 selects the overall decoding unit 25 that performs block decoding using all the received signals in the continuous transmission section when the fluctuation of the propagation path condition in the continuous transmission section is within the third range.
  • the partial decoding units 24a and 24b perform block decoding represented by the following equations (8) to (11) using the received signals received at the first and second continuous transmissions.
  • the receiving device 2a shown in FIG. 1 includes two partial decoding units 24a and 24b, but is not limited thereto.
  • the receiving device 2a may sequentially perform block decoding at each continuous transmission number by one partial decoding unit 24.
  • the receiving device 2a includes a partial decoding unit 24 that performs block decoding using the received signal received at the second symbol of the first continuous transmission and the received signal received at the first symbol of the second continuous transmission. You may.
  • the receiving device 2a includes three or more partial decoding units 24 when the number of continuous transmissions is three or more, performs block decoding using the received signal at each continuous transmission number, and also performs block decoding using the received signal at each continuous transmission number. Block decoding may be performed using the received signal in.
  • the overall decoding unit 25 performs block decoding represented by the following equations (12) and (13) using the received signals at all the continuous transmission times in the m-th STBC block.
  • the partial decoding units 24a and 24b that block-decode using a part of the received signals can obtain only the diversity gain in which the channel gains of the transmitting devices 1a and 1b are combined.
  • the overall decoding unit 25 can obtain the channel gains of all four transmitting antennas 12 included in the communication system 3 as diversity gains. That is, when compared from the viewpoint of diversity gain, the overall decoding unit 25 is better.
  • the partial decoding units 24a and 24b perform block decoding using only the channels at each transmission number.
  • decoding is performed on the assumption that the channel variation in the block used for decoding is constant, so that the decoding gain decreases as the channel variation in the block increases. Therefore, when the channel variation in the continuous feed section is large, the decoding characteristics of the overall decoding unit 25 that performs block decoding using more symbols deteriorates.
  • the receiving device 2a not only reduces the influence of beat interference but also optimally decodes by selecting the block decoding unit according to the received power due to beat interference, the channel variation in each transmitting antenna 12, and the like. Make it possible to acquire characteristics.
  • the continuous feed synthesis unit 26 compares the block decoding results of the first and second continuous feeds output from the partial decoding units 24a and 24b, and the one with the better decoding gain in each modulation signal is the continuous feed synthesis result. Select as and output.
  • the continuous transmission synthesis unit 26 weights and synthesizes the decoding results of the partial decoding units 24a and 24b based on the received power calculated by the transmission antenna output power detection units 21a to 21d and the continuous transmission block power detection units 22a and 22b. However, it may be output as a continuous feed synthesis result.
  • the continuous transmission signal in the m-th STBC block is assumed to be continuously transmitted and received in time, but the continuous transmission is performed.
  • the second block-encoded signal matrix may be transmitted and received.
  • the synthesis unit 26 operates by using the received signal corresponding to the block number m.
  • the coding of the communication system 3 other coding can be applied as long as it is a block coding in which a plurality of symbols are coded as a unit.
  • the transmitting antenna 12 is realized by the antenna device.
  • the block coding unit 10 and the weighted continuous signal generation unit 11 are realized by a processing circuit.
  • the receiving antenna 20 is realized by the antenna device.
  • the transmission antenna output power detection unit 21, the continuous transmission block power detection unit 22, the block decoding unit selection unit 23, the partial decoding unit 24, the total decoding unit 25, and the continuous transmission synthesis unit 26 are realized by a processing circuit.
  • the processing circuit may be a processor and memory for executing a program stored in the memory, or may be dedicated hardware.
  • the processing circuit is also called a control circuit.
  • FIG. 4 is a diagram showing a configuration example of a processing circuit when the processing circuit included in the transmitting device 1 and the receiving device 2a according to the first embodiment is realized by a processor and a memory.
  • the processing circuit 300 shown in FIG. 4 is a control circuit and includes a processor 300a and a memory 300b.
  • each function of the processing circuit is realized by software, firmware, or a combination of software and firmware.
  • the software or firmware is written as a program and stored in the memory 300b.
  • each function is realized by the processor 300a reading and executing the program stored in the memory 300b.
  • the processing circuit includes a memory 300b for storing a program in which the processing of the block coding unit 10 and the weighted continuous signal generation unit 11 is eventually executed in the transmission device 1.
  • the processing circuit includes a transmitting antenna output power detection unit 21, a continuous transmission block power detection unit 22, a block decoding unit selection unit 23, a partial decoding unit 24, an overall decoding unit 25, and a continuous transmission synthesis unit 26.
  • a memory 300b for storing a program for which the processing of the above is to be executed as a result is provided. It can be said that this program is a program for causing the transmitting device 1 or the receiving device 2a to execute each function realized by the processing circuit.
  • This program may be provided by a storage medium in which the program is stored, or may be provided by other means such as a communication medium.
  • the block coding unit 10 performs block coding on the modulated signal and generates a transmission signal transmitted from each of the two or more transmission antennas 12.
  • the block coding step to be performed and the weighted continuous transmission signal generation unit 11 use the block coding unit by the block coding unit 10 as a block, and add a different weighting coefficient to the transmission signal for each block unit. It can be said that this is a program for causing the transmission device 1 to execute a weighted continuous transmission signal generation step of repeating the processing for the number of consecutive transmissions for transmitting the transmission signal a plurality of times.
  • the transmitting antenna output power detection unit 21 uses the received signal to transmit each of the two or more transmitting antennas 12 included in the transmitting device 1.
  • the transmission antenna output power detection step for calculating the reception power for each transmission signal and the transmission signal that the continuous transmission block power detection unit 22 is block-encoded in the transmission device 1 using the reception signal and transmitted from the transmission device 1. It can also be said that this is a program for causing the receiving device 2a to execute the continuous transmission block power detection step of calculating the received power for each continuous transmission in the block-encoded block unit.
  • the block decoding unit selection unit 23 determines the received power and the propagation path condition of the continuous transmission section in which the continuous transmission signal which is a plurality of transmission signals is transmitted from the transmission device to the reception device.
  • a block decoding unit selection step of selecting a block decoding unit based on at least one of them, and a partial decoding unit 24 block decoding using a part of the received signals of the continuously transmitted block coded signals.
  • the partial decoding step of performing block decoding by the total decoding unit 25 using all the received signals of the continuously transmitted block-encoded signals, and the partial decoding unit 26 of the continuous transmission synthesis unit 26 is a program for causing the receiving device 2a to execute the continuous transmission synthesis step of calculating the continuous transmission synthesis result using the decoding result partially decoded by the decoding unit 24.
  • the processor 300a is, for example, a CPU (Central Processing Unit), a processing device, an arithmetic unit, a microprocessor, a microcomputer, a DSP (Digital Signal Processor), or the like.
  • the memory 300b is, for example, non-volatile or volatile such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable ROM), and EPROM (registered trademark) (Electrically EPROM). This includes semiconductor memories, magnetic disks, flexible disks, optical disks, compact disks, mini disks, DVDs (Digital Versatile Disc), and the like.
  • FIG. 5 is a diagram showing an example of a processing circuit in the case where the processing circuit included in the transmitting device 1 and the receiving device 2a according to the first embodiment is configured by dedicated hardware.
  • the processing circuit 300c shown in FIG. 5 is, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or a combination thereof. The thing is applicable.
  • the processing circuit a part may be realized by dedicated hardware and a part may be realized by software or firmware.
  • the processing circuit can realize each of the above-mentioned functions by the dedicated hardware, software, firmware, or a combination thereof.
  • the transmission devices 1a and 1b block-encode a plurality of primary-modulated symbols, and for each transmission device 1 with respect to the block-coded signal as many times as the number of continuous transmissions.
  • the operation of adding different weighting coefficients is repeated.
  • the receiving device 2a measures the received power for each transmission antenna 12 or the number of continuous transmissions, blocks-decodes the blocks in units selected based on the received power, and continuously synthesizes the decoding results.
  • the same signal is transmitted by the receiving device 2a by adding weighting coefficients that are different for each transmitting device 1 and orthogonal to each other to the block coded signal by the number of times of continuous transmission. Even when beat interference occurs between a plurality of transmitting devices 1 that transmit at time, the signal can be reliably received.
  • Embodiment 2 In the first embodiment, the weighting coefficient added in the weighted continuous transmission signal generation units 11a and 11b is fixed. In the second embodiment, the weighting coefficient in each transmitting device 1 is adaptively changed based on the received power in the receiving device. A part different from the first embodiment will be described.
  • FIG. 6 is a diagram showing a configuration example of the receiving device 2b according to the second embodiment.
  • the receiving device 2b is obtained by adding a weighting coefficient control unit 27 to the receiving device 2a.
  • the communication system 3 of the present embodiment is the same as the communication system 3 of the first embodiment except that the weighting coefficient control unit 27 is additionally provided for the receiving device 2a shown in FIG.
  • the weighting coefficient control unit 27 uses the received powers calculated by the transmission antenna output power detection units 21a to 21d and the continuous transmission block power detection units 22a and 22b to generate weighted continuous transmission signals in the transmission devices 1a and 1b.
  • the weighting coefficient is specified for 11a and 11b. For example, when the received power of the first continuous transmission calculated by the continuous transmission block power detection unit 22a is small, it means that the signal from the transmission device 1a and the signal from the transmission device 1b are received in the same phase. ..
  • the receiving device 2b has the effect that the signal is received with twice the received power at any continuous transmission time, and the continuous transmission combined gain is further increased.
  • the weighting coefficient control unit 27 may notify the weighting continuous transmission signal generation units 11a and 11b of the weighting coefficient, and the transmission antenna output power detection units 21a to 21d and the continuous transmission block power detection units 22a and 22b. The received power calculated in the above may be notified.
  • the weighting coefficient control unit 27 may notify other parameters that indicate the weighting coefficient.
  • the weighting coefficient control unit 27 is provided in the receiving device 2b, and the weighted continuous transmission signal generation units 11a and 11b are notified, but the present invention is not limited to this.
  • the weighting coefficient control unit 27 may be provided in the transmission devices 1a and 1b, respectively.
  • the receiving device 2b transmits the received power received by the receiving antenna 20, the received power calculated by the transmitting antenna output power detecting units 21a to 21d and the continuous transmission block power detecting units 22a, 22b, and the like. Notify the weighting coefficient control unit 27 included in 1b.
  • the weighting coefficient control unit 27 exerts the same effect by instructing the weighting continuous signal generation units 11a and 11b of the weighting coefficient.
  • the receiving device 2b uses a transmission function (not shown) to transmit. It is possible to communicate with the devices 1a and 1b. Similarly, the transmitting devices 1a and 1b can communicate with the receiving device 2b by using a receiving function (not shown).
  • the receiving device 2b changes the phase rotation amount given to the transmitting device 1 according to the received power and the received power at each time.
  • the signal can be received at any time, and the continuous transmission combined gain can be improved, that is, the transmission quality can be improved.
  • the configuration shown in the above-described embodiment shows an example of the content of the present invention, can be combined with another known technique, and is one of the configurations without departing from the gist of the present invention. It is also possible to omit or change the part.
  • 1a, 1b transmitter, 2a, 2b receiver, 3 communication system 10a, 10b block coding unit, 11a, 11b weighted continuous signal generator, 12a-12d transmitter antenna, 20 receiver antenna, 21a-21d transmitter antenna output Power detection unit, 22a, 22b continuous transmission block power detection unit, 23 block decoding unit selection unit, 24a, 24b partial decoding unit, 25 total decoding unit, 26 continuous transmission synthesis unit, 27 weighting coefficient control unit.

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Abstract

Transmission devices according to the present invention each comprise: two or more transmission antennas (12a, 12b); a block encoding unit (10a) that performs block encoding of modulated signals and generates transmission signals to be transmitted from each of the two or more transmission antennas (12a, 12b); and a weighted successively-transmitted signal generation unit (11a) that repetitively implements a process a number of times in which a respective weighting factor, which is different between the transmission devices, is added to the transmission signals on a block-by-block basis, wherein a unit of block encodings performed by the block encoding unit (10a) is defined as a block and wherein the number of times corresponds to the number of successive transmissions in a plurality of transmissions of the transmission signals.

Description

送信装置、受信装置、通信システム、制御回路、記憶媒体および通信方法Transmitters, receivers, communication systems, control circuits, storage media and communication methods
　本発明は、複数の基地局でブロック符号化された信号を複数回連送する送信装置、受信装置、通信システム、制御回路、記憶媒体および通信方法に関する。 The present invention relates to a transmitting device, a receiving device, a communication system, a control circuit, a storage medium, and a communication method for continuously transmitting a block-coded signal at a plurality of base stations.
　従来、無線通信システムにおいて、基地局がカバーするセルの境界付近では、電界強度の低下による通信品質の劣化が生じる。このような問題に対して、セルの境界付近にサテライト基地局を設置し、サテライト基地局が、基地局と同一の信号を同一の周波数で送信することによって、弱電界による影響を低減することができる。一方で、基地局からの送信信号とサテライト基地局からの送信信号とが逆位相の関係になった場合、お互いに送信信号を相殺してしまい、受信電力が低下するビート干渉が発生する。 Conventionally, in a wireless communication system, communication quality deteriorates due to a decrease in electric field strength near the boundary of cells covered by a base station. To solve such problems, satellite base stations can be installed near the cell boundaries, and the satellite base stations can reduce the effects of weak electric fields by transmitting the same signals as the base stations at the same frequency. it can. On the other hand, when the transmission signal from the base station and the transmission signal from the satellite base station have an opposite phase relationship, the transmission signals cancel each other out, and beat interference occurs in which the received power decreases.
　特許文献１には、２つの基地局の各々が、２つのアンテナからタイミングおよび周波数偏差の異なる信号を送信することによって、ビート干渉の発生を低減する技術が開示されている。信号を受信する移動局は、適応等価処理を行って、タイミングの異なる信号を送信および合成する。 Patent Document 1 discloses a technique for reducing the occurrence of beat interference by transmitting signals having different timings and frequency deviations from two antennas in each of the two base stations. The mobile station that receives the signal performs adaptive equivalence processing to transmit and synthesize signals with different timings.
特開２００２－３０００９７号公報JP-A-2002-300977
　しかしながら、上記従来の技術によれば、信号を受信する移動局では、適応等価処理が必要となるため演算量が増大する、という問題があった。また、基地局間で異なる周波数偏差を与えた場合、移動局における周波数偏差の耐性が低いと通信品質が劣化する、という問題があった。 However, according to the above-mentioned conventional technique, there is a problem that the amount of calculation increases because the mobile station that receives the signal requires adaptive equivalence processing. Further, when different frequency deviations are given between base stations, there is a problem that communication quality deteriorates if the frequency deviation tolerance of the mobile station is low.
　本発明は、上記に鑑みてなされたものであって、複数の送信装置が信号を送信する場合に、受信装置においてビート干渉による影響を低減可能な送信装置を得ることを目的とする。 The present invention has been made in view of the above, and an object of the present invention is to obtain a transmitting device capable of reducing the influence of beat interference in a receiving device when a plurality of transmitting devices transmit signals.
　上述した課題を解決し、目的を達成するために、本発明の送信装置は、２本以上の送信アンテナと、変調信号に対してブロック符号化を行い、２本以上の送信アンテナの各々から送信される送信信号を生成するブロック符号化部と、ブロック符号化部によるブロック符号化の単位をブロックとし、送信信号に対して、送信装置ごとに異なる重み付け係数をブロック単位で付加する処理を、送信信号を複数回送信する連送回数の数だけ繰り返し実施する重み付け連送信号生成部と、を備えることを特徴とする。 In order to solve the above-mentioned problems and achieve the object, the transmitting device of the present invention performs block coding on two or more transmitting antennas and a modulated signal, and transmits from each of the two or more transmitting antennas. The block coding unit that generates the transmission signal to be transmitted and the block coding unit by the block coding unit are blocks, and a process of adding a different weighting coefficient to the transmission signal in block units is transmitted. It is characterized by including a weighted continuous transmission signal generation unit that repeatedly executes the signal as many times as the number of continuous transmissions for transmitting the signal.
　本発明に係る送信装置は、複数の送信装置が信号を送信する場合に、受信装置においてビート干渉による影響を低減できる、という効果を奏する。 The transmitting device according to the present invention has an effect that when a plurality of transmitting devices transmit signals, the influence of beat interference in the receiving device can be reduced.
実施の形態１に係る通信システムの構成例を示す図The figure which shows the configuration example of the communication system which concerns on Embodiment 1. 実施の形態１に係る送信装置の処理手順の一例を示すフローチャートA flowchart showing an example of a processing procedure of the transmitting device according to the first embodiment. 実施の形態１に係る受信装置の処理手順の一例を示すフローチャートA flowchart showing an example of a processing procedure of the receiving device according to the first embodiment. 実施の形態１に係る送信装置および受信装置が備える処理回路をプロセッサおよびメモリで実現する場合の処理回路の構成例を示す図The figure which shows the structural example of the processing circuit in the case where the processing circuit provided in the transmitting device and the receiving device which concerns on Embodiment 1 is realized by a processor and memory. 実施の形態１に係る送信装置および受信装置が備える処理回路を専用のハードウェアで構成する場合の処理回路の例を示す図The figure which shows the example of the processing circuit in the case where the processing circuit provided in the transmitting device and the receiving device which concerns on Embodiment 1 is configured by the dedicated hardware. 実施の形態２に係る受信装置の構成例を示す図The figure which shows the structural example of the receiving apparatus which concerns on Embodiment 2.
　以下に、本発明の実施の形態に係る送信装置、受信装置、通信システム、制御回路、記憶媒体および通信方法を図面に基づいて詳細に説明する。なお、この実施の形態によりこの発明が限定されるものではない。 Hereinafter, the transmitting device, the receiving device, the communication system, the control circuit, the storage medium, and the communication method according to the embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to this embodiment.
実施の形態１．
　図１は、本発明の実施の形態１に係る通信システム３の構成例を示す図である。通信システム３は、送信装置１ａ，１ｂと、受信装置２ａと、を備える。図１では、送信装置１ａ，１ｂおよび受信装置２ａの構成例も示している。 Embodiment 1.
FIG. 1 is a diagram showing a configuration example of a communication system 3 according to a first embodiment of the present invention. The communication system 3 includes transmission devices 1a and 1b and reception devices 2a. FIG. 1 also shows a configuration example of the transmitting devices 1a and 1b and the receiving device 2a.
　送信装置１ａは、ブロック符号化部１０ａと、重み付け連送信号生成部１１ａと、送信アンテナ１２ａ，１２ｂと、を備える。送信装置１ｂは、ブロック符号化部１０ｂと、重み付け連送信号生成部１１ｂと、送信アンテナ１２ｃ，１２ｄと、を備える。送信装置１ａ，１ｂは、２つ以上の基地局の一例である。送信アンテナ１２ａ～１２ｄは、基地局あたり２本以上備えられる送信アンテナの一例である。送信装置１ａ，１ｂは同様の構成である。以降の説明において、送信装置１ａ，１ｂを区別しない場合は送信装置１と称し、ブロック符号化部１０ａ，１０ｂを区別しない場合はブロック符号化部１０と称し、重み付け連送信号生成部１１ａ，１１ｂを区別しない場合は重み付け連送信号生成部１１と称し、送信アンテナ１２ａ～１２ｄを区別しない場合は送信アンテナ１２と称することがある。 The transmission device 1a includes a block coding unit 10a, a weighted continuous transmission signal generation unit 11a, and transmission antennas 12a and 12b. The transmission device 1b includes a block coding unit 10b, a weighted continuous transmission signal generation unit 11b, and transmission antennas 12c and 12d. Transmission devices 1a and 1b are examples of two or more base stations. The transmitting antennas 12a to 12d are examples of transmitting antennas provided with two or more transmitting antennas per base station. The transmitters 1a and 1b have the same configuration. In the following description, when the transmission devices 1a and 1b are not distinguished, they are referred to as a transmission device 1, and when the block coding units 10a and 10b are not distinguished, they are referred to as a block coding unit 10, and the weighted continuous transmission signal generation units 11a and 11b. When the above is not distinguished, it may be referred to as a weighted continuous transmission signal generation unit 11, and when the transmission antennas 12a to 12d are not distinguished, it may be referred to as a transmission antenna 12.
　ブロック符号化部１０ａ，１０ｂは、図示しない外部から変調信号、ここでは一次変調されたシンボルに対して、時空間ブロック符号化（以下、ＳＴＢＣ（Space　Time　Block　Coding）符号化とする）を行う。ブロック符号化部１０ａは、２本以上の送信アンテナである送信アンテナ１２ａ，１２ｂのそれぞれから送信される送信信号を生成する。ブロック符号化部１０ｂは、２本以上の送信アンテナである送信アンテナ１２ｃ，１２ｄのそれぞれから送信される送信信号を生成する。ブロック符号化部１０ａ，１０ｂは、ＳＴＢＣ符号化を行って生成された送信信号であるブロック符号化信号を出力する。 The block coding units 10a and 10b perform spatiotemporal block coding (hereinafter referred to as STBC (Space Time Block Coding) coding) on a modulated signal (hereinafter, a symbol that is primarily modulated) from the outside (not shown). The block coding unit 10a generates transmission signals transmitted from each of the transmission antennas 12a and 12b, which are two or more transmission antennas. The block coding unit 10b generates transmission signals transmitted from each of the transmission antennas 12c and 12d, which are two or more transmission antennas. The block coding units 10a and 10b output a block coded signal which is a transmission signal generated by performing STBC coding.
　重み付け連送信号生成部１１ａ，１１ｂは、連送回数分の送信信号である連送信号を生成する。具体的には、重み付け連送信号生成部１１ａ，１１ｂは、各々接続されるブロック符号化部１０ａ，１０ｂによるブロック符号化の単位をブロックとし、ブロック符号化された送信信号に対して、送信装置１ごとに異なる重み付け係数をブロック単位で付加する処理を、送信信号を複数回送信する連送回数の数だけ繰り返し実施する。すなわち、重み付け連送信号生成部１１ａ，１１ｂは、連送回数の数だけ、送信装置１ごとに異なる重み付けをブロック符号化の単位ごとにブロック符号化信号へ付加して、連送信号を生成する。重み付け連送信号生成部１１ａは、送信アンテナ１２ａ，１２ｂの各々から送出される送信信号である連送信号を生成する。重み付け連送信号生成部１１ｂは、送信アンテナ１２ｃ，１２ｄの各々から送出される送信信号である連送信号を生成する。 The weighted continuous transmission signal generation units 11a and 11b generate continuous transmission signals which are transmission signals for the number of continuous transmissions. Specifically, the weighted continuous transmission signal generation units 11a and 11b use a block coding unit by the block coding units 10a and 10b to be connected as a block, and transmit the block-encoded transmission signal with respect to the transmission device. The process of adding a different weighting coefficient for each block is repeated as many times as the number of consecutive transmissions in which the transmission signal is transmitted a plurality of times. That is, the weighted continuous transmission signal generation units 11a and 11b generate the continuous transmission signal by adding weights different for each transmission device 1 to the block coded signal for each block coding unit according to the number of continuous transmissions. .. The weighted continuous transmission signal generation unit 11a generates a continuous transmission signal which is a transmission signal transmitted from each of the transmission antennas 12a and 12b. The weighted continuous transmission signal generation unit 11b generates a continuous transmission signal which is a transmission signal transmitted from each of the transmission antennas 12c and 12d.
　送信アンテナ１２ａ，１２ｂは、重み付け連送信号生成部１１ａから出力された送信信号を電波として送出する。送信アンテナ１２ｃ，１２ｄは、重み付け連送信号生成部１１ｂから出力された送信信号である連送信号を電波として送出する。 The transmission antennas 12a and 12b transmit the transmission signal output from the weighted continuous transmission signal generation unit 11a as a radio wave. The transmission antennas 12c and 12d transmit a continuous transmission signal, which is a transmission signal output from the weighted continuous transmission signal generation unit 11b, as a radio wave.
　本実施の形態では、送信装置１の数が２、各送信装置１が備える送信アンテナ１２の本数が２、連送回数が２、の場合の通信システム３を例にして説明する。なお、通信システム３は、送信装置１の数が２の場合に限定されず、送信装置１の数が３以上の場合にも適用できる。また、通信システム３は、送信装置１が備える送信アンテナ１２の本数が２の場合に限定されず、送信装置１が備える送信アンテナ１２の本数が３以上の場合にも適用できる。また、通信システム３は、連送回数が２の場合に限定されず、連送回数が３以上の場合にも適用できる。すなわち、通信システム３は、２以上の送信装置１を備え、各送信装置１が、２本以上の送信アンテナ１２を備えていればよい。また、通信システム３は、受信装置２ａが、後述するように、送信アンテナ１２の本数に応じた送信アンテナ出力電力検出部２１と、連送回数に応じた連送ブロック電力検出部２２と、部分復号部２４と、を備えていればよい。 In the present embodiment, the communication system 3 in the case where the number of transmission devices 1 is 2, the number of transmission antennas 12 included in each transmission device 1 is 2, and the number of continuous transmissions is 2 will be described as an example. The communication system 3 is not limited to the case where the number of transmission devices 1 is 2, and can be applied to the case where the number of transmission devices 1 is 3 or more. Further, the communication system 3 is not limited to the case where the number of transmitting antennas 12 included in the transmitting device 1 is 2, and can be applied to the case where the number of transmitting antennas 12 included in the transmitting device 1 is 3 or more. Further, the communication system 3 is not limited to the case where the number of continuous transmissions is 2, and can be applied to the case where the number of continuous transmissions is 3 or more. That is, the communication system 3 may include two or more transmitting devices 1, and each transmitting device 1 may include two or more transmitting antennas 12. Further, in the communication system 3, as will be described later, the receiving device 2a includes a transmitting antenna output power detection unit 21 according to the number of transmitting antennas 12, a continuous transmission block power detecting unit 22 according to the number of continuous transmissions, and a portion thereof. It suffices to include a decoding unit 24.
　送信装置１が３以上ある場合、各送信装置１には同一の一次変調シンボルが入力され、各送信装置１が、送信信号を生成して各送信アンテナ１２から送出する。また、送信アンテナ１２が３本以上ある場合、各送信装置１が、送信アンテナ１２の本数分の送信信号を生成して対応する送信アンテナ１２から送出する。受信装置２ａは、各送信アンテナ１２から送出された送信信号の受信電力を、対応する送信アンテナ出力電力検出部２１で測定する。また、連送回数が３以上の場合、各送信装置１が、重み付け連送信号生成部１１においてブロック符号化単位で重み付けされた送信信号を連送回数の数だけ生成して送出する。受信装置２ａは、連送ごとの送信信号の受信電力を、連送ブロック電力検出部２２で測定する。また、送信装置１において、重み付け連送信号生成部１１は、送信アンテナ１２の本数が２の場合および連送回数が２の場合に限定されず、送信アンテナ１２の本数が３以上の場合および連送回数が３以上の場合にも適用できる。受信装置２ａにおいて、部分復号部２４および全体復号部２５は、連送回数が２の場合に限定されず、連送回数が３以上の場合にも適用できる。 When there are three or more transmission devices 1, the same primary modulation symbol is input to each transmission device 1, and each transmission device 1 generates a transmission signal and transmits it from each transmission antenna 12. When there are three or more transmitting antennas 12, each transmitting device 1 generates transmission signals corresponding to the number of transmitting antennas 12 and transmits them from the corresponding transmitting antennas 12. The receiving device 2a measures the received power of the transmission signal transmitted from each transmitting antenna 12 by the corresponding transmitting antenna output power detecting unit 21. When the number of continuous transmissions is 3 or more, each transmission device 1 generates and transmits the transmission signals weighted in block coding units by the weighted continuous transmission signal generation unit 11 as many times as the number of continuous transmissions. The receiving device 2a measures the received power of the transmission signal for each continuous transmission by the continuous transmission block power detection unit 22. Further, in the transmission device 1, the weighted continuous transmission signal generation unit 11 is not limited to the case where the number of transmission antennas 12 is 2 and the number of continuous transmissions is 2, and the number of transmission antennas 12 is 3 or more and continuous transmission. It can also be applied when the number of feeds is 3 or more. In the receiving device 2a, the partial decoding unit 24 and the total decoding unit 25 are not limited to the case where the number of continuous transmissions is 2, and can be applied to the case where the number of continuous transmissions is 3 or more.
　図１では、送信装置１ａ，１ｂが実際に備える構成要素のうちベースバンド信号処理にかかる構成要素を図示しているが、送信装置１ａ，１ｂは、図１に図示しない構成要素を備えていてもよい。例えば、送信装置１ａ，１ｂは、図１に示す構成要素に加えて、フィルタ、アナログ信号処理を行うアナログ部などを備えていてもよい。また、図１に示す通信システム３は送信装置１ａ，１ｂを備えているが、１つの送信装置１のブロック符号化部１０および重み付け連送信号生成部１１において、連送回数の数および送信アンテナ１２の本数分のブロック符号化信号を生成してもよい。 In FIG. 1, among the components actually included in the transmitting devices 1a and 1b, the components related to the baseband signal processing are illustrated, but the transmitting devices 1a and 1b include components not shown in FIG. May be good. For example, the transmission devices 1a and 1b may include a filter, an analog unit that performs analog signal processing, and the like, in addition to the components shown in FIG. Further, the communication system 3 shown in FIG. 1 includes transmission devices 1a and 1b, but the block coding unit 10 and the weighted continuous transmission signal generation unit 11 of one transmission device 1 include the number of continuous transmissions and the transmission antenna. You may generate block coded signals for twelve lines.
　また、送信装置１ａ，１ｂに入力される信号を送信ビット系列とし、送信装置１ａ，１ｂが、入力信号である送信ビット系列に対して一次変調を施してもよい。この場合、送信装置１ａ，１ｂは、ブロック符号化部１０ａ，１０ｂの前段に一次変調部を備える。一次変調部は、送信ビット系列に対してＦＳＫ（Frequency　Shift　Keying）方式などの変調方式によって変調信号を生成し、重み付け連送信号生成部１１ａ，１１ｂへ出力する。なお、送信ビット系列は、インタリーブ、誤り訂正符号化等の前処理が施されたビット系列であってもよい。 Further, the signal input to the transmission devices 1a and 1b may be a transmission bit sequence, and the transmission devices 1a and 1b may perform primary modulation on the transmission bit sequence which is an input signal. In this case, the transmission devices 1a and 1b include a primary modulation unit in front of the block coding units 10a and 10b. The primary modulation unit generates a modulation signal for the transmission bit sequence by a modulation method such as an FSK (Frequency Shift Keying) method, and outputs the modulation signal to the weighted continuous transmission signal generation units 11a and 11b. The transmission bit sequence may be a bit sequence that has undergone preprocessing such as interleaving and error correction coding.
　本実施の形態では、送信ダイバーシチ方式、すなわち、ＳＴＢＣ符号化として、Ｓ．Ｍ．Ａｌａｍｏｕｔｉ，“Ａ　Ｓｉｍｐｌｅ　Ｔｒａｎｓｍｉｔ　Ｄｉｖｅｒｓｉｔｙ　Ｔｅｃｈｎｉｑｕｅ　ｆｏｒ　Ｗｉｒｅｌｅｓｓ　Ｃｏｍｍｕｎｉｃａｔｉｏｎｓ”，ＩＥＥＥ　Ｊｏｕｒｎａｌ　ｏｎ　Ｓｅｌｅｃｔ　Ａｒｅａｓ　ｉｎ　Ｃｏｍｍｕｎｉｃａｔｉｏｎｓ，Ｖｏｌ．１６，Ｎｏ．８，ｐｐ．１４５１－１４５８，Ｏｃｔｏｂｅｒ　１９９８．で開示されているＡｌａｍｏｕｔｉ符号化を用いることを前提とする。また、本実施の形態では、ＳＴＢＣ符号化単位を「ブロック」、一次変調されたデータ単位を「シンボル」と称する。 In the present embodiment, as a transmission diversity method, that is, STBC coding, S.A. M. Aramouti, "A Simple Transmit Diversity Technology Technology for Wireless Communications", IEEE Journal on Select Areas in Communications, Vol. 16, No. 8, pp. 1451-1458, October 1998. It is assumed that the Alamouti coding disclosed in the above is used. Further, in the present embodiment, the STBC coding unit is referred to as a “block”, and the primary modulated data unit is referred to as a “symbol”.
　受信装置２ａは、送信装置１ａ，１ｂによって連送されたブロック符号化信号である送信信号を受信信号として受信する。受信装置２ａの構成について説明する。受信装置２ａは、受信アンテナ２０と、送信アンテナ出力電力検出部２１ａ～２１ｄと、連送ブロック電力検出部２２ａ，２２ｂと、ブロック復号単位選択部２３と、部分復号部２４ａ，２４ｂと、全体復号部２５と、連送合成部２６と、を備える。以降の説明において、送信アンテナ出力電力検出部２１ａ～２１ｄを区別しない場合は送信アンテナ出力電力検出部２１と称し、連送ブロック電力検出部２２ａ，２２ｂを区別しない場合は連送ブロック電力検出部２２と称し、部分復号部２４ａ，２４ｂを区別しない場合は部分復号部２４と称することがある。 The receiving device 2a receives a transmission signal, which is a block-encoded signal continuously transmitted by the transmitting devices 1a and 1b, as a receiving signal. The configuration of the receiving device 2a will be described. The receiving device 2a includes the receiving antenna 20, the transmitting antenna output power detecting units 21a to 21d, the continuous transmission block power detecting units 22a and 22b, the block decoding unit selection unit 23, the partial decoding units 24a and 24b, and the entire decoding. A unit 25 and a continuous feed synthesis unit 26 are provided. In the following description, when the transmission antenna output power detection units 21a to 21d are not distinguished, they are referred to as transmission antenna output power detection units 21, and when the continuous transmission block power detection units 22a and 22b are not distinguished, the continuous transmission block power detection units 22 When the partial decoding units 24a and 24b are not distinguished, the partial decoding unit 24 may be referred to.
　受信アンテナ２０は、送信装置１ａ，１ｂから送出された送信信号を受信信号として受信する。受信アンテナ２０は、受信した送信信号を送信アンテナ出力電力検出部２１ａ～２１ｄ、連送ブロック電力検出部２２ａ，２２ｂ、およびブロック復号単位選択部２３へ出力する。 The receiving antenna 20 receives the transmission signal transmitted from the transmitting devices 1a and 1b as a receiving signal. The receiving antenna 20 outputs the received transmission signal to the transmitting antenna output power detecting units 21a to 21d, the continuous transmission block power detecting units 22a and 22b, and the block decoding unit selection unit 23.
　送信アンテナ出力電力検出部２１ａ～２１ｄは、受信アンテナ２０で受信された受信信号を用いて、送信アンテナ１２ａ～１２ｄから送出された各々の送信信号ごとの受信電力を算出する。例えば、送信アンテナ出力電力検出部２１ａは送信装置１ａの送信アンテナ１２ａから送出された送信信号の受信電力を算出し、送信アンテナ出力電力検出部２１ｂは送信装置１ａの送信アンテナ１２ｂから送出された送信信号の受信電力を算出する。また、送信アンテナ出力電力検出部２１ｃは送信装置１ｂの送信アンテナ１２ｃから送出された送信信号の受信電力を算出し、送信アンテナ出力電力検出部２１ｄは送信装置１ｂの送信アンテナ１２ｄから送出された送信信号の受信電力を算出する。 The transmission antenna output power detection units 21a to 21d calculate the reception power for each transmission signal transmitted from the transmission antennas 12a to 12d using the reception signals received by the reception antenna 20. For example, the transmission antenna output power detection unit 21a calculates the reception power of the transmission signal transmitted from the transmission antenna 12a of the transmission device 1a, and the transmission antenna output power detection unit 21b calculates the transmission transmitted from the transmission antenna 12b of the transmission device 1a. Calculate the received power of the signal. Further, the transmission antenna output power detection unit 21c calculates the reception power of the transmission signal transmitted from the transmission antenna 12c of the transmission device 1b, and the transmission antenna output power detection unit 21d calculates the transmission transmitted from the transmission antenna 12d of the transmission device 1b. Calculate the received power of the signal.
　連送ブロック電力検出部２２ａ，２２ｂは、受信アンテナ２０で受信された受信信号を用いて、送信装置１ａ，１ｂの送信アンテナ１２ａ～１２ｄから送出された送信信号について、ブロック単位で連送回数ごとの受信電力を算出する。例えば、連送ブロック電力検出部２２ａは、送信アンテナ１２ａ～１２ｄから送出された送信信号について、ブロック単位で連送回数の１回目の受信電力を算出する。また、連送ブロック電力検出部２２ｂは、送信アンテナ１２ａ～１２ｄから送出された送信信号について、ブロック単位で連送回数の２回目の受信電力を算出する。 The continuous transmission block power detection units 22a and 22b use the reception signals received by the reception antenna 20 to transmit the transmission signals transmitted from the transmission antennas 12a to 12d of the transmission devices 1a and 1b in block units for each number of consecutive transmissions. Calculate the received power of. For example, the continuous transmission block power detection unit 22a calculates the first reception power of the number of continuous transmissions in block units for the transmission signals transmitted from the transmission antennas 12a to 12d. Further, the continuous transmission block power detection unit 22b calculates the second reception power of the number of continuous transmissions in block units for the transmission signals transmitted from the transmission antennas 12a to 12d.
　ブロック復号単位選択部２３は、送信アンテナ出力電力検出部２１ａ～２１ｄおよび連送ブロック電力検出部２２ａ，２２ｂで算出された受信電力に基づいて、ブロック復号単位を選択する。ブロック復号単位選択部２３における具体的な選択方法については後述する。 The block decoding unit selection unit 23 selects the block decoding unit based on the received power calculated by the transmission antenna output power detection units 21a to 21d and the continuous transmission block power detection units 22a and 22b. The specific selection method in the block decoding unit selection unit 23 will be described later.
　部分復号部２４ａ，２４ｂは、連送回数の数だけ連送されたブロック符号化信号の受信信号のうち一部の受信信号を用いてブロック復号を行い、復号結果を後段の連送合成部２６へ出力する。全体復号部２５は、連送回数の数だけ連送されたブロック符号化信号の受信信号のうち全ての受信信号を用いてブロック復号を行い、復号結果を出力する。連送合成部２６は、部分復号部２４ａ，２４ｂで部分復号された復号結果を用いて、連送合成結果を算出する。具体的には、連送合成部２６は、送信アンテナ出力電力検出部２１ａ～２１ｄまたは連送ブロック電力検出部２２ａ，２２ｂで算出された受信電力に基づいて、部分復号部２４ａ，２４ｂから出力された復号結果を選択または合成するのかを選択し、連送合成結果を算出する。 The partial decoding units 24a and 24b perform block decoding using a part of the received signals of the block-encoded signals continuously transmitted as many times as the number of times of continuous transmission, and the decoding result is obtained by the continuous transmission synthesis unit 26 in the subsequent stage. Output to. The overall decoding unit 25 performs block decoding using all the received signals of the block-encoded signals transmitted continuously as many times as the number of times of continuous transmission, and outputs the decoding result. The continuous feed synthesis unit 26 calculates the continuous feed synthesis result using the decoding results partially decoded by the partial decoding units 24a and 24b. Specifically, the continuous transmission synthesis unit 26 is output from the partial decoding units 24a and 24b based on the received power calculated by the transmission antenna output power detection units 21a to 21d or the continuous transmission block power detection units 22a and 22b. Select whether to select or synthesize the decoding result, and calculate the continuous synthesis result.
　なお、送信装置１ａ，１ｂにおいて入力信号に対して誤り訂正符号化、一次変調などの前処理が施されている場合がある。この場合、受信装置２ａは、全体復号部２５または連送合成部２６によって得られた復号結果に対して、一次変調方式に対応した復調を行うことによって復調結果を求め、復調結果に対して誤り訂正符号化に対応した誤り訂正復号など、前処理に対応した復号処理を行う。 Note that the input signals may be subjected to preprocessing such as error correction coding and primary modulation in the transmission devices 1a and 1b. In this case, the receiving device 2a obtains the demodulation result by performing demodulation corresponding to the primary modulation method for the decoding result obtained by the overall decoding unit 25 or the continuous feed synthesis unit 26, and makes an error with respect to the demodulation result. Decoding processing corresponding to preprocessing such as error correction decoding corresponding to correction coding is performed.
　また、図１では、受信装置２ａが受信アンテナ２０を１本備える例を示しているが、受信装置２ａは受信アンテナ２０を複数備えていてもよい。受信装置２ａが受信アンテナ２０を複数備える場合、受信装置２ａでは、受信アンテナ２０の後段に設ける図示しない受信ダイバーシチ復号部が、複数の受信アンテナ２０によって受信された受信信号を合成する。送信アンテナ出力電力検出部２１ａ～２１ｄおよび連送ブロック電力検出部２２ａ，２２ｂは、図示しない受信ダイバーシチ復号部によって合成された受信信号を用いて受信電力を算出する。すなわち、受信装置２ａは、１本以上の受信アンテナ２０を備える。 Further, although FIG. 1 shows an example in which the receiving device 2a includes one receiving antenna 20, the receiving device 2a may include a plurality of receiving antennas 20. When the receiving device 2a includes a plurality of receiving antennas 20, in the receiving device 2a, a receiving diversity decoding unit (not shown) provided after the receiving antenna 20 synthesizes the received signals received by the plurality of receiving antennas 20. The transmission antenna output power detection units 21a to 21d and the continuous transmission block power detection units 22a and 22b calculate the reception power using the reception signal synthesized by the reception diversity decoding unit (not shown). That is, the receiving device 2a includes one or more receiving antennas 20.
　図１では、受信装置２ａが実際に備える構成要素のうちベースバンド信号処理にかかる構成要素を図示しているが、受信装置２ａは、図１に図示しない構成要素を備えていてもよい。例えば、受信装置２ａは、フィルタ、アナログ信号処理を行うアナログ部などを備えていてもよい。なお、受信装置２ａは、時間同期処理、周波数同期処理、伝送路推定などの処理も実施するが、これらの処理は一般的な処理を適用することができるため、これらの処理を行う構成要素の図示および説明を省略する。以降の受信装置２ａの動作の説明では、時間同期処理、周波数同期処理、伝送路推定などの処理が理想的に行われるものと仮定して説明する。時間同期処理、周波数同期処理、伝送路推定などの処理が理想的に行われない場合、受信装置２ａの動作において誤差が生じる場合もあるが、誤差の対処に関する対処方法は一般的なブロック復号および連送合成を実施する受信装置と同様であるため説明を省略する。 FIG. 1 illustrates the components related to the baseband signal processing among the components actually included in the receiving device 2a, but the receiving device 2a may include components not shown in FIG. For example, the receiving device 2a may include a filter, an analog unit that performs analog signal processing, and the like. The receiving device 2a also performs processing such as time synchronization processing, frequency synchronization processing, and transmission line estimation. However, since general processing can be applied to these processing, the components that perform these processing are Illustration and description are omitted. In the following description of the operation of the receiving device 2a, it is assumed that processing such as time synchronization processing, frequency synchronization processing, and transmission line estimation is ideally performed. If processing such as time synchronization processing, frequency synchronization processing, and transmission path estimation is not ideally performed, an error may occur in the operation of the receiving device 2a, but the countermeasures for dealing with the error are general block decoding and Since it is the same as the receiving device that performs continuous transmission synthesis, the description thereof will be omitted.
　つづいて、通信システム３の動作について説明する。はじめに、送信装置１の動作について説明する。図２は、実施の形態１に係る送信装置１ａ，１ｂの処理手順の一例を示すフローチャートである。なお、各処理の詳細については後述する。 Next, the operation of the communication system 3 will be described. First, the operation of the transmission device 1 will be described. FIG. 2 is a flowchart showing an example of the processing procedure of the transmission devices 1a and 1b according to the first embodiment. The details of each process will be described later.
　ブロック符号化部１０ａ，１０ｂは、入力された一次変調シンボルに対してブロック符号化を施すことによって、ブロック符号化信号を生成する（ステップＳ１０１）。ブロック符号化信号には、後述するように送信アンテナ１２ａ～１２ｄのそれぞれに対応するシンボルが含まれている。 The block coding units 10a and 10b generate a block coded signal by performing block coding on the input primary modulation symbol (step S101). The block coded signal includes symbols corresponding to each of the transmitting antennas 12a to 12d as described later.
　重み付け連送信号生成部１１ａ，１１ｂは、連送回数の数だけ、送信装置１ごとに異なる重み付け係数をブロック符号化信号に対して付加し、送信信号を生成する（ステップＳ１０２）。重み付け連送信号生成部１１ａ，１１ｂは、送信装置１ごとに異なり、また複数の送信信号である連送信号が送信される区間である連送区間において重み付け係数が直交する重み付け係数をブロック符号化信号に対して付加する。重み付け係数は、連送区間において、送信装置１ａ，１ｂの間で直交し、送信装置１ａ，１ｂの連送回数の間で直交する値とする。連送回数の間で直交する値とは、連送される各回において、送信装置１の一方の送信アンテナ１２から送信される送信信号と、送信装置１の他方の送信アンテナ１２から送信される送信信号との間で直交する値である。重み付け連送信号生成部１１ａ，１１ｂは、重み付け係数をブロック符号化信号に対して付加する処理を連送回数の数だけ繰り返す。複数の送信装置が同一の信号を同一の周波数で送信した場合、送信信号同士の干渉によって受信装置での受信電力が低下するビート干渉が生じ、伝送品質が劣化する。本実施の形態では、ビート干渉による影響を低減するため、送信装置１ごとに異なる重み付け係数をブロック符号化信号の単位で付加する。重み付け連送信号生成部１１ａ，１１ｂは、例えば、ブロック符号化された送信信号に対して、受信装置２ａにおける受信電力、および連送区間におけるチャネル変動のうち少なくとも１つに基づいて、ビート干渉による影響が低減される重み付け係数を付加する処理を連送回数の数だけ繰り返し実施する。 The weighted continuous transmission signal generation units 11a and 11b add different weighting coefficients to the block coded signal for each transmission device 1 according to the number of continuous transmissions, and generate a transmission signal (step S102). The weighted continuous transmission signal generation units 11a and 11b block-code the weighting coefficients which are different for each transmission device 1 and whose weighting coefficients are orthogonal to each other in the continuous transmission section which is the section in which the continuous transmission signals which are a plurality of transmission signals are transmitted. Add to the signal. The weighting coefficient is a value that is orthogonal between the transmission devices 1a and 1b and orthogonal to the number of consecutive transmissions of the transmission devices 1a and 1b in the continuous transmission section. The values orthogonal to each other during the number of times of continuous transmission are the transmission signal transmitted from one transmission antenna 12 of the transmission device 1 and the transmission transmitted from the other transmission antenna 12 of the transmission device 1 at each time of continuous transmission. It is a value orthogonal to the signal. The weighted continuous transmission signal generation units 11a and 11b repeat the process of adding the weighting coefficient to the block coded signal as many times as the number of continuous transmissions. When a plurality of transmitting devices transmit the same signal at the same frequency, the interference between the transmitting signals causes beat interference in which the received power of the receiving device is lowered, and the transmission quality is deteriorated. In the present embodiment, in order to reduce the influence of beat interference, a different weighting coefficient is added to each transmission device 1 in units of block coded signals. The weighted continuous transmission signal generation units 11a and 11b cause beat interference with respect to the block-encoded transmission signal, for example, based on at least one of the received power in the receiving device 2a and the channel variation in the continuous transmission section. The process of adding a weighting coefficient that reduces the influence is repeated as many times as the number of continuous feeds.
　送信アンテナ１２ａ～１２ｄは、重み付け連送信号生成部１１ａ，１１ｂから出力された対応する送信信号を電波として送出する。これにより、送信装置１ａ，１ｂは、受信装置２ａへ向けて送信信号を送出する（ステップＳ１０３）。 The transmission antennas 12a to 12d transmit the corresponding transmission signals output from the weighted continuous transmission signal generation units 11a and 11b as radio waves. As a result, the transmitting devices 1a and 1b transmit the transmission signal to the receiving device 2a (step S103).
　次に、送信装置１ａ，１ｂの動作について詳細に説明する。送信装置１ａ，１ｂへ入力される一次変調シンボルである変調信号ベクトルをｓ（太字）とすると、ｓ（太字）は、ｓ（ｍ，１）、ｓ（ｍ，２）を要素とする縦ベクトルとなる。なお、ｓ（ｍ，ｎ）は、ｍ番目のＳＴＢＣブロックにおけるｎ番目のシンボルを示す。ｍおよびｎは自然数である。ｎの最大値は、ＳＴＢＣ符号化の処理単位である１ブロック内におけるシンボルの数であり、送信アンテナ１２の数および送信レートに応じて決定される。送信アンテナ１２の本数が２、送信レートが１のとき、ｎの最大値は２である。このとき、ブロック符号化部１０ａ，１０ｂから出力されるブロック符号化信号であるＳＴＢＣ符号化信号行列ｚ（ｍ）（太字）は、以下の式（１）で表すことができる。ｚ（ｑ）（ｍ，ｎ）はｑ番目の送信アンテナ１２から送信される、ｍ番目のＳＴＢＣブロックにおけるｎ番目のシンボルを示す。ｑは自然数であり、図１に示した構成例では、送信アンテナ１２ａおよび送信アンテナ１２ｃが１番目の送信アンテナ（ｚ（１））であり、送信アンテナ１２ｂおよび送信アンテナ１２ｄが２番目の送信アンテナ（ｚ（２））である。なお、ブロック符号化部１０ａ，１０ｂは、同一の変調信号ベクトルに対して同一のＳＴＢＣ符号化を行うため、いずれのブロック符号化部１０ａ，１０ｂにおいても同一の信号を出力する。なお、式（１）において、（・）＊は複素共役を示す。 Next, the operations of the transmission devices 1a and 1b will be described in detail. Assuming that the modulation signal vector which is the primary modulation symbol input to the transmitters 1a and 1b is s (bold), s (bold) is a vertical vector having s (m, 1) and s (m, 2) as elements. It becomes. Note that s (m, n) indicates the nth symbol in the mth STBC block. m and n are natural numbers. The maximum value of n is the number of symbols in one block, which is the processing unit of STBC coding, and is determined according to the number of transmitting antennas 12 and the transmitting rate. When the number of transmitting antennas 12 is 2 and the transmitting rate is 1, the maximum value of n is 2. At this time, the STBC coded signal matrix z (m) (bold), which is the block coded signal output from the block coded units 10a and 10b, can be represented by the following equation (1). z (q) (m, n) indicates the nth symbol in the mth STBC block transmitted from the qth transmitting antenna 12. q is a natural number, and in the configuration example shown in FIG. 1, the transmitting antenna 12a and the transmitting antenna 12c are the first transmitting antennas (z (1) ), and the transmitting antenna 12b and the transmitting antenna 12d are the second transmitting antennas. (Z (2) ). Since the block coding units 10a and 10b perform the same STBC coding on the same modulated signal vector, the block coding units 10a and 10b output the same signal. In equation (1), (・) * indicates a complex conjugate.
Figure JPOXMLDOC01-appb-M000001
Figure JPOXMLDOC01-appb-M000001
　次に、重み付け連送信号生成部１１ａ，１１ｂは、ＳＴＢＣ符号化信号行列ｚ（ｍ）（太字）に対して送信装置１ごとに異なり、また連送区間において直交する重み付け係数を付加する。重み付け連送信号生成部１１ａ，１１ｂは、ＳＴＢＣ符号化信号行列ｚ（ｍ）（太字）に対して重み付け係数を付加する処理を連送回数の数だけ繰り返して送信信号を生成し、送信アンテナ１２ａ，１２ｂへ出力する。送信装置１ａ，１ｂにおける重み付け係数が付加されたｍ番目のＳＴＢＣブロックの送信信号行列ｘ（１）（ｍ）（太字），ｘ（２）（ｍ）（太字）は、以下の式（２）および式（３）で表すことができる。ここで、ｘ（ｐ）（ｍ）は、ｐ番目の送信装置１における、ｍ番目のＳＴＢＣブロックにおける送信信号行列を示す。ｐは自然数である。 Next, the weighted continuous transmission signal generation units 11a and 11b add weighting coefficients that are different for each transmission device 1 and orthogonal to the STBC coded signal matrix z (m) (bold) in the continuous transmission section. The weighted continuous transmission signal generation units 11a and 11b generate a transmission signal by repeating the process of adding a weighting coefficient to the STBC coded signal matrix z (m) (bold) as many times as the number of continuous transmissions, and the transmission antenna 12a. , 12b is output. The transmission signal matrix x (1) (m) (bold), x (2) (m) (bold) of the m-th STBC block to which the weighting coefficient in the transmission devices 1a and 1b is added is given by the following equation (2). And can be expressed by equation (3). Here, x (p) (m) indicates the transmission signal matrix in the m-th STBC block in the p-th transmission device 1. p is a natural number.
Figure JPOXMLDOC01-appb-M000002
Figure JPOXMLDOC01-appb-M000002
Figure JPOXMLDOC01-appb-M000003
Figure JPOXMLDOC01-appb-M000003
　また、ａ（ｐ）（ｋ）は、ｐ番目の送信装置１におけるｋ回目の連送における重み付け係数を示し、以下の式（４）で表すことができる。式（４）において、ｋは自然数であり、ｊは虚数単位を表す。ｂ（ｐ）およびｃ（ｐ）は、送信装置１ごとに異なる位相回転量および振幅値を与える係数を示す。このとき、重み付け係数ａ（ｐ）（ｋ），ｂ（ｐ）およびｃ（ｐ）は以下の条件を満たす値とする。 Further, a (p) and (k) indicate the weighting coefficient in the kth continuous transmission in the p-th transmitting device 1, and can be expressed by the following equation (4). In equation (4), k is a natural number and j is an imaginary unit. b (p) and c (p) indicate a coefficient that gives a different phase rotation amount and amplitude value for each transmission device 1. At this time, the weighting coefficients a (p) (k), b (p) and c (p) are values that satisfy the following conditions.
Figure JPOXMLDOC01-appb-M000004
Figure JPOXMLDOC01-appb-M000004
　ここで、ｂ（１）≠ｂ（２）≠…≠ｂ（Ｐ）とし、ａ（ｐ）（太字）＝［ａ（ｐ）（０）　ａ（ｐ）（１）　…　ａ（ｐ）（Ｋ）］としたとき、ａ（１）（太字）、ａ（２）（太字）、…、ａ（Ｐ）（太字）はお互いに直交する。 Here, b (1) ≠ b (2) ≠ ... ≠ b (P), and a (p) (bold) = [a (p) (0) a (p) (1) ... a (p) ( When K)] is set, a (1) (bold), a (2) (bold), ..., A (P) (bold) are orthogonal to each other.
　なお、本実施の形態では、ｂ（１）＝１、ｂ（２）＝２、ｃ（１）＝ｃ（２）＝１とする。このように、本実施の形態では、送信装置１ごとに異なる重み付け係数をブロック単位でブロック符号化信号に対して付加し、これを連送回数の数だけ繰り返す。 In the present embodiment, b (1) = 1, b (2) = 2, c (1) = c (2) = 1. As described above, in the present embodiment, a different weighting coefficient is added to the block coded signal in block units for each transmission device 1, and this is repeated for the number of times of continuous transmission.
　次に、実施の形態１における受信装置２ａにおける復号処理を説明する。なお、説明の簡素化のため、図１に示したように受信アンテナ２０の本数が１の例について説明する。図３は、実施の形態１に係る受信装置２ａの処理手順の一例を示すフローチャートである。なお、各処理の詳細については後述する。 Next, the decoding process in the receiving device 2a according to the first embodiment will be described. For the sake of simplification of the description, an example in which the number of receiving antennas 20 is 1 will be described as shown in FIG. FIG. 3 is a flowchart showing an example of the processing procedure of the receiving device 2a according to the first embodiment. The details of each process will be described later.
　送信アンテナ出力電力検出部２１ａ～２１ｄは、受信アンテナ２０で受信された受信信号を用いて、対応する送信アンテナ１２ａ～１２ｄから送出された送信信号が受信アンテナ２０で受信されたときの受信電力を算出する（ステップＳ２０１）。 The transmission antenna output power detection units 21a to 21d use the reception signal received by the reception antenna 20 to obtain the reception power when the transmission signal transmitted from the corresponding transmission antennas 12a to 12d is received by the reception antenna 20. Calculate (step S201).
　連送ブロック電力検出部２２ａ，２２ｂは、受信アンテナ２０で受信された受信信号を用いて、送信装置１ａ，１ｂから送出される送信信号の連送回数ごと、すなわち連送単位での受信電力を算出する（ステップＳ２０２）。 The continuous transmission block power detection units 22a and 22b use the received signal received by the receiving antenna 20 to obtain the received power for each continuous transmission number of the transmission signals transmitted from the transmission devices 1a and 1b, that is, in the continuous transmission unit. Calculate (step S202).
　ブロック復号単位選択部２３は、送信アンテナ出力電力検出部２１ａ～２１ｄおよび連送ブロック電力検出部２２ａ，２２ｂで算出された受信電力に基づいて、ブロック復号を行う単位、すなわちブロック復号単位を選択する（ステップＳ２０３）。 The block decoding unit selection unit 23 selects a unit for performing block decoding, that is, a block decoding unit, based on the received power calculated by the transmission antenna output power detection units 21a to 21d and the continuous transmission block power detection units 22a and 22b. (Step S203).
　ブロック復号単位選択部２３は、ブロック復号単位として部分復号を選択した場合（ステップＳ２０３：部分復号）、部分復号部２４ａ，２４ｂへ受信電力および受信信号を出力する。部分復号部２４ａ，２４ｂは、連送区間のうち一部の受信信号を用いて、具体的には、１回目または２回目の連送で受信された受信信号を用いて、ブロック復号、すなわちＳＴＢＣ復号を行う（ステップＳ２０４）。連送合成部２６は、部分復号部２４ａ，２４ｂから出力された復号結果を用いて、連送合成結果を算出する（ステップＳ２０５）。連送合成部２６は、送信アンテナ出力電力検出部２１ａ～２１ｄまたは連送ブロック電力検出部２２ａ，２２ｂで算出された受信電力に基づいて、部分復号部２４ａ，２５ｂから出力された復号結果を選択または合成し、連送合成結果を出力する。 When partial decoding is selected as the block decoding unit (step S203: partial decoding), the block decoding unit selection unit 23 outputs the received power and the received signal to the partial decoding units 24a and 24b. The partial decoding units 24a and 24b block decode, that is, STBC, using a part of the received signals in the continuous transmission section, specifically, using the received signals received in the first or second continuous transmission. Decryption is performed (step S204). The continuous feed synthesis unit 26 calculates the continuous feed synthesis result using the decoding results output from the partial decoding units 24a and 24b (step S205). The continuous transmission synthesis unit 26 selects the decoding result output from the partial decoding units 24a and 25b based on the received power calculated by the transmission antenna output power detection units 21a to 21d or the continuous transmission block power detection units 22a and 22b. Alternatively, it is synthesized and the continuous feed synthesis result is output.
　ブロック復号単位選択部２３は、ブロック復号単位として全体復号を選択した場合（ステップＳ２０３：全体復号）、全体復号部２５へ受信電力および受信信号を出力する。全体復号部２５は、連送区間における全ての受信信号を用いて、具体的には、１回目および２回目の連送で受信された受信信号を用いて、ブロック復号、すなわちＳＴＢＣ復号を行う（ステップＳ２０６）。 When the block decoding unit selection unit 23 selects total decoding as the block decoding unit (step S203: total decoding), the block decoding unit selection unit 23 outputs the received power and the received signal to the total decoding unit 25. The overall decoding unit 25 performs block decoding, that is, STBC decoding, using all the received signals in the continuous transmission section, specifically, using the received signals received in the first and second continuous transmissions ( Step S206).
　次に、受信装置２ａの動作について詳細に説明する。受信アンテナ２０で受信されたｍ番目のＳＴＢＣブロックにおける受信信号をｒ（ｍ）（太字）とすると、式（１）から式（３）より、以下の式（５）で表すことができる。ここで、ｒ（ｍ，ｋ，ｎ）はｍ番目のＳＴＢＣブロックのｋ回目の連送におけるｎ番目のシンボルを表す。なお、説明の簡略化のため、受信信号に含まれる雑音成分は省略する。式（５）に示すように、送信装置１ａからの送信信号と送信装置１ｂからの送信信号とが同位相で受信された場合、すなわち、ｈ（１，１）＝ｈ（１，２）＝ｈ（２，１）＝ｈ（２，２）の場合、１回目の連送で受信された信号ｒ（ｍ，１，１）およびｒ（ｍ，１，２）は送信装置１間で送信信号が相殺される。一方で、２回目の連送で受信された信号ｒ（ｍ，２，１）およびｒ（ｍ，２，２）は、受信装置２ａにおいて２倍の受信電力で受信される。同様に、送信装置１ａからの送信信号と送信装置１ｂからの送信信号とが逆位相で受信された場合、受信装置２ａでは、１回目の連送において２倍の受信電力で信号が受信される。このように、同一信号を送信する複数の送信装置１間でビート干渉が生じる場合でも、送信装置１ごとに異なる重み付け係数を付加して連送された送信信号を生成することによって、受信装置２ａは、確実に信号を受信することが可能となる。 Next, the operation of the receiving device 2a will be described in detail. Assuming that the received signal in the m-th STBC block received by the receiving antenna 20 is r (m) (bold), it can be expressed by the following equation (5) from equations (1) to (3). Here, r (m, k, n) represents the nth symbol in the kth continuous transmission of the mth STBC block. For the sake of simplification of the description, the noise component included in the received signal is omitted. As shown in the equation (5), when the transmission signal from the transmission device 1a and the transmission signal from the transmission device 1b are received in the same phase, that is, h (1,1) = h (1,2) = When h (2,1) = h (2,2) , the signals r (m, 1, 1) and r (m, 1, 2) received in the first continuous transmission are transmitted between the transmission devices 1. The signals are offset. On the other hand, the signals r (m, 2, 1) and r (m, 2, 2) received in the second continuous transmission are received by the receiving device 2a with twice the received power. Similarly, when the transmission signal from the transmission device 1a and the transmission signal from the transmission device 1b are received in opposite phases, the reception device 2a receives the signal with twice the received power in the first continuous transmission. .. In this way, even when beat interference occurs between a plurality of transmitting devices 1 that transmit the same signal, the receiving device 2a is generated by adding a different weighting coefficient to each transmitting device 1 and continuously transmitting the transmission signal. Can reliably receive the signal.
Figure JPOXMLDOC01-appb-M000005
Figure JPOXMLDOC01-appb-M000005
　次に、送信アンテナ出力電力検出部２１ａ～２１ｄは、式（５）で表される受信信号行列ｒ（ｍ）（太字）を用いて、各送信アンテナ１２から送出された送信信号の受信電力を算出する。ｍ番目のＳＴＢＣブロックにおける各送信アンテナ１２からの受信電力は、以下の式（６）で表される信号系列ｘ（ｍ）を用いて以下の式（７）で表すことができる。このように、重み付け連送信号生成部１１ａ，１１ｂは、送信装置１ごとに異なり、またそれぞれが直交する重み付け係数をブロック符号化信号に対して付加する。これにより、受信装置２ａの送信アンテナ出力電力検出部２１ａ～２１ｄは、各送信アンテナ１２から送出された送信信号の受信電力の算出が可能となる。また、各送信アンテナ１２における稼働状況が観測可能となり、メンテナンス作業が簡便化するという効果を奏する。 Next, the transmission antenna output power detection units 21a to 21d use the reception signal matrix r (m) (bold) represented by the equation (5) to obtain the reception power of the transmission signal transmitted from each transmission antenna 12. calculate. The received power from each transmitting antenna 12 in the m-th STBC block can be expressed by the following equation (7) using the signal sequence x (m) represented by the following equation (6). In this way, the weighted continuous transmission signal generation units 11a and 11b add weighting coefficients that are different for each transmission device 1 and that are orthogonal to each other to the block coded signal. As a result, the transmission antenna output power detection units 21a to 21d of the reception device 2a can calculate the reception power of the transmission signal transmitted from each transmission antenna 12. In addition, the operating status of each transmitting antenna 12 can be observed, which has the effect of simplifying maintenance work.
Figure JPOXMLDOC01-appb-M000006
Figure JPOXMLDOC01-appb-M000006
Figure JPOXMLDOC01-appb-M000007
Figure JPOXMLDOC01-appb-M000007
　連送ブロック電力検出部２２ａ，２２ｂは、式（５）で表される受信信号行列ｒ（ｍ）（太字）のうち、連送１回目または２回目に受信された受信信号を用いて、それぞれの連送回数における受信電力を算出する。 The continuous transmission block power detection units 22a and 22b use the received signals received for the first or second continuous transmission in the received signal matrix r (m) (bold) represented by the equation (5), respectively. Calculate the received power for the number of consecutive transmissions.
　次に、ブロック復号単位選択部２３は、送信アンテナ出力電力検出部２１ａ～２１ｄおよび連送ブロック電力検出部２２ａ，２２ｂで算出された受信電力に基づいて、ブロック復号単位を選択する。ブロック復号単位選択部２３は、例えば、式（７）に示す各送信アンテナ１２からの受信電力において、送信装置１ａから送出された送信信号の受信電力が低い場合は全体復号部２５を選択し、連送区間において送信装置１ｂから送出された送信信号に対応する全ての受信信号を用いてブロック復号してもよい。また、ブロック復号単位選択部２３は、連送ブロック電力検出部２２ａにおいて算出された連送１回目の受信電力が低い場合、連送２回目の受信信号のみを用いてブロック復号を行う部分復号部２４ｂを選択してもよい。なお、ブロック復号単位選択部２３は、部分復号部２４ａ，２４ｂのうち１つを選択する必要はなく、複数または全ての部分復号部２４ａ，２４ｂを選択してもよい。 Next, the block decoding unit selection unit 23 selects the block decoding unit based on the received power calculated by the transmission antenna output power detection units 21a to 21d and the continuous transmission block power detection units 22a and 22b. For example, when the reception power of the transmission signal transmitted from the transmission device 1a is low in the reception power from each transmission antenna 12 represented by the equation (7), the block decoding unit selection unit 23 selects the overall decoding unit 25. Block decoding may be performed using all the received signals corresponding to the transmitted signals transmitted from the transmitting device 1b in the continuous transmission section. Further, the block decoding unit selection unit 23 is a partial decoding unit that performs block decoding using only the received signal of the second continuous transmission when the reception power of the first continuous transmission calculated by the continuous transmission block power detection unit 22a is low. 24b may be selected. The block decoding unit selection unit 23 does not need to select one of the partial decoding units 24a and 24b, and may select a plurality or all of the partial decoding units 24a and 24b.
　なお、ブロック復号単位選択部２３は、本実施の形態では、送信アンテナ出力電力検出部２１ａ～２１ｄおよび連送ブロック電力検出部２２ａ，２２ｂで算出された受信電力に基づいてブロック復号単位を選択するが、これに限定されない。ブロック復号単位選択部２３は、図１に図示しない伝送路推定部において算出された伝送路推定値などの連送区間の伝搬路状況に基づいて、ブロック復号単位を選択してもよい。ブロック復号単位選択部２３は、例えば、ブロックごとの伝搬路変動が大きい場合、伝搬路変動による影響を低減するために部分復号部２４ａ，２４ｂを選択してもよい。ブロック復号単位選択部２３は、受信電力および伝搬路状況のうち少なくとも１つに基づいて、ブロック復号単位を選択する。 In the present embodiment, the block decoding unit selection unit 23 selects the block decoding unit based on the received power calculated by the transmission antenna output power detection units 21a to 21d and the continuous transmission block power detection units 22a and 22b. However, it is not limited to this. The block decoding unit selection unit 23 may select the block decoding unit based on the propagation path condition of the continuous transmission section such as the transmission line estimated value calculated by the transmission line estimation unit (not shown in FIG. 1). For example, when the propagation path variation for each block is large, the block decoding unit selection unit 23 may select the partial decoding units 24a and 24b in order to reduce the influence of the propagation path variation. The block decoding unit selection unit 23 selects a block decoding unit based on at least one of the received power and the propagation path condition.
　例えば、ブロック復号単位選択部２３は、送信アンテナ出力電力検出部２１ａ～２１ｄで算出された受信電力に基づいて、各受信電力が規定された第１の範囲内にない場合、受信電力の大きい受信信号を用いてブロック復号を行う部分復号部２４ａ，２４ｂを選択する。ブロック復号単位選択部２３は、各受信電力が第１の範囲内の場合、全ての受信信号を用いてブロック復号を行う全体復号部２５を選択する。 For example, the block decoding unit selection unit 23 receives a large reception power when each reception power is not within the specified first range based on the reception power calculated by the transmission antenna output power detection units 21a to 21d. Partial decoding units 24a and 24b that perform block decoding using signals are selected. When each received power is within the first range, the block decoding unit selection unit 23 selects the overall decoding unit 25 that performs block decoding using all the received signals.
　または、ブロック復号単位選択部２３は、連送ブロック電力検出部２２ａ，２２ｂで算出された受信電力に基づいて、連送区間における各受信電力が規定された第２の範囲内にない場合、連送区間において受信電力の大きい１つまたは複数の受信タイミングの受信信号を用いてブロック復号を行う部分復号部２４ａ，２４ｂを選択する。ブロック復号単位選択部２３は、連送区間における各受信電力が第２の範囲内の場合、連送区間の全ての受信タイミングの受信信号を用いてブロック復号を行う全体復号部２５を選択する。 Alternatively, if the block decoding unit selection unit 23 is not within the specified second range of each received power in the continuous transmission section based on the reception power calculated by the continuous transmission block power detection units 22a and 22b, the block decoding unit selection unit 23 is continuously transmitted. Partial decoding units 24a and 24b that perform block decoding using one or more reception signals having a large reception power in the transmission section are selected. When each received power in the continuous transmission section is within the second range, the block decoding unit selection unit 23 selects the overall decoding unit 25 that performs block decoding using the reception signals of all the reception timings in the continuous transmission section.
　または、ブロック復号単位選択部２３は、伝搬路状況に基づいて、連送区間における伝搬路状況の変動が規定された第３の範囲内にない場合、連送区間において伝搬路状況の変動が小さい１つまたは複数の受信信号を用いてブロック復号を行う部分復号部２４ａ，２４ｂを選択する。ブロック復号単位選択部２３は、連送区間における伝搬路状況の変動が第３の範囲内の場合、連送区間の全ての受信信号を用いてブロック復号を行う全体復号部２５を選択する。 Alternatively, when the block decoding unit selection unit 23 is not within the third range in which the fluctuation of the propagation path condition in the continuous transmission section is defined based on the propagation path condition, the fluctuation of the propagation path condition in the continuous transmission section is small. Partial decoding units 24a and 24b that perform block decoding using one or more received signals are selected. The block decoding unit selection unit 23 selects the overall decoding unit 25 that performs block decoding using all the received signals in the continuous transmission section when the fluctuation of the propagation path condition in the continuous transmission section is within the third range.
　次に、部分復号部２４ａ，２４ｂは、連送１回目および２回目に受信された受信信号を用いて、以下の式（８）から式（１１）で示すブロック復号を行う。なお、図１に示す受信装置２ａは２つの部分復号部２４ａ，２４ｂを備えているが、これに限定されない。受信装置２ａは、１つの部分復号部２４で各連送回数におけるブロック復号を逐次的に行ってもよい。また、受信装置２ａは、連送１回目の２シンボル目に受信された受信信号と連送２回目の１シンボル目に受信された受信信号とを用いてブロック復号を行う部分復号部２４を備えてもよい。また、受信装置２ａは、連送回数が３回以上の場合は３個以上の部分復号部２４を備え、それぞれの連送回数における受信信号を用いたブロック復号を行い、また複数の連送回数における受信信号を用いてブロック復号を行ってもよい。 Next, the partial decoding units 24a and 24b perform block decoding represented by the following equations (8) to (11) using the received signals received at the first and second continuous transmissions. The receiving device 2a shown in FIG. 1 includes two partial decoding units 24a and 24b, but is not limited thereto. The receiving device 2a may sequentially perform block decoding at each continuous transmission number by one partial decoding unit 24. Further, the receiving device 2a includes a partial decoding unit 24 that performs block decoding using the received signal received at the second symbol of the first continuous transmission and the received signal received at the first symbol of the second continuous transmission. You may. Further, the receiving device 2a includes three or more partial decoding units 24 when the number of continuous transmissions is three or more, performs block decoding using the received signal at each continuous transmission number, and also performs block decoding using the received signal at each continuous transmission number. Block decoding may be performed using the received signal in.
Figure JPOXMLDOC01-appb-M000008
Figure JPOXMLDOC01-appb-M000008
Figure JPOXMLDOC01-appb-M000009
Figure JPOXMLDOC01-appb-M000009
Figure JPOXMLDOC01-appb-M000010
Figure JPOXMLDOC01-appb-M000010
Figure JPOXMLDOC01-appb-M000011
Figure JPOXMLDOC01-appb-M000011
　次に、全体復号部２５は、ｍ番目のＳＴＢＣブロックにおける全ての連送回数での受信信号を用いて、以下の式（１２）および式（１３）で示すブロック復号を行う。 Next, the overall decoding unit 25 performs block decoding represented by the following equations (12) and (13) using the received signals at all the continuous transmission times in the m-th STBC block.
Figure JPOXMLDOC01-appb-M000012
Figure JPOXMLDOC01-appb-M000012
Figure JPOXMLDOC01-appb-M000013
Figure JPOXMLDOC01-appb-M000013
　式（８）から式（１１）で示す部分復号部２４ａ，２４ｂにおけるブロック復号結果と、式（１２）および式（１３）で示す全体復号部２５におけるブロック復号結果とを比較すると、連送された信号のうち一部の受信信号を用いてブロック復号する部分復号部２４ａ，２４ｂは、送信装置１ａ，１ｂのチャネル利得が合成されたダイバーシチ利得しか得ることができない。一方で、全体復号部２５は、通信システム３が備える４本全ての送信アンテナ１２におけるチャネル利得がダイバーシチ利得として得ることができる。すなわち、ダイバーシチ利得の観点で比較すると、全体復号部２５のほうが良好となる。しかしながら、全体復号部２５では連送区間全てのチャネルを用いてブロック復号しているのに対し、部分復号部２４ａ，２４ｂでは各送信回数におけるチャネルのみを用いてブロック復号を行う。一般に、ブロック復号では復号に用いるブロック内のチャネル変動が一定であると仮定して復号するため、ブロック内のチャネル変動が大きくなるほど復号利得が減少する。そのため、連送区間におけるチャネル変動が大きい場合には、より多くのシンボルを用いてブロック復号を行う全体復号部２５では復号特性が劣化する。以上のことから、受信装置２ａは、ビート干渉による受信電力、各送信アンテナ１２におけるチャネル変動などに応じてブロック復号単位を選択することにより、ビート干渉による影響を低減するだけでなく、最適な復号特性を獲得可能とする。 Comparing the block decoding results of the partial decoding units 24a and 24b represented by the equations (8) to (11) with the block decoding results of the total decoding units 25 represented by the equations (12) and (13), they are continuously transmitted. The partial decoding units 24a and 24b that block-decode using a part of the received signals can obtain only the diversity gain in which the channel gains of the transmitting devices 1a and 1b are combined. On the other hand, the overall decoding unit 25 can obtain the channel gains of all four transmitting antennas 12 included in the communication system 3 as diversity gains. That is, when compared from the viewpoint of diversity gain, the overall decoding unit 25 is better. However, while the total decoding unit 25 performs block decoding using all channels in the continuous transmission section, the partial decoding units 24a and 24b perform block decoding using only the channels at each transmission number. Generally, in block decoding, decoding is performed on the assumption that the channel variation in the block used for decoding is constant, so that the decoding gain decreases as the channel variation in the block increases. Therefore, when the channel variation in the continuous feed section is large, the decoding characteristics of the overall decoding unit 25 that performs block decoding using more symbols deteriorates. From the above, the receiving device 2a not only reduces the influence of beat interference but also optimally decodes by selecting the block decoding unit according to the received power due to beat interference, the channel variation in each transmitting antenna 12, and the like. Make it possible to acquire characteristics.
　次に、連送合成部２６は、部分復号部２４ａ，２４ｂから出力された連送１回目および２回目におけるブロック復号結果を比較し、各変調信号における復号利得が良好な方を連送合成結果として選択し、出力する。なお、連送合成部２６は、送信アンテナ出力電力検出部２１ａ～２１ｄおよび連送ブロック電力検出部２２ａ，２２ｂで算出された受信電力に基づいて、部分復号部２４ａ，２４ｂにおける復号結果を重み付け合成し、連送合成結果として出力してもよい。 Next, the continuous feed synthesis unit 26 compares the block decoding results of the first and second continuous feeds output from the partial decoding units 24a and 24b, and the one with the better decoding gain in each modulation signal is the continuous feed synthesis result. Select as and output. The continuous transmission synthesis unit 26 weights and synthesizes the decoding results of the partial decoding units 24a and 24b based on the received power calculated by the transmission antenna output power detection units 21a to 21d and the continuous transmission block power detection units 22a and 22b. However, it may be output as a continuous feed synthesis result.
　また、式（２）、式（３）、式（５）、および式（６）では、ｍ番目のＳＴＢＣブロックにおける連送信号は時間的に連続して送受信されるものとしたが、連送１回目のブロック符号化信号行列を複数ブロックに渡って送受信した後、連送２回目のブロック符号化信号行列を送受信してもよい。なお、上記のような場合、送信アンテナ出力電力検出部２１ａ～２１ｄ、連送ブロック電力検出部２２ａ，２２ｂ、ブロック復号単位選択部２３、部分復号部２４ａ，２４ｂ、全体復号部２５、および連送合成部２６は、ブロック番号ｍに応じた受信信号を用いて動作する。 Further, in the equations (2), (3), (5), and (6), the continuous transmission signal in the m-th STBC block is assumed to be continuously transmitted and received in time, but the continuous transmission is performed. After the first block-encoded signal matrix is transmitted and received over a plurality of blocks, the second block-encoded signal matrix may be transmitted and received. In the above case, the transmission antenna output power detection units 21a to 21d, the continuous transmission block power detection units 22a and 22b, the block decoding unit selection unit 23, the partial decoding units 24a and 24b, the overall decoding unit 25, and the continuous transmission unit. The synthesis unit 26 operates by using the received signal corresponding to the block number m.
　本実施の形態では、Ａｌａｍｏｕｔｉ符号化を適用することを前提として説明したが、これに限定されない。通信システム３は、符号化として、複数のシンボルを単位として符号化するブロック符号化であればその他の符号化も適用可能である。 In the present embodiment, the description has been made on the premise that Alamouti coding is applied, but the present embodiment is not limited to this. As the coding of the communication system 3, other coding can be applied as long as it is a block coding in which a plurality of symbols are coded as a unit.
　次に、送信装置１および受信装置２ａのハードウェア構成について説明する。送信装置１において、送信アンテナ１２はアンテナ装置により実現される。ブロック符号化部１０および重み付け連送信号生成部１１は処理回路により実現される。また、受信装置２ａにおいて、受信アンテナ２０はアンテナ装置により実現される。送信アンテナ出力電力検出部２１、連送ブロック電力検出部２２、ブロック復号単位選択部２３、部分復号部２４、全体復号部２５、および連送合成部２６は処理回路により実現される。処理回路は、メモリに格納されるプログラムを実行するプロセッサおよびメモリであってもよいし、専用のハードウェアであってもよい。処理回路は制御回路とも呼ばれる。 Next, the hardware configuration of the transmitting device 1 and the receiving device 2a will be described. In the transmitting device 1, the transmitting antenna 12 is realized by the antenna device. The block coding unit 10 and the weighted continuous signal generation unit 11 are realized by a processing circuit. Further, in the receiving device 2a, the receiving antenna 20 is realized by the antenna device. The transmission antenna output power detection unit 21, the continuous transmission block power detection unit 22, the block decoding unit selection unit 23, the partial decoding unit 24, the total decoding unit 25, and the continuous transmission synthesis unit 26 are realized by a processing circuit. The processing circuit may be a processor and memory for executing a program stored in the memory, or may be dedicated hardware. The processing circuit is also called a control circuit.
　図４は、実施の形態１に係る送信装置１および受信装置２ａが備える処理回路をプロセッサおよびメモリで実現する場合の処理回路の構成例を示す図である。図４に示す処理回路３００は制御回路であり、プロセッサ３００ａおよびメモリ３００ｂを備える。処理回路がプロセッサ３００ａおよびメモリ３００ｂで構成される場合、処理回路の各機能は、ソフトウェア、ファームウェア、またはソフトウェアとファームウェアとの組み合わせにより実現される。ソフトウェアまたはファームウェアはプログラムとして記述され、メモリ３００ｂに格納される。処理回路では、メモリ３００ｂに記憶されたプログラムをプロセッサ３００ａが読み出して実行することにより、各機能を実現する。すなわち、処理回路は、送信装置１においてはブロック符号化部１０および重み付け連送信号生成部１１の処理が結果的に実行されることになるプログラムを格納するためのメモリ３００ｂを備える。または、処理回路は、受信装置２ａにおいては送信アンテナ出力電力検出部２１、連送ブロック電力検出部２２、ブロック復号単位選択部２３、部分復号部２４、全体復号部２５、および連送合成部２６の処理が結果的に実行されることになるプログラムを格納するためのメモリ３００ｂを備える。このプログラムは、処理回路により実現される各機能を送信装置１または受信装置２ａに実行させるためのプログラムであるともいえる。このプログラムは、プログラムが記憶された記憶媒体により提供されてもよいし、通信媒体など他の手段により提供されてもよい。 FIG. 4 is a diagram showing a configuration example of a processing circuit when the processing circuit included in the transmitting device 1 and the receiving device 2a according to the first embodiment is realized by a processor and a memory. The processing circuit 300 shown in FIG. 4 is a control circuit and includes a processor 300a and a memory 300b. When the processing circuit is composed of the processor 300a and the memory 300b, each function of the processing circuit is realized by software, firmware, or a combination of software and firmware. The software or firmware is written as a program and stored in the memory 300b. In the processing circuit, each function is realized by the processor 300a reading and executing the program stored in the memory 300b. That is, the processing circuit includes a memory 300b for storing a program in which the processing of the block coding unit 10 and the weighted continuous signal generation unit 11 is eventually executed in the transmission device 1. Alternatively, in the receiving device 2a, the processing circuit includes a transmitting antenna output power detection unit 21, a continuous transmission block power detection unit 22, a block decoding unit selection unit 23, a partial decoding unit 24, an overall decoding unit 25, and a continuous transmission synthesis unit 26. A memory 300b for storing a program for which the processing of the above is to be executed as a result is provided. It can be said that this program is a program for causing the transmitting device 1 or the receiving device 2a to execute each function realized by the processing circuit. This program may be provided by a storage medium in which the program is stored, or may be provided by other means such as a communication medium.
　送信装置１において、上記プログラムである第１のプログラムは、ブロック符号化部１０が、変調信号に対してブロック符号化を行い、２本以上の送信アンテナ１２の各々から送信される送信信号を生成するブロック符号化ステップと、重み付け連送信号生成部１１が、ブロック符号化部１０によるブロック符号化の単位をブロックとし、送信信号に対して、送信装置１ごとに異なる重み付け係数をブロック単位で付加する処理を、送信信号を複数回送信する連送回数の数だけ繰り返し実施する重み付け連送信号生成ステップと、を送信装置１に実行させるプログラムであるとも言える。 In the transmission device 1, in the first program, which is the above program, the block coding unit 10 performs block coding on the modulated signal and generates a transmission signal transmitted from each of the two or more transmission antennas 12. The block coding step to be performed and the weighted continuous transmission signal generation unit 11 use the block coding unit by the block coding unit 10 as a block, and add a different weighting coefficient to the transmission signal for each block unit. It can be said that this is a program for causing the transmission device 1 to execute a weighted continuous transmission signal generation step of repeating the processing for the number of consecutive transmissions for transmitting the transmission signal a plurality of times.
　また、受信装置２ａにおいて、上記プログラムである第２のプログラムは、送信アンテナ出力電力検出部２１が、受信信号を用いて、送信装置１が備える２本以上の送信アンテナ１２から送出された各々の送信信号ごとの受信電力を算出する送信アンテナ出力電力検出ステップと、連送ブロック電力検出部２２が、受信信号を用いて、送信装置１においてブロック符号化され送信装置１から送出された送信信号について、ブロック符号化のブロック単位で連送回数ごとの受信電力を算出する連送ブロック電力検出ステップと、を受信装置２ａに実行させるプログラムであるとも言える。また、第２のプログラムは、ブロック復号単位選択部２３が、受信電力、および複数の送信信号である連送信号が送信装置から受信装置に送信される区間である連送区間の伝搬路状況のうち少なくとも１つに基づいて、ブロック復号単位を選択するブロック復号単位選択ステップと、部分復号部２４が、連送されたブロック符号化信号の受信信号のうち一部の受信信号を用いてブロック復号を行う部分復号ステップと、全体復号部２５が、連送されたブロック符号化信号の受信信号のうち全ての受信信号を用いてブロック復号を行う全体復号ステップと、連送合成部２６が、部分復号部２４で部分復号された復号結果を用いて連送合成結果を算出する連送合成ステップと、を受信装置２ａに実行させるプログラムであるとも言える。 Further, in the receiving device 2a, in the second program, which is the above program, the transmitting antenna output power detection unit 21 uses the received signal to transmit each of the two or more transmitting antennas 12 included in the transmitting device 1. Regarding the transmission antenna output power detection step for calculating the reception power for each transmission signal, and the transmission signal that the continuous transmission block power detection unit 22 is block-encoded in the transmission device 1 using the reception signal and transmitted from the transmission device 1. It can also be said that this is a program for causing the receiving device 2a to execute the continuous transmission block power detection step of calculating the received power for each continuous transmission in the block-encoded block unit. Further, in the second program, the block decoding unit selection unit 23 determines the received power and the propagation path condition of the continuous transmission section in which the continuous transmission signal which is a plurality of transmission signals is transmitted from the transmission device to the reception device. A block decoding unit selection step of selecting a block decoding unit based on at least one of them, and a partial decoding unit 24 block decoding using a part of the received signals of the continuously transmitted block coded signals. The partial decoding step of performing block decoding by the total decoding unit 25 using all the received signals of the continuously transmitted block-encoded signals, and the partial decoding unit 26 of the continuous transmission synthesis unit 26 It can be said that this is a program for causing the receiving device 2a to execute the continuous transmission synthesis step of calculating the continuous transmission synthesis result using the decoding result partially decoded by the decoding unit 24.
　ここで、プロセッサ３００ａは、例えば、ＣＰＵ（Central　Processing　Unit）、処理装置、演算装置、マイクロプロセッサ、マイクロコンピュータ、またはＤＳＰ（Digital　Signal　Processor）などである。また、メモリ３００ｂは、例えば、ＲＡＭ（Random　Access　Memory）、ＲＯＭ（Read　Only　Memory）、フラッシュメモリ、ＥＰＲＯＭ（Erasable　Programmable　ＲＯＭ）、ＥＥＰＲＯＭ（登録商標）（Electrically　ＥＰＲＯＭ）などの、不揮発性または揮発性の半導体メモリ、磁気ディスク、フレキシブルディスク、光ディスク、コンパクトディスク、ミニディスク、またはＤＶＤ（Digital　Versatile　Disc）などが該当する。 Here, the processor 300a is, for example, a CPU (Central Processing Unit), a processing device, an arithmetic unit, a microprocessor, a microcomputer, a DSP (Digital Signal Processor), or the like. The memory 300b is, for example, non-volatile or volatile such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable ROM), and EPROM (registered trademark) (Electrically EPROM). This includes semiconductor memories, magnetic disks, flexible disks, optical disks, compact disks, mini disks, DVDs (Digital Versatile Disc), and the like.
　図５は、実施の形態１に係る送信装置１および受信装置２ａが備える処理回路を専用のハードウェアで構成する場合の処理回路の例を示す図である。図５に示す処理回路３００ｃは、例えば、単一回路、複合回路、プログラム化したプロセッサ、並列プログラム化したプロセッサ、ＡＳＩＣ（Application　Specific　Integrated　Circuit）、ＦＰＧＡ（Field　Programmable　Gate　Array）、またはこれらを組み合わせたものが該当する。処理回路については、一部を専用のハードウェアで実現し、一部をソフトウェアまたはファームウェアで実現するようにしてもよい。このように、処理回路は、専用のハードウェア、ソフトウェア、ファームウェア、またはこれらの組み合わせによって、上述の各機能を実現することができる。 FIG. 5 is a diagram showing an example of a processing circuit in the case where the processing circuit included in the transmitting device 1 and the receiving device 2a according to the first embodiment is configured by dedicated hardware. The processing circuit 300c shown in FIG. 5 is, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or a combination thereof. The thing is applicable. As for the processing circuit, a part may be realized by dedicated hardware and a part may be realized by software or firmware. As described above, the processing circuit can realize each of the above-mentioned functions by the dedicated hardware, software, firmware, or a combination thereof.
　以上説明したように、本実施の形態によれば、送信装置１ａ，１ｂは、一次変調された複数のシンボルをブロック符号化し、連送回数の数だけブロック符号化信号に対し送信装置１ごとに異なる重み付け係数を付加する動作を繰り返す。受信装置２ａは、送信アンテナ１２または連送回数ごとの受信電力を測定し、受信電力に基づいて選択された単位でブロック復号し、復号結果を連送合成する。送信装置１ａ，１ｂにおいて、連送回数の数だけ、送信装置１ごとに異なり、かつ互いに直交する重み付け係数をブロック符号化信号に対して付加することによって、受信装置２ａは、同一の信号を同時刻で送信する複数の送信装置１間でビート干渉が生じる場合においても、確実に信号を受信することができる。 As described above, according to the present embodiment, the transmission devices 1a and 1b block-encode a plurality of primary-modulated symbols, and for each transmission device 1 with respect to the block-coded signal as many times as the number of continuous transmissions. The operation of adding different weighting coefficients is repeated. The receiving device 2a measures the received power for each transmission antenna 12 or the number of continuous transmissions, blocks-decodes the blocks in units selected based on the received power, and continuously synthesizes the decoding results. In the transmitting devices 1a and 1b, the same signal is transmitted by the receiving device 2a by adding weighting coefficients that are different for each transmitting device 1 and orthogonal to each other to the block coded signal by the number of times of continuous transmission. Even when beat interference occurs between a plurality of transmitting devices 1 that transmit at time, the signal can be reliably received.
実施の形態２．
　実施の形態１では、重み付け連送信号生成部１１ａ，１１ｂにおいて付加する重み付け係数を固定としていた。実施の形態２では、受信装置での受信電力に基づいて、各送信装置１における重み付け係数を適応的に変更する。実施の形態１と異なる部分について説明する。 Embodiment 2.
In the first embodiment, the weighting coefficient added in the weighted continuous transmission signal generation units 11a and 11b is fixed. In the second embodiment, the weighting coefficient in each transmitting device 1 is adaptively changed based on the received power in the receiving device. A part different from the first embodiment will be described.
　図６は、実施の形態２に係る受信装置２ｂの構成例を示す図である。受信装置２ｂは、受信装置２ａに対して重み付け係数制御部２７を追加したものである。本実施の形態の通信システム３は、図１に示す受信装置２ａに対して重み付け係数制御部２７を追加で備える以外は、実施の形態１の通信システム３と同様である。 FIG. 6 is a diagram showing a configuration example of the receiving device 2b according to the second embodiment. The receiving device 2b is obtained by adding a weighting coefficient control unit 27 to the receiving device 2a. The communication system 3 of the present embodiment is the same as the communication system 3 of the first embodiment except that the weighting coefficient control unit 27 is additionally provided for the receiving device 2a shown in FIG.
　重み付け係数制御部２７の動作について詳細に説明する。重み付け係数制御部２７は、送信アンテナ出力電力検出部２１ａ～２１ｄおよび連送ブロック電力検出部２２ａ，２２ｂで算出されたそれぞれの受信電力を用いて、送信装置１ａ，１ｂにおける重み付け連送信号生成部１１ａ，１１ｂに対して重み付け係数を指示する。例えば、連送ブロック電力検出部２２ａで算出された連送１回目の受信電力が小さい場合、送信装置１ａからの信号と送信装置１ｂからの信号が互いに同位相で受信されていることを意味する。そのため、重み付け係数制御部２７は、式（２）において、重み付け連送信号生成部１１ａ，１１ｂの重み付け係数をａ（ｐ）（ｋ）＝１となるように、送信装置１ａ，１ｂに指示する。これにより、いずれの連送時間においても、受信装置２ｂは、２倍の受信電力で信号が受信され、連送合成利得がさらに増加するという効果を奏する。なお、重み付け係数制御部２７は、重み付け連送信号生成部１１ａ，１１ｂに対して重み付け係数を通知してもよいし、送信アンテナ出力電力検出部２１ａ～２１ｄおよび連送ブロック電力検出部２２ａ，２２ｂにおいて算出された受信電力を通知してもよい。また、重み付け係数制御部２７は、重み付け係数を指示するような他のパラメータを通知してもよい。 The operation of the weighting coefficient control unit 27 will be described in detail. The weighting coefficient control unit 27 uses the received powers calculated by the transmission antenna output power detection units 21a to 21d and the continuous transmission block power detection units 22a and 22b to generate weighted continuous transmission signals in the transmission devices 1a and 1b. The weighting coefficient is specified for 11a and 11b. For example, when the received power of the first continuous transmission calculated by the continuous transmission block power detection unit 22a is small, it means that the signal from the transmission device 1a and the signal from the transmission device 1b are received in the same phase. .. Therefore, the weighting coefficient control unit 27 instructs the transmission devices 1a and 1b so that the weighting coefficients of the weighted continuous transmission signal generation units 11a and 11b are a (p) (k) = 1 in the equation (2). .. As a result, the receiving device 2b has the effect that the signal is received with twice the received power at any continuous transmission time, and the continuous transmission combined gain is further increased. The weighting coefficient control unit 27 may notify the weighting continuous transmission signal generation units 11a and 11b of the weighting coefficient, and the transmission antenna output power detection units 21a to 21d and the continuous transmission block power detection units 22a and 22b. The received power calculated in the above may be notified. In addition, the weighting coefficient control unit 27 may notify other parameters that indicate the weighting coefficient.
　なお、図６では、重み付け係数制御部２７を受信装置２ｂに備え、重み付け連送信号生成部１１ａ，１１ｂに対して通知する構成としているが、これに限定されない。通信システム３では、重み付け係数制御部２７を送信装置１ａ，１ｂにそれぞれ備えてもよい。この場合、受信装置２ｂは、受信アンテナ２０で受信された受信電力、送信アンテナ出力電力検出部２１ａ～２１ｄおよび連送ブロック電力検出部２２ａ，２２ｂで算出された受信電力などを、送信装置１ａ，１ｂが備える重み付け係数制御部２７へ通知する。重み付け係数制御部２７が、重み付け連送信号生成部１１ａ，１１ｂに対して重み付け係数を指示することによって、同様の効果を奏する。 Note that, in FIG. 6, the weighting coefficient control unit 27 is provided in the receiving device 2b, and the weighted continuous transmission signal generation units 11a and 11b are notified, but the present invention is not limited to this. In the communication system 3, the weighting coefficient control unit 27 may be provided in the transmission devices 1a and 1b, respectively. In this case, the receiving device 2b transmits the received power received by the receiving antenna 20, the received power calculated by the transmitting antenna output power detecting units 21a to 21d and the continuous transmission block power detecting units 22a, 22b, and the like. Notify the weighting coefficient control unit 27 included in 1b. The weighting coefficient control unit 27 exerts the same effect by instructing the weighting continuous signal generation units 11a and 11b of the weighting coefficient.
　重み付け係数制御部２７を受信装置２ｂに備える場合、および重み付け係数制御部２７を送信装置１ａ，１ｂにそれぞれ備える場合のいずれの場合においても、受信装置２ｂは、図示しない送信機能を用いて、送信装置１ａ，１ｂとの間で通信を行うことが可能である。同様に、送信装置１ａ，１ｂは、図示しない受信機能を用いて、受信装置２ｂとの間で通信を行うことが可能である。 In both cases where the weighting coefficient control unit 27 is provided in the receiving device 2b and the weighting coefficient control unit 27 is provided in the transmitting devices 1a and 1b, respectively, the receiving device 2b uses a transmission function (not shown) to transmit. It is possible to communicate with the devices 1a and 1b. Similarly, the transmitting devices 1a and 1b can communicate with the receiving device 2b by using a receiving function (not shown).
　以上説明したように、本実施の形態によれば、受信装置２ｂは、各時刻における受信電力および受信電力によって、送信装置１に対して与える位相回転量を変更する。これにより、通信システム３では、いずれの時刻においても信号を受信可能とし、連送合成利得の向上、すなわち、伝送品質の向上を可能とする。 As described above, according to the present embodiment, the receiving device 2b changes the phase rotation amount given to the transmitting device 1 according to the received power and the received power at each time. As a result, in the communication system 3, the signal can be received at any time, and the continuous transmission combined gain can be improved, that is, the transmission quality can be improved.
　以上の実施の形態に示した構成は、本発明の内容の一例を示すものであり、別の公知の技術と組み合わせることも可能であるし、本発明の要旨を逸脱しない範囲で、構成の一部を省略、変更することも可能である。 The configuration shown in the above-described embodiment shows an example of the content of the present invention, can be combined with another known technique, and is one of the configurations without departing from the gist of the present invention. It is also possible to omit or change the part.
　１ａ，１ｂ　送信装置、２ａ，２ｂ　受信装置、３　通信システム、１０ａ，１０ｂ　ブロック符号化部、１１ａ，１１ｂ　重み付け連送信号生成部、１２ａ～１２ｄ　送信アンテナ、２０　受信アンテナ、２１ａ～２１ｄ　送信アンテナ出力電力検出部、２２ａ，２２ｂ　連送ブロック電力検出部、２３　ブロック復号単位選択部、２４ａ，２４ｂ　部分復号部、２５　全体復号部、２６　連送合成部、２７　重み付け係数制御部。 1a, 1b transmitter, 2a, 2b receiver, 3 communication system, 10a, 10b block coding unit, 11a, 11b weighted continuous signal generator, 12a-12d transmitter antenna, 20 receiver antenna, 21a-21d transmitter antenna output Power detection unit, 22a, 22b continuous transmission block power detection unit, 23 block decoding unit selection unit, 24a, 24b partial decoding unit, 25 total decoding unit, 26 continuous transmission synthesis unit, 27 weighting coefficient control unit.

Claims (21)

  1. 　２本以上の送信アンテナと、
    　変調信号に対してブロック符号化を行い、前記２本以上の送信アンテナの各々から送信される送信信号を生成するブロック符号化部と、
    　前記ブロック符号化部による前記ブロック符号化の単位をブロックとし、前記送信信号に対して、送信装置ごとに異なる重み付け係数をブロック単位で付加する処理を、前記送信信号を複数回送信する連送回数の数だけ繰り返し実施する重み付け連送信号生成部と、
    　を備えることを特徴とする送信装置。     With two or more transmitting antennas
    A block coding unit that performs block coding on the modulated signal and generates a transmission signal transmitted from each of the two or more transmission antennas.
    The block coding unit by the block coding unit is a block, and a process of adding a weighting coefficient different for each transmission device to the transmission signal in block units is performed, and the number of consecutive transmissions in which the transmission signal is transmitted a plurality of times. Weighted continuous signal generation unit that repeats as many times as
    A transmitter characterized by comprising.
  2. 　前記重み付け係数は、複数の前記送信信号である連送信号が送信される区間である連送区間において、複数の前記送信装置の間で直交し、前記送信装置の前記連送回数の間で直交する値とする、
    　ことを特徴とする請求項１に記載の送信装置。     The weighting coefficient is orthogonal between the plurality of transmission devices in the continuous transmission section which is the section in which the continuous transmission signal which is the plurality of transmission signals is transmitted, and is orthogonal between the continuous transmission times of the transmission device. To be the value to be
    The transmitting device according to claim 1.
  3. 　前記重み付け連送信号生成部は、前記送信信号に対して、前記送信信号を受信する受信装置における受信電力、および複数の前記送信信号である連送信号が送信される区間である連送区間におけるチャネル変動のうち少なくとも１つに基づいて、ビート干渉による影響が低減される前記重み付け係数を付加する処理を連送回数の数だけ繰り返し実施する、
    　ことを特徴とする請求項１または２に記載の送信装置。     The weighted continuous transmission signal generation unit is in a continuous transmission section in which the received power in the receiving device that receives the transmission signal and the continuous transmission signal that is the plurality of transmission signals are transmitted with respect to the transmission signal. Based on at least one of the channel fluctuations, the process of adding the weighting coefficient that reduces the influence of beat interference is repeated as many times as the number of continuous feeds.
    The transmitter according to claim 1 or 2.
  4. 　請求項１から３のいずれか１つに記載の送信装置によって連送されたブロック符号化信号である送信信号を受信信号として受信する受信装置であって、
    　前記送信信号を前記受信信号として受信する１本以上の受信アンテナと、
    　前記受信信号を用いて、前記送信装置が備える２本以上の送信アンテナから送出された各々の送信信号ごとの受信電力を算出する送信アンテナ出力電力検出部と、
    　前記受信信号を用いて、前記送信装置においてブロック符号化され前記送信装置から送出された送信信号について、前記ブロック符号化のブロック単位で連送回数ごとの受信電力を算出する連送ブロック電力検出部と、
    　前記受信電力、および複数の前記送信信号である連送信号が前記送信装置から前記受信装置に送信される区間である連送区間の伝搬路状況のうち少なくとも１つに基づいて、ブロック復号単位を選択するブロック復号単位選択部と、
    　連送されたブロック符号化信号の受信信号のうち一部の受信信号を用いてブロック復号を行う部分復号部と、
    　連送されたブロック符号化信号の受信信号のうち全ての受信信号を用いてブロック復号を行う全体復号部と、
    　前記部分復号部で部分復号された復号結果を用いて連送合成結果を算出する連送合成部と、
    　を備えることを特徴とする受信装置。     A receiving device that receives a transmission signal, which is a block-encoded signal continuously transmitted by the transmitting device according to any one of claims 1 to 3, as a receiving signal.
    One or more receiving antennas that receive the transmitted signal as the received signal, and
    A transmission antenna output power detection unit that calculates the reception power for each transmission signal transmitted from two or more transmission antennas included in the transmission device using the reception signal, and a transmission antenna output power detection unit.
    A continuous transmission block power detection unit that calculates the received power for each continuous transmission in the block-encoded block unit for the transmission signal that is block-encoded in the transmission device and transmitted from the transmission device using the reception signal. When,
    The block decoding unit is set based on at least one of the received power and the propagation path condition of the continuous transmission section in which the continuous transmission signal which is the plurality of transmission signals is transmitted from the transmission device to the reception device. Block decoding unit selection section to be selected and
    A partial decoding unit that performs block decoding using a part of the received signals of the continuously transmitted block-encoded signals, and
    An overall decoding unit that performs block decoding using all the received signals of the continuously transmitted block-encoded signals, and
    A continuous feeding synthesis unit that calculates a continuous feeding synthesis result using the decoding result partially decoded by the partial decoding unit, and a continuous feeding synthesis unit.
    A receiving device comprising.
  5. 　前記ブロック復号単位選択部は、前記送信アンテナ出力電力検出部で算出された受信電力に基づいて、各受信電力が規定された第１の範囲内にない場合、受信電力の大きい受信信号を用いてブロック復号を行う部分復号部を選択し、各受信電力が前記第１の範囲内の場合、全ての受信信号を用いてブロック復号を行う全体復号部を選択する、
    　ことを特徴とする請求項４に記載の受信装置。     Based on the received power calculated by the transmitting antenna output power detecting unit, the block decoding unit selection unit uses a received signal having a large received power when each received power is not within the specified first range. A partial decoding unit that performs block decoding is selected, and when each received power is within the first range, an entire decoding unit that performs block decoding using all the received signals is selected.
    The receiving device according to claim 4.
  6. 　前記ブロック復号単位選択部は、前記連送ブロック電力検出部で算出された受信電力に基づいて、複数の前記送信信号である連送信号が前記送信装置から前記受信装置に送信される区間である連送区間における各受信電力が規定された第２の範囲内にない場合、前記連送区間において受信電力の大きい１つまたは複数の受信タイミングの受信信号を用いてブロック復号を行う部分復号部を選択し、前記連送区間における各受信電力が前記第２の範囲内の場合、前記連送区間の全ての受信タイミングの受信信号を用いてブロック復号を行う全体復号部を選択する、
    　ことを特徴とする請求項４または５に記載の受信装置。     The block decoding unit selection unit is a section in which a plurality of continuous transmission signals, which are transmission signals, are transmitted from the transmission device to the reception device based on the reception power calculated by the continuous transmission block power detection unit. When each received power in the continuous transmission section is not within the specified second range, a partial decoding unit that performs block decoding using one or more reception timing reception signals having a large reception power in the continuous transmission section is used. Select, and when each received power in the continuous transmission section is within the second range, select an overall decoding unit that performs block decoding using the reception signals of all reception timings in the continuous transmission section.
    The receiving device according to claim 4 or 5.
  7. 　前記ブロック復号単位選択部は、前記伝搬路状況に基づいて、複数の前記送信信号である連送信号が前記送信装置から前記受信装置に送信される区間である連送区間における前記伝搬路状況の変動が規定された第３の範囲内にない場合、前記連送区間において前記伝搬路状況の変動が小さい１つまたは複数の受信信号を用いてブロック復号を行う部分復号部を選択し、前記連送区間における前記伝搬路状況の変動が前記第３の範囲内の場合、前記連送区間の全ての受信信号を用いてブロック復号を行う全体復号部を選択する、
    　ことを特徴とする請求項４から６のいずれか１つに記載の受信装置。     Based on the propagation path condition, the block decoding unit selection unit determines the propagation path condition in the continuous transmission section in which a plurality of continuous transmission signals, which are transmission signals, are transmitted from the transmission device to the reception device. When the fluctuation is not within the specified third range, a partial decoding unit that performs block decoding using one or a plurality of received signals having a small fluctuation in the propagation path condition in the continuous transmission section is selected, and the continuous transmission section is selected. When the fluctuation of the propagation path condition in the transmission section is within the third range, the entire decoding unit that performs block decoding using all the received signals in the continuous transmission section is selected.
    The receiving device according to any one of claims 4 to 6, wherein the receiving device is characterized by the above.
  8. 　前記連送合成部は、前記送信アンテナ出力電力検出部または前記連送ブロック電力検出部で算出された受信電力に基づいて、前記部分復号部で部分復号された復号結果を合成または選択するのかを選択し、前記連送合成結果を算出する、
    　ことを特徴とする請求項４から７のいずれか１つに記載の受信装置。     Whether the continuous transmission synthesis unit synthesizes or selects the decoding result partially decoded by the partial decoding unit based on the received power calculated by the transmission antenna output power detection unit or the continuous transmission block power detection unit. Select and calculate the continuous feed synthesis result,
    The receiving device according to any one of claims 4 to 7, wherein the receiving device is characterized by the above.
  9. 　請求項１から３のいずれか１つに記載の送信装置と、
    　請求項４から８のいずれか１つに記載の受信装置と、
    　を備えることを特徴とする通信システム。     The transmitter according to any one of claims 1 to 3,
    The receiving device according to any one of claims 4 to 8.
    A communication system characterized by comprising.
  10. 　送信装置の制御回路であって、
    　変調信号に対してブロック符号化を行い、２本以上の送信アンテナの各々から送信される送信信号を生成するブロック符号化部と、
    　前記ブロック符号化部による前記ブロック符号化の単位をブロックとし、前記送信信号に対して、送信装置ごとに異なる重み付け係数をブロック単位で付加する処理を、前記送信信号を複数回送信する連送回数の数だけ繰り返し実施する重み付け連送信号生成部と、
    　を備えることを特徴とする制御回路。     The control circuit of the transmitter
    A block coding unit that performs block coding on the modulated signal and generates a transmission signal transmitted from each of two or more transmission antennas.
    The block coding unit by the block coding unit is a block, and a process of adding a weighting coefficient different for each transmission device to the transmission signal in block units is performed, and the number of consecutive transmissions in which the transmission signal is transmitted a plurality of times. Weighted continuous signal generation unit that repeats as many times as
    A control circuit characterized by comprising.
  11. 　請求項１０に記載の制御回路を有する送信装置によって連送されたブロック符号化信号である送信信号を受信信号として受信する受信装置の制御回路であって、
    　前記送信信号を前記受信信号として受信する１本以上の受信アンテナで受信された前記受信信号を用いて、前記送信装置が備える２本以上の送信アンテナから送出された各々の送信信号ごとの受信電力を算出する送信アンテナ出力電力検出部と、
    　前記受信信号を用いて、前記送信装置においてブロック符号化され前記送信装置から送出された送信信号について、前記ブロック符号化のブロック単位で連送回数ごとの受信電力を算出する連送ブロック電力検出部と、
    　前記受信電力、および複数の前記送信信号である連送信号が前記送信装置から前記受信装置に送信される区間である連送区間の伝搬路状況のうち少なくとも１つに基づいて、ブロック復号単位を選択するブロック復号単位選択部と、
    　連送されたブロック符号化信号の受信信号のうち一部の受信信号を用いてブロック復号を行う部分復号部と、
    　連送されたブロック符号化信号の受信信号のうち全ての受信信号を用いてブロック復号を行う全体復号部と、
    　前記部分復号部で部分復号された復号結果を用いて連送合成結果を算出する連送合成部と、
    　を備えることを特徴とする制御回路。     A control circuit of a receiving device that receives a transmission signal, which is a block-encoded signal continuously transmitted by the transmitting device having the control circuit according to claim 10, as a receiving signal.
    Using the received signal received by one or more receiving antennas that receive the transmitted signal as the received signal, the received power for each transmitted signal transmitted from the two or more transmitting antennas included in the transmitting device. Transmission antenna output power detector to calculate
    A continuous transmission block power detection unit that calculates the received power for each continuous transmission in the block-encoded block unit for the transmission signal that is block-encoded in the transmission device and transmitted from the transmission device using the reception signal. When,
    The block decoding unit is set based on at least one of the received power and the propagation path condition of the continuous transmission section in which the continuous transmission signal which is the plurality of transmission signals is transmitted from the transmission device to the reception device. Block decoding unit selection section to be selected and
    A partial decoding unit that performs block decoding using a part of the received signals of the continuously transmitted block-encoded signals, and
    An overall decoding unit that performs block decoding using all the received signals of the continuously transmitted block-encoded signals, and
    A continuous feeding synthesis unit that calculates a continuous feeding synthesis result using the decoding result partially decoded by the partial decoding unit, and a continuous feeding synthesis unit.
    A control circuit characterized by comprising.
  12. 　送信装置に実行させる第１のプログラムが記憶された記憶媒体であって、
    　前記第１のプログラムは、
    　ブロック符号化部が、変調信号に対してブロック符号化を行い、２本以上の送信アンテナの各々から送信される送信信号を生成するブロック符号化ステップと、
    　重み付け連送信号生成部が、前記ブロック符号化部による前記ブロック符号化の単位をブロックとし、前記送信信号に対して、送信装置ごとに異なる重み付け係数をブロック単位で付加する処理を、前記送信信号を複数回送信する連送回数の数だけ繰り返し実施する重み付け連送信号生成ステップと、
    　を送信装置に実行させることを特徴とする記憶媒体。     A storage medium in which the first program to be executed by the transmitting device is stored.
    The first program is
    A block coding step in which the block coding unit performs block coding on the modulated signal and generates a transmission signal transmitted from each of the two or more transmitting antennas.
    The weighted continuous transmission signal generation unit sets the unit of the block coding by the block coding unit as a block, and adds a weighting coefficient different for each transmission device to the transmission signal in the block unit. A weighted continuous transmission signal generation step that repeats as many times as the number of consecutive transmissions for transmitting
    A storage medium, characterized in that the transmitter is made to execute.
  13. 　請求項１２に記載の記憶媒体に記憶された第１のプログラムを実行する送信装置によって連送されたブロック符号化信号である送信信号を受信信号として受信する１本以上の受信アンテナを備える受信装置に実行させる第２のプログラムが記憶された記憶媒体であって、
    　前記第２のプログラムは、
    　送信アンテナ出力電力検出部が、前記受信信号を用いて、前記送信装置が備える２本以上の送信アンテナから送出された各々の送信信号ごとの受信電力を算出する送信アンテナ出力電力検出ステップと、
    　連送ブロック電力検出部が、前記受信信号を用いて、前記送信装置においてブロック符号化され前記送信装置から送出された送信信号について、前記ブロック符号化のブロック単位で連送回数ごとの受信電力を算出する連送ブロック電力検出ステップと、
    　ブロック復号単位選択部が、前記受信電力、および複数の前記送信信号である連送信号が前記送信装置から前記受信装置に送信される区間である連送区間の伝搬路状況のうち少なくとも１つに基づいて、ブロック復号単位を選択するブロック復号単位選択ステップと、
    　部分復号部が、連送されたブロック符号化信号の受信信号のうち一部の受信信号を用いてブロック復号を行う部分復号ステップと、
    　全体復号部が、連送されたブロック符号化信号の受信信号のうち全ての受信信号を用いてブロック復号を行う全体復号ステップと、
    　連送合成部が、前記部分復号部で部分復号された復号結果を用いて連送合成結果を算出する連送合成ステップと、
    　を受信装置に実行させることを特徴とする記憶媒体。     A receiving device including one or more receiving antennas that receive a transmission signal, which is a block-encoded signal continuously transmitted by a transmitting device that executes the first program stored in the storage medium according to claim 12, as a receiving signal. Is a storage medium in which the second program to be executed is stored.
    The second program is
    A transmission antenna output power detection step in which the transmission antenna output power detection unit calculates the reception power for each transmission signal transmitted from two or more transmission antennas included in the transmission device using the reception signal.
    The continuous transmission block power detection unit uses the received signal to block-encode the transmission signal in the transmission device and transmit the received power for each number of consecutive transmissions in the block-encoded block unit. The continuous feed block power detection step to be calculated and
    The block decoding unit selection unit sets the received power and at least one of the propagation path conditions of the continuous transmission section, which is the section in which the continuous transmission signal which is the plurality of transmission signals is transmitted from the transmission device to the reception device. Based on the block decoding unit selection step to select the block decoding unit,
    A partial decoding step in which the partial decoding unit performs block decoding using a part of the received signals of the continuously transmitted block-encoded signals, and
    An overall decoding step in which the overall decoding unit performs block decoding using all the received signals of the continuously transmitted block-encoded signals, and
    A continuous feed synthesis step in which the continuous feed synthesis unit calculates the continuous feed synthesis result using the decoding result partially decoded by the partial decoding unit.
    A storage medium, characterized in that the receiving device executes the above.
  14. 　２本以上の送信アンテナを備える送信装置の通信方法であって、
    　ブロック符号化部が、変調信号に対してブロック符号化を行い、前記２本以上の送信アンテナの各々から送信される送信信号を生成するブロック符号化ステップと、
    　重み付け連送信号生成部が、前記ブロック符号化部による前記ブロック符号化の単位をブロックとし、前記送信信号に対して、送信装置ごとに異なる重み付け係数をブロック単位で付加する処理を、前記送信信号を複数回送信する連送回数の数だけ繰り返し実施する重み付け連送信号生成ステップと、
    　を含むことを特徴とする通信方法。     A communication method for a transmitter equipped with two or more transmitting antennas.
    A block coding step in which the block coding unit performs block coding on the modulated signal and generates a transmission signal transmitted from each of the two or more transmitting antennas.
    The weighted continuous transmission signal generation unit sets the unit of the block coding by the block coding unit as a block, and adds a weighting coefficient different for each transmission device to the transmission signal in the block unit. A weighted continuous transmission signal generation step that repeats as many times as the number of consecutive transmissions for transmitting
    A communication method characterized by including.
  15. 　前記重み付け係数は、複数の前記送信信号である連送信号が送信される区間である連送区間において、複数の前記送信装置の間で直交し、前記送信装置の前記連送回数の間で直交する値とする、
    　ことを特徴とする請求項１４に記載の通信方法。     The weighting coefficient is orthogonal between the plurality of transmission devices in the continuous transmission section which is the section in which the continuous transmission signal which is the plurality of transmission signals is transmitted, and is orthogonal between the continuous transmission times of the transmission device. To be the value to be
    The communication method according to claim 14.
  16. 　前記重み付け連送信号生成ステップにおいて、前記重み付け連送信号生成部は、前記送信信号に対して、前記送信信号を受信する受信装置における受信電力、および複数の前記送信信号である連送信号が送信される区間である連送区間におけるチャネル変動のうち少なくとも１つに基づいて、ビート干渉による影響が低減される前記重み付け係数を付加する処理を連送回数の数だけ繰り返し実施する、
    　ことを特徴とする請求項１４または１５に記載の通信方法。     In the weighted continuous transmission signal generation step, the weighted continuous transmission signal generation unit transmits the received power in the receiving device that receives the transmission signal and the continuous transmission signal which is a plurality of the transmission signals to the transmission signal. Based on at least one of the channel fluctuations in the continuous feed section, which is the section to be performed, the process of adding the weighting coefficient that reduces the influence of beat interference is repeated as many times as the number of continuous feeds.
    The communication method according to claim 14 or 15.
  17. 　請求項１４から１６のいずれか１つに記載の通信方法を実施する送信装置によって連送されたブロック符号化信号である送信信号を受信信号として受信する１本以上の受信アンテナを備える受信装置の通信方法であって、
    　送信アンテナ出力電力検出部が、前記受信信号を用いて、前記送信装置が備える２本以上の送信アンテナから送出された各々の送信信号ごとの受信電力を算出する送信アンテナ出力電力検出ステップと、
    　連送ブロック電力検出部が、前記受信信号を用いて、前記送信装置においてブロック符号化され前記送信装置から送出された送信信号について、前記ブロック符号化のブロック単位で連送回数ごとの受信電力を算出する連送ブロック電力検出ステップと、
    　ブロック復号単位選択部が、前記受信電力、および複数の前記送信信号である連送信号が前記送信装置から前記受信装置に送信される区間である連送区間の伝搬路状況のうち少なくとも１つに基づいて、ブロック復号単位を選択するブロック復号単位選択ステップと、
    　部分復号部が、連送されたブロック符号化信号の受信信号のうち一部の受信信号を用いてブロック復号を行う部分復号ステップと、
    　全体復号部が、連送されたブロック符号化信号の受信信号のうち全ての受信信号を用いてブロック復号を行う全体復号ステップと、
    　連送合成部が、前記部分復号部で部分復号された復号結果を用いて連送合成結果を算出する連送合成ステップと、
    　を含むことを特徴とする通信方法。     A receiving device including one or more receiving antennas that receives a transmission signal, which is a block-encoded signal continuously transmitted by a transmitting device that implements the communication method according to any one of claims 14 to 16, as a receiving signal. It ’s a communication method,
    A transmission antenna output power detection step in which the transmission antenna output power detection unit calculates the reception power for each transmission signal transmitted from two or more transmission antennas included in the transmission device using the reception signal.
    The continuous transmission block power detection unit uses the received signal to block-encode the transmission signal in the transmission device and transmit the received power for each number of consecutive transmissions in the block-encoded block unit. The continuous feed block power detection step to be calculated and
    The block decoding unit selection unit sets the received power and at least one of the propagation path conditions of the continuous transmission section, which is the section in which the continuous transmission signal which is the plurality of transmission signals is transmitted from the transmission device to the reception device. Based on the block decoding unit selection step to select the block decoding unit,
    A partial decoding step in which the partial decoding unit performs block decoding using a part of the received signals of the continuously transmitted block-encoded signals, and
    An overall decoding step in which the overall decoding unit performs block decoding using all the received signals of the continuously transmitted block-encoded signals, and
    A continuous feed synthesis step in which the continuous feed synthesis unit calculates a continuous feed synthesis result using the decoding result partially decoded by the partial decoding unit.
    A communication method characterized by including.
  18. 　前記ブロック復号単位選択ステップにおいて、前記ブロック復号単位選択部は、前記送信アンテナ出力電力検出部で算出された受信電力に基づいて、各受信電力が規定された第１の範囲内にない場合、受信電力の大きい受信信号を用いてブロック復号を行う部分復号部を選択し、各受信電力が前記第１の範囲内の場合、全ての受信信号を用いてブロック復号を行う全体復号部を選択する、
    　ことを特徴とする請求項１７に記載の通信方法。     In the block decoding unit selection step, the block decoding unit selection unit receives when each received power is not within the specified first range based on the received power calculated by the transmitting antenna output power detection unit. A partial decoding unit that performs block decoding using a high-power reception signal is selected, and when each received power is within the first range, a total decoding unit that performs block decoding using all the received signals is selected.
    The communication method according to claim 17.
  19. 　前記ブロック復号単位選択ステップにおいて、前記ブロック復号単位選択部は、前記連送ブロック電力検出部で算出された受信電力に基づいて、複数の前記送信信号である連送信号が前記送信装置から前記受信装置に送信される区間である連送区間における各受信電力が規定された第２の範囲内にない場合、前記連送区間において受信電力の大きい１つまたは複数の受信タイミングの受信信号を用いてブロック復号を行う部分復号部を選択し、前記連送区間における各受信電力が前記第２の範囲内の場合、前記連送区間の全ての受信タイミングの受信信号を用いてブロック復号を行う全体復号部を選択する、
    　ことを特徴とする請求項１７または１８に記載の通信方法。     In the block decoding unit selection step, the block decoding unit selection unit receives a plurality of continuous transmission signals, which are transmission signals, from the transmission device based on the reception power calculated by the continuous transmission block power detection unit. If each received power in the continuous transmission section, which is the section transmitted to the device, is not within the specified second range, the reception signal of one or more reception timings having a large reception power in the continuous transmission section is used. A partial decoding unit that performs block decoding is selected, and when each received power in the continuous transmission section is within the second range, total decoding that performs block decoding using the reception signals of all reception timings in the continuous transmission section is performed. Select a department,
    The communication method according to claim 17 or 18.
  20. 　前記ブロック復号単位選択ステップにおいて、前記ブロック復号単位選択部は、前記伝搬路状況に基づいて、複数の前記送信信号である連送信号が前記送信装置から前記受信装置に送信される区間である連送区間における前記伝搬路状況の変動が規定された第３の範囲内にない場合、前記連送区間において前記伝搬路状況の変動が小さい１つまたは複数の受信信号を用いてブロック復号を行う部分復号部を選択し、前記連送区間における前記伝搬路状況の変動が前記第３の範囲内の場合、前記連送区間の全ての受信信号を用いてブロック復号を行う全体復号部を選択する、
    　ことを特徴とする請求項１７から１９のいずれか１つに記載の通信方法。     In the block decoding unit selection step, the block decoding unit selection unit is a section in which a plurality of continuous transmission signals, which are transmission signals, are transmitted from the transmission device to the reception device based on the propagation path condition. A portion in which block decoding is performed using one or a plurality of received signals in which the fluctuation of the propagation path condition is small in the continuous transmission section when the fluctuation of the propagation path condition in the transmission section is not within the specified third range. A decoding unit is selected, and when the fluctuation of the propagation path condition in the continuous transmission section is within the third range, the entire decoding unit that performs block decoding using all the received signals in the continuous transmission section is selected.
    The communication method according to any one of claims 17 to 19, characterized in that.
  21. 　前記連送合成ステップにおいて、前記連送合成部は、前記送信アンテナ出力電力検出部または前記連送ブロック電力検出部で算出された受信電力に基づいて、前記部分復号部で部分復号された復号結果を合成または選択するのかを選択し、前記連送合成結果を算出する、
    　ことを特徴とする請求項１７から２０のいずれか１つに記載の通信方法。     In the continuous transmission synthesis step, the continuous transmission synthesis unit is a decoding result partially decoded by the partial decoding unit based on the received power calculated by the transmission antenna output power detection unit or the continuous transmission block power detection unit. Select whether to synthesize or select, and calculate the continuous synthesis result.
    The communication method according to any one of claims 17 to 20, wherein the communication method is characterized in that.
PCT/JP2019/042823 2019-10-31 2019-10-31 Transmission device, reception device, communication system, control circuit, storage medium, and communication method WO2021084693A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004112471A (en) * 2002-09-19 2004-04-08 Matsushita Electric Ind Co Ltd Apparatus and method for radio communications
WO2007061065A1 (en) * 2005-11-24 2007-05-31 Matsushita Electric Industrial Co., Ltd. Wireless communication method in multiantenna communication system
WO2008142733A1 (en) * 2007-05-21 2008-11-27 Fujitsu Limited Data retransmission method and radio communication system adopting same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004112471A (en) * 2002-09-19 2004-04-08 Matsushita Electric Ind Co Ltd Apparatus and method for radio communications
WO2007061065A1 (en) * 2005-11-24 2007-05-31 Matsushita Electric Industrial Co., Ltd. Wireless communication method in multiantenna communication system
WO2008142733A1 (en) * 2007-05-21 2008-11-27 Fujitsu Limited Data retransmission method and radio communication system adopting same

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