KR20150026949A - Method and apparatus for transmitting signal for downlink channel estimation - Google Patents

Method and apparatus for transmitting signal for downlink channel estimation Download PDF

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Publication number
KR20150026949A
KR20150026949A KR20140113477A KR20140113477A KR20150026949A KR 20150026949 A KR20150026949 A KR 20150026949A KR 20140113477 A KR20140113477 A KR 20140113477A KR 20140113477 A KR20140113477 A KR 20140113477A KR 20150026949 A KR20150026949 A KR 20150026949A
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South Korea
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resource
resources
neighboring
selecting
reference signal
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KR20140113477A
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Korean (ko)
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남준영
서방원
안재영
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한국전자통신연구원
공주대학교 산학협력단
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Priority to US14/474,932 priority Critical patent/US20150103801A1/en
Publication of KR20150026949A publication Critical patent/KR20150026949A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2612—Arrangements for wireless medium access control, e.g. by allocating physical layer transmission capacity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2621—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using frequency division multiple access [FDMA]

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The present invention relates to a signal transmission method and to an apparatus thereof for downlink channel estimation through multiple antennas. Multiple resources to be adjacent to a time shaft and a frequency shaft are selected in a resource group having multiple resources forming the symbol of the time shaft and the sub carrier of the frequency shaft. And, reference signals by multiple antennas are transmitted through the selected resources.

Description

[0001] The present invention relates to a signal transmission method for downlink channel estimation,

The present invention relates to a signal transmission method and apparatus, and more particularly, to a method and apparatus for transmitting a signal for downlink channel estimation.

In a wireless communication system, when a packet is transmitted, a transmitted packet is transmitted through a wireless channel, so that a signal may be distorted during transmission. Therefore, a signal known to both a transmitting side and a receiving side is transmitted, And when information is received, information on the channel is obtained with a degree of distortion of the signal. At this time, a signal known to both the transmitting side and the receiving side is referred to as a pilot signal or a reference signal. In order to improve transmission / reception efficiency by employing multiple transmit antennas or multiple receive antennas, a separate reference signal must exist for each transmit antenna. The reference signal can be classified into a reference signal for channel information acquisition and a reference signal for data demodulation.

The reference signal for data demodulation is a reference signal transmitted together when the base station transmits the downlink data. The terminal receives the reference signal, performs channel estimation, and demodulates the data.

In the LTE system, for a unicast service, a Common RS (CRS) for measurement related to channel status acquisition and handover, and a Dedicated RS (DRS) ). DRS is used for data demodulation, and CRS is used for two purposes: channel information acquisition and data demodulation.

In order to allow the UE to operate well in the LTE-A system, RSs for up to 8 transmit antenna ports must be additionally defined in the time-frequency domain in which the CRS defined in the LTE system is transmitted. In the LTE-A system, the reference signal is divided into two categories: a reference signal for channel measurement (CSI-RS) and a reference signal for data demodulation (DM- RS (demodulation-RS).

The CSI-RS, which is a reference signal for channel measurement purposes, is used for measurement purposes such as channel estimation, handover, and data demodulation. There are features that are designed for. Since the CSI-RS is transmitted only for the purpose of obtaining information on the channel state, unlike the CRS, the CSI-RS is not transmitted every subframe.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and an apparatus for transmitting a reference signal capable of channel estimation more effectively.

A signal transmission method according to an aspect of the present invention is a method for transmitting a signal for channel estimation through a plurality of antennas in a resource set including a plurality of resources consisting of symbols on the time axis and subcarriers on the frequency axis, Selecting a plurality of neighboring resources; And transmitting the plurality of antenna-specific reference signals through the selected resources.

The transmitting of the reference signals may divide the reference signal by the antenna by multiplying each reference signal by a two-dimensional orthogonal code.

The selecting of the resources may include selecting four resources neighboring each other on the time axis and the frequency axis as one resource pair and selecting a plurality of resource pairs from the resource set if the number of antennas is equal to or greater than the set number have.

The selecting of the resources may select a plurality of resource pairs by selecting resources corresponding to two subcarriers neighboring each other on a frequency axis only among resources corresponding to two neighboring symbols.

The transmitting of the reference signals may divide the reference signals transmitted through the one resource pair by the reference signals by multiplying the reference signals by the two-dimensional orthogonal code.

The transmitting of the reference signals may include multiplying the reference signals transmitted through the one resource pair by orthogonal codes having a length of 2 on the time axis with respect to each reference signal, have.

The selecting of the resources may include selecting resources corresponding to two subcarriers adjacent to each other on a frequency axis from among resources corresponding to symbol pairs each consisting of two symbols neighboring each other on a time axis in the resource set, A plurality of resource pairs can be selected.

The selecting of the resources may include selecting resources corresponding to two subcarriers adjacent to each other in the frequency axis among the resources corresponding to the first symbol pair including the neighboring first symbol and the second symbol, A method of forming a second resource pair by selecting resources corresponding to two subcarriers adjacent to each other on a frequency axis from among resources corresponding to a second symbol pair consisting of neighboring third symbols and fourth symbols, , A plurality of resource pairs can be selected.

Here, each pair of symbols may not be adjacent to each other.

In the transmitting of the reference signals, the reference signals transmitted through the one pair of resources may be multiplied by the two-dimensional orthogonal codes, and the reference signals through the pair of resources may be classified by antennas.

The transmitting of the reference signals may include multiplying the reference signals transmitted through the one resource pair by orthogonal codes having a length of 2 on the time axis with respect to each reference signal, have.

According to another aspect of the present invention, there is provided an apparatus for transmitting a signal for channel estimation through a plurality of antennas, the apparatus comprising: a radio frequency transducer for transmitting and receiving signals through a plurality of antennas; And a process of controlling transmission of a reference signal for channel estimation, wherein the processor comprises: a plurality of resource groups including a plurality of resources including a symbol of a time axis and a subcarrier of a frequency axis; A resource selection unit for selecting resources; And an orthogonal code applying unit for applying orthogonal codes to the plurality of antenna-specific reference signals to be transmitted through the selected resources.

When four resources neighboring to each other on the time axis and the frequency axis are one resource pair, the orthogonal code application unit multiplies the reference signals to be transmitted through the resource pair by a two-dimensional orthogonal code, .

The resource selecting unit selects resources corresponding to two subcarriers adjacent to each other in the frequency axis among the resources corresponding to two neighboring symbols if the number of antennas is equal to or greater than the preset number, You can choose multiple.

Wherein the resource selector selects resources corresponding to two neighboring subcarriers on the frequency axis from resources corresponding to symbol pairs each consisting of two symbols neighboring each other on the time axis in the resource set, You can choose multiple.

The orthogonal code application unit multiplies the reference signals to be transmitted through the resource pair by the orthogonal code having a length of 2 on the time axis, It is possible to distinguish a star reference signal.

The resource selecting unit selects resources corresponding to two subcarriers adjacent to each other in the frequency axis among the resources corresponding to two neighboring symbols if the number of antennas is equal to or greater than the preset number, You can choose multiple.

Wherein the resource selector selects resources corresponding to two neighboring subcarriers on the frequency axis from resources corresponding to symbol pairs each consisting of two symbols neighboring each other on the time axis in the resource set, You can choose multiple.

According to an embodiment of the present invention, a reference signal for estimating downlink channel state information can be efficiently transmitted. In particular, reference signals may be transmitted to estimate channel state information for eight or more transmit antenna ports.

1 is a diagram illustrating transmission of a reference signal for channel estimation in a wireless communication system according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating a process of transmitting different reference signals using the orthogonal code according to an embodiment of the present invention.
3 is a diagram illustrating a resource configuration for transmitting a reference signal according to a first embodiment of the present invention.
4 is a diagram illustrating transmission of a reference signal using four neighboring resources on a time axis and a frequency axis according to a first embodiment of the present invention.
5 is a diagram illustrating a process of multiplying a reference signal according to the first embodiment of the present invention by a two-dimensional orthogonal code and transmitting the result.
6 is a diagram illustrating a process of multiplying a reference signal according to a second embodiment of the present invention by a two-dimensional orthogonal code and transmitting the result.
7 is a diagram illustrating a process of multiplying a reference signal according to a third embodiment of the present invention by a two-dimensional orthogonal code and transmitting the result.
8 is a diagram illustrating another example of a method of transmitting a reference signal according to a third embodiment of the present invention.
9 is a diagram illustrating a process of transmitting a reference signal according to a fourth embodiment of the present invention.
10 is a flowchart of a method for transmitting a reference signal according to an embodiment of the present invention.
11 is a diagram illustrating a structure of an apparatus for transmitting a reference signal according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

Throughout the specification, a terminal is referred to as a mobile terminal (MT), a mobile station (MS), an advanced mobile station (AMS), a high reliability mobile station (HR- A subscriber station (SS), a portable subscriber station (PSS), an access terminal (AT), a user equipment (UE) , HR-MS, SS, PSS, AT, UE, and the like.

Also, a base station (BS) is an advanced base station (ABS), a high reliability base station (HR-BS), a node B, an evolved node B, eNodeB), an access point (AP), a radio access station (RAS), a base transceiver station (BTS), a mobile multihop relay (MMR) (RS), a relay node (RN) serving as a base station, an advanced relay station (ARS) serving as a base station, a high reliability relay station (HR) A femto BS, a home Node B, a HNB, a pico BS, a metro BS, a micro BS, ), Etc., and may be all or part of an ABS, a Node B, an eNodeB, an AP, a RAS, a BTS, an MMR-BS, an RS, an RN, an ARS, It may include a negative feature.

Hereinafter, a signal transmission method and apparatus for downlink channel estimation according to an embodiment of the present invention will be described with reference to the drawings.

1 is a diagram illustrating transmission of a reference signal for channel estimation in a wireless communication system according to an embodiment of the present invention.

Transmits a reference signal to estimate channel state information in a wireless communication system (e.g., 3GPP LTE / LTE-A system). And transmits a CSI-RS (channel state information-reference signal) as a reference signal. A reference signal for estimating channel state information (CSI-RS) for a plurality of (e.g., up to 8) transmit antennas can be transmitted through a resource block (RB) as shown in FIG.

FIG. 1 shows an example of transmitting a reference signal (CSI-RS) for eight transmit antennas in a resource block, where the resource block includes, for example, 12 subcarriers and 12 or 14 orthogonal frequency division modulation) symbols. Assuming that the number of transmission antenna ports is eight, for convenience of explanation, it is assumed that the antenna ports are 0, 1, 2, ... , And 7, respectively. The resource (RE) occupying the subcarrier number A and the OFDM symbol number B is denoted by "E (A, B)" for convenience of explanation. As illustrated in FIG. 1, two resources RE (0,9) and RE (0,10) are used to transmit a reference signal (CSI-RS) for transmission antenna ports 0 and 1. Since the reference signals (CSI-RS) for antenna ports 0 and 1 are transmitted through the same resource, in order to distinguish two reference signals (CSI-RS) transmitted through the same resource, Multiplies a one-dimensional orthogonal code having a length of 2. That is, the orthogonal code [1, 1] is multiplied by the reference signal (CSI-RS) for the antenna port 0, and [1, -1] Multiply the orthogonal code.

FIG. 2 is a diagram illustrating a process of transmitting different reference signals using the orthogonal code according to an embodiment of the present invention.

In FIG. 2, i denotes an i- th OFDM symbol, and j denotes a j- th subcarrier. c n is a sequence of CSI-RSs existing in the n-th RB and has a + D or -D value. Where D is a constant.

The base station transmits a reference signal (CSI-RS) for two antenna ports to two neighboring resources (REs) on the time axis, and transmits an orthogonal The code is multiplied by the reference signal on the time axis.

1, for example, in reference to OFDM symbol # 9, a reference signal (CSI-RS) for an antenna port # 0 is transmitted from a 0th subcarrier in a resource block (RB) , The signal for antenna port 0 is not transmitted in subcarrier # 7. In order to make the sum of the transmit power of each transmit antenna port equal for each OFDM symbol, a reference signal (CSI-RS) for transmit antenna port 0 is transmitted from RE (0,9) and RE (0,10) , It will transmit at four times higher power. For the same reason, when the reference signal (CSI-RS) for the transmission antenna port # 1 is transmitted from RE (0,9) and RE (0,10) When the reference signal (CSI-RS) for RE (1,9) and (1,10) is transmitted at a power of 4 times higher.

In an embodiment of the present invention, a reference signal for a plurality of transmit antenna ports is transmitted using a plurality of resources neighboring on a time axis and a frequency axis for more efficient transmission of a reference signal, and an orthogonal code is transmitted as a reference signal And transmits the result.

3 is a diagram illustrating a resource configuration for transmitting a reference signal according to a first embodiment of the present invention.

In the first embodiment of the present invention, a reference signal (CSI) for a plurality of (for example, eight) transmit antenna ports using a plurality of (for example, at least four) -RS).

4 is a diagram illustrating transmission of a reference signal using four neighboring resources on a time axis and a frequency axis according to a first embodiment of the present invention.

4, RE (0,9), RE (0, 0), RE (0,1), RE (0,1), and RE (CSI-RS) for the four antenna ports 0, 1, 4 and 5 are transmitted using RE (1,9) and RE (1,9) (CSI-RS) for the remaining four antenna ports 2, 3, 6 and 7 are transmitted together using RE (6, 10), RE (7, 9) do. Then, each reference signal is multiplied by a two-dimensional orthogonal code having a length of 2 on the time axis and a length of 2 on the frequency axis so that the four antenna ports can be distinguished from each other.

5 is a diagram illustrating a process of multiplying a reference signal according to the first embodiment of the present invention by a two-dimensional orthogonal code and transmitting the result.

Here, i denotes an i- th OFDM symbol, and j denotes a j- th subcarrier. Antenna ports 0 and 1 have orthogonality between neighboring resources on the time axis, and antenna ports 4 and 5 have orthogonality between neighboring resources on the time axis. The antennas 0 and 1 have two-dimensional orthogonality with antenna ports 4 and 5, respectively.

Meanwhile, in the embodiment of the present invention, reference signals can be transmitted for more than eight transmit antenna ports.

In order to transmit a reference signal through eight or more transmit antenna ports, the first method is to transmit a reference signal (CSI-RS) for more than eight transmit antenna ports for two neighboring OFDM symbol intervals. In this case, a CSI-RS is transmitted using a two-resource orthogonal code according to an embodiment of the present invention to transmit CSI-RSs for more than eight transmit antenna ports in two neighboring OFDM symbol intervals do.

6 is a diagram illustrating a process of multiplying a reference signal according to a second embodiment of the present invention by a two-dimensional orthogonal code and transmitting the result.

FIG. 6 shows a method of transmitting a reference signal (CSI-RS) for 16 transmit antenna ports for two neighboring OFDM symbol intervals.

As shown in FIG. 6, two OFDM symbols on the time axis and eight subcarriers on the frequency axis are used to transmit reference signals through 16 transmission antenna ports that are more than eight. At this time, a reference signal (CSI-RS) for four transmit antenna ports is transmitted to four resources (RE) neighboring on the time axis and a frequency axis, and a reference signal CSI-RSs) with a two-dimensional orthogonal code. Here, in the method of selecting eight subcarriers, four pairs of two neighboring subcarriers can be selected.

For example, in the OFDM symbol # 9, the CSI-RS for the transmission antenna port # 0 is transmitted from the 0th and # 1 subcarriers, and the 2th, 3th, 6th, 7th, It can be seen that it is not transmitted. Therefore, in order to make the sum of the transmission power for each transmission antenna port equal for each OFDM symbol, the reference signal (CSI-RS) for the transmission antenna port 0 is RE (0,9), RE (0,10) , RE (1,9), and RE (1,10), respectively. That is, when transmitting a reference signal (CSI-RS) for 16 transmit antenna ports for two neighboring OFDM symbols, reference (CSI-RS) Signal (CSI-RS).

When transmitting a reference signal (CSI-RS) for 12 transmit antenna ports for two neighboring OFDM symbol intervals, six subcarriers are used for the frequency axis. At this time, in a method of selecting six subcarriers, two pairs of neighboring subcarriers can be selected.

On the other hand, a second method of transmitting a reference signal (CSI-RS) for more than eight transmit antenna ports is to use more than two OFDM symbols.

7 is a diagram illustrating a process of multiplying a reference signal according to a third embodiment of the present invention by a two-dimensional orthogonal code and transmitting the result.

FIG. 7 shows an example of a method of transmitting a reference signal (CSI-RS) for 16 transmit antenna ports using four OFDM symbols. At this time, when four resources (REs) are adjacent to the time axis and the frequency axis, one way to multiply the orthogonal code is to multiply the one-dimensional orthogonal code having a length of 2 on the time axis. Another way to multiply an orthogonal code is to multiply a two-dimensional orthogonal code according to an embodiment of the present invention. In FIG. 7, a reference signal is multiplied by a one-dimensional orthogonal code having a length of 2 on the time axis and transmitted.

8 is a diagram illustrating another example of a method of transmitting a reference signal according to a third embodiment of the present invention.

In FIG. 8, a reference signal (CSI-RS) for 24 transmit antenna ports is transmitted using six OFDM symbols. In this example, the reference signal is multiplied by a one-dimensional orthogonal code having a length of 2 on the time axis for transmission, but a two-dimensional orthogonal code may be multiplied by a reference signal and transmitted.

On the other hand, a third method of transmitting a reference signal (CSI-RS) for more than eight transmit antenna ports is to use a combination of the two methods presented above. That is, more than two OFDM symbols are used and a two-dimensional orthogonal code is used.

9 is a diagram illustrating a process of transmitting a reference signal according to a fourth embodiment of the present invention.

FIG. 9 shows an example of a method of transmitting reference signals (CSI-RS) for 24 transmit antenna ports using four OFDM symbols and a two-dimensional orthogonal code. In this case, when transmitting a reference signal (CSI-RS) for more than eight transmit antenna ports over two neighboring OFDM symbols, a two-dimensional orthogonal code according to the embodiment of the present invention is applied.

On the other hand, in the case of transmitting a reference signal (CSI-RS) for a transmission antenna port that is less than or equal to eight over two neighboring OFDM symbols, one method of multiplying orthogonal codes is to use a time- Dimensional orthogonal code. Another method is to multiply a two-dimensional orthogonal code according to an embodiment of the present invention.

10 is a flowchart of a method for transmitting a reference signal according to an embodiment of the present invention.

In order to transmit a reference signal, a resource for transmission of a reference signal is selected based on the number of transmit antenna ports in a resource set including a plurality of subcarriers on the frequency axis and a plurality of OFDM symbols on the time axis.

Specifically, in a resource set, when a block consisting of a symbol on the time axis and a subcarrier on the frequency axis is referred to as a resource, a plurality of resources (for example, four) neighboring each other on the time axis and the frequency axis are selected. When a plurality of resources selected as described above are referred to as a resource pair for convenience of explanation, a reference signal for a plurality of (e.g., four) transmit antenna ports can be transmitted through one resource pair. To distinguish a plurality of reference signals transmitted through one resource pair, a reference signal of each resource is multiplied by a two-dimensional orthogonal code or a one-dimensional orthogonal code.

At this time, a plurality of resource pairs can be formed based on the number of antennas, that is, the number of transmission antenna ports.

In order to select resources corresponding to the number of transmission antenna ports, a pair of resources according to an embodiment of the present invention includes a set of resources (e.g., four) (S100).

If the number of transmit antenna ports is a set number of ports (for example, four), one resource pair is selected from the resource set and the reference signal is transmitted through the selected resource pair (S110, S120). A two-dimensional orthogonal code is applied to the corresponding resource pair to discriminate reference signals transmitted through the transmission antenna port (S130).

If the number of transmit antenna ports is larger than the number of set ports (for example, 4), a plurality of resource pairs are selected in the resource set. In this case, the resource pair can be selected only for two neighboring OFDM symbol intervals (S140). That is, as illustrated in FIG. 4 and FIG. 6, a resource pair is formed only for a section including two neighboring OFDM symbols. For example, a plurality of resource pairs are selected by selecting a resource corresponding to two neighboring subcarriers out of the resources corresponding to the neighboring first symbol and the second symbol. The resources constituting the resource pair correspond to the first symbol and the second symbol and correspond to the two selected subcarriers, and are adjacent to each other on the time axis and the frequency axis.

Then, a reference signal is transmitted through a plurality of selected resource pairs, and a reference signal transmitted through a transmission antenna port is discriminated by applying a two-dimensional orthogonal code to each resource pair (S150). Or one-dimensional orthogonal code having a length of 2 on the time axis for each resource pair is applied to distinguish reference signals transmitted through the transmission antenna ports (S160).

Also, when selecting a plurality of resource pairs, the resource pair can be selected using more than two OFDM symbols (S170). That is, as illustrated in FIGS. 7 and 8, resource pairs are formed using resources corresponding to symbol pairs of two neighboring symbols on the time axis. For example, a resource corresponding to two neighboring subcarriers is selected from among resources corresponding to a first symbol pair of a neighboring first symbol and a second symbol, and a second resource corresponding to a neighboring third symbol and a second symbol of a fourth symbol, Selects a resource corresponding to two neighboring sub-carriers from among resources corresponding to a symbol pair, and obtains a plurality of resource pairs. Here, each pair of symbols may not be adjacent to each other. The resources constituting the resource pair correspond to the two symbols and correspond to the two selected subcarriers, and are adjacent to each other on the time axis and the frequency axis.

A reference signal is transmitted through a plurality of selected resource pairs, and a reference signal transmitted through a transmission antenna port is divided by applying a two-dimensional orthogonal code to each resource pair. Or a one-dimensional orthogonal code having a length of 2 on the time axis for each resource pair to distinguish reference signals transmitted through the transmission antenna ports.

11 is a diagram illustrating a structure of a signal transmission apparatus according to an embodiment of the present invention.

11, the signal transmission apparatus 100 includes a processor 110, a memory 120, and a radio frequency (RF) converter 130. As shown in FIG. The processor 110 may be configured to implement the procedures and methods described above with reference to Figures 2-10.

For this, the processor 110 may include a resource selection unit 111 and an orthogonal code application unit 112.

The resource selection unit 111 selects a plurality of resources (for example, four) neighboring to each other on the time axis and the frequency axis in a resource set made up of resources consisting of symbols on the time axis and subcarriers on the frequency axis.

The orthogonal code application unit 112 multiplies each reference signal by a two-dimensional orthogonal code or a two-dimensional orthogonal code having a length of 2 in order to transmit a reference signal through the resources selected by the resource selection unit 111. [ The orthogonal code application unit 112 may be implemented as shown in FIG.

The memory 120 is coupled to the processor 11 and stores various information related to the operation of the processor 110. [ The RF converter 130 is connected to the processor 110 and transmits or receives a radio signal, and in particular, can transmit and receive signals using multiple antennas.

The embodiments of the present invention are not limited to the above-described apparatuses and / or methods, but may be implemented through a program for realizing functions corresponding to the configuration of the embodiment of the present invention, a recording medium on which the program is recorded And such an embodiment can be easily implemented by those skilled in the art from the description of the embodiments described above.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (18)

In a method of transmitting a signal for channel estimation through a plurality of antennas
Selecting a plurality of resources neighboring each other on a time axis and a frequency axis in a resource set including a plurality of resources consisting of symbols on the time axis and subcarriers on the frequency axis; And
Transmitting reference signals for the plurality of antennas through the selected resources
/ RTI > The method of claim 1, wherein
Wherein the step of transmitting the reference signals divides the reference signal for each antenna by multiplying each reference signal by a two-dimensional orthogonal code. The method of claim 1, wherein
The step of selecting the resources
Wherein, when four resources neighboring each other on the time axis and the frequency axis are one resource pair, if the number of the plurality of antennas is equal to or greater than the set number, the plurality of resource pairs are selected from the resource set. The method of claim 3, wherein
The step of selecting the resources
And selects a plurality of resource pairs by selecting resources corresponding to two subcarriers adjacent to each other on a frequency axis only among resources corresponding to two neighboring symbols. The method of claim 4, wherein
The step of transmitting the reference signals
And multiplying each reference signal by a two-dimensional orthogonal code with respect to reference signals transmitted through the one resource pair, thereby dividing the reference signal through the resource pair for each antenna. The method of claim 4, wherein
The step of transmitting the reference signals
And multiplying each reference signal by orthogonal code having a length of 2 on a time axis with respect to reference signals transmitted through the one resource pair to divide the reference signal through the resource pair for each antenna. The method of claim 3, wherein
The step of selecting the resources
Selecting a plurality of resource pairs by selecting resources corresponding to two subcarriers adjacent to each other on a frequency axis from among resources corresponding to symbol pairs of two symbols neighboring each other on a time axis in the resource set, Signal transmission method. The method of claim 7, wherein
The step of selecting the resources
A first resource pair is formed by selecting resources corresponding to two subcarriers adjacent to each other on a frequency axis from among resources corresponding to a first symbol pair including first neighboring symbols and second neighboring symbols, A method of forming a second resource pair by selecting resources corresponding to two subcarriers adjacent to each other in a frequency axis from among resources corresponding to a second symbol pair including a 3 symbol and a 4th symbol, A signal transmission method. The method of claim 7, wherein
Each pair of symbols not neighboring each other. The method of claim 7, wherein
The step of transmitting the reference signals
And multiplying each reference signal by a two-dimensional orthogonal code with respect to reference signals transmitted through the one resource pair, thereby dividing the reference signal through the resource pair for each antenna. The method of claim 7, wherein
The step of transmitting the reference signals
And multiplying each reference signal by orthogonal code having a length of 2 on a time axis with respect to reference signals transmitted through the one resource pair to divide the reference signal through the resource pair for each antenna. In an apparatus for transmitting a signal for channel estimation through a plurality of antennas,
A radio frequency converter for transmitting and receiving signals through a plurality of antennas, and
And a process of controlling transmission of a reference signal for channel estimation, the process being connected to the radio frequency converter,
The processor comprising:
A resource selecting unit for selecting a plurality of resources neighboring each other on a time axis and a frequency axis in a resource set including a plurality of resources consisting of symbols on the time axis and subcarriers on the frequency axis; And
An orthogonal code applying unit for applying orthogonal codes to the plurality of reference signals for each antenna to be transmitted through the selected resources,
And a signal transmission device. The method of claim 12, wherein
If four resources neighboring each other on the time axis and the frequency axis are referred to as one resource pair,
Wherein the orthogonal code applying unit multiplies the reference signals to be transmitted through the resource pair by a two-dimensional orthogonal code, thereby distinguishing the antenna-specific reference signals. The method of claim 13, wherein
The resource selecting unit selects resources corresponding to two subcarriers adjacent to each other in the frequency axis among the resources corresponding to two neighboring symbols if the number of antennas is equal to or greater than the preset number, A signal transmission apparatus for selecting a plurality of signals. The method of claim 13, wherein
Wherein the resource selector selects resources corresponding to two neighboring subcarriers on the frequency axis from resources corresponding to symbol pairs each consisting of two symbols neighboring each other on the time axis in the resource set, A signal transmission apparatus for selecting a plurality of signals. The method of claim 12, wherein
If four resources neighboring each other on the time axis and the frequency axis are referred to as one resource pair,
Wherein the orthogonal code applying unit multiplies the reference signals to be transmitted through the resource pair by orthogonal codes having a length of 2 in the time axis to distinguish the reference signals for each antenna. The method of claim 16, wherein
The resource selecting unit selects resources corresponding to two subcarriers adjacent to each other in the frequency axis among the resources corresponding to two neighboring symbols if the number of antennas is equal to or greater than the preset number, A signal transmission apparatus for selecting a plurality of signals. The method of claim 16, wherein
Wherein the resource selector selects resources corresponding to two neighboring subcarriers on the frequency axis from resources corresponding to symbol pairs each consisting of two symbols neighboring each other on the time axis in the resource set, A signal transmission apparatus for selecting a plurality of signals.



KR20140113477A 2013-09-02 2014-08-28 Method and apparatus for transmitting signal for downlink channel estimation KR20150026949A (en)

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WO2016175609A1 (en) * 2015-04-30 2016-11-03 삼성전자 주식회사 Apparatus and method for estimating downlink channel in wireless communication system
US11277236B2 (en) 2016-08-12 2022-03-15 Lg Electronics Inc. Method for transmitting or receiving downlink signal by terminal and base station in wireless communication system and device for supporting same
CN114285540A (en) * 2015-09-07 2022-04-05 凝聚技术公司 Multiple access using orthogonal time frequency space modulation

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016175609A1 (en) * 2015-04-30 2016-11-03 삼성전자 주식회사 Apparatus and method for estimating downlink channel in wireless communication system
CN107624235A (en) * 2015-04-30 2018-01-23 三星电子株式会社 Apparatus and method for estimating the downlink channel in wireless communication system
US10367659B2 (en) 2015-04-30 2019-07-30 Samsung Electronics Co., Ltd. Apparatus and method for estimating downlink channel in wireless communication system
CN107624235B (en) * 2015-04-30 2020-08-28 三星电子株式会社 Apparatus and method for estimating downlink channel in wireless communication system
CN114285540A (en) * 2015-09-07 2022-04-05 凝聚技术公司 Multiple access using orthogonal time frequency space modulation
US12068846B2 (en) 2015-09-07 2024-08-20 Cohere Technologies, Inc. Multiple access using orthogonal time frequency space modulation
US11277236B2 (en) 2016-08-12 2022-03-15 Lg Electronics Inc. Method for transmitting or receiving downlink signal by terminal and base station in wireless communication system and device for supporting same

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