CN100571239C - Synchronizing pilot sequence generation system and method in the communication system - Google Patents
Synchronizing pilot sequence generation system and method in the communication system Download PDFInfo
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Abstract
The invention discloses the synchronizing pilot sequence generation system in a kind of communication system, this system comprises: the baseband signal sequence generating unit is used to generate the baseband signal sequence; Power adjustment unit, be used for the baseband signal sequence that the baseband signal sequence generating unit is generated be multiply by different coefficients respectively, the power that makes the pairing discrete spectral line of a part of baseband signal sequence is zero, and the pairing discrete spectral line of another part baseband signal sequence is the single-frequency pilot tone; Multiplexing Unit is multiplexed with a circuit-switched data with the baseband signal sequence of power adjustment unit output and sends the random frequency hopping unit to; The random frequency hopping unit is used for the spectrum position in the synchronizing channel randomly changing single-frequency pilot tone of each frame; The synchronizing pilot sequence generating unit is used for generating the synchronizing pilot sequence according to the data behind the random frequency hopping.After using the present invention, the synchronizing pilot sequence that is generated can improve the Frequency offset estimation performance significantly.
Description
Technical field
The present invention relates to the mobile communication technology field, more specifically, the present invention relates to synchronizing pilot sequence generation system and method in the communication system.
Background technology
Current, whole world digital mobile communication system (GSM) and code division multiple access (CDMA) mobile communication system have all obtained using very widely in worldwide, and Wideband Code Division Multiple Access (WCDMA) (WCDMA) and CDMA 2000 mobile communication system such as (CDMA2000) have also obtained application within the specific limits.OFDM (OFDM) technology has the ability of antagonism intersymbol interference (ISI), can provide very high spectrum efficiency simultaneously, therefore is regarded as one of most possible transmission technology that adopts of mobile radio system of future generation.The OFDM technology has obtained extensive use at numerous areas such as Digital Subscriber Loop, digital audio/video broadcasting, WLAN (wireless local area network) and wireless MANs.
Simultaneous techniques is one of key technology in the communication system, and the Carrier frequency offset estimation technology is requisite a kind of in the communication system simultaneous techniques.Such as, for ofdm system, carrier frequency shift can be introduced inter-carrier interference (ICI), causes the effective signal-to-noise ratio (SNR) of system to descend, and makes system performance degradation.For SNR is descended less than 0.1dB, maximum frequency deviation should be less than 1% of subcarrier spacing.In ofdm system, generally adopt track loop to carry out frequency offset detection, and estimate frequency offseting value, and then carry out frequency compensation.Projection method for frequency deviation mainly comprises according to synchronization blocks special-purpose in the OFDM frame (Frame) to be analyzed, analyzes, utilizes the characteristic of OFDM symbol or frequency spectrum to analyze etc. according to the signal of fast Fourier transform (FFT) output.
A kind of frequency offset estimation methods based on the single-frequency pilot frequency sequence is arranged at present.In this method, can cause the frequency spectrum shift of pilot frequency sequence according to carrier frequency shift, design has the pilot frequency sequence of pectination frequency spectrum, thereby can estimate the frequency domain skew.Fig. 1 is based on the spectrogram of the synchronizing signal of single-frequency pilot frequency sequence in the prior art.As shown in Figure 1, pilot frequency sequence has the pectination frequency spectrum, thereby can estimate the frequency domain skew.
In this frequency offset estimation methods based on the single-frequency pilot frequency sequence, maximum can detected Frequency offset estimation be at interval 0.5 times of pectination frequency.But,, then adopt the frequency offset method of this single-frequency pilot frequency sequence can not accurately detect frequency shift (FS) if carrier frequency shift surpasses this scope.This single-frequency pilot frequency sequence with pectination frequency spectrum makes that the frequency shift (FS) precision only is a subcarrier spacing.For multicarrier system, adopt this single-frequency pilot frequency sequence to introduce ICI significantly with pectination frequency spectrum, it is desired than the low error rate index to satisfy communication system.
Summary of the invention
In view of this, main purpose of the present invention has been to provide the generation system of the synchronizing pilot sequence in a kind of communication system, to generate the synchronizing pilot sequence that can improve the Frequency offset estimation performance.
Another object of the present invention is to provide the sequence generating method of the synchronizing pilot in a kind of communication system, to generate the synchronizing pilot sequence that can improve the Frequency offset estimation performance.
For achieving the above object, technical scheme of the present invention is achieved in that
Synchronizing pilot sequence generation system in a kind of communication system, this system comprises:
The baseband signal sequence generating unit is used to generate the baseband signal sequence;
Power adjustment unit, be used for the baseband signal sequence that the baseband signal sequence generating unit is generated be multiply by different coefficients respectively, the power that makes the pairing discrete spectral line of a part of baseband signal sequence is zero, and the pairing discrete spectral line of another part baseband signal sequence is the single-frequency pilot tone;
Multiplexing Unit is multiplexed with a circuit-switched data with the baseband signal sequence of power adjustment unit output and sends the random frequency hopping unit to;
The random frequency hopping unit is used for the spectrum position in the synchronizing channel randomly changing single-frequency pilot tone of each frame;
The synchronizing pilot sequence generating unit is used for generating the synchronizing pilot sequence according to the data behind the random frequency hopping;
Wherein the baseband signal sequence generating unit is connected with power adjustment unit, and power adjustment unit is connected with Multiplexing Unit, and Multiplexing Unit is connected with the random frequency hopping unit, and the random frequency hopping unit is connected with the synchronizing pilot sequence generating unit.
Described baseband signal sequence generating unit comprises:
Broadband composition generation unit, being used to export described power is the zero pairing baseband signal sequence of discrete spectral line;
Arrowband composition generation unit is used to export the pairing baseband signal sequence of discrete spectral line of described single-frequency pilot tone.
The spectral line that described discrete spectral line is the single-frequency pilot tone is single.
The power of described discrete spectral line is that zero spectral line is many.
Described random frequency hopping unit is used for the spectrum position in the synchronizing channel randomly changing single-frequency pilot tone of each frame, makes frequency interval between the single-frequency pilot tone greater than the channel coherence bandwidth.
Described communication system is an ofdm system.
Synchronizing pilot sequence generating method in a kind of communication system may further comprise the steps:
A, generation baseband signal sequence;
B, the baseband signal sequence be multiply by different coefficients respectively, the power that makes the pairing discrete spectral line of a part of baseband signal sequence is zero, and the pairing discrete spectral line of another part baseband signal sequence is the single-frequency pilot tone;
C, the baseband signal sequence of step B output is multiplexed with a circuit-switched data, and in the synchronizing channel of each frame the spectrum position of randomly changing single-frequency pilot tone;
D, generate the synchronizing pilot sequence according to the data behind the random frequency hopping.
Generating power is the zero pairing baseband signal sequence of discrete spectral line; Generate the pairing baseband signal sequence of discrete spectral line of described single-frequency pilot tone.
The spectrum position of randomly changing single-frequency pilot tone in the synchronizing channel of each frame makes frequency interval between the single-frequency pilot tone greater than the channel coherence bandwidth.
The spectral line that described discrete spectral line is the single-frequency pilot tone is single.
The power of described discrete spectral line is that zero spectral line is many.
Step C comprises: the spectrum position of randomly changing single-frequency pilot tone, the spectrum intervals of the single-frequency pilot tone in wherein continuous a plurality of frames is not wait.
Step C comprises: the spectrum position of randomly changing single-frequency pilot tone, the position of the single-frequency pilot tone in wherein continuous a plurality of frames are that random frequency hopping distributes.
Described communication system is an ofdm system.
Synchronizing pilot sequence generation system in a kind of communication system comprises continuous successively string and converting unit, map unit, invert fast fourier transformation (IFFT)/inverse discrete Fourier transformer inverse-discrete (IDFT) unit, parallel serial conversion unit;
The circuit-switched data that string and converting unit are used for receiving is converted to the multidiameter delay data, map unit is used for the multidiameter delay data are mapped to each subcarrier with certain rule, and the IFFT/IDFT unit is used for sending parallel serial conversion unit output to behind the execution of the data after the mapping inverse-Fourier transform; This system also comprises:
The baseband signal sequence generating unit is used to generate the baseband signal sequence;
Power adjustment unit, be used for the baseband signal sequence that the baseband signal sequence generating unit is generated be multiply by different coefficients respectively, the power that makes the pairing discrete spectral line of a part of baseband signal sequence is zero, and the pairing discrete spectral line of another part baseband signal sequence is the single-frequency pilot tone;
Multiplexing Unit is multiplexed with a circuit-switched data with the baseband signal sequence of power adjustment unit output and sends string and converting unit to;
Random frequency hopping control logic device is used for sending the random frequency hopping order to map unit, and map unit is further used for the spectrum position according to described random frequency hopping order randomly changing single-frequency pilot tone in the synchronizing channel of each frame;
Wherein random frequency hopping control logic device is connected with map unit.
Described baseband signal sequence generating unit comprises:
Broadband composition generation unit, being used to export described amplitude is the zero pairing baseband signal sequence of discrete spectral line;
Arrowband composition generation unit is used to export the pairing baseband signal sequence of discrete spectral line of described single-frequency pilot tone.
Described communication system is an ofdm system.
In the technique scheme as can be seen, in the present invention, power adjustment unit in the synchronizing pilot sequence generation system, be used for the baseband signal sequence that the baseband signal sequence generating unit is generated be multiply by different coefficients respectively, the power that makes the pairing discrete spectral line of a part of baseband signal sequence is zero, and the pairing discrete spectral line of another part baseband signal sequence is the single-frequency pilot tone; And comprise the random frequency hopping unit, be used for spectrum position in the synchronizing channel randomly changing single-frequency pilot tone of each frame.This shows, in the present invention, the synchronizing pilot sequence that generates is made up of two parts in fact: a part is the composition with zero energy spectrum, another part is the composition with higher-wattage spectrum, by changing the spectrum position of single-frequency pilot tone, such as preferably making frequency interval between the single-frequency pilot tone, thereby the Frequency offset estimation error that causes owing to the frequency-selective channel decline can be overcome effectively, and then the Frequency offset estimation performance can be improved significantly greater than the channel coherence bandwidth.
Description of drawings
Fig. 1 is based on the spectrogram of the synchronizing signal of the Frequency offset estimation of single-frequency pilot frequency sequence in the prior art.
Fig. 2 is the discrete frequency spectral line schematic diagram of synchronizing pilot sequence according to an embodiment of the invention.
Fig. 3 is the discrete frequency spectral line schematic diagram of synchronizing pilot sequence in continuous according to an embodiment of the invention three frames.
Fig. 4 is the schematic diagram of synchronizing pilot structure according to an embodiment of the invention.
Fig. 5 is the structural representation of synchronizing pilot sequence generation system according to an embodiment of the invention.
Fig. 6 is the exemplary flow schematic diagram of synchronizing pilot sequence generating method according to an embodiment of the invention.
Fig. 7 is the demonstrative structure schematic diagram of synchronizing pilot sequence generation system according to an embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention express clearlyer, the present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
In order to improve the Frequency offset estimation performance, the present invention proposes a kind of synchronizing pilot sequence that is used for Frequency offset estimation.Fig. 2 is the discrete frequency spectral line schematic diagram according to synchronizing pilot sequence of the present invention.As shown in Figure 2, this synchronizing pilot sequence mainly is made up of two parts: a part is that power spectrum is zero discrete frequency spectral line, is called the broadband composition; Another part only comprises a discrete frequency spectral line, and promptly the single-frequency pilot tone is called the arrowband composition.
The single-frequency pilot tone that the synchronizing pilot sequence is comprised can promptly change the spectrum position of single-frequency pilot tone by the mode of frequency hopping in the synchronizing channel of each frame, thereby overcomes the frequency-selective channel decline, improves the Frequency offset estimation performance of receiving terminal.Wherein, the position of the arrowband composition in continuous a plurality of radio frames can random frequency hopping distributes, and the interval between the position of the arrowband composition in continuous a plurality of radio frames can be unequal interval, also can be equally spaced.
Preferably, the interval between the position of the arrowband composition in continuous a plurality of radio frames is greater than the coherence bandwidth of channel, thereby overcomes the Frequency offset estimation error that causes owing to the frequency-selective channel decline effectively.The highest frequency of arrowband composition may be limited within certain frequency range, and the broadband composition shows as the discrete spectrum except the single-frequency pilot tone.Like this, by the synchronizing pilot sequence that broadband composition and arrowband become to be grouped into, peak-to-average force ratio is very little, approaches the zero shellfish.
Be that example describes with three continuous radio frames below.Fig. 3 is the discrete frequency spectral line schematic diagram according to synchronizing pilot sequence in continuous three frames of the present invention.As shown in Figure 3, in three continuous radio frames, the single-frequency pilot tone that the synchronizing pilot sequence is comprised can be by the mode of frequency hopping, promptly in the synchronizing channel of each frame, change the spectrum position of single-frequency pilot tone, thereby overcome the frequency-selective channel decline, improve the Frequency offset estimation performance of receiving terminal.In Fig. 3, L1 represents the frequency interval between the single-frequency pilot tone on radio frames 1 and the radio frames 2, and L2 represents the frequency interval between the single-frequency pilot tone on radio frames 2 and the radio frames 3.If frequency interval L1 between the single-frequency pilot tone and L2, just can overcome the Frequency offset estimation error that causes owing to the frequency-selective channel decline effectively greater than the channel coherence bandwidth.
Though more than be that example is illustrated with three frames, yet in fact the single-frequency pilot tone can also be arranged in the above frequency hopping of three frames, wherein the frequency interval between the single-frequency pilot tone can be identical, also can be inequality.
Fig. 4 is the schematic diagram according to synchronizing pilot structure of the present invention.In Fig. 2, H1 and H2 are two sections identical sequences, are used for carrying out timing and estimate synchronously; The H3 sequence is used for carrying out Frequency offset estimation.Wherein, sequence H3 just can adopt the synchronizing pilot sequence of the invention described above, that is to say that sequence H3 is made up of two parts: a part is that power spectrum is zero discrete frequency spectral line, just broadband composition; Another part only comprises a discrete frequency spectral line, and promptly the single-frequency pilot tone is called the arrowband composition.
At synchronizing pilot sequence of the present invention, the invention provides the generation system of synchronizing pilot sequence, synchronizing pilot sequence generation system as shown in Figure 5 comprises:
The baseband signal sequence generating unit is used to generate the baseband signal sequence;
Power adjustment unit, be used for the baseband signal sequence that the baseband signal sequence generating unit is generated be multiply by different coefficients respectively, the power that makes the pairing discrete spectral line of a part of baseband signal sequence is zero, and the pairing discrete spectral line of another part baseband signal sequence is the single-frequency pilot tone; Such as, coefficient a1 can be zero, thereby makes that the power of the pairing discrete spectral line of a part of baseband signal sequence is zero.
Multiplexing Unit is multiplexed with a circuit-switched data with the baseband signal sequence of power adjustment unit output and sends the random frequency hopping unit to;
The random frequency hopping unit is used for the spectrum position in the synchronizing channel randomly changing single-frequency pilot tone of each frame;
The synchronizing pilot sequence generating unit is used for generating the synchronizing pilot sequence according to the data behind the random frequency hopping;
Wherein the baseband signal sequence generating unit is connected with power adjustment unit, and power adjustment unit is connected with Multiplexing Unit, and Multiplexing Unit is connected with the random frequency hopping unit, and the random frequency hopping unit is connected with the synchronizing pilot sequence generating unit.
Wherein, the baseband signal sequence generating unit among Fig. 5 can comprise: arrowband composition generation unit, and being used to export described power is the zero pairing baseband signal sequence of discrete spectral line; Broadband composition generation unit is used to export the pairing baseband signal sequence of discrete spectral line of described single-frequency pilot tone.
Fig. 6 is the schematic flow sheet according to the method for the generation synchronizing pilot sequence of the embodiment of the invention.As shown in Figure 6, this method may further comprise the steps:
Step 601: generate the baseband signal sequence;
Step 602: the baseband signal sequence be multiply by different coefficients respectively, and the power that makes the pairing discrete spectral line of a part of baseband signal sequence is zero, and the pairing discrete spectral line of another part baseband signal sequence is the single-frequency pilot tone;
, preferably have only a single spectral line on the discrete spectrum of single-frequency pilot frequency sequence here, and power to be zero discrete spectral line can be many, wherein the highest frequency of single-frequency pilot tone can be limited within certain frequency range.
Step 603: the baseband signal sequence is multiplexed with a circuit-switched data, and in the synchronizing channel of each frame the spectrum position of randomly changing single-frequency pilot tone;
Here, the position of the arrowband composition in continuous a plurality of radio frames can distribute by random frequency hopping.Between the position of the arrowband composition in continuous a plurality of radio frames is unequal interval at interval.Interval between the position of the arrowband composition in continuous a plurality of radio frames is greater than the coherence bandwidth of channel.
Step 604: generate the synchronizing pilot sequence according to the data behind the random frequency hopping.
Here, preferably road multiplex data behind the random frequency hopping that receives is converted to the multidiameter delay data, then multichannel data is mapped on each subcarrier with certain rule, undertaken sending parallel serial conversion unit output to behind the inverse-Fourier transform by the IFFT/IDFT unit again, thereby generate the synchronizing pilot sequence, consequent synchronizing pilot sequence peak-to-average force ratio is very little, approaches the zero shellfish.Alternatively, can also be in string and conversion, IFFT/IDFT process and go here and there and carry out the frequency hopping operation in the transfer process.That is to say that the random frequency hopping operation can be carried out any time after multiplexing.
Above method goes for various communication systems, is particularly useful for ofdm communication system.It will be appreciated by those of skill in the art that the present invention is suitable equally for other multi-carrier communications systems.
Fig. 7 is the demonstrative structure schematic diagram of synchronizing pilot sequence generation system according to an embodiment of the invention.Suppose that herein this communication system is an ofdm communication system.As shown in Figure 7, this system comprises: comprise continuous successively string and converting unit, map unit, IFFT/IDFT unit, parallel serial conversion unit;
The circuit-switched data that string and converting unit are used for receiving is converted to the multidiameter delay data, map unit is used for the multidiameter delay data are mapped to each subcarrier with certain rule, and the IFFT/IDFT unit is used to carry out send parallel serial conversion unit output to behind the inverse-Fourier transform; This system also comprises:
The baseband signal sequence generating unit is used to generate the baseband signal sequence;
Power adjustment unit, be used for the baseband signal sequence that the baseband signal sequence generating unit is generated be multiply by different coefficients respectively, the power that makes the pairing discrete spectral line of a part of baseband signal sequence is zero, and the pairing discrete spectral line of another part baseband signal sequence is the single-frequency pilot tone;
Multiplexing Unit is multiplexed with a circuit-switched data with the baseband signal sequence of power adjustment unit output and sends string and converting unit to;
Random frequency hopping control logic device is used for sending the random frequency hopping order to map unit, and map unit is further used for the spectrum position according to described random frequency hopping order randomly changing single-frequency pilot tone in the synchronizing channel of each frame.
Preferably, wherein the baseband signal sequence generating unit comprises:
Broadband composition generation unit, being used for output amplitude is the zero pairing baseband signal sequence of discrete spectral line;
Arrowband composition generation unit is used to export the pairing baseband signal sequence of discrete spectral line of single-frequency pilot tone.
Among the above embodiment, random frequency hopping control logic device sends the random frequency hopping order to map unit, by map unit again according to the spectrum position of random frequency hopping order randomly changing single-frequency pilot tone in the synchronizing channel of each frame.Yet the present invention is not limited thereto, can also be in string and conversion, IFFT/IDFT process and go here and there and carry out the frequency hopping operation in the transfer process.That is to say that the random frequency hopping operation can be carried out in any time behind multiplexing the finishing.Therefore, random frequency hopping control logic device can correspondingly be connected respectively to string and converting unit or IFFT/IDFT unit or parallel serial conversion unit, to send the random frequency hopping order.
More than this sentence ofdm system be example invention has been described, but it will be appreciated by those of skill in the art that the present invention is suitable equally for other multi-carrier communications systems.With OFDM is that example only describes to exemplary, and is not used in and limits the invention.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (17)
1, the synchronizing pilot sequence generation system in a kind of communication system is characterized in that this system comprises:
The baseband signal sequence generating unit is used to generate the baseband signal sequence;
Power adjustment unit, be used for the baseband signal sequence that the baseband signal sequence generating unit is generated be multiply by different coefficients respectively, the power that makes the pairing discrete spectral line of a part of baseband signal sequence is zero, and the pairing discrete spectral line of another part baseband signal sequence is the single-frequency pilot tone;
Multiplexing Unit is multiplexed with a circuit-switched data with the baseband signal sequence of power adjustment unit output and sends the random frequency hopping unit to;
The random frequency hopping unit is used for the spectrum position in the synchronizing channel randomly changing single-frequency pilot tone of each frame;
The synchronizing pilot sequence generating unit is used for generating the synchronizing pilot sequence according to the data behind the random frequency hopping;
Wherein the baseband signal sequence generating unit is connected with power adjustment unit, and power adjustment unit is connected with Multiplexing Unit, and Multiplexing Unit is connected with the random frequency hopping unit, and the random frequency hopping unit is connected with the synchronizing pilot sequence generating unit.
2, synchronizing pilot sequence generation system according to claim 1 is characterized in that, described baseband signal sequence generating unit comprises:
Broadband composition generation unit, being used to export described power is the zero pairing baseband signal sequence of discrete spectral line;
Arrowband composition generation unit is used to export the pairing baseband signal sequence of discrete spectral line of described single-frequency pilot tone.
3, synchronizing pilot sequence generation system according to claim 1 is characterized in that, the spectral line that described discrete spectral line is the single-frequency pilot tone is single.
4, synchronizing pilot sequence generation system according to claim 1 is characterized in that, the power of described discrete spectral line is that zero spectral line is many.
5, synchronizing pilot sequence generation system according to claim 1, it is characterized in that, described random frequency hopping unit is used for the spectrum position in the synchronizing channel randomly changing single-frequency pilot tone of each frame, makes frequency interval between the single-frequency pilot tone greater than the channel coherence bandwidth.
6, according to each described synchronizing pilot sequence generation system among the claim 1-5, it is characterized in that described communication system is an orthogonal frequency division multiplex OFDM system.
7, the synchronizing pilot sequence generating method in a kind of communication system is characterized in that, may further comprise the steps:
A, generation baseband signal sequence;
B, the baseband signal sequence be multiply by different coefficients respectively, the power that makes the pairing discrete spectral line of a part of baseband signal sequence is zero, and the pairing discrete spectral line of another part baseband signal sequence is the single-frequency pilot tone;
C, the baseband signal sequence of step B output is multiplexed with a circuit-switched data, and in the synchronizing channel of each frame the spectrum position of randomly changing single-frequency pilot tone;
D, generate the synchronizing pilot sequence according to the data behind the random frequency hopping.
8, method according to claim 7 is characterized in that, steps A comprises: generating power is the zero pairing baseband signal sequence of discrete spectral line; Generate the pairing baseband signal sequence of discrete spectral line of described single-frequency pilot tone.
9, method according to claim 7 is characterized in that, step C comprises: the spectrum position of randomly changing single-frequency pilot tone in the synchronizing channel of each frame makes frequency interval between the single-frequency pilot tone greater than the channel coherence bandwidth.
10, method according to claim 7 is characterized in that, the spectral line that described discrete spectral line is the single-frequency pilot tone is single.
11, method according to claim 7 is characterized in that, the power of described discrete spectral line is that zero spectral line is many.
12, method according to claim 7 is characterized in that, step C comprises: the spectrum position of randomly changing single-frequency pilot tone, the spectrum intervals of the single-frequency pilot tone in wherein continuous a plurality of frames is not wait.
13, method according to claim 7 is characterized in that, step C comprises: the spectrum position of randomly changing single-frequency pilot tone, the position of the single-frequency pilot tone in wherein continuous a plurality of frames are that random frequency hopping distributes.
According to each described method among the claim 7-13, it is characterized in that 14, described communication system is an ofdm system.
15, the synchronizing pilot sequence generation system in a kind of communication system comprises continuous successively string and converting unit, map unit, invert fast fourier transformation IFFT/ inverse discrete Fourier transformer inverse-discrete IDFT unit, parallel serial conversion unit;
The circuit-switched data that string and converting unit are used for receiving is converted to the multidiameter delay data, map unit is used for the multidiameter delay data are mapped to each subcarrier with certain rule, and the IFFT/IDFT unit is used for sending parallel serial conversion unit output to behind the execution of the data after the mapping inverse-Fourier transform; It is characterized in that this system also comprises:
The baseband signal sequence generating unit is used to generate the baseband signal sequence;
Power adjustment unit, be used for the baseband signal sequence that the baseband signal sequence generating unit is generated be multiply by different coefficients respectively, the power that makes the pairing discrete spectral line of a part of baseband signal sequence is zero, and the pairing discrete spectral line of another part baseband signal sequence is the single-frequency pilot tone;
Multiplexing Unit is multiplexed with a circuit-switched data with the baseband signal sequence of power adjustment unit output and sends string and converting unit to;
Random frequency hopping control logic device is used for sending the random frequency hopping order to map unit, and map unit is further used for the spectrum position according to described random frequency hopping order randomly changing single-frequency pilot tone in the synchronizing channel of each frame;
Wherein random frequency hopping control logic device is connected with map unit.
16, synchronizing pilot sequence generation system according to claim 15 is characterized in that, described baseband signal sequence generating unit comprises:
Broadband composition generation unit, being used to export described amplitude is the zero pairing baseband signal sequence of discrete spectral line;
Arrowband composition generation unit is used to export the pairing baseband signal sequence of discrete spectral line of described single-frequency pilot tone.
17, according to claim 15 or 16 described synchronizing pilot sequence generation systems, it is characterized in that described communication system is an ofdm system.
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2006
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