WO2007140670A1 - procédé pour réaliser une synchronisation dans un système de multiplexage par répartition orthogonale de la fréquence à entrées multiples, sorties multiples - Google Patents

procédé pour réaliser une synchronisation dans un système de multiplexage par répartition orthogonale de la fréquence à entrées multiples, sorties multiples Download PDF

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WO2007140670A1
WO2007140670A1 PCT/CN2006/003762 CN2006003762W WO2007140670A1 WO 2007140670 A1 WO2007140670 A1 WO 2007140670A1 CN 2006003762 W CN2006003762 W CN 2006003762W WO 2007140670 A1 WO2007140670 A1 WO 2007140670A1
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synchronization
preamble
time
sequence
symbol
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PCT/CN2006/003762
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Chinese (zh)
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Qiaoyan Liu
Qiuxing YÜ
Yanwen Wang
Xuelin Zhang
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Zte Corporation
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2662—Symbol synchronisation
    • H04L27/2663—Coarse synchronisation, e.g. by correlation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2657—Carrier synchronisation
    • H04L27/2659—Coarse or integer frequency offset determination and synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2657—Carrier synchronisation
    • H04L27/266—Fine or fractional frequency offset determination and synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2662—Symbol synchronisation
    • H04L27/2665—Fine synchronisation, e.g. by positioning the FFT window
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2673—Details of algorithms characterised by synchronisation parameters
    • H04L27/2675—Pilot or known symbols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2673—Details of algorithms characterised by synchronisation parameters
    • H04L27/2676—Blind, i.e. without using known symbols
    • H04L27/2678—Blind, i.e. without using known symbols using cyclostationarities, e.g. cyclic prefix or postfix

Definitions

  • the present invention relates to a multiple input multiple output (MIMO) Orthogonal Frequency Division Multiplexing (OFDM) system, and more particularly to a MIMO + OFDM system.
  • MIMO multiple input multiple output
  • OFDM Orthogonal Frequency Division Multiplexing
  • the method of synchronizing in the system belongs to the field of wireless or wired communication.
  • BACKGROUND OF THE INVENTION Multi-antenna multiple-input multiple-output (MIMO) is an efficient wireless transmission technology developed in recent years, which means that multiple transmitting antennas and receiving antennas are used at the transmitting end and the receiving end, respectively.
  • the traditional communication system is a single-input and single-out SISO system.
  • the multi-input and single-out MISO mode based on transmit diversity and receive diversity and the single-input and multi-output SIMO mode are also special cases of MIMO.
  • the basic idea of MIMO is to use multiple antennas at both the transmitting and receiving terminals, and to utilize the space-time processing technology to make full use of the independent fading characteristics between channels to improve spectrum utilization, communication quality and system capacity.
  • Foschini et al. of Bell Labs proposed a layered space-time structure (BLAST), which divides source data into several sub-data streams and encodes/modulates independently.
  • the layered space-time coding system achieves a bandwidth utilization of 42 b/s/Hz at an average signal-to-noise ratio of 21 dB. Such bandwidth utilization is unthinkable for a single-antenna single-antenna reception system.
  • OFDM is divided into several orthogonal subchannels in the frequency domain 4 bar spectrum, and the carriers of each subchannel overlap each other, which improves the spectrum utilization. Since the bandwidth of each subchannel is relatively narrow, the frequency selective channel is flat fading for each subchannel signal for the entire transmission bandwidth signal, and equalization can be performed separately for each subcarrier, which greatly simplifies the receiver structure. Because OFDM has the advantages of high spectrum utilization and equalization, it is very suitable for high-speed wired and wireless transmission, so it has been extensively studied. The rapid increase in the number of high-speed services and users has led to a sharp increase in the demand for spectrum, and the spectrum resources are limited. Therefore, we combine the two advanced technologies of MIMO and OFDM to improve spectrum utilization on the one hand and effective on the other.
  • OFDM is very sensitive to frequency offset.
  • the carrier offset must be small compared with the subcarrier spacing, otherwise the demodulation performance of OFDM will be greatly affected.
  • the frequency offset of the wireless signal may occur during transmission, such as Doppler.
  • the frequency shift, or the frequency deviation between the transmitter carrier frequency and the receiver's local oscillator, will cause the orthogonality between the sub-carriers of the OFDM system to be corrupted, resulting in interference between the sub-channels (ICI).
  • the symbol timing of the OFDM system must fall within the range allowed by the cyclic prefix (CP). Otherwise, the FFT demodulation window contains information of non-current symbols, which will cause interference between symbols.
  • the known information can also be used for synchronization analysis, such as CP information, which is the processing method of the current comparison stream. Based on the CP information, no additional resources of the system can be used for synchronization. The amount of calculation is not large.
  • the disadvantage is that the correlation peak is relatively flat, which is not conducive to the judgment, and the frequency offset estimation range is small. Therefore, a ⁇ : only as a timing coarse synchronization.
  • fine synchronization of timing is performed using a special structure of pilot/synchronization symbols.
  • Frequency synchronization uses a special preamble design for synchronization. For example, the Chinese application number that was applied for by Samsung on October 16, 2004: 200410010473.6, publication number: CN 1630283A, the method of transmitting the preamble for synchronization in the multiple-input multiple-output orthogonal frequency division multiplexing system is proposed by using CP.
  • Timing coarse synchronization, timing fine synchronization using cross-correlation, and then using the orthogonal sequence (CAZAC) to construct the preamble according to a certain special structure is capable of changing complex complex operations in timing fine synchronization to simple addition and transformation, and the performance of channel estimation is better than conventional methods.
  • the accuracy of the frequency offset estimation is limited, and each antenna needs to repeatedly transmit the same preamble sequence, which adds a lot of complexity.
  • the signal-to-noise ratio of the received signal can be increased to improve the performance of the system.
  • the method and apparatus for frequency synchronization in the patented MIMO+OFDM wireless communication system proposes to use a received signal SNR to obtain a set of weights, and in frequency synchronization. Weighting is performed on the corresponding received signal.
  • the method uses the idea of maximum ratio combining for frequency synchronization, and it is necessary to weight the received training symbols of each antenna according to their SNR calculation weights before estimating the frequency offset.
  • the method can achieve better frequency synchronization without providing channel state information (CSI) or low SNR of low fast fading channel. However, this is exchanged at the cost of a large amount of computational weight calculated by the weight, and the method is less implementable.
  • CSI channel state information
  • the technical problem to be solved by the present invention is to provide a method for implementing synchronization in a multiple input multiple output orthogonal frequency division multiplexing system, so that the MIMO+OFDM receiving system passes the cost of the system resources.
  • the complexity algorithm implements symbol synchronization, and the added time synchronization post-processing module only uses another method to replace the existing method of de-CP, without increasing the complexity, but the performance of the receiver is obviously improve.
  • the present invention provides a method for implementing synchronization in a multiple input multiple output orthogonal frequency division multiplexing system, including the following steps:
  • the transmitting end constructs a preamble/synchronization sequence, and respectively aligns the orthogonal frequency division multiplexed data symbols on different transmitting antennas with the preamble/synchronization sequence on each transmitting antenna of the structure and simultaneously transmits them;
  • the cyclic prefixes in the orthogonal frequency division multiplexing symbols are used to correlate the effective symbol lengths, and the correlation result is processed in the time domain once for the correlation sequence energy to obtain the optimal synchronization after one synchronization.
  • the preamble symbols obtained by the receiving end of the frequency offset compensation are correlated with the transmitted preamble symbols in time domain, and the maximum is utilized.
  • the value takes the remainder of the cyclic prefix length to obtain a time secondary synchronization point;
  • the signal after-processing is performed by using the time domain cyclic convolution characteristic of the orthogonal frequency division multiplexing for the received data of each transmitting antenna.
  • the preamble/synchronization sequence of step (1) must be constructed on each transmit antenna of the transmitting end, including a cyclic prefix and a PN sequence, and the preamble sequence includes a sync/preamble symbol.
  • the preamble symbols are composed of repeating PN sequences of the same length.
  • the length of the PN sequence is one of integer multiples of the length of the effective orthogonal frequency division multiplexing data.
  • the corpse represents the length of the cyclic prefix symbol
  • ⁇ is the receiving sequence.
  • the time domain one-time processing described in the step (2) is to perform the same processing on each of the owing antennas, and select any one of the maximum value and d and the maximum value as the decision threshold.
  • the step (3) includes: corresponding to each of the antennas, using the first synchronization point in the set of time synchronization points, performing time domain value sliding conjugate multiplication, and frequency-shifting the available preamble symbols It is estimated that the estimated range is [-N/2, N/2], where N is the number of times the preamble symbol is repeated in the time domain, and is selected according to the actually generated frequency offset size.
  • the frequency offset estimation is represented by the following formula:
  • N FFT is the size of the OFDM symbol
  • the signal post-processing described in step (7) is represented by the following formula: Time_ofl&et+N cp /2 : Time_ofl3 ⁇ 4et+N FFT -l, Time_ofl3 ⁇ 4et: ⁇ _ ⁇ & ⁇ + ⁇ ⁇ /2-1] wherein Time-offset is actual The estimated value of the delay plus the size of a half cyclic prefix, N FFT is the size of the orthogonal frequency division multiplexing symbol, and N eD is the size of the cyclic prefix.
  • the method for realizing synchronization in a MIMO+OFDM communication system adopts time-one synchronization, frequency offset estimation, frequency offset estimation for different antennas, equal gain (ERC) combining, and newly obtained
  • the frequency offset estimation value performs frequency offset compensation for each antenna, performs time quadratic synchronization, selects a time synchronization point for the antenna with the strongest received signal power, and selects a time secondary synchronization processing scheme, which greatly improves synchronization.
  • FIG. 1 is a schematic flowchart of a method for implementing synchronization in a MIMO + OFDM wireless system according to an embodiment of the present invention
  • FIG. 2 is a time diagram of a method for implementing synchronization in a MIMO + OFDM wireless system according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a frequency offset estimation method in a method for implementing synchronization in a MIMO + OFDM wireless system according to an embodiment of the present invention
  • FIG. 1 is a schematic flowchart of a method for implementing synchronization in a MIMO + OFDM wireless system according to an embodiment of the present invention
  • FIG. 2 is a time diagram of a method for implementing synchronization in a MIMO + OFDM wireless system according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a frequency offset estimation method in a method for implementing synchronization in a MIMO + OFDM wireless system according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of a time secondary synchronization method in a method for implementing synchronization in a MIMO + OFDM wireless system according to an embodiment of the present invention
  • FIG. 5 is a time domain in a MIMO + OFDM wireless system according to an embodiment of the present invention
  • FIG. 6 is a schematic structural diagram of a time synchronization point in a MIMO + OFDM wireless system according to an embodiment of the present invention.
  • Step 110 Construct a preamble/synchronization sequence and transmit a framing on each transmit antenna.
  • the preamble/synchronization sequence that should be sent is framing and sent simultaneously.
  • Step 120 Perform time domain synchronization on each receiving antenna in combination with the CP information.
  • the time-domain primary synchronization optimization scheme is to perform correlation of effective symbol lengths based on CPs in the OFDM symbols of the receiving end, and the correlation result normalizes the correlation sequence energy, that is, time-time synchronization processing, which may be selected to be greater than 0.5 times. Any one of the maximum and less than the maximum value is the decision threshold, and the set of optimal synchronization points after one synchronization is obtained, as shown in FIG. 2 .
  • Step - Chest 130 In each of the connected t antennas, respectively, 4 or i or frequency offset estimation.
  • the preferred method for performing frequency offset estimation based on the preamble sequence is to use the first synchronization point in the set of synchronization points, perform time domain value sliding conjugate multiplication, and obtain the frequency on the ith receiving antenna by using the maximum output.
  • the partial estimate reg_q ⁇ ei(f) is shown in Figure 3.
  • Step 150 Using the preamble symbol to perform quadratic synchronization.
  • the time secondary synchronization includes In the synchronization point set of one synchronous output, the preamble symbol received after the frequency offset compensation is correlated with the transmission preamble symbol in time domain to obtain a time secondary synchronization point, as shown in Fig. 4.
  • Step-Step 160 Select The best time secondary synchronization point. Compare the correlation peaks of all receiving antennas, and select the time synchronization point of the antenna with the largest ratio of the primary peak to the secondary peak as the optimal time secondary synchronization point.
  • Step 170 Use The optimal time secondary synchronization point is subjected to post-synchronization processing. The output sequence is adjusted by using the time secondary synchronization point and the special structure of OFDM, as shown in Fig. 5.
  • the preamble/synchronization sequence comprises two parts: one is the cyclic prefix; the other is a preamble symbol consisting of PN sequences of the same length, the length of which is one of integer multiples of the length of the effective orthogonal frequency division multiplexing data. , can be 1/2, 1/4 or other values, in order to ensure that the integer multiple frequency offset of the orthogonal frequency division multiplexing system does not exceed the estimated range, the actual design of the short preamble symbol is repeated in the time domain.
  • the number of times, the preamble symbol on different transmitting antennas can be the same, if used for speech estimation, it must be ensured to be orthogonal.
  • the method of realizing synchronization uses the preamble symbol for synchronization, and the synchronous output obtains an optimal synchronization. a set of points, and select a synchronization point when there is no inter-block interference of orthogonal frequency division multiplexing symbols in the latter half of the correlation extreme value output, and the OFDM cycle is needed after the synchronization point is selected.
  • the characteristics of the prefix are post-processed, wherein, as described in step 1 10, the design of the preamble structure is as shown in Fig. 6, and the number of subcarriers is 256.
  • the output of the /t samples of the received signal is r(4), by the channel.
  • the signal and receiver noise are formed.
  • the sample signal is buffered, the buffer length is greater than one OFDM symbol, and then the buffer signal is delayed by a delay length into a correlation process to obtain time-synchronization information.
  • step 120 referring to FIG. 2, it is a schematic diagram of a time-synchronization method in a method for implementing synchronization in a MIMO+OFDM wireless system according to an embodiment of the present invention.
  • Step 210 buffering the sampled signal to obtain a buffered signal
  • Step 220 performing N-point delay on the buffered signal, and the delay time is a valid OFDM symbol time, if the corresponding sampling frequency is N times the subcarrier spacing, Then the number of delayed samples is N, otherwise it will change
  • Step 230 The buffered signal and the delayed N point signal are synchronously delivered to the correlator, and the following operations are performed: p- ⁇
  • the output of the correlator normalizes the signal power over the relevant length of time, using a normalized output and implementing a time synchronization decision via the detection device, the detection threshold being provided by the system, the synchronization error being large, especially in complex channel conditions
  • the time domain one-time synchronization is not used to implement the synchronization decision, but the possible synchronization point (the point where the correlation peak is larger) is recorded as: ⁇ : 2 , ⁇ , ⁇ as the output, and the sliding related preamble sequence
  • the time i or the second synchronization completes the final synchronization. As described in step 130, referring to FIG.
  • Step 310 Sampling the sequence buffer after one synchronization to obtain sampling data r(k);
  • Step 320 Delaying the sampling data r(c) of the sequence buffer after one synchronization by N sampling points
  • Step 330 Perform point-to-point time-domain conjugate point multiplication in a sliding window, and then correlate according to equation (3):
  • Step 340 Normalize the correlation result, where the normalization refers to normalizing the obtained value of the correlator to obtain a correlation peak. As shown in Fig. 3, the estimated value / ( 2 ⁇ ⁇ ) refers to the normalization of the frequency offset estimation value.
  • Step 350 Estimate by (4), output frequency offset estimate: an angle(z)
  • step 150 referring to FIG. 4, a schematic diagram of a time domain secondary synchronization method in a method for implementing synchronization in a MIMO+OFDM wireless system according to an embodiment is performed on each receiving antenna, and the specific process is as follows: step 510: the buffer sequence is sampled, the sampled data to obtain r (a); step 520: the possible synchronization point set ⁇ , ⁇ of the input sample data buffer and to cross-correlator, such as for formula (5) Operation:
  • Equation (6) is the transmitted preamble sequence
  • N FFT is the size of the OFDM symbol, which is the pilot sequence received after frequency offset correction.
  • the correlation process of equation (6) cannot be implemented by iteration, but its operation is limited to the range of one synchronization point set, ⁇ , ⁇ , so its computation is not very large.
  • the time sampling sequence of the received signal experiences the same fading, when the time domain secondary synchronization is at the exact synchronization point, when the equation (6) is added in phase, the correlation peak is sharp, and the maximum point is the synchronization point. In order to avoid the influence of the large delay on the received signal, the synchronization point is not accurate.
  • Step 530 Perform a synchronization decision and output an accurate synchronization point. Making full use of the pre-constructed structural design makes the synchronous correlation peak output of the method quite sharp, which is conducive to synchronous decision. At the same time, since the signal energy of the entire symbol is utilized, it works well in the case of small signal to noise ratio.
  • the MIMO + OFDM radio system according to the embodiment of the present invention is as described in step 170. Schematic diagram of the time synchronization point in the system. After the second synchronization of time, the general operation method is to directly remove the CP. However, this does not make good use of the characteristics of the OFDM cyclic prefix.
  • Time_offset is the estimated value of the actual delay plus half the size of the CP. The practical consideration is that this value can take advantage of the characteristics of the cyclic prefix to ensure that interference between symbols is not caused, but the delay estimate is not very good. Good to reduce the impact of phase deviation on performance. Therefore, after the time synchronization, you should take the following post-processing method, and then go to the CP:
  • the frequency offset actually includes not only a fractional multiple but also several integer multiples. (is an integer multiple of the subcarrier spacing).
  • the frequency stability of the system transceiver, the maximum Doppler and subcarrier spacing supported by the system are known, so it is easy to know whether the frequency offset estimation is the first case or the second according to different system parameter designs. The situation is handled differently.
  • the above method is for the synchronous processing of multiple antennas.
  • the synchronization of multiple receiving antennas is based on the processing method of one antenna. It can be roughly divided into three processing methods: It can be separated on each antenna. Processing, respectively, "time synchronization and frequency synchronization and post-synchronization processing; can also combine the results of each antenna on the equal gain or maximum ratio, especially the frequency offset estimation part, and then deal with; the simplest method is only The antenna with the strongest received signal power is time-synchronized, frequency-offset estimation, and time-synchronized, and the frequency offset compensation and the post-synchronization processing are performed on each of the antennas respectively. The specific situation is determined according to the actual system. Design selection.
  • the whole MIMO+OFDM synchronization process is divided into the following steps: constructing a preamble and framing transmission for each transmitting antenna; synchronizing the time of combining CPs with each receiving antenna; The preamble sequence performs frequency offset estimation on each receive antenna; using equal gain combining The final average frequency offset estimation value is obtained, and the frequency offset compensation is separately performed; the time domain cross correlation is respectively performed by using the preamble symbols for each receiving antenna to obtain the time domain secondary synchronization point; according to the ratio of the main peak to the secondary peak , select the best time synchronization point; perform post-synchronization processing.
  • the time-synchronization uses the CP information of OFDM to provide a possible synchronization point range for time domain secondary synchronization, and the frequency offset estimation part performs frequency offset compensation for time quadratic synchronization, and the equal gain combining can improve the accuracy of the frequency offset estimation;
  • the domain secondary synchronization part performs correlation processing on the designed preamble to obtain synchronization information. ⁇ According to the ratio of the main peak to the sub-peak, the optimal time synchronization point is selected, and the synchronization point is combined with the synchronization point, and the maximum possible result is better. Receive signal.
  • the synchronization method of the wireless MIMO+OFDM system disclosed by the invention has the following characteristics compared with the traditional method based on CP synchronization, based on multiple preamble symbols and multi-dimensional search: only one preamble symbol is needed to realize time synchronization of OFDM
  • the system resources for time synchronization are relatively small; the synchronization precision is high, the correlation peak of the secondary synchronous output in the time domain is quite sharp, the output around the maximum value is very small, and the judgment is easy, and Since the synchronization point range has been estimated in time synchronization, the time domain secondary synchronization operation is not large, and the post-synchronization processing can be adopted to improve the performance of the system; a large range of frequency offset estimation can be realized with only one short preamble symbol.

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Abstract

L'invention concerne un procédé pour réaliser une synchronisation dans un système de multiplexage par répartition orthogonale de la fréquence à entrées multiples, sorties multiples, qui comprend les étapes consistant à : construire une séquence de préambule/synchronisation pour chaque antenne de transmission et transmettre les trames générées (110); réaliser une première synchronisation temporelle pour chaque antenne de réception selon des informations de préfixes cycliques (120); réaliser une estimation de décalage de fréquence de domaine temporel d'un entier et d'un décimal avec des symboles de préambule pour chaque antenne de réception (130); réaliser une combinaison du gain uniforme à la valeur d'estimation de décalage de fréquence de chaque antenne de réception, obtenant finalement la valeur d'estimation de décalage de fréquence moyenne, et réaliser une compensation de décalage de fréquence pour les données de chaque antenne de réception (140); réaliser une seconde synchronisation temporelle avec des symboles de préambule (150); sélectionner le meilleur point de la seconde synchronisation temporelle (160); réaliser un traitement de post-synchronisation en utilisant le meilleur point de la seconde synchronisation temporelle obtenu (170).
PCT/CN2006/003762 2006-05-30 2006-12-30 procédé pour réaliser une synchronisation dans un système de multiplexage par répartition orthogonale de la fréquence à entrées multiples, sorties multiples WO2007140670A1 (fr)

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CN2006100832179A CN101083647B (zh) 2006-05-30 2006-05-30 一种多输入多输出正交频分复用***中实现同步的方法
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