CN101873295B  Signal processing method and device as well as signal receiving method and receiving machine  Google Patents
Signal processing method and device as well as signal receiving method and receiving machine Download PDFInfo
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 CN101873295B CN101873295B CN 201010213449 CN201010213449A CN101873295B CN 101873295 B CN101873295 B CN 101873295B CN 201010213449 CN201010213449 CN 201010213449 CN 201010213449 A CN201010213449 A CN 201010213449A CN 101873295 B CN101873295 B CN 101873295B
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信号处理方法与装置及信号接收方法与接收机 The signal processing method and apparatus and a signal receiving method and a receiver
技术领域 FIELD
[0001] 本发明涉及正交频分复用（OFDM, Orthogonal FrequencyDivisionMultiplexing)技术，特别涉及OFDM系统中的信号处理方法与装置及信号接收方法与接收机。 [0001] The present invention relates to an orthogonal frequency division multiplexing (OFDM, Orthogonal FrequencyDivisionMultiplexing) technology, and more particularly to OFDM signal processing system method and apparatus and a signal receiving method and receiver.
背景技术 Background technique
[0002] 现有技术中的OFDM系统基本原理如下：在发送端，高速数据流经串并转换成为多个低速子数据流；使用这些低速子数据流的频域数据符号、利用IFFT调制相应的子载波， 多个经调制的子载波的合成信号定义为一个OFDM符号；再进行并串转换，并在转换后的串行信号中的每两个OFDM符号之间插入循环前缀（CP，Cyclic Prefix)，以消除子载波之间的干扰；最后进行数模转换后发射；在接收端，执行与发送端相反的操作过程。 [0002] The basic principles of the prior art OFDM system is as follows: the transmitting side, the highspeed serial data stream is converted into a plurality of lowspeed subdata stream; the frequency domain data symbols using the lowspeed subdata stream using a respective modulation IFFT subcarriers, subcarrier signal is defined synthesized as a plurality of modulated OFDM symbols; then serial conversion, and inserting a cyclic prefix (CP in the serial signal converted in between every two OFDM symbols, cyclic prefix ), to eliminate interference between subcarriers; after the last transmit digital to analog conversion; at the receiving end, the transmitting end performs the reverse operation of the process.
[0003] 针对OFDM系统中的多个小区，由于小区内的各个信号之间是正交的，所以很好的解决了小区内干扰的问题，但是作为代价，小区间干扰比码分多址（CDMA, CodeDivisionMultiple Access)系统更加严重。 [0003] OFDM system for a plurality of cells, since the individual signals within a cell are orthogonal, so that a good solution to the problem of intracell interference, but as the expense of intercell interference than the code division multiple access ( CDMA, CodeDivisionMultiple Access) system is more severe.
[0004] 当在使用频率复用的多小区环境中利用空时链接时，由于相邻小区有可能使用相同的时频资源，链接将遭受到同信道干扰，即占用相同时频资源的用户之间形成的干扰。 [0004] When used in the linked space utilizing frequency reuse multicell environment, since the adjacent cells it is possible to use the same frequency resources, the link will suffer cochannel interference, i.e., the same frequency resources occupied by the user of the formed between the interference. 以单输入多输出（SIMO, Single input multiple output)链接，即发送端有一个发射天线、接收端有两个接收天线为例，假设小区A中包括基站A和终端A，终端A向基站A发送信号时，基站A的接收端将终端A视为期望用户，相邻小区B中包括基站B和终端B，终端B和终端A使用相同的时频资源，基站A的接收端将终端B视为干扰用户。 To single input multiple output (SIMO, Single input multiple output) link, i.e., there is one transmit antenna transmitting end, the receiving end there are two receiving antennas as an example, assume that cell A includes a base station A and the terminal A, the terminal A to the base station A signal, the base station a receiving side terminal a user considered desirable, the neighboring cell B includes a base station B and the terminal B, the terminal a and the terminal B use the same frequency resource, the base station a receiving side terminal B will be considered interfere with the user. 图I为现有技术中使用SIMO链接的OFDM系统中的接收机原理框图。 Figure I is a schematic block diagram of a receiver used in the prior art link SIMO OFDM system.
[0005] 如图I所示，模数转换模块对两个接收天线接收的两路信号分别进行模数转换；去除CP模块，针对模数转换模块输出的两路信号，分别去除每两个OFDM符号间的CP ；FFT模块，对去除CP模块处理后的两路信号进行FFT处理，得到两路数据；信道估计模块，针对FFT处理后的两路数据分别估计出信道响应；频域均衡模块，根据信道估计对两路接收数据进行最大比合并，完成接收信号的检测；解调解码模块，对频域均衡模块检测后的信号进行解调解码等一系列处理，估计出发射端的发射信号。 [0005], the analog to digital conversion module two signals received by two receive antennas separately in FIG ADC I; CP removing module, for the two signals outputted from analogdigital conversion modules, respectively, every two OFDM removed CP intersymbol; FFT module for twoway signal CP removal module for processing FFT processing, to obtain twoway data; channel estimation module for twoway data after FFT processing are estimated channel response; frequency domain equalization module, the two channel estimation maximum ratio combining reception data, the reception completion detecting signal; demodulating and decoding module, the signal after the frequency domain equalization detection module and a series of demodulation and decoding process, an estimate of the emitted signal transmitting end.
[0006] 在实际应用中，基站A的两个接收天线将不仅接收到终端A发送的信号，还会接收到小区B中使用相同时频资源的终端B发送的信号，这时终端B对于终端A来说就是干扰用户，造成同信道干扰。 [0006] In practice, the two receiving antennas to the base station A not only receives the signal transmitted from the terminal A, cell B also receive signals using the same timefrequency resources, the terminal B is transmitted, then the terminal B to the terminal A user who is interference, causing cochannel interference.
[0007] 可以看出，目前OFDM系统中的接收机，并没有针对抑制同信道干扰的对应模块，同信道干扰的抑制主要是借鉴CDMA系统中相类似的方法，即将相邻小区的干扰用户和本小区的期望用户以多址的方式实现空时联合检测。 [0007] As can be seen, the current OFDM receiver in the system, and not for the cochannel interference suppression module corresponding to suppress cochannel interference in a CDMA system is mainly similar to the reference method, i.e. the neighboring cell and interfering users this cell joint detection of the user to achieve a desired spacetime in a multiple access manner. 一方面，采用空时联合检测的方法，根据空时信号处理的原理，假设接收端有η个接收天线，能抑制的同信道干扰的个数为η1，受到接收天线个数的限制，并不能抑制所有的同信道干扰；另一方面，需估计出所有干扰用户的信道响应，这是非常困难的。 In one aspect, the joint detection method of spacetime, spacetime signal processing in accordance with principles of [eta] is assumed that the receiving end has a receiving antenna, the number can be suppressed in the cochannel interference is η1, is limited by the number of receiving antennas, did not inhibit all cochannel interference; on the other hand, for an interference estimate for all users channel response, which is very difficult. 发明内容 SUMMARY
[0008] 本发明提供一种OFDM系统中的信号处理方法，该方法能够在接收端的处理过程中抑制同信道干扰，实现简单且可抑制的同信道干扰个数不受接收天线个数的限制。 [0008] The present invention provides a signal processing method in an OFDM system, the method capable of suppressing cochannel interference in the process of the receiving end, a simple and can suppress the number of cochannel interference limits the number of antennas is not received.
[0009] 本发明提供一种OFDM系统中的信号接收方法，该方法能够在接收端的处理过程中抑制同信道干扰，实现简单且可抑制的同信道干扰个数不受接收天线个数的限制，并同时降低信号接收处理的难度和计算量。 [0009] The present invention provides a signal receiving method in an OFDM system, the method capable of suppressing cochannel interference in the process of the receiving end, a simple and possible to suppress the number of cochannel interference limits the number of antennas is not received, and the difficulty and the amount of computation processing while reducing the received signal.
[0010] 本发明提供一种OFDM系统中的信号处理装置，该装置能够在接收端的处理过程中抑制同信道干扰，实现简单且可抑制的同信道干扰个数不受接收天线个数的限制。 [0010] The present invention provides a signal processing apparatus in an OFDM system, the apparatus can suppress cochannel interference in the process of the receiving end, a simple and can suppress the number of cochannel interference limits the number of antennas is not received.
[0011] 本发明提供一种OFDM系统中的接收机，该接收机能够在自身处理过程中抑制同信道干扰，实现简单且可抑制的同信道干扰个数不受接收天线个数的限制，并同时降低信 [0011] The present invention provides an OFDM system receiver which can suppress cochannel interference in the process itself, simple and can suppress the number of cochannel interference limits the number of antennas is not received, and while reducing letter
号接收处理的难度和计算量。 No difficulty receiving and processing computation.
[0012] 本发明技术方案是这样实现的： [0012] aspect of the present invention is implemented as follows:
[0013] 一种OFDM系统中的信号处理方法，应用于OFDM系统中具有两个以上接收天线的接收端，所述接收端执行的FFT得到对应接收天线的两路以上数据；关键在于，该方法包括以下合并步骤： [0013] A signal processing method in an OFDM system, the OFDM system is applied to a receiving end having two or more receive antennas, the receiving end performs an FFT to obtain two or more data corresponding to the receiving antenna; critical that the method merging step comprises:
[0014] 针对每路数据提取接收导频； [0014] extracts the received pilot channel for each of the transactions;
[0015] 针对每路数据将提取的接收导频与期望用户的发送导频进行互相关； [0015] crosscorrelation for each received pilot channel data with a desired transmission frequency the extracted pilot for guiding the user;
[0016] 针对每两路数据将提取的接收导频进行互相关； [0016] Frequency for crosscorrelating two received pilot channel for each of the extracted data;
[0017] 利用互相关的结果确定合并加权权值； Results [0017] The crosscorrelation to determine a weighted combined weight;
[0018] 使用所述合并加权权值合并所述两路以上数据。 [0018] The combined use of the combined weights of the weighting two or more data.
[0019] 一种OFDM系统中的信号接收方法，对两个以上接收天线接收到的信号依次执行模数转换、去除CP和FFT，输出对应接收天线的两路以上数据；关键在于，该方法还包括： Signal receiving method [0019] An OFDM system, two or more receive antennas of the received signal sequentially performs analog to digital conversion, CP removal and an FFT, two or more receive antennas corresponding to the output data; critical in that the method further include:
[0020] 针对每路数据提取接收导频； [0020] extracts the received pilot channel for each of the transactions;
[0021] 针对每路数据将提取的接收导频与期望用户的发送导频进行互相关； [0021] The crosscorrelation for each received pilot channel data with a desired transmission frequency the extracted pilot for guiding the user;
[0022] 针对每两路数据将提取的接收导频进行互相关； [0022] Frequency for crosscorrelating two received pilot channel for each of the extracted data;
[0023] 利用互相关的结果确定合并加权权值； Results [0023] crosscorrelation to determine a weighted combined weight;
[0024] 使用所述合并加权权值合并所述两路以上数据； [0024] The combined use of the combined weights of the weighting two or more transactions;
[0025] 对合并后的数据依次执行信道估计、频域均衡和解调解码，估计出期望用户的发射信号。 [0025] The combined data are sequentially performs channel estimation, frequency domain equalization and demodulation and decoding to estimate the expected transmit signal of the user.
[0026] 一种OFDM系统中的信号处理装置，应用于OFDM系统中具有两个以上接收天线的接收端，所述接收端的FFT模块输出对应接收天线的两路以上数据；关键在于，该装置包括： [0026] The signal processing apparatus in an OFDM system, applied to the OFDM system having a receiving terminal for receiving two or more antennas, two FFT module of the receiving end corresponding to the output data more receive antennas; wherein the key, the apparatus comprising :
[0027] 导频提取单元，针对每路数据提取接收导频； [0027] The pilot extraction unit extracts the received pilot channel for each of the transactions;
[0028] 互相关单元，针对每路数据将提取的接收导频与期望用户的发送导频进行互相关；针对每两路数据将提取的接收导频进行互相关； [0028] The crosscorrelation means for crosscorrelation of the extracted data for each channel received pilot transmitted with a desired pilot for guiding the user; frequency for crosscorrelating two received pilot channel for each of the extracted data;
[0029] 合并权值确定单元，利用互相关单元得出的结果确定合并加权权值； [0029] The combined weight value determination unit, by using the results obtained crosscorrelation unit determines a weighted combined weight;
[0030] 第一合并单元，使用所述合并加权权值合并所述两路以上数据。 [0030] a first combining unit, the combined use of the combined weights of weighting two or more data.
[0031] 一种OFDM系统中的接收机，关键在于，该接收机包括：两个以上接收天线、模数转换模块、去除CP模块、FFT模块、信号处理装置、信道估计模块、频域均衡模块和解调解码模块； [0031] A receiver in an OFDM system, wherein the key, the receiver comprising: two or more receiving antennas, analog to digital conversion module, the module removes the CP, an FFT module, a signal processing apparatus, a channel estimation module, a frequency domain equalization module demodulating and decoding module;
[0032] 所述模数转换模块，分别对每个接收天线接收的信号进行模数转换； [0032] The analog to digital conversion module, respectively, each signal receiving antennas analog to digital conversion;
[0033] 所述去除CP模块，分别去除所述模数转换模块输出的每路数据中每两个符号间的循环如缀； [0033] The CP removal modules, respectively, removing the cyclic data channel between each of the analog to digital conversion module in each of the two output symbols are as conjugate;
[0034] 所述FFT模块，分别对所述去除CP模块输出的每路数据执行FFT ； [0034] The FFT module, respectively, performs the FFT on the CP removing Each data module output;
[0035] 所述信号处理装置，针对所述FFT模块输出的每路数据，分别提取接收导频；针对所述FFT模块输出的每路数据将提取的接收导频与期望用户的发送导频进行互相关；针对所述FFT模块输出的每两路数据将提取的接收导频进行互相关；利用互相关结果确定合并加权权值；使用合并加权权值合并FFT模块输出的两路以上数据； [0035] The signal processing apparatus, the data for each channel output from FFT module, were extracted from the received pilot; each received pilot channel data for the output of the FFT module and the extracted frequency desired user transmits pilots cross correlation; each received pilot data for the two channels of the FFT module outputs the extracted frequency crosscorrelation; combined crosscorrelation result of the determination weighted weights; combined use of two or more data weighted combined weights FFT module output;
[0036] 所述信道估计模块，针对所述信号处理装置输出的合并后数据估计出信道响应； [0036] The channel estimation module to estimate the channel response for the combined signal outputted from the data processing apparatus;
[0037] 所述频域均衡模块，根据所述信道估计模块得出的信道估计对所述信号处理装置输出的合并后的数据进行检测； [0037] The frequency domain equalization module, according to the channel estimation module to estimate derived channel data processing apparatus outputs the combined signal is detected;
[0038] 所述解调解码模块，对所述频域均衡模块检测后的数据进行解调解码，估计出期望用户的发射信号。 [0038] The demodulation and decoding module, the data after the frequency domain equalization detection module demodulation and decoding, estimation of the desired transmit signal of the user.
[0039] 可见，本发明提供的OFDM系统中的信号处理方法与装置及信号接收方法与接收机，在接收端具备两个以上接收天线、及接收端的FFT处理得到对应接收天线的两路以上数据的情况下，针对每路数据提取接收导频，并将提取的接收导频与期望用户的发送导频进行互相关、及将每两路数据的接收导频进行互相关。 [0039] visible, a signal processing method and a signal receiving method and apparatus for an OFDM system receiver according to the present invention is provided in the receiving end is provided with two or more receive antennas, and the receiver FFT processing to give two receive antennas corresponding to the above data in the case where, for each extracted data received pilot channel, and the extracted received pilot transmitted with the desired user guide pilot crosscorrelation, the received pilot and data channel frequency of each of two crosscorrelated. 进行互相关就是消除各路数据与期望用户的发射信号之间的差异，因此利用互相关结果确定出的合并权值所合并出的数据，其与期望用户发射信号之间的差异最小，即在接收端的合并处理过程中抑制了同信道干扰，相比于现有技术中以多址方式实现的空时联合检测，无需知道干扰用户的任何信息，实现非常简单，并且可抑制的同信道干扰个数不受接收天线个数的限制。 Crosscorrelation is to eliminate the difference between the ways of data transmission with a desired user signal, so that crosscorrelation result of the determination of the combined weight of the combined data, the minimum difference between the desired user signal transmission, i.e. the combined process of the receiving end suppressing cochannel interference as compared to joint detection space when the prior art in a multiple access manner, and without knowing anything interfering users, achieve a very simple and can suppress cochannel interference months the number is not restricted number of receiving antennas. 进一步，由于在信道估计和频域均衡操作之前已将两路以上频域信号进行了合并，信道估计和频域均衡操作时只需针对一路数据，降低了处理难度和计算量。 Further, since the estimation and before frequency domain equalization operation has more than two signals in the frequency domain merged channel, channel estimation and frequency domain equalization operate only way for data, and the difficulty of reducing the amount of calculation processing.
附图说明 BRIEF DESCRIPTION
[0040] 图I为现有技术中使用SMO链接的OFDM系统中的接收机原理框图； [0040] Figure I a schematic block diagram of a receiver using link SMO prior art OFDM system;
[0041] 图2为本发明OFDM系统中的信号处理方法的流程图； [0041] FIG 2 is a flowchart of a signal processing method in an OFDM system of the present invention;
[0042] 图3为本发明OFDM系统中的信号处理方法的实施例的流程图； Flowchart of an embodiment [0042] FIG 3 A signal processing method in an OFDM system of the present invention;
[0043] 图4为本发明OFDM系统中的信号处理装置的结构示意图； [0043] FIG. 4 is a schematic configuration of a signal processing apparatus in an OFDM system of the present invention;
[0044] 图5为本发明OFDM系统中的接收机的结构示意图。 [0044] FIG. 5 schematic structural diagram of a receiver of the present invention an OFDM system.
具体实施方式 Detailed ways
[0045] 以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内，所做的任何修改、等同替换、改进等，均应包含在本发明保护的范围之内。 [0045] The foregoing is only preferred embodiments of the present invention but are not intended to limit the present invention, all within the spirit and principle of the present invention, any changes made, equivalent substitutions and improvements should be included within the scope of protection of the present invention.
[0046] 在详细介绍本发明的技术方案之前，先简要介绍导频符号辅助的信道估计。 [0046] Prior to the detailed description of the technical solution of the present invention, a brief description of the pilot symbol assisted channel estimation. 具体来说，OFDM系统的发送端和接收端事先约定发送导频在发送信号中插入的数量和位置，在发送端一侧，按照约定向待发送数据中插入发送导频，在接收端一侧，从接收信号中的对应位置提取接收导频。 Specifically, the transmitting and receiving ends OFDM system prior agreement number and location of transmit pilot signal inserted in the transmission, the transmission terminal side, by convention to be inserted into the transmission data transmitting pilots at the receiving end side extracting a pilot from the receiving position corresponding to the received signal.
[0047] 上述发送端导频插入的间隔与信道的相干带宽、相干时间及具体算法有关，导频的放置必须使信道估计能够跟上信道响应的变化，而又不过多增加系统的开销。 [0047] The transmitting end pilot insertion interval of the channel coherence bandwidth, the coherence time and the specific algorithm related to pilot the placement must channel estimation can keep up with changes in the channel response, without unduly increasing system costs. 根据二维采样定理，导频插入的间隔受下列条件的约束。 Twodimensional sampling theorem, the pilot insertion interval following constrained conditions.
[0048] fDmaxToFDM Δ T ^ 1/2 ； T max Δ f Δ f — τ max Δ f/Tofdm ^ 1/2。 [0048] fDmaxToFDM Δ T ^ 1/2; T max Δ f Δ f  τ max Δ f / Tofdm ^ 1/2.
[0049] 其中，fD_是最大多普勒频移，τ_是最大多径延迟，Af= I/Twdm是子载波间隔，Λτ、Af分别是导频在时间和频率上的索引间隔，由上述条件保证导频在时间和频率上的间隔分别不超过信道相干带宽和相干时间。 [0049] wherein, FD_ is the maximum Doppler shift, τ_ is the maximum multipath delay, Af = I / Twdm is the subcarrier spacing, Λτ, Af are pilots in time and frequency interval index by the above condition ensures that pilots in time and frequency interval does not exceed the channel coherence bandwidth and the coherence time.
[0050] 图2为本发明OFDM系统中的信号处理方法的流程图，该流程应用于OFDM系统中具有两个以上接收天线的接收端，接收端执行FFT后得到对应接收天线的两路以上数据。 [0050] FIG 2 is a flowchart of a signal processing method in an OFDM system of the present invention, the process applied to the OFDM system having a receiving terminal for receiving two or more antennas, receive antennas to obtain two or more data corresponding to the receiving end performs FFT . 图2所示流程包括： Flow shown in FIG. 2 comprising:
[0051] 步骤201 :针对每路数据提取接收导频。 [0051] Step 201: extracting the received pilot channel for each data.
[0052] 步骤202 :针对每路数据将提取的接收导频与期望用户的发送导频进行互相关。 [0052] Step 202: For each received pilot channel transmitting pilot data extracted user desired frequency crosscorrelation frequency.
[0053] 本步骤中，期望用户的发送导频依照约定可以获知。 [0053] In this step, the desired user's transmitted pilot may be learned according to the agreement.
[0054] 步骤203 :针对每两路数据将提取的接收导频进行互相关。 [0054] Step 203: two for each received pilot data extracted pilot crosscorrelation.
[0055] 步骤204 :利用进行互相关的结果确定合并加权权值。 [0055] Step 204: the use of crosscorrelating result of the determination of the weighted combined weights.
[0056] 步骤205 :使用所述合并加权权值合并所述两路以上数据。 [0056] Step 205: Use the combined weight of the combined weights of two or more data.
[0057] 在步骤205之后，如果涉及OFDM系统中接收端的完整信号接收过程，可依次对合并出的数据执行信道估计、频域均衡和解调解码，估计出期望用户的发射信号。 [0057] After step 205, if the process involves the complete signal received OFDM system receiving end, may be combined sequentially the data to perform channel estimation, frequency domain equalization and demodulation and decoding to estimate the expected transmit signal of the user.
[0058] 进一步，为了在计算量与合并精度之间取得合理的折衷，可以将每路数据分为Nkb个大小相同的基本资源块，位于每路数据中相同位置的各个基本资源块为一组。 [0058] Further, in order to obtain a reasonable compromise between the combined amount of computation precision, each channel may be divided into data size of substantially identical Nkb resource blocks, each located in respective substantially channel data resource blocks of the same position as a group . 设第P路数据的第RBi个基本资源块表示为(P = 1，2，......，MK，RBi = 1，2，......，Neb), The first set of data path P RBi basic resource blocks expressed as (P = 1,2, ......, MK, RBi = 1,2, ......, Neb), 
个包括个子载波和Nsymbtjl个OFDM符号，也就是一个包含iV足X 个时频单元，例如，3GPP LTE R8的上行链路中就可以采用一个资源块（RB)的一个子帧的数据作为一个基本资源块，即一个Sg中包含12个子载波和14个OFDM符号（在扩展循环前缀时为12个OFDM符号）。 When data of one subframe including two Nsymbtjl subcarriers and OFDM symbols, i.e. iV contains a sufficient frequencyX units, e.g., uplink 3GPP LTE R8 can be employed in a resource block (RB) as a basic resource blocks, i.e. a Sg contains 12 subcarriers and 14 OFDM symbols (when the cyclic prefix 12 OFDM symbols). 相应的，将期望用户的发射数据也分为Neb个大小相同的基本资源块。 Accordingly, the desired transmission user data is also divided Neb substantially identical resource block size. 在此基础上，上述步骤201〜步骤205从第一组基本资源块开始，针对当前组基本资源块执行。 On this basis, the abovedescribed step 201~ step 205 from the first set of basic resource blocks, performing for the current set of basic resource blocks. 上述步骤205之后进一步包括：判断当前组基本资源块是否为最后一组基本资源块，如果是，将对应每一组基本资源块的合并数据块按照原始的时频域位置排列，组合出一路数据；否贝U，将当前组基本资源块的下一组基本资源块作为当前组基本资源块，返回执行所述步骤201。 After the above Step 205 further comprises: determining the current group is the last resource blocks substantially a set of basic resource blocks, if the data block corresponding to each base were combined frequency domain resource block are arranged in the original position, the combination of the data all the way ; No shell U, the next set of basic blocks of the current resource block as a basic resource set of the current set of basic resource blocks, performing the step 201 returns. 在此情况下，前文所述的信道估计、频域均衡和解调解码需在所述组合出一路数据之后再执行。 In this case, the previously described channel estimation, frequency domain equalization and demodulation is performed after decoding should be subject to a combination of the channel of data.
[0059] 下面给出本发明OFDM系统中的信号处理方法的具体实施例，在本实施例中，假设OFDM系统中的小区使用SMO空时链接。 [0059] The following specific examples are given a signal processing method of the present invention, in an OFDM system, in the present embodiment, the link is assumed that in an OFDM system using SMO empty cell.
[0060] 图3为本发明OFDM系统中的信号处理方法的实施例的流程图，该流程包括： Flowchart of an embodiment [0060] FIG 3 A signal processing method in an OFDM system of the present invention, the process comprising:
[0061] 步骤301 :从当前组基本资源块中提取接收导频。 [0061] Step 301: extracting from the current set of received pilot basic resource blocks.
[0062] 本步骤中，从第P路数据的第RBi个基本资源块中提取接收导频，按照先频率后时间或者先时间后频率的顺序排列，形成一个行向量P(p)，p(p)的维数为1XNP，Np为第P路数据中第RBi个基本资源块中的接收导频数量。 [0062] In this step, extracting from RBi basic resource blocks of the P channel data in the received pilot or first order frequency time after accordance with the first frequencytime, forming a row vector P (p), p ( p) dimension of 1XNP, Np is the number of frequency of P received pilot passage RBi basic data of resource blocks. 针对当前组中的每一个基本资源块都执行上述提取导频的操作，得到当前组基本资源块的导频行向量Pw，...... For each resource block in the current basic group are performed the extracted pilot operation, to obtain a row vector Pw pilot current set of basic resource blocks, ......
[0063] 步骤302 :针对当前组基本资源块求空间相关矩阵。 [0063] Step 302: the correlation matrix for the basic resource block group of the current space requirements.
[0064] 本步骤中，设空间相关矩阵Csm的元素为<'，（i = 1， [0064] In this step, provided the spatial correlation matrix elements Csm < ', (i = 1,
2，......Me, j = 1,2,......Μκ)，该元素表示第i路数据的第RBi个基本资源块的接收导 2, ...... Me, j = 1,2, ...... Μκ), which represents the received pilot element RBi basic resource blocks of the first data channel i
频和第j路数据的第RBi个基本资源块的接收导频的互相关性，其中的（.）H表示共轭转置。 And the frequency of received pilot RBi basic resource blocks jth frequency channel crosscorrelation data, wherein the (.) H denotes conjugate transpose. 可见，空间相关矩阵CKBi的维数为MkXMk,且根据其物理含义可知CKBi = (C·)11，因此在计算时，实际只需计算Ckm上三角位置的元素即可，进一步节省了计算量。 Visible, dimension of the spatial correlation matrix CKBi is MkXMk, and according to their physical meaning understood CKBi = (C ·) 11, in the calculation, the element can be calculated simply on the actual angular position of Ckm, further computational saving.
[0065] 步骤303 :求当前组基本资源块的空间相关矩阵CKBi的逆矩阵。 [0065] Step 303: find the current set of basic resource blocks CKBi spatial correlation matrix of the inverse matrix.
[0066] 本步骤中，求当前组基本资源块的空间相关矩阵Csm的逆矩阵（CKBi Γ1。 [0066] In this step, determine the correlation matrix Csm spatial inverse matrix (CKBi Γ1 this basic set of resource blocks.
[0067] 步骤304 :将当前组基本资源块的接收导频、与期望用户发射的对应基本资源块中的发射导频进行互相关，计算出导频导向向量发严。 [0067] Step 304: The transmit pilot received pilot current set of basic frequency resource blocks, transmit to the desired user resource block corresponding to the basic crosscorrelation of the pilot, the pilot is calculated steering vector made strict.
[0068] 本步骤中，中的元素按照如下公式计算:g，，（i = 1， [0068] In this step, the element is calculated as follows: g ,, (i = 1,
2，......，MK)，其中df'为期望用户发射的第RBi个基本资源块的发射导频行向量，df^PP(i) 2, ......, MK), where df 'guide the user to a desired emission emitted RBi of basic frequency resource block row vector, df ^ PP (i)
中的相应元素在时频域的位置是相同的。 The corresponding element position in the frequency domain are the same. g/^的维数为MkX 表示第i路数据的第RBi个基本资源块的接收导频、与期望用户发射的第RBi个基本资源块的发射导频的互相关性。 g / ^ i represents the number of dimensions of the data path of the received pilot MkX RBi basic frequency resource blocks, transmit pilot transmission of the desired user RBi basic resource blocks in the frequency of crosscorrelation.
[0069] 步骤305 :确定合并加权权值。 [0069] Step 305: determining the weighted combined weights.
[0070]本步骤中，合并加权权重按照如下公式确定JF撕=(c™)''gr。 [0070] In this step, the weighted combined weights determined according to the following equation JF tear = (c ™) '' gr. 其中，WEBi的维数为MkX I,其元素为撕严（i = 1，…，!^)。 Wherein the dimensions of WEBi MkX I, which tear Yan elements (i = 1, ...,! ^).
[0071] 步骤306 :合并当前组基本资源块中的数据。 [0071] Step 306: the data merging the basic resource block of the current group.
[0072]本步骤中，合并按照如下计算公式进行知=%% «)Η。 [0072] In this step, known merger = %% «) Η according to the following formula.
/=1 / = 1
[0073] 步骤307 :判断当前组基本资源块是否为最后一组基本资源块，如果是继续执行步骤308，否则返回执行步骤301。 [0073] Step 307: determining the basic resource block of the current group is the last group of a basic resource blocks, proceed to Step 308 if yes, otherwise returning to step 301.
[0074] 针对每一组基本资源块，重复执行上述步骤301〜306，将得到Nkb个合并资源块，然后执行步骤308。 [0074] The resource block for each basic group, repeat the above steps 301~306, the resulting combined Nkb a resource block, then step 308 is executed.
[0075] 步骤308 :将每组基本资源块合并出的合并数据块按照原始的时频域位置排列，得到一路数据e。 [0075] Step 308: the basic resources each merging block merging the data block in the original timefrequency domain locations are arranged to give way data e.
[0076] 步骤308之后，对得到的一路数据执行信道估计、频域均衡及解调解码操作，相当于单输入单输出（SISO, Single Input Single Output)链接时的处理,处理难度和复杂度大大降低。 After 308, the data on the way of performing channel estimation to obtain [0076] Step, frequency domain equalization and demodulation and decoding operation, corresponding to single input single output (SISO, Single Input Single Output) link processing, handling difficulty and complexity greatly reduce.
[0077] 上述实施例虽然以SMO链接为例，但可以理解的是，本发明OFDM系统中的信号接收方法，也适用于其他多输入多输出（MIMO, Multiple InputMultiple Output)链接。 [0077] In the above embodiment, although an example SMO link, it will be appreciated that the OFDM signal receiving method of the present invention, the system is also applicable to other multiple input multiple output (MIMO, Multiple InputMultiple Output) link.
[0078] 本发明提供的信号处理方法，可以简单称为直接矩阵求逆（DMI，DirectMatrixInversion)方法。 [0078] The signal processing method provided by the invention, may be simply referred to as a direct matrix inversion (DMI, DirectMatrixInversion) method.
[0079] 对应上述OFDM系统中的信号处理方法，本发明还提供一种OFDM系统中的信号处 [0079] The signal processing method corresponding to the abovedescribed OFDM system, the present invention also provides a signal in an OFDM system
理装置。 Processing means. [0080] 图4为本发明OFDM系统中的信号处理装置的结构示意图，该信号处理装置包括：导频提取单元、互相关单元、合并权值确定单元和第一合并单元。 [0080] FIG. 4 is a schematic configuration of a signal processing apparatus in an OFDM system of the present invention, the signal processing apparatus comprising: pilot extracting means, cross correlation unit and the combined weight of the first combining unit and the determination unit.
[0081 ] 上述导频提取单元，针对每路信号提取接收导频。 [0081] The pilot extraction unit extracts the received pilot signal for each channel.
[0082] 上述互相关单元，针对每路数据将提取的接收导频与期望用户的发送导频进行互相关；针对每两路数据将提取的接收导频进行互相关。 [0082] The crosscorrelation means for transmitting pilot received pilot channel for each extracted pilot data with a desired user frequency crosscorrelation; extract the data for each of the two crosscorrelating the received pilot.
[0083] 上述合并权值确定单元，利用互相关单元得出的结果确定合并加权权值。 [0083] The merge determining unit weight, using the results obtained crosscorrelation unit determines a weighted combined weights.
[0084] 上述第一合并单元，使用所述合并加权权值合并所述两路以上数据。 [0084] The first combining unit, the combined use of the combined weights of weighting two or more data.
[0085] 为实现本发明方法中以基本资源块为单位进行的处理过程，上述信号处理装置中的导频提取单元、互相关单元、合并权值确定单元和第一合并单元，需从第一组基本资源块开始，针对当前组基本资源块执行操作，第一合并单元得出对应当前组基本资源块的合并数据块。 [0085] In the process for the realization of a basic resource block units in the method of the present invention, the signal processing apparatus conducting the pilot extraction unit, the cross correlation unit and the combined weight of the first combining unit and the determining unit, from the first required the basic resource block group start operation performed for the current set of basic resource blocks, a first combining unit corresponding to the combined data block obtained basic current set of resource blocks. 在这种情况下，直接矩阵求逆模块中进一步包括：判断单元，在第一合并单元得出对应当前组基本资源块的合并数据块后，判断当前组基本资源块是否为最后一组基本资源块，如果是，触发第二合并单元执行操作，否则触发所述导频提取单元将当前组基本资源块的下一组基本资源块作为当前基本资源块，再执行操作；第二合并单元，将第一合并单元得到的对应每组基本资源块的合并数据块按照原始的时频域位置排列，组合为一路数据。 In this case, direct matrix inversion module further comprises: a judging unit, the first combining unit corresponding to the combined data block obtained after this set of basic resource blocks, resource blocks determined basic current group is the last set of basic resources block, if yes, trigger the second combining unit performs an operation, or the pilot extraction unit triggers the next set of basic blocks of the current resource block as a basic resource set of the current basic resource blocks, and then perform an operation; and a second combining unit, the a first combining unit corresponding to the combined data block obtained substantially each resource block in the original timefrequency domain locations are arranged into one data combination.
[0086] 为实现本发明方法中提取每组基本资源块中的接收导频，上述导频提取单元包括：提取子单元和排序子单元。 [0086] To achieve the method of the present invention to extract substantially each received pilotfrequency resource block, the abovedescribed pilot extraction unit comprises: sorting and extracting subunit subunits.
[0087] 上述提取子单元，用于从当前组基本资源块中提取接收导频。 [0087] The subextraction unit for extracting a pilot from the receiving base current group resource blocks.
[0088] 上述排序子单元，将所述提取子单元提取的接收导频，按照先频率后时间或先时间后频率的顺序排列，形成接收导频行向量P(p) (P = 1，2，......，MK)。 [0088] The sorting subunit, the received pilot extracting unit extracts frequency sub, or according to the order after the first time after the first time the frequency of the frequency, form received pilot row vector P (p) (P = 1,2 , ......, MK).
[0089] 为实现本发明方法中的两种互相关处理，上述互相关单元包括：第一互相关子单元和第二互相关子单元。 [0089] The method of the present invention to implement two crosscorrelation processing in the crosscorrelation means comprises: a first crosscorrelation subunit, and a second crosscorrelation subunit.
[0090] 上述第一互相关子单元，将当前组基本资源块的接收导频行向量、与期望用户发射的对应基本资源块中的发射导频行向量进行互相关，计算出导频导向向量g/®，该导 [0090] The first crosscorrelation subunit, the current set of received pilot resource blocks in the frequency base vectors of the line, transmit pilot resource block corresponding to substantially a desired transmission frequency in the users row vector crosscorrelation, to calculate the pilot steering vector g / ®, the guide
频导向向量中的元素为g,·=(尸⑴* [df31 Y )/N j, , (i = 1，2,......, Me) ο Frequency guide elements in the vector g, · = (dead ⑴ * [df31 Y) / N j,, (i = 1,2, ......, Me) ο
[0091] 上述第二互相关子单元，针对当前组基本资源块，求出空间相关矩阵Ckm，该空间相关矩阵中的元素为cf , Q = I，2,......Me, j = 1,2,......Me) 0 [0091] The second crosscorrelation subunit, basic resources for the current group of blocks, the spatial correlation matrix is obtained Ckm, the spatial correlation matrix elements cf, Q = I, 2, ...... Me, j = 1,2, ...... Me) 0
[0092] 为实现本发明方法中的合并加权权值确定，上述合并权值确定单元包括：空间矩阵求逆子单元和合并权值计算子单元。 [0092] To achieve the combined weights of the weighting method of the present invention is determined, on the combined weight determination unit comprises: a spatial inverse matrix calculation unit and the combined weight subunit.
[0093] 上述空间矩阵求逆子单元，对所述第二互相关子单元得出的空间相关矩阵求逆，得到空间矩阵的逆矩阵（cKBi Γ1。 [0093] The spatial inverse matrix means, inverse spatial correlation matrix of the second crosscorrelation subunit derived, to obtain an inverse matrix (cKBi Γ1 spatial matrix.
[0094] 上述合并权值计算子单元，利用所述空间矩阵的逆矩阵，计算当前组基本资源块 [0094] The combined weight calculating subunit, using the inverse matrix of the spatial matrix, calculating a current set of basic resource blocks
对应的合并加权权值妒· = (CmYg1，合并加权权值的元素为(i = 1,2,......， Corresponding element value jealous · = (CmYg1, weighted combined weights of the weighted combined weight of (i = 1,2, ......,
Mk)。 Mk).
[0095] 为实现本发明方法中针对每一组基本资源块的合并处理，上述第一合并单元包括：矩阵共轭转置子单元和合并子单元。 [0095] To achieve the combined treatment methods of the invention for each set of basic resource blocks, the first combining unit comprises: a conjugate transpose matrix of subunit and merging subunit.
[0096] 上述矩阵共轭转置子单元，对所述合并权值计算子单元得到的合并加权权值进行共轭转置。 [0096] conjugate transpose of the matrix subunit, the combined weight of the combined weighted value calculating subunit weights were obtained conjugate transpose. [0097] 上述合并子单元，利用所述矩阵共轭转置子单元得到的结果，将当前组基本资源 [0097] The merging subunit, using the result of the conjugate transpose matrix subunit obtained, the current set of basic resources
块中的数据合并为合并数据块 Data blocks combined into combined data block
[0098] 图5为本发明OFDM系统中的接收机的结构示意图，该接收机包括：两个以上接收天线、模数转换模块、去除CP模块、FFT模块、信道估计模块、频域均衡模块和解调解码模块。 [0098] FIG. 5 schematic structural diagram of a receiver of the present invention an OFDM system, the receiver comprising: two or more receiving antennas, analog to digital conversion module, the module removes the CP, an FFT module, a channel estimation module, and a frequency domain equalization module demodulation and decoding module. 本发明中的接收机还包括：图4所示的信号处理装置。 In the present invention the receiver further comprising: a signal processing apparatus shown in FIG.
[0099] 上述模数转换模块、去除CP模块、FFT模块的功能及连接关系与现有技术接收机中的相同；上述信号处理装置的内部结构及功能前文已作详细介绍，这里不再赘述；上述信道估计模块、频域均衡模块和解调解码模块分别仅需针对一路数据执行操作。 [0099] The analog to digital conversion module, the module removes the CP, the same functions and connection relation between the prior art receiver FFT module; the internal structure and functions of the signal processing means has been previously detailed description is not repeated here; said channel estimation module, a frequency domain equalization module decoding and demodulation module respectively only way for the data to perform operations.
[0100] 本发明OFDM系统中的信号处理方法与装置及信号接收方法与接收机，取得了如下效果： [0100] The signal processing method according to the present invention an OFDM system and a signal receiving method and apparatus and a receiver to obtain the following results:
[0101] I)对FFT处理后输出的多路数据进行合并，由于确定合并加权权值时利用了前文所述的互相关操作，使合并出的数据与期望用户发射数据之间的差异最小，即在接收端的合并处理过程中抑制了同信道干扰，无需知道干扰用户的任何信息，实现简单且可抑制的同信道干扰个数不受接收天线个数的限制，抑制效果也比现有技术中的联合检测要好； [0101] I) the multiplexed data outputted from the FFT processing are combined, since the operation of crosscorrelation is determined as previously described weighting combined weights of the combined data of the user desired minimum difference between the data transmission, That is suppressed merging process of the receiving end of the cochannel interference, without knowing anything interfering users, the number of simple and can suppress cochannel interference limits the number of antennas is not received, the inhibiting effect than the prior art better joint detection;
[0102] 2)在合并多路数据的过程中，设定了计算单位为基本资源块，这样在合并精度和计算量之间有一个很好的折衷； [0102] 2) during the combined multiplexed data, set as a basic unit of resource block, so that there is a good compromise between accuracy and computational combined amount;
[0103] 3)在合并多路数据的过程中，前文所述的互相关计算只涉及接收导频和发送导频，计算量不大； [0103] 3) during the combined multiplexed data, according to the foregoing relates to only the crosscorrelation the received pilot transmission and pilot little calculation;
[0104] 3)由于对FFT处理后的数据就进行了合并，后续在执行信道估计和频域均衡等处理时只需针对一路数据，降低了计算量。 [0104] 3) Since the data of the FFT processing proceeds merged, when executed subsequent channel estimation and frequency domain equalization processing such data only for the way, the amount of calculation is reduced.
[0105] 综上所述，以上仅为本发明的较佳实施例而已，并非用于限定本发明的保护范围。 [0105] In summary, the foregoing is only preferred embodiments of the present invention but are not intended to limit the scope of the present invention. 凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。 Any modification within the spirit and principle of the present invention, made, equivalent substitutions, improvements, etc., should be included within the scope of the present invention.
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