利用三阶特征信息的多速率LC-DS-CDMA信号扩频码估计
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摘要
针对多速率长码直扩码分多址(LC-DS-CDMA)信号的扩频码估计问题,提出一种利用三阶相关特征信息的匹配估计法。利用m序列三阶相关函数峰值点具有唯一性的特点,构建周期与非周期多速率LC-DS-CDMA信号的三阶相关特征信息矩阵。根据接收信号的长度判断信号的周期性,估计相应接收信号的延迟三阶相关列向量。与相应的特征信息矩阵作匹配运算并对匹配结果进行归一化,完成接收信号中各用户的扩频码估计。仿真结果表明,该方法能够有效估计多速率LC-DS-CDMA信号的扩频码,相比盲源分离法具有更高的正确估计率。
Aiming at the problem of spreading code estimation of multi-rate Long Code Direct Sequence Code Division Multiple Access( LC-DS-CDM A) signal,a matching estimation method based on triple correlation feature information is proposed. Considering the uniqueness of the peak value of the triple correlation function of m-sequence,the triple correlation characteristic information matrix of periodic and aperiodic multi-rate LC-DS-CDM A signals is constructed.According to the length of the received signal,the periodicity of the received signal is judged,and the triple correlation column vector of the corresponding received signal is estimated. By matching with the corresponding characteristic information matrix and normalizing the matching results,the spreading code estimation of each user in the received signal is completed. Simulation results show that the proposed method can effectively estimate the spreading code of multi-rate LC-DS-CDM A signal,and the correct estimation rate is higher than using the blind source separation method.
Aiming at the problem of spreading code estimation of multi-rate Long Code Direct Sequence Code Division Multiple Access( LC-DS-CDM A) signal,a matching estimation method based on triple correlation feature information is proposed. Considering the uniqueness of the peak value of the triple correlation function of m-sequence,the triple correlation characteristic information matrix of periodic and aperiodic multi-rate LC-DS-CDM A signals is constructed.According to the length of the received signal,the periodicity of the received signal is judged,and the triple correlation column vector of the corresponding received signal is estimated. By matching with the corresponding characteristic information matrix and normalizing the matching results,the spreading code estimation of each user in the received signal is completed. Simulation results show that the proposed method can effectively estimate the spreading code of multi-rate LC-DS-CDM A signal,and the correct estimation rate is higher than using the blind source separation method.
引文
[1]赵军桃,张天骐,江晓磊,等.基于LEAP神经网络同步DS-CDM A伪码序列盲估计[J].计算机应用研究,2017,34(2):552-556.
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[3]吴旺军,张天骐,阳锐,等.利用二次谱盲估计多速率DS/CDM A伪码周期[J].电讯技术,2014,54(7):937-944.
[4]吴旺军,张天骐,石穗,等.多速率DS/CDMA信号扩频序列并行盲估计方法[J].信息与控制,2015,44(2):171-178.
[5]陈二阳,袁姜红,苗放,等.基于Givens旋转多用户多径DS-CDMA信号伪码盲估计[J].安徽大学学报(自然科学版),2017,41(1):67-72.
[6]WANG Q,GE Q.Blind estimation algorithm of parameters in PN sequence for DSSS-BPSK signals[C]//Proceedings of2012 International Conference on Wavelet Active Media Technology and Information Processing.Washington D.C.,USA:IEEE Press,2012:371-376.
[7]LUO Z,ZHU L.A charrelation matrix-based blind adaptive detector for DS-CDMA systems[J].Sensors,2015,15(8):20152-20168.
[8]ZHAO Z J,GU X W,QIANG F F,et al.Blind estimation of PN codes in multi-user LSC-DSSS signals[J].Journal of Communications,2017,12(1):55-61.
[9]LIANG J H,WANG X,WANG F H,et al.Blind spreading sequence estimation algorithm for long-code DS-CDMAsignals in asynchronous multi-user systems[J].IET Signal Processing,2017,11(6):704-710.
[10]苗佳佳,沈雷,郭婧婧,等.阵列天线下异步WCDMA信号的盲解码[EB/OL].[2017-08-20].http://kns.cnki.net/kcms/detail/31.1289.TP.20171027.0946.004.html.
[11]ADAMS E R,GOUDA M,HILL C J.Statistical techniques for blind detection&discrimination of msequence codes in DS/SS systems[C]//Proceedings of the 5th International Symposium on Spread Spectrum Techniques and Applications.Washington D.C.,USA:IEEE Press,1998:853-857.
[12]赵知劲,强芳芳,顾骁炜,等.利用三阶相关特征信息的周期长码扩频信号伪码盲估计[J].信号处理,2016,32(6):739-745.
[13]任啸天,徐晖,黄知涛,等.基于盲源分离的Multi-rate DS/CDM A信号扩频序列盲估计[J].航空学报,2012,33(8):1455-1465.
[14]俎云霄.基于高阶统计处理技术的m-序列检测及识别[J].电子与信息学报,2007,29(7):1576-1579.
[15]GU X W,ZHAO Z J,SHEN L.Blind estimation of pseudorandom codes in periodic long code direct sequence spread spectrum signals[J].IET Communications,2016,10(11):1273-1281.
[2]NZEZA C N,GAUTIER R,BUREL G.Blind multiuser identification in multi-rate CDM A transmissions:a new approach[C]//Proceedings of the 40th Asilomar Conference on Signals,Systems and Computers.Washington D.C.,USA:IEEE Press,2006:2162-2166.
[3]吴旺军,张天骐,阳锐,等.利用二次谱盲估计多速率DS/CDM A伪码周期[J].电讯技术,2014,54(7):937-944.
[4]吴旺军,张天骐,石穗,等.多速率DS/CDMA信号扩频序列并行盲估计方法[J].信息与控制,2015,44(2):171-178.
[5]陈二阳,袁姜红,苗放,等.基于Givens旋转多用户多径DS-CDMA信号伪码盲估计[J].安徽大学学报(自然科学版),2017,41(1):67-72.
[6]WANG Q,GE Q.Blind estimation algorithm of parameters in PN sequence for DSSS-BPSK signals[C]//Proceedings of2012 International Conference on Wavelet Active Media Technology and Information Processing.Washington D.C.,USA:IEEE Press,2012:371-376.
[7]LUO Z,ZHU L.A charrelation matrix-based blind adaptive detector for DS-CDMA systems[J].Sensors,2015,15(8):20152-20168.
[8]ZHAO Z J,GU X W,QIANG F F,et al.Blind estimation of PN codes in multi-user LSC-DSSS signals[J].Journal of Communications,2017,12(1):55-61.
[9]LIANG J H,WANG X,WANG F H,et al.Blind spreading sequence estimation algorithm for long-code DS-CDMAsignals in asynchronous multi-user systems[J].IET Signal Processing,2017,11(6):704-710.
[10]苗佳佳,沈雷,郭婧婧,等.阵列天线下异步WCDMA信号的盲解码[EB/OL].[2017-08-20].http://kns.cnki.net/kcms/detail/31.1289.TP.20171027.0946.004.html.
[11]ADAMS E R,GOUDA M,HILL C J.Statistical techniques for blind detection&discrimination of msequence codes in DS/SS systems[C]//Proceedings of the 5th International Symposium on Spread Spectrum Techniques and Applications.Washington D.C.,USA:IEEE Press,1998:853-857.
[12]赵知劲,强芳芳,顾骁炜,等.利用三阶相关特征信息的周期长码扩频信号伪码盲估计[J].信号处理,2016,32(6):739-745.
[13]任啸天,徐晖,黄知涛,等.基于盲源分离的Multi-rate DS/CDM A信号扩频序列盲估计[J].航空学报,2012,33(8):1455-1465.
[14]俎云霄.基于高阶统计处理技术的m-序列检测及识别[J].电子与信息学报,2007,29(7):1576-1579.
[15]GU X W,ZHAO Z J,SHEN L.Blind estimation of pseudorandom codes in periodic long code direct sequence spread spectrum signals[J].IET Communications,2016,10(11):1273-1281.
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