基于MCMC-UKF的直接序列扩频信号盲估计
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摘要
针对长码直接序列扩频信号的扩频码及信息序列盲估计问题,提出基于重叠分段MCMC-UKF的扩频码及信息序列联合估计算法。在贝叶斯框架模型下,结合重叠分段的思想,利用UKF算法求解非线性模型,估计各参数后验概率的均值和方差,通过MCMC方法迭代抽样得到各分段扩频序列,进行序列拼接以完成对扩频序列及信息序列的估计。仿真结果表明,该算法能适应较低的信噪比环境,且不受扩频序列类型的限制。
Aiming at the problem of spreading code and information sequence blind estimation for long code Direct Sequence Spread Spectrum(DSSS) signal,this paper proposes a joint estimation algorithm based on overlapping segment Markov Chain Monte Carlo-Unscented Kalman Filtering(MCMC-UKF) for spreading code and information sequence.Under the Bayesian framework model,combined with the idea of overlapping segmentation,the UKF algorithm is used to solve the nonlinear model,and the mean and variance of the posterior probabilities of each parameter are estimated.The segmentation spread spectrum is obtained by MCMC method,sequence splicing to complete the estimation of the spreading sequence and the information sequence.Simulation results show that the algorithm can adapt to lower Signal-to-Noise Ratio(SNR) and is not limited by the type of spread spectrum sequence.
Aiming at the problem of spreading code and information sequence blind estimation for long code Direct Sequence Spread Spectrum(DSSS) signal,this paper proposes a joint estimation algorithm based on overlapping segment Markov Chain Monte Carlo-Unscented Kalman Filtering(MCMC-UKF) for spreading code and information sequence.Under the Bayesian framework model,combined with the idea of overlapping segmentation,the UKF algorithm is used to solve the nonlinear model,and the mean and variance of the posterior probabilities of each parameter are estimated.The segmentation spread spectrum is obtained by MCMC method,sequence splicing to complete the estimation of the spreading sequence and the information sequence.Simulation results show that the algorithm can adapt to lower Signal-to-Noise Ratio(SNR) and is not limited by the type of spread spectrum sequence.
引文
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[6] WANG Qian,GE Qian.Blind estimation algorithm of parameters in PN sequence for DSSS-BPSK signals[C]//Proceedings of 2012 International Conference on Wavelet Active Media Technology and Information Processing.Chengdu,China:[s.n.],2012:371-376.
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[11] HILL P,COMLEYY V,ADAMS E.Techniques for detecting and characterizing covert communication signals[C]//Proceedings of IEEE Military Communications Conference.Monterey,USA:[s.n.],1997:1361-1365.
[12] TSATSANIS M K,GIANNAKIS G B.Blind estimation of direct sequence spread spectrum signals in multipath.Signal Processing[J].IEEE Transactions on Signal Processing,1997,45(5):1241-1252.
[13] DANESHMAND S,AGHAEINIA H,TOHIDIAN M,et al.Blind estimation of signal in periodic long-code DSSS communication[C]//Proceedings of IEEE Sarnoff Symposium.Washington D.C.,USA:IEEE Press,2009:1-6.
[14] BAI Juan,ZHANG Tianqi,ZHAO Defang,et al.PN sequence estimation of long-code DSSS signal based on virtual multiuser model[J].Telecommunication Engineering,2011,51(8):29-35.
[15] 赵军桃,张天骐,江晓磊,等.基于LEAP 神经网络的同步DS-CDMA 伪码序列盲估计[J].计算机应用研究,2016,34(2):552-556.
[16] 张天骐,赵军桃,江晓磊.基于多主分量神经网络的同步DS-CDMA伪码盲估计[J].系统工程与电子技术,2016,38(11):2638-2647.
[2] DONG Zhanqi,HU Nianying.A method for the detection of long pseudo random code DSSS signals based on the processing of delay-multiply(II)——the estimation of the information symbol period and the pseudo-random code sequence[C]//Proceedings of International Conference on Communication Technology.Hangzhou,China:[s.n.],2008:233-236.
[3] QUI P,HUANG Z,JIANG W,et al.Improved blind-spreading sequence estimation algorithm for direct sequence spread spectrum signals[J].IET Signal Process,2008,2(2):139-146.
[4] VLOK J,OLIVIER J.Blind sequence-length estimation of low-SNR cyclostationary sequences[J].IET Communications,2014,8(9):1578-1588.
[5] ZHANG Tianqi,MU Aiping.A modified eigen-structure analyzer to lower SNR DSSS signals under narrow band interferences[J].Digital Signal Process,2008,18(4):526-533.
[6] WANG Qian,GE Qian.Blind estimation algorithm of parameters in PN sequence for DSSS-BPSK signals[C]//Proceedings of 2012 International Conference on Wavelet Active Media Technology and Information Processing.Chengdu,China:[s.n.],2012:371-376.
[7] SHA Zhizhao,HUANG Zhitao,ZHOU Yiyu,et al.Blind spreading sequence estimation based on hill-climbing algorithm[C]//Proceedings of International Conference on Signal Processing.Beijing,China:[s.n.],2012:1299-1302.
[8] ZHANG H,GAN L,LIAO H,et al.Estimating spreading waveform of long-code direct sequence spread spectrum signals at a low signal-to-noise ratio[J].IET Signal Process,2012,6(4):358-363.
[9] VLOK J,OLIVAER J.Blind sequence-length estimation of low-SNR cyclostationary sequences[J].IET Communications,2014,8(9):1578-1588.
[10] WARNER S,MULGREW B,GRANT M.Triple correlation analysis of m sequences[J].Electronics Letters,1993,29(20):1755-1756.
[11] HILL P,COMLEYY V,ADAMS E.Techniques for detecting and characterizing covert communication signals[C]//Proceedings of IEEE Military Communications Conference.Monterey,USA:[s.n.],1997:1361-1365.
[12] TSATSANIS M K,GIANNAKIS G B.Blind estimation of direct sequence spread spectrum signals in multipath.Signal Processing[J].IEEE Transactions on Signal Processing,1997,45(5):1241-1252.
[13] DANESHMAND S,AGHAEINIA H,TOHIDIAN M,et al.Blind estimation of signal in periodic long-code DSSS communication[C]//Proceedings of IEEE Sarnoff Symposium.Washington D.C.,USA:IEEE Press,2009:1-6.
[14] BAI Juan,ZHANG Tianqi,ZHAO Defang,et al.PN sequence estimation of long-code DSSS signal based on virtual multiuser model[J].Telecommunication Engineering,2011,51(8):29-35.
[15] 赵军桃,张天骐,江晓磊,等.基于LEAP 神经网络的同步DS-CDMA 伪码序列盲估计[J].计算机应用研究,2016,34(2):552-556.
[16] 张天骐,赵军桃,江晓磊.基于多主分量神经网络的同步DS-CDMA伪码盲估计[J].系统工程与电子技术,2016,38(11):2638-2647.