基于盲源分离的Multi-Rate DS/CDMA信号 扩频序列盲估计

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基于盲源分离的Multi-Rate DS/CDMA信号扩频序列盲估计

任啸天, 徐晖, 黄知涛, 王丰华, 陆凤波

国防科学技术大学电子科学与工程学院, 湖南长沙 410073

收稿日期:2011-10-14 修回日期:2011-11-25 出版日期:2012-08-25 发布日期:2012-08-23
通讯作者: 徐晖 E-mail:simon863@vip.sina.com
基金资助:
国家自然科学基金(61072120)

Blind Source Separation Based Blind Estimation of the Spreading Sequences for Multi-Rate DS/CDMA Signals

REN Xiaotian, XU Hui, HUANG Zhitao, WANG Fenghua, LU Fengbo

College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073,China

Received:2011-10-14 Revised:2011-11-25 Online:2012-08-25 Published:2012-08-23
Supported by:
National Natural Science Foundation of China (61072120)

摘要/Abstract

摘要： 通过分析Multi-Rate DS/CDMA信号特性,建立的Multi-Rate DS/CDMA系统模型与线性混合的盲源分离模型一致,针对异、同步信号的不同特性,提出不同循环分段降维方法:对异步系统而言,采用2倍扩频周期为间隔对接收信号进行分割,利用Fast-ICA算法盲估计同一扩频周期用户的扩频序列,基于矢量2范数基础上估计各用户失步时间,并依此截取得到各用户的实际扩频序列,然后,循环至次大扩频周期进行盲估计,同时根据估计波形相似度归一化衡量函数消除最大周期分段序列,求解次大周期用户扩频序列,直至循环结束。对同步系统则以单倍最大扩频周期为间隔对接收信号进行分割,然后进行盲估计及降维处理。理论分析和仿真结果验证了本文方法的有效性。

关键词: 变增益, Multi-Rate DS/CDMA信号, 扩频序列盲估计, 盲源分离, 非合作通信

Abstract: The characteristics of the Multi-Rate DS/CDMA signals are analyzed in this paper, and two dimension-deflation methods with different loop durations are presented in accordance with the signal characteristics in synchronous and asynchronous systems. For the asynchronous system, the received signals are divided into two-spreading-period-length temporal vectors; the Fast-ICA algorithm is used to estimate the spreading sequences blindly with the same spreading period. The estimated spreading sequences are obtained according to the desychronous time, which is calculated based on the 2-norm of vector. The normalization weight function of the estimated waveform similarity ratio is exploited to separate the spreading sequences with different spreading periods. For the synchronous system, the process is the same with the algorithm described above, except that the received signals are divided into one-spreading-period-length temporal vectors. Finally, theory analysis and simulation results demonstrate the validity of the new method.

Key words: variable spreading gain, Multi-Rate DS/CDMA signal, blind estimation of the spreading sequence, blind source separation, non-cooperative communication

中图分类号:

任啸天, 徐晖, 黄知涛, 王丰华, 陆凤波. 基于盲源分离的Multi-Rate DS/CDMA信号扩频序列盲估计[J]. 航空学报, 2012, 33(8): 1455-1465.

REN Xiaotian, XU Hui, HUANG Zhitao, WANG Fenghua, LU Fengbo. Blind Source Separation Based Blind Estimation of the Spreading Sequences for Multi-Rate DS/CDMA Signals[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2012, 33(8): 1455-1465.

参考文献

[1] Buzzi S,Lops M,Pauciullo A.Iterative cyclic subspace tracking for blind adaptive multiuser detection in multirate CDMA systems.IEEE Transactions on Vehicular Technology,2003,52(6):1463-1475.
[2] Nsiala C N,Gautier R,Burel G.Blind multiuser identification in multirate CDMA transmissions: A new approach. Conference Record of the 40th Asilomar Conference on Signals,Systems and Computers, 2006:2162-2166.
[3] Koivisto T,Koivunen V.Blind despreading of short code DS-CDMA signals in asynchronous multi-user systems. Signal Processing,2007,87(11):2560-2568.
[4] Fu W H,Yang X N,Liu N A.The multi-user detection and chip sequence estimation for CDMA system based on the blind source separation. Acta Electronica Sinica,2008,36(7):1319-1323.(in Chinese) 付卫红,杨小牛,刘乃安.基于盲源分离的CDMA多用户检测与伪码估计.电子学报,2008,36(7):1319-1323.
[5] Lu F B,Huang Z T,Jiang W L.Blind estimation of spreading sequence of CDMA signals based on Fast-ICA and performance analysis.Journal of Communications,2011,32(8):136-142.(in Chinese) 陆凤波,黄知涛,姜文利.基于Fast-ICA的CDMA信号扩频序列盲估计及性能分析.通信学报,2011,32(8):136-142.
[6] Yao Y Y,Poor H V.Blind detection of synchronous CDMA in non-Gaussian channels. IEEE Transctions on Signal Processing, 2004,52(1):271-279.
[7] Bouder C,Azou S,Burel G.Performance analysis of a spreading sequence estimator for spread spectrum transmissions.Journal of the Franklin Institute,2004,341(7): 595-614.
[8] Qiu P Y,Huang Z T,Jiang W L,et al.Improved blind-spreading sequence estimation algorithm for direct sequence spread spectrum signals.IET Signal Processing,2008,2(2):139-146.
[9] Qiu P Y,Huang Z T,Jiang W L,et al.Blind multiuser spreading sequences estimation algorithm for the direct-sequence code division multiple access signals. IET Signal Processing,2010,4(5):465-478.
[10] Zhang H G,Wei P.Blind despreading of the long-code direct sequence spread spectrum signal.2010 International Conference on Communications,Circuits and Systems.New York: IEEE, 2010:425-427.
[11] Fu P W,Chen K C.Multi-rate multi-carrier CDMA with multiuser detection for wireless multimedia communications.2003 IEEE Wireless Communication and Networking. New York: IEEE, 2003:385-390.
[12] Sacchi C,D’Orazio L,Donelli M,et al.Genetic algorithm-assisted maximum-likelihood multi-user detection for multi-rate MC-CDMA systems.DIT-07-008.Trento: University of Trento,2007.
[13] Nzeza C N,Gautier R,Burel G.Blind multiuser detection in multirate CDMA transmissions using fluctuations of correlation estimators.2006 Global Telecommunications Conference. New York: IEEE, 2006:1-5.
[14] Hyvarinen A.Fast and robust fixed-point algorithms for independent component analysis.IEEE Transactions on Neural Networks,1999,10(3):626-634.
[15] Yang X N,Yao J L,Li J D,et al.Performance analysis of the FastICA algorithm in ICA-based cochannel communication system.Proceedings of the 5th International Conference on Wireless Communication, Network and Mobile Computing,2009:2055-2058.

E-mail：hkxb@buaa.edu.cn

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基于盲源分离的Multi-Rate DS/CDMA信号扩频序列盲估计

Blind Source Separation Based Blind Estimation of the Spreading Sequences for Multi-Rate DS/CDMA Signals

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基于盲源分离的Multi-Rate DS/CDMA信号 扩频序列盲估计

Blind Source Separation Based Blind Estimation of the Spreading Sequences for Multi-Rate DS/CDMA Signals

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基于盲源分离的Multi-Rate DS/CDMA信号扩频序列盲估计