基于盲源分离的CDMA系统上行链路多用户检测  

Up-Link Multi-User Detection in CDMA System Based on Blind Source Separation

作　　者：付卫红[1] 杨小牛[2] 刘乃安[1] 曾兴雯[1] 

机构地区：[1]西安电子科技大学ISN国家重点试验室,西安710071 [2]通信系统信息控制技术国家级重点实验室,浙江嘉兴314033

出　　处：《北京邮电大学学报》2009年第2期111-114,共4页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金项目(60672038;60702060);高等学校学科创新引智计划项目(B08038)

摘　　要：在分析码分多址(CDMA)系统信号模型的基础上,提出了一种基于盲源分离的多用户检测算法,该算法充分利用了各用户信息之间的独立性.仿真结果表明,当信噪比一定时,该算法的误符号率是传统最小均方差(MMSE)算法的50%左右.当干扰用户与期望用户的功率比(干信比)为40 dB时,本算法的误符号率比MMSE检测算法要低2个数量级,而且干信比越高,抗远近效应性能改善的程度就越大.Based on the analysis of the signal model in code division multiple access （CDMA）system, a multi-user detection algorithm based on blind source speration （BSS） is proposed. The algorithm made full use of the independency of the user＇s information. Simulations show that, with the same signal-to-noise ratio, the symbol error ratio （SER） of the proposed is about half of that of the minimum-mean-square error （MMSE） algorithm. When the power ratio of the interference user to the expected user （or interference-to-signal ration, ISR） is 40 dB, the SER of the algorithm is two order lower than that of the MMSE algorithm. Furthermore, the higher ISR is, the greater the degree of improvement of the ability of anti-near far effect in the new algorithm.

关 键 词：码分多址 多用户检测 盲源分离 

分 类 号：TN911.7[电子电信—通信与信息系统]