CS-CDMA/CP系统迭代多用户检测的密度演进分析  

Density evolution analysis of the iterative multi-user detector for CS-CDMA/CP systems

作　　者：杨建华 

机构地区：[1]上海贝尔软件有限公司,上海200080

出　　处：《光通信研究》2011年第4期66-70,共5页Study on Optical Communications

摘　　要：在有多用户干扰的情况下,为了提高多用户的循环前缀的卷积扩频码分多址(CS-CDMA/CP)系统的带宽效率,提出了一种迭代的部分多用户检测算法。文中用密度演进的分析方法阐明了干扰用户的检测质量对期望用户的影响。从分析可知,干扰用户检测的准确度是期望用户检测的根本。文中采用扩大检测窗或放弃一些检测很差的干扰用户的迭代检测的方法对部分迭代多用户检测进行了改进,改进后的算法能够在系统性能和检测器的复杂度之间进行更好地折中。For the purpose of increasing the bandwidth efficiency of the multi-user cyclic prefix convolutional spreading CS-CDMA/CP system in the condition of multi-user interference,an Iterative Partial Multi-User Detection（IPMUD） algorithm is proposed.In this paper,the influence of the detection interference of the interfering user on the desired user is explained by using the density evolution analysis approach.It can be seen from the analysis that the accuracy of the interfering user detection is essential for the desired user detection.Therefore,some modifications are made to IPMUD,e.g.： widening the detection window or abandoning the some rather bad iterative detection of the interfering users.The modified algorithm can offer better tradeoff between the system performance and detector complexity.

关 键 词：卷积扩频码分多址系统 多用户干扰 部分迭代多用户检测 密度演进分析 多径信道 

分 类 号：TN914.53[电子电信—通信与信息系统]