CDMA系统中的多用户检测技术

Multiuser Detection Technique in CDMA Systems

传统的直接序列扩频 -码分多址 (DS CDMA)通信系统中 ,多址干扰 (MAI)的存在制约了系统的性能和容量。一个较好的解决办法是多用户检测。集中讨论了次佳多用户检测 (包括各种线性方案和非线性方案 ) ,给出了它们的结构 ,分析和比较了它们的性能。最后还提出了一种结合最小均方误差 (MMSE)检测的连续干扰抵消 (SIC)方案 ,其性能好于单一的SIC和MMSE检测器。

For conventional DS CDMA communication systems,multiple access interference (MAI) significantly limits its performance and capacity.A fairly good solution is multiuser detection.In this paper,we focus on suboptimal multiuser detction,including linear and nonlinear schemes,with their structures given,performance analyzed and compared.Finally,a successive interference cancellation (SIC) scheme is proposed combined with minimum mean square error (MMSE) detection.Its performance is superior to simple SIC or MMSE detector.