CDMA系统的一种自适应多用户检测方法

常规的匹配滤波器接收机无法克服ＣＤＭＡ的多址干扰和远近效应，因而限制了ＣＤＭＡ系统的容量．为此，需要采用干扰抑制和自适应处理的多用户检测技术．已有的很多抗远近效应和干扰抑制的多用户接收机都比较复杂，还要求估计干扰用户的信号参量．该文提出一种简化的自适应最小均方误差多用户检测接收方法，可以用自适应方式实现滤波器参数的最小均方误差意义上的最优化．理论分析与数字模拟的结果表明该方法与匹配滤波器相比，能明显地提高抗多址干扰能力

A Minimum Mean Square Error Adaptive Multi User Detector of DS CDMA

The capacity of the CDMA system is limited by the conventional matched filter receiver which suffers from near far problems of CDMA interferences. Multi user detection schemes previously proposed mitigate the near far problem, but are complex and require explicit knowledge or estimates of the interference parameters. This paper proposes a simplified MMSE adaptive multi user detector, which can be implemented adaptively when interference parameters are unknown or time varying. Numerical results are provided that show that this scheme offers significant performance gains relative to the matched filter receiver.