基于信道均衡技术的CDMA下行链路检测方法

A Data Detector Based on Channel Equalizer Designed for the Downlink of CDMA Systems

多用户检测技术应用在CDMA系统中可以有效的消除多址干扰 ,用于上行链路能体现其优越性的 ,但由于其复杂度过高 ,是不适于下行链路的 ,而传统的匹配滤波器是无法消除多址干扰的。笔者分析了CDMA系统下行链路离散系统模型 ,提出了一种适用于CDMA系统下行链路的数据检测算法。此算法由信道均衡器和匹配滤波器组成 ,信道均衡是基于迫零均衡准则。仿真实验表明此种检测方法的误码性能是大大优于传统的匹配滤波器检测的。

In code-division multiple-access (CDMA) systems,sub-optimum multi-user or joint detection algorithms have been studied recently, which are mostly designed for the uplink situation. The algorithms are too complex to implement for the downlink situation. The conventional receiver consisting of matched filters is often inefficient in eliminating MAI. The authors propose a data detection algorithm designed for downlink of CDMA systems which introduce channel equalization to eliminate MAI. It consists of a channel equalizer and code matched filter. The equalization algorithm is based on zero forcing (ZF) criterion.The performance of the algorithm is better than metched filter's and its complexity is cower than tunt of sub-optimum multi-user detection.