WCDMA下行LMMSE接收机算法研究

Analysis of LMMSE receivers for WCDMA downlink

最小均方误差(MMSE)准则可用在DS-CDMA系统中,能有效地消除MAI和噪声,抗远近效应的单用户接收机和MMSE接收机已成为WCDMA下行链路最有实用前景的接收机。在比较和研究了两种不同结构的LMMSE接收机后,介绍了针对瑞利衰落和多径传输信道而采用的RLS准则的WCDMA下行自适应接收机。仿真结果证实,LMMSE-Rake结构的RLS自适应接收机在严重远近效应条件下具有优良的误码率性能。

Minimum Mean Squared Error (MMSE) criterion can be used to obtain near-far resistant single-user receivers,which can efficiently elimilate MAI and noise in DS-CDMA systems, and the MMSE receiver has become the most practical receiver with promising performance in FRAMES WCDMA downlink. Two LMMSE receivers with different structures are compared in this paper, and adaptive RLS receiver is used for WCDMA downlink in Rayleigh-fading multi-path channels. The simulation results show that adaptive RLS receiver with LMMSE-RAKE structure has an excellent performance even in severe near-far situations.