一种频率选择性衰落信道下的盲自适应去相关Rake接收机  

A blind adaptive decorrelating Rake receiver for CDMA communications over frequency-selective fading channels

作　　者：王伶[1] 焦李成[1] 刘芳[1] 

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,陕西西安710071

出　　处：《通信学报》2002年第6期42-50,共9页Journal on Communications

基　　金：国家自然科学基金资助项目(60073053);国家863计划资助项目(863-317-03-05-99)

摘　　要：多用户检测是DS-CDMA系统中的一项关键技术,而Rake接收是解决多径效应的一种有效方法。本文将基于Kalman滤波的多用户检测器与Rake接收相结合,提出了一种频率选择性衰落信道下的盲自适应去相关Rake接收机。研究结果表明,这种接收机具有较强的抑制多址干扰和克服“远一近”效应能力,并且能快速收敛。Multiple access interference(MAI) is a key problem in DS-CDMA systems. Multiuser detection method and Rake receiver have been introduced to reduce the effect of MAI and multipath respectively.In this paper, a blind adaptive decorrelating Rake receiver based on the Kalman filter is proposed. The salient features of the receiver are that it doesn't require training sequences and estimate the fading parameters in advance.With numerical simulations and performance analysis, it is shown that the receiver precedes the conventional receiver, conventional Rake receiver and blind adaptive decorrelating Rake receiver based on LMS in eliminating MAI and 'near-far' resistance. Furthermore, the receiver can converge at the steady state rapidly.

关 键 词：频率选择性衰落信道 RAKE接收机 直扩码分多址 多用户检测 多址干扰 去相关 CDMA 

分 类 号：TN914.5[电子电信—通信与信息系统]