摘要
在使用较短扩频码的CDMA系统中,多径干扰会破坏用户扩频码之间的正交性,Rake接收机性能会严重下降。本文提出了一种新的基于Rake的符号级均衡的CDMA接收机,通过分析推导出了基于最小均方误差准则的均衡系数。性能仿真结果表明这种接收机与传统的Rake接收机相比,比特误码率性能有很大的提高,可以有效抑制跨多个符号的多径干扰。
Multipath channel will destroy the orthogonality of the spreading sequences. As a result, the performance of conventional Rake receiver will degrade significantly especially when short spreading codes are used. In this paper, we propose a novel symbol level equalizer receiver based on Rake. The optimal equalization weight matrix is derived according to Minimum Mean Square Error criteria. Simulation results show that the proposed receiver can mitigate multipath interference efficiently and achieve better performance compared to conventional Rake receiver.
出处
《电路与系统学报》
CSCD
北大核心
2008年第1期115-118,共4页
Journal of Circuits and Systems
基金
国家自然科学基金资助项目(60572124)
关键词
码分多址
多径干扰
符号均衡
码片均衡
CDMA
multipath interference
symbol level equalizer
chip level equalizer
