CDMA系统上行链路的分数间隔频域均衡接收方案  

Fractionally-spaced frequency domain equalization scheme for the uplink of CDMA systems

作　　者：李宝金[1] 常永宇[1] 杨大成[1] 

机构地区：[1]北京邮电大学电信工程学院,北京100876

出　　处：《电路与系统学报》2008年第2期20-25,19,共7页Journal of Circuits and Systems

基　　金：北京邮电大学-Qualcomm联合研究项目资助课题

摘　　要：提出一种应用于单载波CDMA系统异步上行链路的分数间隔频域均衡接收方案。针对异步上行链路各用户到达基站的信号具有任意随机时延的特性,为了提高CDMA系统上行链路的抗干扰能力,降低接收机检测复杂度,同时与现有单载波系统空中接口兼容,接收方案采用基于重叠截取技术的单载波分数间隔频域均衡器对抗频率选择性衰落所引起的各种干扰;用时域多阶并行干扰消除器减小用户间严重的多址干扰。仿真结果表明,这种分数间隔频域均衡接收方案比传统的码片级均衡接收方案在性能上有很大的提高,并且复杂度也比较低。In this paper, a fractionally-spaced frequency domain equalization scheme for the asynchronous uplink of single carrier CDMA system is proposed. In this scheme, the fractionally-spaced frequency domain equalizer （FSFDE） based on overlap-cut is used to combat the interferences induced by frequency selective fading channels and multistage parallel interference cancellation （MPIC） is used to eliminate the sever Multiple Access Interference （MAI） while keeping low computational complexity and could be applied to the existing single carrier air interfaces directly. Simulation results show that the proposed fractionally-spaced frequency domain equalization scheme can obtain significant performance improvement over the conventional ones while with low complexity.

关 键 词：码分多址 频域均衡 分数间隔 异步 

分 类 号：TN911.5[电子电信—通信与信息系统]