快时变衰落信道下OFDM系统的SAGE检测算法研究  

Research on Space Alternating Generalized Expectation Maximization Detection Algorithm for OFDM Systems under Fast Fading Channels

作　　者：狄碎虎 卓嘎[1] 魏润国 胡东升 姜军[1] 董志诚[1] 

机构地区：[1]西藏大学工学院,西藏大学信息技术国家级实验教学示范中心,西藏拉萨

出　　处：《无线通信》2017年第2期89-96,共8页Hans Journal of Wireless Communications

基　　金：西藏大学区创项目(项目编号:2015QCX028);国家自然科学基金项目(项目号:61561046);西藏自治区自然科学基金重点项目(No.2015ZR-14-3);西藏大学2015年珠峰学者人才发展支持计划杰出青年学者项目资助。

摘　　要：OFDM技术可以有效地抑制多径效应的影响,从而被广泛地应用到无线通信系统中。快时变衰落信道下的OFDM系统将产生严重的子载波间干扰(ICI),从而影响系统性能。本文对快时变OFDM系统,提出一种基于空间交替广义期望最大化算法(SAGE)的信号检测算法。理论分析的实验仿真结果表明,所提SAGE算法是有效的。Orthogonal frequency division multiplexing (OFDM) technology can effectively suppress the im-pact of multipath effects, which is widely used in wireless communication systems. However, OFDM systems will lead to severe inter carrier interference (ICI) under fast time-varying fading channels, which will determine system performance. In this paper, an efficient data detection al-gorithm is proposed based on the space alternating generalized expectation maximization (SAGE) technique for OFDM systems under fast fading channels. Simulation results show that the pro-posed algorithm is effective for improving the performance of OFDM systems under fast time-  varying fading channels.

关 键 词：MMSE SAGE OFDM 

分 类 号：TN91[电子电信—通信与信息系统]