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
DOI: 10.12677/HJWC.2017.72011,
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国家自然科学基金支持
作者:
狄碎虎, 卓 嘎, 魏润国, 胡东升, 姜 军, 董志诚: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
关键词:
MMSE;SAGE;OFDM;MMSE; SAGE; OFDM
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。
Abstract:
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.
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