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

无线通信 Pub Date : 2017-04-25 DOI:10.12677/HJWC.2017.72011

狄碎虎, 卓嘎, 魏润国, 胡东升, 姜军, 董志诚

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摘要

OFDM technology can effectively suppress the impact of multipath effects and is widely applied in wireless communication systems. OFDM systems in fast time-varying fading channels will generate severe inter carrier interference (ICI), which will affect system performance. This article proposes a signal detection algorithm based on the spatial alternating generalized expectation maximization algorithm (SAGE) for fast time-varying OFDM systems. The experimental simulation results of theoretical analysis show that the proposed SAGE algorithm is effective. Orthogonal frequency division multiplexing (OFDM) technology can effectively suppress the im act of multipath effects, which is widely used in wireless communication systems However, OFDM systems will lead to sever inter carrier interference (ICI) under fast time varying fading channels, which will determine system performance In this paper, an effective data detection algorithm is proposed based on the space alternative generalized expectation maximization (SAGE) technology for OFDM systems under fast fast fast 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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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

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.

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发文量

195