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

Abstract

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.