Complexity-reduced ICI cancellation for OFDM system over doubly-selective channels  

作　　者：席晓平 Zhang Can 

机构地区：[1]School of Information Sciences and Engineering, Graduate University of Chinese Academy of Sciences, Beijing 100049, P.R. China [2]State Key Laboratory of Information Security, Graduate University of Chinese Academy of Sciences, Beijing 100049, P.R. China [3]Institute of Electronics, Chinese Academy of Sciences, Beijing 100080, P.R. China

出　　处：《High Technology Letters》2009年第2期181-186,共6页高技术通讯（英文版）

基　　金：Supported by the National Natural Science Foundation of China (No. 60573112)

摘　　要：In doubly-selective fading wireless channel, the conventional orthogonal frequency division multi-plexing （OFDM） receivers for inter-cartier interference （ICI） compensation require extensive computations. To obtain an effective balance between performance and complexity, the whole channel response matrix was decomposed into a sequence of submatrix, and then a novel equalizer based on minimum mean square error （MMSE） criterion was presented to combat the ICI. Furthermore, a simple ordering-based decision-feedback equalizer （DFE） Was derived to exploit the temperal diversity gain offered by mobile channels. Numerical studies illustrate that although the MMSE equalizer still suffers from error floor, whereas the DICE equalizer exhibits significant performance improvement. The advantage of the proposed scheme indicates its potential applications in the future broadband wireless systems.In doubly-selective fading wireless channel,the conventional orthogonal frequency division multi-plexing(OFDM)receivers for inter-carrier interference(ICI)compensation require extensive computa-tions.To obtain an effective balance between performance and complexity,the whole channel responsematrix was decomposed into a sequence of submatrix,and then a novel equalizer based on minimum meansquare error(MMSE)criterion was presented to combat the ICI.Furthermore,a simple ordering-baseddecision-feedback equalizer(DFE)was derived to exploit the temperal diversity gain offered by mobilechannels.Numerical studies illustrate that although the MMSE equalizer still suffers from error floor,whereas the DFE equalizer exhibits significant performance improvement.The advantage of the proposedscheme indicates its potential applications in the future broadband wireless systems.

关 键 词：doubly-selective fading orthogonal frequency division multiplexing （OFDM） intercarrier interference （ICI） EQUALIZATION channel estimation 

分 类 号：TN919.3[电子电信—通信与信息系统]