Channel estimation for MIMO-OFDM systems in wireless mobile channels  

作　　者：陆震 Ge Jianhua 

机构地区：[1]Department of Electrical Engineering, Shanghai Jiaotong University, Shanghai 200240, P.R. China [2]State Key Laboratory of Integrated Services Networks, Xidian University, Xi＇an 710071, P.R. China

出　　处：《High Technology Letters》2008年第4期354-358,共5页高技术通讯（英文版）

基　　金：the National High Technology Research and Development Program of China(No.2006AA01Z270);the National Natural Science Foundation of China(No.60332030,60496316)

摘　　要：New training sequences and frame structure are proposed to estimate time-varying channel for multi-pie-input multiple-output and orthogonal frequency division multiplexing (MIMO-OFDM) systems.Thetraining sequences are modulatable orthogonal polyphase sequences,which have both good autocorrela-tions and cross-correlations.The channel impulse response (CIR) can be obtained by measuring the cor-relation between the received training sequence and the locally generated training sequence.The trainingsequences are used as guard interval instead of cyclic prefix,which not only improve the transmission ef-ficiency but also enable the channel estimator to track time-varying channel.The simulation results showthat the proposed method has about 2dB SNR gain over conventional methods in fast time-varying chan-nel.New training sequences and frame structure are proposed to estimate time-varying channel for multipie-input multiple-output and orthogonal frequency division multiplexing （MIMO-OFDM） systems. The training sequences are modulatable orthogonal polyphase sequences, which have both good autocorrelations and cross-correlations. The channel impulse response （CIR） can be obtained by measuring the correlation between the received training sequence and the locally generated training sequence. The training sequences are used as guard interval instead of cyclic prefix, which not only improve the transmission efficiency but also enable the channel estimator to track time-varying channel. The simulation results show that the proposed method has about 2dB SNR gain over conventional methods in fast time-varying channel.

关 键 词：MIMO OFDM channel estimation modulatabale orthogonal polyphase sequence 

分 类 号：TN929.5[电子电信—通信与信息系统]