Linear Precoding Based Iterative Detection Algorithm in Asynchronous MI MO-OFDM Systems  

作　　者：Mo Taofu Liu Tian Shao Shihai Tang Youxi 

机构地区：[1]National Key Laboratory of Science and Technology on Communications,University of Electronic Science and Technology of China,Chengdu 611731,P.R.China

出　　处：《China Communications》2012年第4期63-70,共8页中国通信（英文版）

基　　金：supported by the Hi-Tech Research and Development Program of China under Grant No.2009AA01Z236;the National Natural Science Foundation of China under Grants No.60902027,No.60832007 and No.60901018;the Funds under Grant No.9140A21030209DZ02;the Fundamental Research Funds for the Central Universities under Grants No.ZYGX2009J008,No.ZYGX2009J010

摘　　要：In asynchronous Multiple-Input-Multiple-Output Orthogonal Frequency Division Multiplexing(MIMO-OFDM) over the selective Rayleigh fading channel,the performance of the existing linear detection algorithms improves slowly as the Signal Noise Ratio (SNR) increases.To improve the performance of asynchronous MIMO-OFDM,a low complexity iterative detection algorithm based on linear precoding is proposed in this paper.At the transmitter,the transmitted signals are spread by precoding matrix to achieve the space-frequency diversity gain,and low complexity iterative Interference Cancellation(IC) algorithm is used at the receiver,which relieves the error propagation by the precoding matrix.The performance improvement is verified by simulations.Under the condition of 4 transmitting antennas and 4 receiving antennas at the BER of 10-4,about 6 dB gain is obtained by using our proposed algorithm compared with traditional algorithm.In asynchronous Multiple-Input-Multiple-Output Orthogonal Frequency Division Multiplexing（MIMO-OFDM） over the selective Rayleigh fading channel,the performance of the existing linear detection algorithms improves slowly as the Signal Noise Ratio （SNR） increases.To improve the performance of asynchronous MIMO-OFDM,a low complexity iterative detection algorithm based on linear precoding is proposed in this paper.At the transmitter,the transmitted signals are spread by precoding matrix to achieve the space-frequency diversity gain,and low complexity iterative Interference Cancellation（IC） algorithm is used at the receiver,which relieves the error propagation by the precoding matrix.The performance improvement is verified by simulations.Under the condition of 4 transmitting antennas and 4 receiving antennas at the BER of 10-4,about 6 dB gain is obtained by using our proposed algorithm compared with traditional algorithm.

关 键 词：asynchronous MIMO-OFDM linear precoding ITERATION linear detection 

分 类 号：TN91[电子电信—通信与信息系统] O177.91[电子电信—信息与通信工程]