Blind channel estimation through redundant linear precoding for OFDM systems  

作　　者：梁永明 Luo Hanwen Wu Yadong Huang Jianguo 

机构地区：[1]Department of Electronic Engineering, Shanghai Jiaotong University, Shanghai 200240, P.R.China [2]Advanced Research and Development-Centre. Sharp Electronics （Shanghai） Co.,Ltd, Shanghai 201206, P.R.China [3]College of Marine Engineering, Northwestern Polytechnical University, Xi＇an 710072, P.R.China]

出　　处：《High Technology Letters》2007年第2期150-154,共5页高技术通讯（英文版）

基　　金：Sponsored by the National Natural Science Foundation of China （No.60572157）, the High Technology Research and Development Program of China （No.2003AA123310） and Sharp Electronics（Shanghai） Co., Ltd.

摘　　要：A novel approach of blind channel estimation through redundant linear precoding for orthogonal fre-quency-division multiplexing （OFDM） is proposed. A redundant linear frequency-domain preceder is ap-plied to each pair of blocks before they enter the OFDM system. With the aid of the introduced structure, the frequency-selective channel can be identified at the receiver through auto-correlation operations, sin-gular value decomposition （SVD） and scalar ambiguity resolution. The proposed blind channel estimation method has low computation complexity and requires no prior statistical information of channel or noise. The redundant linear frequency-domain precoder is employed to identify the frequency-selective fading channels. And the proposed blind channel estimation method has high spectral efficiency because it re-quires no training sequence. Computer simulations have proved that this proposed blind channel estima- tion method can identify the frequency-selective channels perfectly and have a good performance.

关 键 词：OFDM blind channel estimation redundant linear precoding auto-correlation SVD 

分 类 号：TN911[电子电信—通信与信息系统]