Progressive iterative channel estimation in fast time-varying OFDM systems  

作　　者：YANG Rui-zhe YE Si-yang ZHANG Yan-hua SUN Yan-hua YU Richard 

机构地区：[1]College of Electronics Information and Control Engineering, Beijing University of Technology [2]Department of Systems and Computer Engineering, Carleton University

出　　处：《The Journal of China Universities of Posts and Telecommunications》2014年第4期8-14,共7页中国邮电高校学报（英文版）

基　　金：supported in part by the National Natural Science Foundation of China (61372089, 61201198)

摘　　要：Considering the joint channel estimation and data detection in time-varying orthogonal frequency division multiplexing （OFDM） and addressing transmission performance degradation induced by the severe inter-carrier interference （ICI） at very high speed, a new progressive iterative channel estimation scheme is proposed. To alleviate the error propagation of the inaccurate data due to ICI, the measurement subcarriers in the Kalman filter is designed to be extended from pilots subcarriers to all the subcarriers progressively through the iterations. Furthermore, in iteration process, the interference of the non-pilot data to the measurement subcarriers is considered to be part of noise in the modified Kalman filter, which improves the estimation accuracy. Simulation indicates that the proposed scheme improves the performance in fast time-varying situation.Considering the joint channel estimation and data detection in time-varying orthogonal frequency division multiplexing （OFDM） and addressing transmission performance degradation induced by the severe inter-carrier interference （ICI） at very high speed, a new progressive iterative channel estimation scheme is proposed. To alleviate the error propagation of the inaccurate data due to ICI, the measurement subcarriers in the Kalman filter is designed to be extended from pilots subcarriers to all the subcarriers progressively through the iterations. Furthermore, in iteration process, the interference of the non-pilot data to the measurement subcarriers is considered to be part of noise in the modified Kalman filter, which improves the estimation accuracy. Simulation indicates that the proposed scheme improves the performance in fast time-varying situation.

关 键 词：time-varying OFDM channel estimation ICI PROGRESSIVE KALMAN 

分 类 号：TN929.53[电子电信—通信与信息系统]