Time-domain channel estimator based on cyclic correlationfor OFDM systems with guard interval  

作　　者：IM Se-bin CHOI Hyung-jin 

机构地区：[1]Communication Research Center, Harbin Institute of Technology

出　　处：《The Journal of China Universities of Posts and Telecommunications》2008年第2期26-31,共6页中国邮电高校学报（英文版）

基　　金：the National Natural Science Foundation of China (60572039)and Commsys. Laborcotory of Sungkyunkwan University in Korea

摘　　要：Channel impulse response （CIR） can be estimated on the basis of cyclic correlation in time-domain for orthogonal frequency division multiplexing （OFDM） systems, This article proposes a generalized channel estimation method to reduce the estimation error by taking the average of different CIRs. Channel impulse responses are derived according to the different starting points of cyclic correlation. In addition, an effective CIR length estimation algorithm is also presented. The whole proposed methods are more effective to OFDM systems, especialiy to those with longer cyclic prefix. The analysis and the simulation results verify that the mean square error performance is 4-5 dB better than the conventional schemes under the same conditions.Channel impulse response （CIR） can be estimated on the basis of cyclic correlation in time-domain for orthogonal frequency division multiplexing （OFDM） systems, This article proposes a generalized channel estimation method to reduce the estimation error by taking the average of different CIRs. Channel impulse responses are derived according to the different starting points of cyclic correlation. In addition, an effective CIR length estimation algorithm is also presented. The whole proposed methods are more effective to OFDM systems, especialiy to those with longer cyclic prefix. The analysis and the simulation results verify that the mean square error performance is 4-5 dB better than the conventional schemes under the same conditions.

关 键 词：CIR OFDM channel estimation mean squareerror （MSE） 

分 类 号：TN919.3[电子电信—通信与信息系统]