CHANNEL ESTIMATION TECHNIQUE IN MULTI-ANTENNA AF RELAY COMMUNICATION SYSTEMS  

作　　者：Chen Mingxue Xu Chengqi 

机构地区：[1]College of Communication and Information, Nanjing University of Posts and Telecommunications, Nanjing 210003, China [2]Nanjing Instititue of Technology, Nanjing 211167, China

出　　处：《Journal of Electronics(China)》2011年第1期22-29,共8页电子科学学刊（英文版）

基　　金：Supported by the National Natural Science Foundation of Jiangsu province(No.08KJB510015)

摘　　要：The channel estimation technique is investigated in OFDM communication systems with multi-antenna Amplify-and-Forward(AF) relay.The Space-Time Block Code(STBC) is applied at the transmitter of the relay to obtain diversity gain.According to the transmission characteristics of OFDM symbols on multiple antennas,a pilot-aided Linear Minimum Mean-Square-Error(LMMSE) channel estimation algorithm with low complexity is designed.Simulation results show that,the proposed LMMSE estimator outperforms least-square estimator and approaches the optimal estimator without error in the performance of Symbol Error Ratio(SER) under several modulation modes,and has a good estimation effect in the realistic relay communication scenario.The channel estimation technique is investigated in OFDM communication systems with multi-antenna Amplify-and-Forward （AF） relay. The Space-Time Block Code （STBC） is applied at the transmitter of the relay to obtain diversity gain. According to the transmission characteristics of OFDM symbols on multiple antennas, a pilot-aided Linear Minimum Mean-Square-Error （LMMSE） channel estimation algorithm with low complexity is designed. Simulation results show that, the proposed LMMSE estimator outperforms least-square estimator and approaches the optimal estimator without error in the performance of Symbol Error Ratio （SER） estimation effect in the realistic relay communication under several modulation modes, and has a good scenario.

关 键 词：Channel estimation Amplify-and-Forward(AF) relay OFDM Linear Minimum Mean-Square-Error(LMMSE) 

分 类 号：TN911.22[电子电信—通信与信息系统]