Semi-blind Channel Estimator for OFDM-STC  

作　　者：吴赟 罗汉文 宋文涛 黄建国 

机构地区：[1]Dept.of Electronic Eng.,Shanghai Jiaotong Univ. [2]Col.of Marine Eng.,Northwestern Polytechnical Univ.

出　　处：《Journal of Shanghai Jiaotong university(Science)》2007年第2期229-233,共5页上海交通大学学报（英文版）

基　　金：The National High Technology Research and Development Program(863Program)(No.2003AA12331007);The National NaturalScience Foundation of China(No.60572157)

摘　　要：Channel state information of OFDM-STC system is required for maximum likelihood decoding.A subspace-based semi-blind method was proposed for estimating the channels of OFDM-STC systems.The channels are first estimated blindly up to an ambiguity parameter utilizing the nature structure of STC,irrespective of the underlying signal constellations.Furthermore,a method was proposed to resolve the ambiguity by using a few pilot symbols.The simulation results show the proposed semi-blind estimator can achieve higher spectral efficiency and provide improved estimation performance compared to the non-blind estimator.Channel state information of OFDM-STC system is required for maximum likelihood decoding. A subspace-based semi-blind method was proposed for estimating the channels of OFDM-STC systems. The channels are first estimated blindly up to an ambiguity parameter utilizing the nature structure of STC, irrespective of the underlying signal constellations. Furthermore, a method was proposed to resolve the ambiguity by using a few pilot symbols. The simulation results show the proposed semi-blind estimator can achieve higher spectral efficiency and provide improved estimation performance compared to the non-blind estimator.

关 键 词：channel estimation OFDM-STC SEMI-BLIND subspace-based 

分 类 号：TN929.5[电子电信—通信与信息系统]