STBC-OFDM系统的半盲信道估计  

Semi-blind channel estimation for STBC-OFDM systems

作　　者：吴赟[1] 罗汉文[1] 宋文涛[1] 

机构地区：[1]上海交通大学电子工程系,上海200030

出　　处：《哈尔滨工业大学学报》2007年第3期485-488,共4页Journal of Harbin Institute of Technology

基　　金：国家高技术研究发展计划资助项目(2003AA12331007);国家自然科学资金资助项目(60272079)

摘　　要：STBC-OFDM系统中进行最大释然译码需要已知信道状态信息.提出一种用于3/4速率空时分组码OFDM系统的半盲信道估计方法.首先利用此系统的结构特点引入子空间盲估计技术进行信道估计,为解决子空间方法固有的模糊性问题,提出了一种使用少量导频符号的方法来估计模糊因子.仿真结果显示,本文提出的半盲信道估计方法相对于非盲估计方法具有更高的频谱效率和更好的估计性能.Channel state information of STBC - OFDM system is required for maximum likelihood decoding. A subspace-based semi-blind method is for estimating the channels of 3/4 rate orthogonal space-time block coded OFDM systems. The channels are first estimated blindly up to an ambiguity parameter, irrespective of the underlying signal constellations. Furthermore, a method is proposed to resolve the ambiguity by using a few pilot tones. The simulation results demonstrate our proposed semi-blind estimator can achieve higher spectral efficiency and provide improved estimation performance compared to the non-blind estimator.

关 键 词：STBC—OFDM 半盲 信道估计 基于子空间 

分 类 号：TN929.5[电子电信—通信与信息系统]