一种基于MIMO-OFDM系统快速收敛盲信道估计方法  

Blind Channel Estimation with High Speed Convergence Based on MIMO-OFDM System

作　　者：陈国军[1] 胡捍英[1] 巴斌[1] 周游[1] 

机构地区：[1]信息工程大学,河南郑州450001

出　　处：《信息工程大学学报》2013年第6期673-679,共7页Journal of Information Engineering University

摘　　要：针对基于循环前缀(cyclic prefix,CP)的MIMO-OFDM系统,提出一种快速收敛的子空间盲信道估计方法。该方法利用循环前缀特性对信道矩阵进行重构,重构矩阵具有和Toeplitz矩阵相似的结构,利用此特殊结构结合传统子空间算法可以有效地减少算法所需数据量,进而提高了算法的收敛速度。另外,文中给出了信道盲辨识条件并进行了相应说明。仿真结果表明所提算法有效,适当选取参数可以大大提高算法收敛速度。A subspace-based blind channel estimation method with high convergence rate is pro- posed to deal with MIMO-OFDM systems which are based on cyclic prefix. It uses cyclic prefix fea- tures to restructure the channel response matrix which has a structure similar to Toeplitz matrix. The method joints the special structure and the traditional subspace algorithm in order to reduce reques- ted data amount. Consequently, the convergence speed and accuracy are improved. In addition, the conditions of blind channel identification are given and are explained. Simulation results show that the proposed scheme is efficient and suitable parameters can be used to improve the algorithm con- vergence rate.

关 键 词：MIMO-OFDM系统 盲信道估计 子空间 

分 类 号：TN911.23[电子电信—通信与信息系统]