基于EM算法的MIMO OFDM系统信道估计  

EM-based Channel Estimation for MIMO OFDM Systemy

作　　者：胡高平[1] 程艳[1] 

机构地区：[1]中国传媒大学信息工程学院,北京100024

出　　处：《中国传媒大学学报（自然科学版）》2009年第2期21-24,共4页Journal of Communication University of China：Science and Technology

摘　　要：针对慢时变频率选择性MI MO OFDM(Multiple Input Multiple Output Orthogonal Frequency Division Multi-plexing)系统,提出一种低复杂度的信道估计算法。文中所用方法是STBC(space-ti me block coded)MI MO OFDM系统中一种基于EM(Expectation Maxi mization)的自适应信道估计技术。仿真结果显示在慢衰落环境下,随着用户数的增加,最小均方误差性能没有损失。与RLS(Recursive Least-Squares)算法比较,本文所提出的方法利用了Alamouti STBC编码结构,从而降低了计算复杂度。We propose a low complexity algorithm for channel estimation of Multiple Input Multi ple Output Orthogonal Frequency Division Multiplexing systems in slow time-varying frequency selective environment. The proposed algorithm was an adaptive channel estimation technique based on an expectation maximization algorithm for space-time block coded MIMO OFDM systems. Simulation results show that in slow fading environment there was no degradation in normalized mean square error as we increased the number of users. Comparing the Recursive LeastSquares algorithm, the proposed algorithm exploits the structure of Alamouti STBC codes to reduce computational complexity.

关 键 词：MIM0 0FDM 信道估计 EM 

分 类 号：TN911.7[电子电信—通信与信息系统]