MIMO-OFDM系统中基于子空间跟踪的信道估计  

Channel Estimation in MIMO-OFDM Systems by Tracking the Delay-Subspace

作　　者：焦慧颖[1] 安建平[1] 

机构地区：[1]北京理工大学信息科学技术学院电子工程系,北京100081

出　　处：《北京理工大学学报》2007年第7期636-640,共5页Transactions of Beijing Institute of Technology

基　　金：北京市自然科学基金资助项目(4052024)

摘　　要：针对MIMO-OFDM系统,提出了一种基于子空间跟踪的时域信道估计方法.首先利用导频估计出信道的时间冲激响应,然后通过Givens旋转的时延跟踪和基于最小均方自适应滤波的幅度跟踪来提高估计精度.仿真结果表明,基于子空间跟踪的时域信道估计方法可以用来跟踪较快的衰落信道,估计精度高并且复杂度较低.A time domain channel estimation method in MIMO-OFDM systems by tracking thedelaysubspace is proposed. The time impulse response is estimated by transmitting known pilot symbols, and the estimation performance is improved by the Givens rotation based delay-subspace tracking and amplitudes tracking based on the LMS filtering. Simulations proved that the time domain channel estimation by tracking the delay-subspace can track faster fading channels, and is more accurate and yet of low complexity.

关 键 词：正交频分复用 多入多出 子空间跟踪 低秩自适应滤波 

分 类 号：TN929.5[电子电信—通信与信息系统]