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.
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
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)
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
orthogonal frequency division multiplexing （OFDM）
multi-input multi-output （MIMO）
subspace tracking
low rank adaptive filter
