MIMO-OFDM系统中一种链式加权LS信道估计算法

A Chain Weighted Averaging LS Channel Estimation for MIMO-OFDM Systems

该文对多输入多输出正交频分复用系统中的信道估计进行研究,提出了一种链式加权LS信道估计算法。该算法基于频域正交循环导频序列,首先采用LS算法获得信道响应初始估值,然后对不同时刻的信道初值进行链式加权改善信道估值。由于循环导频结构保证了任何发射天线在训练周期内所有载波位置都有导频符号可供参考,该算法能够有效地抑制"载波边界效应",提高信道估计的精度;同时它不需要信道先验信息以及矩阵求逆运算,因而实现简单。

Channel estimation for MIMO-OFDM systems is investigated, and a chain weighted averaging LS channel estimation algorithm is proposed. Based on the FDM circular pilot sequence, the new algorithm obtains a temporal channel estimation using LS algorithm, and improves the estimation performance by weighted averaging. The circular pilot structure and weighted averaging effectively decreases the effect of the carrier edges on the system＇s performance. Furthermore, avoiding the inversion of a large matrix, the new algorithm can be easily realized.