JING Yuan, YIN Fu-liang, ZENG Shuo. Particle filtering based semi-blind estimation for MIMO-OFDM time-varying channel[J]. 2007, (8): 67-75.DOI:
基于粒子滤波的MIMO-OFDM时变信道半盲估计
摘要
提出一种基于粒子滤波的MIMO-OFDM时变信道半盲估计方法。首先
对粒子滤波算法进行改进
通过对采样粒子分布进行局部优化调整
提出一种局部优化粒子滤波算法。然后
将该粒子滤波算法用于MIMO-OFDM时变信道估计。由于该信道估计过程在频域进行
因而无需已知(或估计)多径信道长度。与现有时变信道半盲估计方法相比
本方法具有估计误差低、对非高斯噪声顽健性强等特点
从而有效改善了接收端的符号检测性。计算机仿真结果证明了本方法的有效性。
Abstract
A semi-blind channel estimation method based on the particle filtering was proposed for the MIMO-OFDM wireless communication system.By optimizing the particles distribution locally
the traditional particle filtering algorithm was modified
and a local optimized particle filtering was proposed.This local optimized particle filtering can achieve the low MSE
and improve the precision of the MIMO-OFDM time-varying channel estimation.Since this method was per-formed in frequency domain
it was not necessary to know(or estimate) the length of the channel.Compared with exist-ing approaches
the proposed method was more robust to the non-gauss distribution noise and the detection performance is nearly optimal.The simulation results show the effectiveness of the proposed method.