北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2007, Vol. 30 ›› Issue (4): 116-119.doi: 10.13190/jbupt.200704.116.wangy

• 研究报告 • 上一篇    下一篇

一种新的MIMO-OFDM自适应信道估计算法

王毅,李利华,张平,刘泽民   

  1. (北京邮电大学 电信工程学院, 北京 100086)
  • 收稿日期:2006-08-23 修回日期:2007-04-18 出版日期:2007-08-30 发布日期:2007-08-30
  • 通讯作者: 王毅

A New Channel Estimation for MIMO-OFDM Systems

WANG Yi,LI Li-hua,ZHANG Ping,LIU Ze-min   

  1. (School of Telecommunication Engineering, Beijing University of Posts and Telecommunications, Beijing 100086, China)
  • Received:2006-08-23 Revised:2007-04-18 Online:2007-08-30 Published:2007-08-30
  • Contact: WANG Yi

摘要:

基于经典的多输入多输出正交频分复用(MIMO-OFDM)系统离散傅里叶变换(DFT)信道估计方案,提出了一种新的自适应信道参数估计算法,该算法能在一个OFDM导频符号内准确地估计出信道冲激响应、多径时延和噪声方差. 首先通过DFT信道估计得到初步估计值;然后提出了联合估计算法估计出各个接收天线上的噪声方差和多径时延,利用多径时延估计值提取信道初步估计中多径点上的信息,有效去除非多径采样点上的噪声. 仿真和分析表明,相比传统固定多径数目的估计算法,该算法能自适应地跟踪信道噪声能量和多径时延的变化,提高信道估计的精度.

关键词: 多输入多输出-正交频分复用系统, 离散傅里叶变换, 信道估计; 噪声方差估计; 多径时延估计

Abstract:

A new channel estimation algorithm for MIMO-OFDM is proposed. The channel impulse response is estimated by the conventional DFT algorithm. Adaptive channel parameters estimation is proposed to estimate the noise variance and multi-path delay profile. The estimation results are used to derive the channel impulse response on the multi-path taps and eliminate the noise on the other taps. Simulation results show that the proposed channel estimation gives better performance than conventional LS channel estimation algorithm.

Key words: multiple input multiple output-orthogonal frequency division multiplexing systems, discrete Fourier transform; channel estimation, noise variance estimation, multi-path delay estimation

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