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 (3): 100-103.doi: 10.13190/jbupt.200703.100.wuxg

• 研究报告 • 上一篇    下一篇

OFDM系统中的一种高精度的信道估计算法

吴晓光,张治,邓钢,张平   


  1. 北京邮电大学 电信工程学院, 北京 100876
  • 收稿日期:2006-07-29 修回日期:2006-11-04 出版日期:2007-06-30 发布日期:2007-06-30
  • 通讯作者: 吴晓光

A Channel Estimation Method of High precision in OFDM System

WU Xiaoguang, ZHANG Zhi, DENG Gang, ZHANG Ping   

  1. School of Telecommunication Engineering, Beijing University of Post and Telecommunications, Beijing 100087, China
  • Received:2006-07-29 Revised:2006-11-04 Online:2007-06-30 Published:2007-06-30
  • Contact: WU Xiaoguang

摘要:

在基于OFDM的移动通信系统中,提出一种建立在基于导频的最小二乘(least squares,LS)估计方法基础之上的高精度信道估计方法。该算法首先利用信道时域相关特性,对通过LS算法得到的信道时域冲激响应(Channel Impulse Response, CIR)估计值进行有效径提取,并将所得到的时域估计值变换到频域。然后利用信道频域相关特性,用线性最小均方误差(Linear Minimum Mean Squared Error,LMMSE)合并器对估计结果进行修正。2.4GHz频段上的仿真表明了这种基于导频的信道估计方法能够跟踪信道的时频变化,并且在一定程度上可以接近于理想信道估计的误码率性能。

关键词: OFDM, 信道估计, 信道冲击响应

Abstract:

A channel estimation method of high precision in OFDM system, based on least square (LS) algorithm, is proposed. The valid path taps are effectively chosen from the estimation value of channel impulse response (CIR) gotten by LS algorithm, according to the relationship of channel in time domain and then the time domain estimation results are transformed into frequency domain. To utilize the relationship of channel in frequency domain, a linear minimum mean square error (LMMSE) combiner is used to refine the estimation results. The simulation results in the frequency band of 2.4 GHz show that the proposed method achieves a good bit error rate (BER) performance close to the theoretical bound of ideal channel estimation.

Key words: OFDM, channel estimation, channel impulse response

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