东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2011, Vol. 32 ›› Issue (1): 32-35.DOI: -

• 论著 • 上一篇    下一篇

高精度OFDM信道估计算法

汪晋宽;王旭;许鹏;   

  1. 东北大学信息科学与工程学院;
  • 收稿日期:2013-06-19 修回日期:2013-06-19 发布日期:2013-04-04
  • 通讯作者: -
  • 作者简介:-
  • 基金资助:
    国家自然科学基金资助项目(60874108,60904035)

High-accuracy OFDM channel estimation algorithm for OFDM systems

Wang, Jin-Kuan (1); Wang, Xu (1); Xu, Peng (1)   

  1. (1) School of Information Science and Engineering, Northeastern University, Shenyang 110819, China
  • Received:2013-06-19 Revised:2013-06-19 Published:2013-04-04
  • Contact: Xu, P.
  • About author:-
  • Supported by:
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摘要： 为了降低OFDM系统经典最小均方误差(MMSE)信道估计算法的误码率(BER),提出了经带阻滤波的MMSE信道估计算法.该算法首先采用MMSE得到初始的信道估计值,再利用离散傅里叶变换的特性,将噪声和信道频率响应信息分离开来,最后通过带阻滤波器对估计算法进行滤波,进而提高系统的BER性能.仿真结果表明,在增加少量计算复杂度的情况下,在导频间隔保持不变或逐渐增加两种情况下,所提算法的估计性能始终优于经典MMSE信道估计算法.

关键词: 正交频分复用, 信道估计, 最小均方误差, 带阻滤波, 误码率

Abstract: To decrease the BER (bit error ratio) of MMSE (minimum mean square error) channel estimation algorithm for OFDM systems, an improved channel estimation algorithm by using band-stop filter is proposed. In the proposed algorithm, the initial estimate value of channel is given by MMSE. Then, the noise is separated from channel frequency response by use of the characteristics of DFT (discrete Fourier transform). Finally, the channel estimation algorithm is filtered by the band-stop filter so as to improve the system accuracy of BER performance. Simulation results showed that the performance of the proposed channel estimation algorithm is obviously better than classical MMSE channel estimation algorithm on condition that the pilot frequency interval remains unchanged or increases gradually, though the computational complexity is increased slightly.

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