基于多项式模型的时频二维OFDM信道估计算法  

A Simple Time-Frequency Channel Estimation Method for OFDM Systems Based on Polynomial Model

作　　者：刘俊琳[1] 朱近康[1] 邱玲[1] 

机构地区：[1]中国科学技术大学个人通信与扩频实验室,合肥230027

出　　处：《信号处理》2007年第2期278-282,共5页Journal of Signal Processing

摘　　要：本文提出了一种内插导频的时频二维信道估计算法,用于无线移动信道下的正交频分复用(OFDM)系统。该算法基于梳状内插的导频信号模型,采用多项式模型对信道进行拟合,从而能够精确的估计出信道信息。与时频二维维纳滤波以及自适应判决反馈的算法相比,该算法不需要预先知道信道相关矩阵以及信噪比等信道信息,简单易于实现,并且能够有效的抑制信道估计中的噪声干扰。仿真结果表明,在衰落环境下,该算法的信道估计最小方差(MSE)性能与最小二乘(LS)估计最小方差性能相比有显著提高。This paper proposes a robust pilot-assisted channel estimation method for orthogonal frequency division multiplexing （OFDM） signals in Rayleigh fading. The method is based on conventional comb pilot-assisted geometry and can accurately estimate the channel information based on polynomial mode. Comparing with two-dimension wiener filter estimation method and adaptive decision-directed channel estimation method, the method is simple and need not know the channel correlation and signal-to-noise （SNR）. The performance is presented in terms of MSE which is at least 15dB better than least-square（LS） algorithm in fading channel.

关 键 词：OFDM 信道估计 时变信道 

分 类 号：TN948.14[电子电信—信号与信息处理]