基于多项式模型的时频二维OFDM信道估计算法

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。

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

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-di- rected channel estimation method,the method is simple and need not know the channel correlation and signal-to-noise(SNR).The per- formance is presented in terms of MSE which is at least 15dB better than least-square(LS)algorithm in fading channel.