一种改进的二维导频符号辅助OFDM系统信道估计方法

The 57th IEEE Semiannual Vehicular Technology Conference, 2003. VTC 2003-Spring. Pub Date : 2003-04-22 DOI:10.1109/VETECS.2003.1207091

Z. Jianhua, Zhang Ping

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引用次数: 8

摘要

在正交频分复用(OFDM)系统中，利用导频符号(PS)来提供信道响应的精确估计。基于PS的信道响应，二维维纳滤波可以提供最优的信道估计。然而，由于PS不足，侧子载波的误码率(BER)性能明显低于其他子载波。本文观察了离散时频通道响应在频域的周期性，并推导了具有周期性的频率自相关函数(acf)。然后应用该方法求出维纳滤波的新系数。仿真结果表明，基于周期频率acf的二维维纳滤波能有效提高侧子载波信道估计的精度，是离散OFDM系统中更为精确的最优PS辅助信道估计方案。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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An improved 2-dimensional pilot-symbols assisted channel estimation in OFDM systems

In orthogonal frequency division multiplexing (OFDM) systems, the pilot-symbols (PS) are utilized to provide an accurate estimation of the channel response. Based on the channel response of PS, 2-dimensional Wiener filtering can provide the optimal channel estimation. However, for the shortage of PS the bit error rate (BER) performance of the side subcarriers obviously worse than that of the other subcarriers. In this paper the periodical character of the discrete time-frequency channel response in frequency domain is observed and the new frequency autocorrelation function (acf) with the periodical property is derived. Then it is applied to obtain the new coefficients of the Wiener filtering. Through the simulation it is verified that the 2-dimensional Wiener filtering based on the periodical frequency acf can efficiently enhance the accuracy of the channel estimation at side subcarriers and it is more accurate optimal PS assisted channel estimation scheme in discrete OFDM systems.

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来源期刊

The 57th IEEE Semiannual Vehicular Technology Conference, 2003. VTC 2003-Spring.

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