Doppler frequency spread estimation for OFDM systems in time-varying fading channel

A. Singhapan, K. Naito, K. Mori, P. Boonsrimuang, H. Kobayashi
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引用次数: 5

Abstract

In this paper, a new Doppler frequency spread estimation method based on the autocorrelation function of the estimated channel impulse response is proposed for OFDM systems in the time-varying channel. We propose a technique to separate the Doppler frequency spread in both slow and fast modes that correspond to vehicle speed. The feature of proposed method is to achieve the accurate Doppler frequency spread estimation in the low mode based on comparing and approximating the ideal autocorrelation function value with the estimated autocorrelation function at the same time index. In the fast mode, we apply the conventional Doppler frequency spread estimation based on the zero-crossing of the autocorrelation function. This paper presents various computer simulation results to verify the effectiveness of proposed Doppler frequency spread estimation method in the both of slow and fast mode condition.
时变衰落信道下OFDM系统的多普勒频宽估计
针对时变信道条件下的OFDM系统,提出了一种基于信道估计脉冲响应自相关函数的多普勒频宽估计方法。我们提出了一种技术来分离多普勒频率传播在慢速和快速模式,对应于车辆的速度。该方法的特点是通过将理想自相关函数值与估计的自相关函数同时间指标进行比较和近似,实现低模式下精确的多普勒频宽估计。在快速模式下,我们采用基于自相关函数过零的传统多普勒频宽估计。本文给出了各种计算机仿真结果,验证了所提出的多普勒频宽估计方法在慢速和快模式条件下的有效性。
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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