A two-ray spectrum-approximation approach to Doppler spread estimation with robustness to the carrier frequency offset

M. Souden, S. Affes, J. Benesty
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引用次数: 2

Abstract

We propose a new simple and accurate approach to estimate the Doppler spread which is a key parameter in the context of wireless communication systems. This new approach stems from the well known fact that the crosscorrelation of the channel is a weighted summation of monochromatic plane waves (or inverse Fourier transform of its power spectral density). In the case of Doppler spread, these plane waves are locally distributed around a main frequency which is nothing but the carrier frequency offset (CFO). This special feature accounts for the Taylor series expansions that we use herein to develop a two-ray spectrum approximate model. The resulting approximation allows us to determine a new simple and accurate closed-form estimator of the Doppler spread under the unique symmetry assumption on the channelpsilas spectrum. Simulations illustrate the advantages of the proposed technique and its robustness to the CFO.
一种对载波频偏具有鲁棒性的双射线谱逼近多普勒扩频估计方法
多普勒频散是无线通信系统中的一个关键参数,本文提出了一种简单、准确的估计方法。这种新方法源于一个众所周知的事实,即信道的互相关是单色平面波的加权和(或其功率谱密度的傅里叶反变换)。在多普勒扩频的情况下,这些平面波局部分布在一个主频率附近,这个主频率只不过是载波频率偏移(CFO)。这个特殊的特征解释了我们在这里用来建立双射线谱近似模型的泰勒级数展开。所得到的近似使我们能够在独特的信道谱对称假设下,确定一种新的简单而准确的多普勒扩频封闭估计。仿真结果表明了该方法的优越性及其对CFO的鲁棒性。
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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