Identifying key design parameters for Monte Carlo simulation of Doppler spread channels

Paul Hirschausen, L. Davis, David Haley, Ken Lever
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引用次数: 5

Abstract

There are several approaches to the Monte Carlo simulation of a time-varying multipath radio channel with a given Doppler spectrum. This paper concentrates on a particular method in which the channel, having a discrete tapped-delay-line structure, is simulated by generating a time-varying Doppler spread channel tap for each resolvable delay path. Each channel tap is created by the addition of multiple sinusoidal echoes, where the frequency of an echo is assigned randomly based on the channel Doppler spectrum. A model of this type has three key parameters: the sampling rate, the number of sinusoidal echoes and the total number of samples used in the channel realisation. Quantitative criteria are developed which provide guidelines for selecting values of parameters in the simulator design. These criteria are illustrated by examining the performance of two simulated channels, one having the Jakes Doppler spectrum the other a Gaussian Doppler spectrum. The performance is measured in terms of a normalised root-mean-squared-error between the specified and the achieved Doppler spectra. We conclude that to keep the NRMSE of the achieved Doppler spectrum to within 10%, 200 sinusoids are sufficient, provided that a suitable sampling frequency is selected.
确定多普勒扩频信道蒙特卡罗仿真的关键设计参数
有几种方法可以对给定多普勒频谱的时变多径无线电信道进行蒙特卡罗模拟。本文重点研究了一种特殊的方法,该方法通过为每个可解析的延迟路径生成时变多普勒扩频通道抽头来模拟具有离散抽头-延迟线结构的信道。每个通道抽头由多个正弦回波叠加而成,其中回波的频率是根据通道多普勒频谱随机分配的。这种类型的模型有三个关键参数:采样率,正弦回波的数量和在信道实现中使用的样本总数。制定了定量准则,为模拟器设计中参数值的选择提供指导。这些标准通过检查两个模拟信道的性能来说明,一个具有杰克斯多普勒频谱,另一个具有高斯多普勒频谱。性能是根据指定和实现的多普勒光谱之间的标准化均方根误差来测量的。我们得出的结论是,只要选择合适的采样频率,200个正弦波就足以使所获得的多普勒频谱的NRMSE保持在10%以内。
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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