Nonisotropic Scattering Characteristic in an Alternant Tree-Blocked Viaduct Scenario on High-Speed Railway at 2.35 GHz

Rongchen Sun,Liu Liu,Tao Zhou,Zhenhui Tan,Lingwen Zhang,Cheng Tao

doi:10.1155/2014/642894

Rongchen Sun, Liu Liu + Show 4 more

Open Access

https://doi.org/10.1155/2014/642894

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Abstract

This paper presents the nonisotropic scattering characteristic of the mobile radio channel in an alternant tree-blocked viaduct scenario on high-speed railway (HSR) by real field measuring at 2.35 GHz. An angle of arrival (AOA) probability density function (PDF) is proposed for the nonuniform AOA at the mobile caused by stochastically distributed scatterers. Two Von Mises angular distributions with broad applicability are used to represent the line of sight (LOS) component and part of the scattering component in the AOA model. Based on such a PDF statistical characteristics of Ricean factor,κ, and AOA of the scattering component are modeled in LOS and obstructed line of sight (OLOS) cases, respectively. The results may give a meaningful and accurate channel model and could be utilized in HSR viaduct scenario evaluation.

Highlights

high-speed railway (HSR) is becoming a major passenger transport tool in recent years due to its large transport capacity and high conveying efficiency
In this paper we proposed a modified angle of arrival (AOA) distribution model of the received multipath signals, which combines Von Mises and uniform distribution
This model was used to fit the data obtained from a measurement campaign at 2.35 GHz employing a commercial channel sounder on ZX HSR line

Summary

Introduction

HSR is becoming a major passenger transport tool in recent years due to its large transport capacity and high conveying efficiency. The receiver inside the train can receive the scattering signals reflected by the carriage during the measurement In these papers a deterministic AOA PDF is not given and the closed form correlation function and Doppler spectrum are not deduced. A two-parameter Von Mises distribution is used to estimate the AOA PDF in nonline of sight (NLOS) environment [9], in which the measurement data have only the scattering component in line with a zero-mean complex Gaussian process. By using the Von Mises distribution, the statistical models of the Ricean factor, AOA, are extracted in this specific environment These parameters are helpful to determine the correlation function and Doppler characteristics and give advice to communication system design.

Measurement Campaign and Equipment

A Parametric Multipath Fading Model

Measurement Results and Parameters Estimation

Conclusion