Shadow Fading Correlation in High-Speed Railway Environments

Shadow Fading Correlation in High-Speed Railway Environments
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高速铁路环境中的阴影衰落相关性

DOI:
10.1109/tvt.2014.2351579
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发表时间:
2015-07
影响因子:
6.8
通讯作者:
Oestges Claude
Oestges Claude
中科院分区:
计算机科学2区
文献类型:
--
作者:
He Ruisi;Zhong Zhangdui;Ai Bo;Oestges Claude

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在设计高速铁路的分集和快速切换方案时,需要更好地理解阴影衰落相关特性。本文基于中国6146个小区的大量测量数据,提出了高速铁路环境下阴影衰落的自相关和互相关模型。测量进行使用实际部署和操作的全球系统移动的通信铁路(GSM-R)系统在930 MHz,以反映HSR环境中的阴影衰落的真实的条件。分析中考虑了七种典型的高速铁路环境和实际的基站参数。它被发现,去相关距离与阴影衰落的标准差(STD),一般是大于100米,在大多数高速铁路环境。相邻基站间阴影衰落的互相关依赖于基站的高度和天线的倾斜角度,提出了一种启发式的截断高斯分布互相关模型。该模型通过在另一条运营的高铁线路上进行的测量进行了验证。研究结果可用于仿真算法分析信号干扰比(SIR)特性,并开发新的更好的切换方案。
In the design of diversity and fast handover schemes for high-speed railways (HSRs), a better understanding of the shadow fading correlation properties is required. In this paper, both auto- and cross-correlation models of shadow fading in HSR environments are proposed based on a large set of measurements with 6146 cells in China. The measurements are conducted using a practically deployed and operative Global System for Mobile Communications-Railway (GSM-R) system at 930 MHz to reflect the real conditions of shadow fading in HSR environments. Seven typical HSR environments and the realistic base station (BS) parameters are considered in the analysis. It is found that the decorrelation distance is correlated with the standard deviation (STD) of shadow fading and is generally larger than 100 m in most HSR environments. The cross correlation of shadow fading between two neighboring BSs depends on the BS height and the tilt angle of the antenna, and a heuristic truncated Gaussian distribution model of cross correlation is proposed. The model is validated by the measurements conducted in another operative HSR line. The results can be used to exploit the simulation algorithms to analyze the signal-to-interference-ratio (SIR) properties and to develop new and better handover schemes for HSRs.
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