Measurement-based auto-correlation model of shadow fading for the high-speed railways in urban, suburban, and rural environments
Measurement-based auto-correlation model of shadow fading for the high-speed railways in urban, suburban, and rural environments
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DOI：
10.1109/aps.2014.6904803
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发表时间：
2014-07
期刊：
影响因子：
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通讯作者：
R. He;Z. Zhong;B. Ai;Bei Zhang
中科院分区：
文献类型：
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作者：
R. He;Z. Zhong;B. Ai;Bei Zhang
为了保证高速铁路的可靠通信，必须开发新的、更好的切换算法。因此，深入了解阴影衰落的相关特性是设计切换方案的基础。本文基于国内大量实测数据，提出了高铁环境下阴影衰落的自相关模型。测量分别在城市，郊区和农村环境中沿着高铁线路进行，使用实际部署和运行的gsm -铁路系统，频率为930 MHz。发现自相关系数服从指数衰减函数。城市环境的去相关距离约为57 m，城郊和农村环境的去相关距离大于110 m。研究结果可用于分集和快速切换方案的设计。
In order to maintain reliable communications in high-speed railways (HSR), new and better handover algorithms must be developed. A deep understanding of the correlation properties of shadow fading, which is the basic of designing a handover scheme, is thus required. In this paper, an auto-correlation model of shadow fading in HSR environments is proposed based on a large body of measurements in China. The measurements are conducted along the HSR lines in urban, suburban, and rural environments, respectively, using a practically deployed and operative GSM-Railway system at 930 MHz. It is found that the auto-correlation coefficient follows an exponential decay function. The decorrelation distance is around 57 m in urban, and is larger than 110 m in suburban and rural environments. The results can be used for the design of diversity and fast handover schemes.