| Guan Ke (官科),Zhong Zhangdui,Ai Bo,Cesar Briso-Rodriguez.[J].高技术通讯(英文),2013,19(2):182~189 |
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| Train crossing modeling based on measurements and best numerical approximation in subway tunnels |
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| DOI： |
| 中文关键词: |
| 英文关键词: communication based train control systems (CBTC), measurement, train crossing, tunnel, propagation modeling |
| 基金项目: |
| Author Name | Affiliation | | Guan Ke (官科) | | | Zhong Zhangdui | | | Ai Bo | | | Cesar Briso-Rodriguez | |
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| 英文摘要: |
| Communication based train control systems (CBTC) must work even in the worst situation—train crossing. This paper models the propagation characteristics in one of the most common and pivotal scenarios—train crossing in subway tunnels which is rarely mentioned in previous publications. Firstly, measurements for train crossing scenario at 2.4 GHz in a real subway line in Madrid have been made. The field measurement is the most reliable way to reveal the propagation characteristics involving shadowing effect and fast fading. Moreover, to precisely describe the fast fading distribution and eliminate the inevitable weak points of traditional fitting way, a best numerical approximation method using Legendre orthogonal polynomials has been proposed. Comparisons show that this method works better and is of greater physical significance. Finally, a complete statistical model is given and all the coefficients can be applied by system designers for the link and system level simulations. |
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