Measurement and Analysis of Extra Propagation Loss of Tunnel Curve | IEEE Journals & Magazine | IEEE Xplore

Measurement and Analysis of Extra Propagation Loss of Tunnel Curve


Abstract:

Wave propagation experiences extra loss in curved tunnels, which is highly desired for network planning. Extensive narrow-band propagation measurements are made in two ty...Show More

Abstract:

Wave propagation experiences extra loss in curved tunnels, which is highly desired for network planning. Extensive narrow-band propagation measurements are made in two types of Madrid subway tunnels (different cross sections and curvatures) with various configurations (different frequencies and polarizations). A ray tracer validated by the straight and curved parts of the measuring tunnels is employed to simulate the reference received signal power by assuming the curved tunnel to be straight. By subtracting the measured received power in the curved tunnels from the simulated reference power, the extra loss resulting from the tunnel curve is extracted. Finally, this paper presents the figures and tables quantitatively reflecting the correlations between the extra loss and radius of curvature, frequency, polarization, and cross section, respectively. The results are valuable for statistical modeling and the involvement of the extra loss in the design and network planning of communication systems in subway tunnels.
Published in: IEEE Transactions on Vehicular Technology ( Volume: 65, Issue: 4, April 2016)
Page(s): 1847 - 1858
Date of Publication: 21 April 2015

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I. Introduction

Nowadays, a large number of public communication systems, including Global System for Mobile Communications, third-generation, Wi-Fi, World Interoperability for Microwave Access, and Long-Term Evolution (LTE), are expected to support continuous service in subway tunnels to guarantee user experience [1]. For dedicated communication systems, such as Terrestrial Trunked Radio [2], [3], Global System for Mobile Communications for Railway (GSM-R) [4], communication-based train control system [5], LTE for Railway [6], etc., high reliability, availability, maintainability, and safety [7] must to provide safety-critical data transmissions for train control in subway tunnels [8]. In the near future, various high-data-rate applications, such as real-time high-definition video surveillance, will be required to enable face recognition and emotion analysis [9]– [11] for security concerns (e.g., terrorist attacks, riots, etc). For public wireless communication systems or signaling and train control communication systems, a full understanding of the propagation is mandatory for their deployments in subway tunnels.

References

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