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Wireless Communications and Mobile Computing
Volume 2017 (2017), Article ID 7135896, 17 pages
Research Article

On the Feasibility of High Speed Railway mmWave Channels in Tunnel Scenario

1State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University, Beijing 100044, China
2Beijing Engineering Research Center of High Speed Railway Broadband Mobile Communications, Beijing 100044, China
3Mobile Application Research Department, Electronics and Telecommunications Research Institute (ETRI), Daejeon 34129, Republic of Korea
4School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea

Correspondence should be addressed to Bo Ai

Received 21 May 2017; Revised 22 August 2017; Accepted 24 August 2017; Published 11 October 2017

Academic Editor: Francesco Benedetto

Copyright © 2017 Guangkai Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Rail traffic is widely acknowledged as an efficient and green transportation pattern and its evolution attracts a lot of attention. However, the key point of the evolution is how to develop the railway services from traditional handling of the critical signaling applications only to high data rate applications, such as real-time videos for surveillance and entertainments. The promising method is trying to use millimeter wave which includes dozens of GHz bandwidths to bridge the high rate demand and frequency shortage. In this paper, the channel characteristics in an arched railway tunnel are investigated owing to their significance of designing reliable communication systems. Meantime, as millimeter wave suffers from higher propagation loss, directional antenna is widely accepted for designing the communication system. The specific changes that directional antenna brings to the radio channel are studied and compared to the performances of omnidirectional antenna. Note that the study is based on enhanced wide-band ray tracing tool where the electromagnetic and scattering parameters of the main materials of the tunnel are measured and fitted with predicting models.