Experimental Study of Propagation Characteristics for Wireless Communications in High-Speed Train Cars

Conference: EuCAP 2009 - 3rd European Conference on Antennas and Propagation
03/23/2009 - 03/27/2009 at Berlin, Germany

Proceedings: EuCAP 2009

Pages: 5Language: englishTyp: PDF

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Kita, Naoki; Ito, Toshio; Sagawa, Yuichi; Ogasawara, Mamoru; Nakatsugawa, Masashi (NTT Access Network Service Systems Laboratories, Nippon Telegraph and Telephone Corporation, 1-1 Hikari-no-oka, Yokosuka-Shi, Kanagawa 239-0847 Japan)
Yokoyama, Shinji (NTT Advanced Technology Corporation, 1-1 Hikari-no-oka, Yokosuka-Shi, Kanagawa 239-0847 Japan)
Tseng, Ming-Chien (Information & Communications Research Laboratories, Industrial Technology Research Institute, 195, Sec.4, Chung Hsing Rd. Chutung, Hsinchu, Taiwan 310, ROC)

This paper describes the measurement results of propagation loss characteristics in high-speed train cars. We focus on the propagation loss in intra-car communications using a 2-GHz band and inter-car communications using a 5-GHz band. The measurement campaign is carried out using real train cars under both running and non-running conditions. The measurement results for intra-car communications indicate a waveguide effect in a closed space environment, and based on the results, we clarify the maximum propagation loss expected in intra-car communications. The measurement results for inter-car communications indicate that the propagation loss is greatly affected by waves re-entering the car through train windows, and we evaluate the influence of the re-entering waves on the variance in the propagation loss between the train cars.