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http://dx.doi.org/10.6109/jkiice.2008.12.2.223

Fading characteristics of 2.4GHz band Wireless image signal for the Various Subway Tunnel Structures  

Song, Ki-Hong (동의과학대학 정보통신과)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.12, no.2, 2008 , pp. 223-230 More about this Journal
Abstract
This paper deals with the measurements of wireless image signal in subway tunnels at 2.45GHz. Measurements have been conducted in 3 subway stations with different types; a straight tunnel and two curved tunnels. As a analysis result for the measured data, we found that the signal level inside straight tunnel by the strong multipath waves fluctuate deeply compared to the curved tunnel. The path loss exponent for the Shin-hung station with the straight tunnel is 2.5, those for the Pan-am and Dae-dong station with curved tunnels are 1.6 and 1.9, respectively. The fade depth and width at 50% point became relatively serious at Shin-hung station, the level crossing rate inside the Pan-am station is larger than the other stations. Therefore, it can be concluded that the fading phenomena affect to the signal performance generate seriously at straight tunnel compared to the curved tunnel.
Keywords
2.4GHz 무선영상 신호;직선형 지하철 터널;곡선형 지하철 터널;페이딩 특성;
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  • Reference
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