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Measurement and Analysis of Propagation Characteristics in Curved Subway Tunnel Environments  

정회동 (㈜나리지온 FSB/DEG2)
박노준 (원광대학교 전자공학과 초고주파 및 광통신연구)
강영진 (원광대학교 공과대학 전기전자 및 정보공학)
송문규 (원광대학교 공과대학 전기전자 및 정보공학부)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.29, no.8A, 2004 , pp. 950-961 More about this Journal
Abstract
In this paper, we measured and analyzed propagation characteristics in a subway tunnel that is recently increasingly becoming one of the radio communication environments. The measurements are carried out in a subway tunnel with frequency bands of 2.45㎓ and 5.8㎓. The length of tunnel we used for this study is 175m of LOS (Line-of-sight) and 270m of NLOS (Non Line-of-Sight). The subway tunnel is curved and its cross section is horseshoe type. The measurement systems we employ in this study are a narrow-band system and a wide-band system. The narrow-band system is used to get path loss measurement and the wide-band system is used to figure out delay profile measurement. In particular, the wide-band system consists of 1023 length PN sequence generator using a chip rate of 80MHz based on a sliding correlation technique. The omni-directional antennas and directional antennas are used to analyze propagation characteristics for beam type of antenna. The path loss displays only pure path loss of a tunnel environment. The delay profile indicates the mean excess delay and RMS (root mean square) delay spread.
Keywords
subway tunnel; path loss; sliding correlation; mean excess delay; RMS delay spread;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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