Path Loss Characteristics in Subway Tunnel at 2.65㎓ 


Vol. 31,  No. 10, pp. 1014-1019, Oct.  2006


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  Abstract

The research deals with the measurement of electromagnetic wave propagation in subway tunnels at 2.65 ㎓. Measurements have been conducted in 4 different types of tunnel courses, a straight tunnel, two curved tunnels, with 245 m and 500 m radius of curvature, and a tunnel that has both straight and curved sections. we found that the path loss exponent for the line-of-sight(LOS) region inside all the tunnels is 1.31~2.19. The path loss exponents for LOS regions in the tunnel is lower than 3~4, which corresponds to the path loss exponent factor for outdoor cellular environments. The path loss exponents of the straight tunnel, two curved tunnels with 245 m and 500 m radius of curvature are 1.94, 2.92, and 4.34, respectively. This indicates that a smaller radius of curvature in tunnel results in a higher path loss exponent for nonline-of-sight(NLOS) region. The path loss exponents for the NLOS region in the combined and curved tunnel, which have the same radii of cuvature, are 5.88 and 4.34, respectively. Therefore, it can be concluded that the path loss characteristics in tunnel environments are infulenced by the radii of curvature as well as the LOS distance.

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  Cite this article

[IEEE Style]

H. Jo, D. Kim, J. Yook, "Path Loss Characteristics in Subway Tunnel at 2.65㎓," The Journal of Korean Institute of Communications and Information Sciences, vol. 31, no. 10, pp. 1014-1019, 2006. DOI: .

[ACM Style]

Han-shin Jo, Do-youn Kim, and Jong-gwan Yook. 2006. Path Loss Characteristics in Subway Tunnel at 2.65㎓. The Journal of Korean Institute of Communications and Information Sciences, 31, 10, (2006), 1014-1019. DOI: .

[KICS Style]

Han-shin Jo, Do-youn Kim, Jong-gwan Yook, "Path Loss Characteristics in Subway Tunnel at 2.65㎓," The Journal of Korean Institute of Communications and Information Sciences, vol. 31, no. 10, pp. 1014-1019, 10. 2006.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880