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Path Loss and Delay Characteristics According to Various Antennas at 2.45GHz in Subway Tunnel Environment  

Kong Min-Han (Dept. of Control and Instrumentation Engineering, Wonkwang University)
Park Noh-Joon (Dept. of Electrical, Electronic and Information Engineering, Wonkwang University)
Kang Young-Jin (Dept. of Electrical, Electronic and Information Engineering, Wonkwang University)
Song Moon-Kyou (Dept. of Electrical, Electronic and Information Engineering, Wonkwang University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.43, no.5, 2006 , pp. 162-168 More about this Journal
Abstract
Understanding of propagation characteristics is very important for the wireless communication system design and wireless communication service construction. In this paper, propagation characteristics is measured and analyzed at 2.45Ghz frequency band under curved subway tunnel environment. We constituted channel measurement system with sliding correlation and five different kind of antennas. The purpose of five different type of antennas is to compare propagation characteristics according to beam shape of antennas. The path loss under tunnel environment is average $4.38^{\sim}14.41dB$ lower than free space and circular polarization antenna marked smallest path loss. Also, path loss is smallest when the receiver antenna located outside of tunnel in th curved section. 90% of delay components of all antennas measured within 20ns and directional antenna has more wide coherence bandwidth than omni-directional antenna. According to measured result, when we consider path loss and delay characteristics, circular polarization antenna is most suitable under tunnel environment.
Keywords
channel measurement; path loss; delay profile; mean excess delay; rms delay spread;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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