PROJECT TITLE :

Measurements and Analysis of Large-Scale Fading Characteristics in Curved Subway Tunnels at 920 MHz, 2400 MHz, and 5705 MHz

ABSTRACT:

Wave propagation characteristics in curved tunnels are of importance for planning reliable communications in subway systems. This paper presents the in depth propagation measurements conducted in two typical types of subway tunnels - ancient arched “Kind I” tunnel and trendy arched “Kind II” tunnel - with 300- and 500-m radii of curvature with different configurations - horizontal and vertical polarizations at 920, 240zero, and 5705 MHz, respectively. Based mostly on the measurements, statistical metrics of propagation loss and shadow fading (path-loss exponent, shadow fading distribution, autocorrelation, and crosscorrelation) in all the measurement cases are extracted. Then, the massive-scale fading characteristics within the curved subway tunnels are compared with the cases of road and railway tunnels, the opposite main rail traffic scenarios, and a few “typical” scenarios to give a comprehensive insight into the propagation in various scenarios where the intelligent transportation systems are deployed. Moreover, for each of the large-scale fading parameters, extensive analysis and discussions are made to mirror the physical laws behind the observations. The quantitative results and findings are useful to understand intelligent transportation systems within the subway system.