Briso Rodriguez, Cesar and Guan, Ke and Zhong, Zhangdui and Alonso, José I.
Measurement of Distributed Antenna Systems at 2.4 GHz in a Realistic Subway Tunnel Environment..
"Ieee Transactions on Vehicular Technology", v. 61
Accurate characterization of the radio channel in tunnels is
of great importance for new signaling and train control communications systems. To model this environment, measurements have been taken at 2.4 GHz in a real environment in Madrid subway. The measurements
were carried out with four base station transmitters installed in a 2-km tunnel and using a mobile receiver installed on a standard train. First, with
an optimum antenna configuration, all the propagation characteristics of a complex subway environment, including near shadowing, path loss,shadow fading, fast fading, level crossing rate (LCR), and average fade duration (AFD), have been measured and computed. Thereafter, comparisons
of propagation characteristics in a double-track tunnel (9.8-m width) and a single-track tunnel (4.8-m width) have been made. Finally, all the measurement results have been shown in a complete table for accurate