Abschlussarbeiten

Investigation of Radio Channels under Trains

Autor : Farhan Azmat Ali
Betreuer : Prof. Dr.-Ing. Stefan Witte
Typ : Master
Forschungsbereich : Industrielle Kommunikation
Kurzbeschreibung :

Investigation of Radio-Channels under Trains

In this thesis work, the behavior of radio channels under the freight train is investigated. To compare the behavior measurements are performed in different environments; anechoic chamber, free field, car parking area and under the freight train to see the influence of train metal environment on the channel. The measurement setup was made with directional and omnidirectional antennas, RF generator, spectrum analyzer and “Data Acquisition & Analysis”, a software tool specially designed for these measurements. Three different frequency bands; 434 MHz, 868 MHz and 2.4 GHz are used for the measurements to see which band is appropriate for the train environment. To proceed with the measurements, transmitting and receiving antennas are separated at different distances in meters and power of the received signal is measured at the receiver side with spectrum analyzer. On the basis of these measurements, a path loss model is designed, for each frequency band measured, which provides the mathematical and graphical description of measurements. The investigation shows, that the 2.4 GHz Band gives better results than 434 MHz and 868 MHz for wireless communication system under trains.

Kontakt : Prof. Dr.-Ing. Stefan Witte