Abstract
To design an OFDM train communications system it is essential to characterize and consider the channel parameters. For a high train scenario the transmission channel is frequency selective as well as time variant. Thus, delay spread and Doppler spread are investigated as crucial parameters for the OFDM system performance. Using a ray-tracing tool realistic impulse responses of the transmission channels are simulated. The investigated system includes three base stations operating in common frequency mode along a railway track and one mobile station situated on a high-speed train. Mobile station antennas with different patterns are included in the simulation model. The results are compared and assessed with respect to delay spread and Doppler spread
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