Doppler Spectrum of High Speed Train Channel Model for DVB-T2 Application

The need for communication with high speed and low latency is not only needed in cellular communication, but also in railway communication. The influence of vehicle speed, such as high-speed train (HST) causes the Doppler effect which can reduce the quality of communication. Selection of the right channel model in the railway communication system, especially for communication on HST is very necessary. This study proposes a Doppler spectrum channel model on HST for DVBT2 (Digital Video Broadcasting-Second Generation Terrestrial) applications using auto correlation validation. The research results show that the line of sight (LOS) condition has a higher channel gain analysis than the Non-LOS (NLOS) condition for the two speed scenarios, and both speeds have a Normal Gaussian pattern based on the PDF analysis. According to the autocorrelation-based channel validation results, both scenarios with speeds of 50 m/s and 100 m/s exhibit a steady slope and no oscillation under LOS conditions. This study also demonstrates that the Doppler shift in the HST channel varies based on the speed scenario and the number of scatterers present, with the higher the frequency and speed resulting in a greater Doppler shift. According to Complementary Cumulative Distribution Function (CCDF) analysis, increasing the HST speed results in a fall in the CCDF value, which also means that the signal power or signal-to-noise ratio (SNR) decreases.