A modified Doppler frequency trajectory undergoing varying velocities in HSR communications

摘要

The varying trajectory of Doppler frequency under changing speed motion condition sare investigated in HighSpeed Railway (HSR) scenarios. Based on the geometrical physical parameters, instantaneous Doppler trajectories and expression forms of the change rate are deduced, including acceleration and deceleration cases. These modified models provide more accurate and realistic approximations in modeling rapidly fading channels.