Abstract:

In order to better ensure the reliability of small user terminal communications in high-speed train scenarios, an anti-Doppler frequency offset receiver design scheme is proposed based on non-uniform array beamforming and no change to the existing system model. First, the channel model and signal model in the high-speed train scenario is established. According to the characteristics of the user equipment and the signal model, a non-uniform antenna array is designed to separate useful signals by beamforming, on the basis of which frequency offset processing, channel estimation and signal combination are performed. The channel estimation response which is windowed to smooth and reduce noise, and the combination method based on the array received signal power further improve the system performance. Simulation results show that the scheme is better than the traditional direct reception method in the high-speed train scenario and that it is an effective solution for the signal reception of small user equipment in high-speed train scenarios.

Key words: high speed train scenarios, non-uniform antenna array, beamforming, Doppler shift, signal combination