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In this paper, we propose a Doppler pre-compensation scheme for high-mobilityorthogonal frequency division multiplexing (OFDM) uplink, where a high-speedterminal transmits signals to the base station (BS). Considering that thetime-varying multipath channel consists of multiple Doppler frequency offsets(DFOs) with different angle of departures (AoDs), we propose to perform DFOpre-compensation at the transmitter with a large-scale uniform linear array(ULA). The transmitted signal passes through a beamforming network withhigh-spatial resolution to produce multiple parallel branches. Each branchtransmits signal towards one direction thus it is affected by one dominant DFOwhen passing over the time-varying channel. Therefore, we can compensate theDFO for each branch at the transmitter previously. Theoretical analysis for theDoppler spread of the equivalent uplink channel is also conducted. It is foundthat when the number of transmit antennas is sufficiently large, thetime-variation of channel can be efficiently suppressed. Therefore, theperformance will not degrade significantly if applying the conventionaltime-invariant channel estimation and equalization methods at the receiver.Simulation results are provided to verify the proposed scheme.

Angle-Domain Doppler Pre-Compensation for High-Mobility OFDM Uplink with a Massive ULA