  High-mobility wireless communications have received a lot of attentions in
the past few years. In this paper, we consider angle-domain Doppler shifts
compensation scheme to reduce the channel time variation for the high-mobility
uplink from a high-speed terminal (HST) to a base station (BS). We propose to
minimize Doppler spread by antenna weighting under the constraint of
maintaining radiation efficiency. The sequential parametric convex
approximation (SPCA) algorithm is exploited to solve the above non-convex
problem. Moreover, in order to save the RF chains, we further exploit the idea
of antenna selection for high-mobility wireless communications. Simulations
verify the effectiveness of the proposed studies.

Signal Processing