  Moving relay (MR), which is a candidate solution for supporting in-vehicle
users, has been investigated in different studies. Due to the mobile nature of
the MR, acquiring channel state information at the transmitter side (CSIT) is
challenging because of the fast-changing environment around the vehicle. On top
of an MR, one can use predictor antenna (PA), i.e., an additional antenna in
front of the receive antenna (RA), to obtain CSIT, and recent works have
investigated the benefits of such a set up. PA-aided CSIT acquisition normally
works with the help of different content information such as the location and
the velocity of the MR. In this paper, we study the effect of velocity
awareness on the PA system, and develop adaptive antenna selection schemes in
PA-assisted MRs. Results show that, compared to no-CSIT schemes, a
velocity-aware antenna selection-based PA system can improve the end-to-end
throughput by an order of magnitude.
