  Predictor antenna (PA) system is referred to as a system with two sets of
antennas on the roof of a vehicle, where the PAs positioned in the front of the
vehicle are used to predict the channel state observed by the receive antennas
(RAs) that are aligned behind the PAs. This letter studies the performance of
PA systems in the presence of the mismatching problem, i.e., when the channel
observed by the PA is not exactly the same as the channel experienced by the
RA. Particularly, we study the effect of spatial mismatching on the accuracy of
channel state information estimation and rate adaption. We derive closed-form
expressions for instantaneous throughput, outage probability, and the
throughput-optimized rate adaptation. Also, we take the temporal evolution of
the channel into account and evaluate the system performance in
temporally-correlated conditions. The simulation and analytical results show
that, while PA-assisted adaptive rate adaptation leads to considerable
performance improvement, the throughput and the outage probability are
remarkably affected by the spatial mismatch and temporal correlations.
