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We investigate the performance of a switched diversity scheme, where the transmitter selects one of the nt available transmit antennas. The selected antenna is chosen in the basis of information feedback from the receiver. In the proposed scheme, vehicle movements cause a mismatch between the state of the channel perceived by the receiver and the actual propagation conditions. Hence, an analytical approach for the evaluation of the impact of mobile speed on the system performance is derived. Then, comparisons between switched diversity and space-time coding performance are given. Such results assess the validity of the considered switched diversity approach for low mobility-low complexity wireless systems.