A system and method is disclosed for improving downlink performance of an
adaptive antenna array in a vehicular environment. The system comprises a
mobile station that has a first mobile antenna and a second mobile
antenna. A spatial signature estimator associated with a base transceiver
station obtains spatial signatures from signals from the first mobile
antenna and from the second mobile antenna within an uplink interval.
Correlation circuitry uses the spatial signatures to identify a least
changing spatial signature to obtain an optimal downlink beamforming
weight vector to be used in the transmission of a signal to the mobile
station in the next downlink interval.