Patent ID: 7139593

Claim:
For use in wireless network communications system comprising a base transceiver station having an adaptive antenna array and a mobile station having a first mobile antenna and a second mobile antenna, an apparatus for improving downlink performance of said adaptive antenna array of said base transceiver station, said apparatus comprising: a spatial signature estimator associated with said base transceiver station, said spatial signature estimator operable to obtain a spatial signature from a signal received by said base transceiver station from said first mobile antenna and further operable to obtain a spatial signature from a signal received by said base transceiver station from said second mobile antenna; and correlation circuitry coupled to said spatial signature estimator, said correlation circuitry operable to use spatial signatures obtained from said first mobile antenna and from said second mobile antenna to identify a least changing spatial signature and further operable to use said least changing spatial signature to obtain a downlink beamforming weight vector.