Patent ID: 7583982

Claim:
A method of wireless multiple-input multiple-output (MIMO) antenna communication for a wireless transmit receive unit (WTRU): receiving with a receiver having a plurality of N antennas a first set of signals from another WTRU and processing each signal by applying a different N-size RX beamforming vector of a predefined vector set across N signal paths to each signal; measuring a preferred characteristic of each processed received signal; selecting the processed received signal with a best characteristic from among the processed received signals; identifying the RX beamforming vector that was used to produce the processed received signal with the best characteristic as a choice RX beamforming vector and implementing in the receiver the choice RX beamforming vector; and processing a second set of signals for transmission by a transmitter having a plurality of M transmit (TX) antennas including: defining a signal path for each of the M TX antennas; applying a different M-size TX beamforming vector of a predefined vector set across the M signal paths to each signal of the second set of signals; and processing each signal of the second set of signals with a unitary matrix; and transmitting each processed signal of the second set of signals by the plurality of M antennas, whereby each transmitted signal of the second set of signals is selectively adjusted in direct correlation with the corresponding TX beamforming vector; the transmitting each processed signal including transmitting an index of the TX beamforming vector that was used to produce the signal; receiving an indication of which transmitted signal of the second set of signals had a best receive characteristic whereby the TX beamforming vector that was used to produce that transmitted signal is identified as a choice TX beamforming vector: the receiving an indication including receiving the index of the TX beamforming vector that was identified as the choice TX beamforming vector to enable implementation of the choice TX beamforming vector in the transmitter; and implementing in the transmitter the choice TX beamforming vector for further signal transmissions.