Patent ID: 8489039

Claim:
A method comprising: providing a first device comprising a plurality of first antennas and a second device comprising a plurality of second antennas; at the second device, wirelessly transmitting signals from the second antennas in a rotating sequence during a plurality of time slots such that all of the second antennas transmit the respective signals over a time interval encompassing the time slots and, during any one of the time slots, only one of the second antennas transmits a corresponding one of the signals, none of the transmitted signals carrying information identifying the respective second antennas from which the signals were transmitted; at the first device: receiving the signals from the second device over the time interval blindly as to from which of the second antennas the signals were transmitted during any one of the time slots; computing beamforming weights from the signals received over the time interval; and applying the beamforming weights to other signals to be transmitted from the first plurality of antennas of the first device to the second plurality of antennas of the second device.