Patent ID: 7929918

Claim:
A method of training antennas for two devices equipped with phased array antennas in a wireless network, the method comprising: a) transmitting a first estimation training sequence of length N 2 via a transmit phased array antenna, wherein N 2 corresponds to a number of antenna element at a second station (STA 2 ) acting as a receiver and wherein a transmit beamforming vector (BV) of the transmit phased array antenna of a first station (STA 1 ) acting as a transmitter is fixed to a first transmit BV while a receive BV of a receive phased array antenna of STA 2 is switched between phase vectors within N 2 weight vectors; b) transmitting a second estimation training sequence of a length N 1 via the transmit phased array antenna, wherein N 1 corresponds to a number of antenna elements at STA 1 and wherein the transmit BV is switched between phase vectors within N 1 weight vectors while the receive BV of the receive phased array antenna of STA 2 is fixed to a first receive BV; c) receiving a feedback message indicative of a first transmit BV for STA 1 ; d) transmitting a next estimation training sequence of length N 2 , wherein the transmit BV is fixed to the first transmit BV while the receive BV of STA 2 is switched between phase vectors within N 2 weight vectors; e) transmitting a next estimation training sequence of length N 1 , wherein the transmit BV is switched between phase vectors within N 1 weight vectors while the receive BV is fixed to an updated receive BV vector; f) receiving a next feedback message indicative of a new transmit BV for STA 1 ; g) repeating d)-f) for a finite number of times; and h) transmitting data via the transmit phased array antenna fixed to the last transmit BV indicated by the last feedback message.