Patent ID: 8774086

Claim:
A beamforming method of a mobile station, the beamforming method comprising: receiving, by the mobile station, at least one training signal from a plurality of base station antennas by using a plurality of mobile station antennas; measuring, by the mobile station, a moving speed of the mobile station; estimating, by the mobile station, downlink channels formed by the plurality of base station antennas and the plurality of mobile station antennas by using the at least one training signal; estimating, by the mobile station, uplink channels by using the downlink channels and a predetermined constant, when the moving speed of the mobile station is lower than a reference value; generating, by the mobile station, a beam vector corresponding to a current time slot using the estimated uplink channels when the moving speed of the mobile station is lower than the reference value; generating a beam vector that has been applied to the plurality of the mobile station antennas for previous beamforming as the beam vector corresponding to the current time slot, when the moving speed of the mobile station is greater than the reference speed; and beamforming, by the mobile station, by applying the beam vector corresponding to the current time slot generated according to the moving speed of the mobile station to the plurality of mobile station antennas to transmit a signal through the uplink channels.