Patent ID: 8077792

Claim:
A method for allocating transmission power in a communication system including multiple antennas including a plurality of subcarriers grouped by a plurality of groups, each group including at least one subcarrier, the method comprising: calculating a first transmission power weight for each group by using channel information; calculating an antenna transmission vector for each group by using the channel information; calculating a transmission power for each group of each antenna by using the first transmission power weight and the antenna transmission vector for each group; determining transmission signals to be transmitted from the multiple antennas by using the transmission power; and transmitting the transmission signals through the multiple antennas; wherein, when transmittable power for each antenna is low, the calculating the transmission power comprises: calculating a first transmission vector by using the first transmission power weight and the antenna transmission vector for each group; calculating a second transmission power weight for each antenna for allocating the transmission power by using the first transmission power weight for each group and the transmittable power for each antenna; and calculating a second transmission vector used for the transmission power by using the first transmission vector and the first transmission power weight of each antenna.