Patent ID: 8577303

Claim:
A method for transmitting a channel sounding signal from a user terminal in a multiple antenna system, the method comprising: estimating a channel for each of a plurality of antennas in the user terminal; calculating a receiving (RX) signal power of each of the antennas by using a channel matrix of a downlink and a beamforming weight based on channel information obtained through the channel estimation; selecting an antenna to transmit the channel sounding signal to a base station based on the calculated RX signal power of each of the antennas, the selected antenna having a highest RX signal power among the antennas; and transmitting the channel sounding signal to the base station through the selected antenna, wherein the antenna with the highest RX signal power is selected using the following equation: k = arg max i = 1 , … ⁢ , M r ⁢  Hw i  2 where M r denotes a total number of antennas of the user terminal, w i denotes the beamforming weight of an i th antenna, H denotes the channel matrix, and ∥Hw i ∥ 2 denotes the RX signal power of the i th antenna which is calculated using the channel matrix H and the beamforming weight w i of the i th antenna.