Patent ID: 8364091

Claim:
A method of selecting an antenna by a base station in a communication system, the method comprising: receiving a result of comparison between an average signal-to-noise ratio for channels of a mobile station and signal-to-noise ratio threshold values corresponding to possible numbers of selected antennas from the mobile station; determining beamforming schemes corresponding to the respective possible numbers of selected antennas by using the result of the comparison; calculating metrics, which represent data error rates corresponding to the possible numbers of selected antennas, by considering the determined beamforming schemes; determining a number from the possible numbers of selected antennas, corresponding to a maximum metric among the calculated metrics, as the determined number of selected antennas in the mobile station; generating combinations of transmit antennas from among all transmit antennas in the base station, each combination having the determined number of selected antennas; selecting a combination of transmit antennas, which has a maximum signal-to-noise ratio from among the combinations of transmit antennas; and generating antennas selection information comprising the selected combination of transmit antennas, wherein each of the signal-to-noise ratios is calculated by using instantaneous channel information and statistical channel information, and wherein each of the signal-to-noise ratios is calculated by using a reconstructed transmission channel vector corresponding to the selected antennas, an eigen-vector of a channel correlation vector for the selected antennas and a power allocation factor that is derived in consideration of the eigen-value.