Patent ID: 8855571

Claim:
A radio communication apparatus on a reception side that communicates with a radio communication apparatus on a transmission side that includes a plurality of transmitting antennas, the radio communication apparatus on the reception side comprising: a plurality of receiving antennas; an antenna selection processing unit configured to select a transmitting antenna from the plurality of transmitting antennas, generate a set that includes antenna indexes each indicating each of the plurality of transmitting antennas, rearrange the antenna indexes in the generated set in sequence starting from an antenna index indicating the selected transmitting antenna, generate a channel matrix which is composed of as many rows as the plurality of receiving antennas and as many columns as the plurality of transmitting antennas and in which a column corresponding to the selected transmitting antenna is located at a top, and generate a selected-channel matrix composed of the column corresponding to the selected transmitting antenna, multiply an inverse matrix of the generated channel matrix by the selected-channel matrix so as to generate an evaluation matrix that includes an identity matrix composed of as many rows as the plurality of receiving antennas and that includes a submatrix that does not include the identity matrix, rearrange the antenna indexes in the set in accordance with values of elements in the evaluation matrix, and select an antenna to be used in accordance with the rearranged antenna indexes of the set; and a transmitting unit configured to transmit, to the radio communication apparatus on the transmission side, an antenna index that indicates the antenna to be used selected by the antenna selection processing unit.