Patent ID: 8160125

Claim:
A mobile station comprising: a channel matrix generation unit configured to generate a channel matrix with respect to channels ranging from a base station to a mobile station, the base station including multiple transmission antennas; a codebook updating unit configured to generate a second codebook including a plurality of second codeword matrixes based on 1) the generated channel matrix and 2) a first codebook including a plurality of first codeword matrixes; a codeword selection unit configured to select at least one transmission codeword matrix from among the plurality of second codeword matrixes; a transmission unit configured to transmit an index of the selected transmission codeword matrix to the base station; and a receiving unit configured to receive data transmitted from the base station via the multiple transmission antennas based on the transmitted index, wherein the channel matrix generation unit, the codebook updating unit, the codeword selection unit, the transmission unit, the receiving unit or any combination thereof is implemented by hardware.