Patent ID: 8315223

Claim:
A system comprising: a mobile station that receives multibeam data in precoding Multiple Input Multiple Output from a base station, using a plurality of antennas, including: a first code book that includes contents identical to contents of a second code book installed in the base station and that includes information of beam selection for precoding; and a first control unit that determines a weight for carrying out optimum beam selection for precoding at time of searching information in the first code book, based on a state of a beam in each resource block of received data that is divided into a plurality of resource blocks in a radio communication band, to transmit the weight as feedback information to the base station, and yields one weight from a plurality of resource blocks; and a base station that transmits the multibeam data selected by beam selection in precoding Multiple Input Multiple Output to the mobile station including: the second code book that includes information of beam selection for precoding set in the second code book; a precoder that reads the second code book to carry out a process of beam forming for selecting a given beam; a second control unit that controls reading of the information of beam selection from the second code book, based on the feedback information from the mobile station; and a transmitting unit that transmits the data using the radio communication band divided into a plurality of resource blocks, wherein the second control unit has a feedback information processing unit that receives the feedback information from the mobile station, the feedback information processing unit extracting the weight for carrying out optimum beam selection for precoding at time of searching information in the second code book from the feedback information for each resource block to synthesize the extracted weights for a plurality of resource blocks.