Patent ID: 8111679

Claim:
A wireless communication system comprising: a code book that stores beamforming information identical to that stored in a code book of a base station from which a plurality of beams of data using a plurality of antennas are received from on a mobile station side; a precoder that reads the code book and performs processing to form a multi-beam pattern for data being beamformed and transmitted to the mobile station using the plurality of antennas on the base station side; and a control unit that, based on feedback information for a compensation of a phase variation in each transmission circuit of a plurality of transmission circuits that each respectively corresponds to a channel, controls a retrieval of the beamforming information that compensates the phase variation and, when notified that a phase variation compensation is required by the base station, searches the beamforming information, based on a signal condition of each of the beams, for the beamforming information that enables optimal beamforming, and transmits the selected beamforming information to the base station as the feedback information, wherein the control unit performs a complete search of the code book, entirely, for a beam number and a matrix number, and transmits the beam number and the matrix number to the base station as the feedback information, and after the complete search is performed, the control unit performs a partial search of a portion of the code book and transmits, as the feedback information, an optimal beam number in a matrix indicated by the matrix number.