Patent ID: 8755755

Claim:
A radio communication system for conducting communications using a plurality of antennas, the radio communication system comprising: a first radio communication apparatus used as a radio reception station including: a beam selector for receiving a signal from a radio transmission station and selecting a beam to be utilized, via pre-coding, in a future transmission in response to a state of a propagation path of the reception signal; a beam information generator for generating beam information to indicate the selected beam based on a relative value between a beam number of a beam utilized, by the radio transmission station, for the reception signal, as indicated by the radio transmission station, and a beam number of the beam selected for the future transmission, wherein the beam information corresponds to an index of a codebook storing relative beam number values; and a feedback information transmitter for transmitting feedback information containing the beam information generated to indicate the selected beam to the radio transmission station, and a second radio communication apparatus used as the radio transmission station including: a beam information acquirer for receiving the feedback information from the radio reception station and determining the beam selected by the radio reception station from the beam information generated from the relative value; a pre-coding processor for performing pre-coding to form a predetermined beam by weighting the signal to be output to a plurality of antennas based on the determined beam selected by the radio reception station; a control information generator for generating control information containing beam information specifying the predetermined beam formed by the pre-coding; and a transmitter for transmitting the control information and the signal subjected to the pre-coding processing to the radio reception station.