Patent ID: 8467468
Filing Date: 2013-06-18
Classification: H04B

Abstract:
1. A radio transmitting and receiving apparatus that has a plurality of antennas used for communication in a multi-user and multi-cell environment, comprising: a channel information estimating unit that uses a signal received from a first base station of a cell to which the radio transmitting and receiving apparatus belongs to estimate desired channel information between the radio transmitting and receiving apparatus and the first base station, and uses a signal received from a second base station of a cell adjacent to the cell to which the radio transmitting and receiving apparatus belongs to estimate interference channel information, which indicates a degree of interference by which the second base station is affected due to a transmission operation of the radio transmitting and receiving apparatus; and a transmission method implementing unit that implements a transmission method of a radio signal to be transmitted, on the basis of the estimated desired channel information and interference channel information, wherein the transmission method implementing unit includes: a stream number determining unit that determines the number of streams simultaneously transmitted, on the basis of the desired channel information and the interference channel information; a stream multiplexing unit that divides a transmission information signal into a plurality of streams; and a transmission beamforming matrix calculating unit that calculates a transmission beamforming matrix on the basis of the desired channel information and the interference channel information.