Patent ID: 8848631

Claim:
A wireless communication apparatus of a base station used in a wireless communication system that can perform multiplex communication between a plurality of user equipments and the base station, the wireless communication apparatus comprising: a channel estimation unit performs channel estimation of a propagation path from the user equipment to the wireless communication apparatus; a scheduling unit selects a pair of user equipments that perform the multiplex communication based on a result of the channel estimation; a precoding selection unit determines a precoding matrix of a projection matrix to make channel response matrices of respective user equipments orthogonal or almost orthogonal to each other in the selected pair of user equipments, wherein the precoding matrix applied to the channel response matrix of a one user equipment of the selected pair of user equipments in order to maintain the orthogonality of the channel response matrices of the selected pair of user equipments; a control information notification unit feeds back control information that includes precoding information that indicates the determined precoding matrix to the corresponding user equipments; a reception unit receives data transmitted from the respective user equipments of the selected pair of user equipments through a plurality of reception antennas; a signal separation unit separates the received data to detect a plurality of streams; and a decoding unit decodes reception data from the plurality of detected streams.