Patent ID: 7680461

Claim:
A wireless communications system for a communication between a transmitter and a receiver each having a plurality of antennas, over a communications channel by multiplexing a signal, the system comprising: a reference signal sender which feeds back reference signals for respective antennas of the receiver from the receiver to the transmitter; a first channel information acquirer which calculates, based on the reference signals received by the transmitter, a channel information matrix H whose elements represent transfer functions of respective communication sub-channels of the channel each of which links one of the antennas of the transmitter and one of the antennas of the receiver; an SVD unit which performs a singular value decomposition of the channel information matrix H to yield UDV H , so as to obtain a transmit antenna weighting coefficient matrix V whose entries represent weighting vectors for the respective antennas of the transmitter; and a signal sender which sends the components of a reference signal from the respective antennas of the transmitter to the receiver with the components weighted by the transmit antenna weighting coefficient matrix V; a second channel information acquirer which calculates, based on the weighted reference signals received by the receiver, a channel information matrix H′ corresponding to the transmit antenna weighting coefficient matrix V and respective antennas of the receiver; a receive antenna weighting coefficient matrix decision unit, in the receiver, configured to determine a receive antenna weighting coefficient matrix based on the channel information matrix H′; and a decoder, in the receiver, configured to decode a received signal, which is received after obtaining the receive antenna weighting coefficient matrix based on the received antenna weighting coefficient matrix.