Patent ID: 8019013

Claim:
A receiver that receives a signal from a transmitter, comprising: a plurality of antennas used for multiple-input multiple-output (MIMO) communications; a channel estimation unit configured to estimate communication channel state on the basis of a first signal received by the plurality of antennas from the transmitter, and then to output first channel estimation information; a channel accumulation unit configured to accumulate the first channel estimation information for a predetermined interval; a transmission weight generator configured to generate first transmission weight on the basis of the first channel estimation information; a feedback information transmission unit configured to transmit, to the transmitter through a feedback path, first feedback information corresponding to the first channel estimation information; a reception weight generator; a channel information storage unit configured to store channel estimation information outputted by the channel estimation unit; a channel information compensating unit configured to compensate the first channel estimation information outputted by the channel estimation unit, on the basis of predetermined delay time information and channel state information stored in the channel information storage unit; and a transmission weight accumulation unit, wherein the plurality of antennas receive a second signal transmitted from the transmitter, the second signal being transmitted by using the first feedback information, the channel estimation unit estimates communication channel state on the basis of the second signal received by the plurality of antennas, and then outputs second channel estimation information, the transmission weight generator generates the first transmission weight on the basis of the first channel estimation information compensated by the channel information compensating unit, the feedback information transmitting unit transmits, to the transmitter, the first transmission weight generated by the transmission weight generator as the first feedback information, the channel accumulation unit accumulates the first channel estimation information compensated by the channel information compensating unit for a predetermined interval, the transmission weight accumulation unit accumulates the first transmission weight generated by the transmission weight generator for a predetermined interval, and the reception weight generator generates the reception weight information to be multiplied by the second signal received by the plurality of antennas, on the basis of compensated first channel estimation information accumulated in the channel accumulation unit and the first transmission weight accumulated in the transmission weight accumulation unit.