Patent ID: 8570927

Claim:
A radio communication system, comprising: a reception device provided with a plurality of reception antennas and a plurality of radio reception units respectively connected to the plurality of reception antennas; and a transmission device provided with a plurality of transmission antennas and a plurality of radio transmission units respectively connected to the plurality of transmission antennas, the reception device being configured to acquire a plurality of communication signals transmitted respectively from the plurality of transmission antennas based on a propagation path characteristic exhibited in a direction from the transmission device toward the reception device, wherein: the reception device comprises reception-side calibration information notifying means for notifying the transmission device of reception-side calibration information regarding the plurality of radio reception units; and the transmission device comprises: inverse-direction propagation path characteristic calculating means for calculating, as an inverse-direction propagation path characteristic, a propagation path characteristic exhibited in a direction from the reception device toward the transmission device; forward-direction propagation path characteristic calculating means for calculating a forward-direction propagation path characteristic corresponding to the propagation path characteristic exhibited in the direction from the transmission device toward the reception device, based on the inverse-direction propagation path characteristic, the reception-side calibration information notified from the reception device, and transmission-side calibration information regarding the plurality of radio transmission units; and communication signal transmitting means for transmitting the plurality of communication signals weighted based on the forward-direction propagation path characteristic respectively from the plurality of transmission antennas, and wherein: the propagation path characteristic exhibited in the direction from the transmission device toward the reception device is calculated based on a plurality of transmission-side known signals transmitted respectively from the plurality of transmission antennas and a plurality of superposed signals that are formed of the plurality of transmission-side known signals superposed one on another and are received respectively by the plurality of reception antennas; and the propagation path characteristic exhibited in the direction from the reception device toward the transmission device is calculated based on a plurality of reception-side known signals transmitted respectively from the plurality of reception antennas and a plurality of superposed signals that are formed of the plurality of reception-side known signals superposed one on another and are received respectively by the plurality of transmission antennas.