Patent ID: 7565171

Claim:
A radio base station system comprising: an adaptive antenna array including a plurality of antennas arranged in a discrete manner for transmitting and receiving signals to/from a plurality of terminals; a reception weight vector calculator which develops a weight vector for separating a signal from a specific terminal among said plurality of terminals, based on signals received with said plurality of antennas; a reception response vector predictor which develops a reception response vector of a propagation path from said specific terminal, based on signals received with said plurality of antennas; a transmission response vector calculator which develops a transmission response vector of said propagation path for transmission, based on said reception response vector; and a transmission directivity controller which controls transmission directivity of said antennas, based on said transmission response vector; wherein said transmission response vector predictor includes a vector predictor regarding a function of temporal change for each element of the reception response vector as a composite waveform of a plurality of periodic waveforms with frequency components which are different from each other, used to develop said transmission response vector at arbitrary timing positions in transmission.