Patent ID: 7161976

Claim:
An interference canceller comprising: a multi-beam forming unit that forms B beams using signals received from N antenna elements wherein directivity of each beam is fixed, and outputs beam signals corresponding to the respective B beams; a multi-beam demodulation unit that detects P paths using the beam signals, generates path position information corresponding to the paths, removes interference from each of the beam signals by calculating a channel estimate for each of the paths using the path position information, and synthesizes the beam signals from which the interference has been removed to generate a first beam-synthesized signal; a high-rate replica generation unit that generates a replica signal and a symbol replica for each of the beam signals using the path position information, the first beam-synthesized signal, and the channel estimate; a delay unit that delays each of the beam signals for a processing time to generate the replica signal in the high-rate user replica generation unit; an interference component removal unit that subtracts the replica signal from the corresponding beam signal delayed to remove interference components caused by a high-rate user signal from the beam signal; and a low-rate adaptive beam demodulation unit that generates adaptive beams by performing a weight control to the beam signals from which the interference components have been removed for each of the paths, and synthesizes adaptive beam signals corresponding to the respective adaptive beams to generate a first adaptive-beam-synthesized signal.