Patent ID: 7133698

Claim:
A radio base station apparatus comprising: a fading correlation monitor that detects a fading correlation of radio waves received through a plurality of antenna elements; a reception method selector that receives the radio waves from the antenna elements and provides the radio waves to a receiver selected in accordance with the detected fading correlation; a directional receiver that executes directional reception, on the provided radio waves, only when the reception method selector selects the directional receiver to receive the provided radio waves; a diversity receiver that executes diversity reception, on the provided radio waves, only when the reception method selector selects the diversity receiver to receive the provided radio waves; and a demodulator that demodulates a signal output by the receiver selected to receive the radio waves provided by the reception method selector, wherein: the directional receiver creates directivity for the radio waves to increase the quality of the demodulated signal, and the diversity receiver combines or selects a plurality of signal sequences within the radio waves to increase the quality of the demodulated signal.