Patent ID: 6308085
Filing Date: 2001-10-23
Classification: H04B,H04W

Abstract:
A distributed antenna system comprising:a plurality of antennas arranged in a distributed manner such that individual service areas partly overlap one another; anda centralized controller configured to control said plurality of antennas,wherein said centralized controller comprises:a first selection circuit configured to select at least one of the plurality of antennas;a transmission beam forming circuit configured to form transmission beams by adaptively setting desired excitation conditions for the at least one of the plurality of antennas selected by the first selection circuit;a second selection circuit configured to select at least one of the plurality of antennas;a reception beam forming circuit configured to form reception beams by adaptively setting desired excitation conditions for the at least one of the plurality of antennas selected by the second selection circuit; anda monitor section configured to activate the transmission beam forming circuit and the reception beam forming circuit at same frequency, and to monitor a reception level of a signal transmitted from the at least one of the plurality of antennas selected by the first selection circuit, the signal being received by the at least one of the plurality of antennas selected by the second selection circuit.