TRANSMISSION DIRECTIVITY ANTENNA CONTROL SYSTEM, BASE STATION, AND TRANSMISSION DIRECTIVITY ANTENNA CONTROL METHOD FOR USE IN THEM

摘要

To provide a base station capable of selecting an optimum beam from among transmitted ones of multi-beams. In the arrangement, a beam power determining part (4) determines M received signal powers of multi-beams, and a beam output selecting part (5) selects, based on the information of the received powers from the beam power determining part (4), a beam of the largest power from among M outputs of beam formers (31-3M), and receives the selected beam. A transmission weight generating part (6) selects, based on the received information, a beam corresponding to the signal of a spread code selected by a mobile station and also selects another any beam to notify their respective transmission weighting coefficients. A transmitted beam forming part (7) weights transmitted data corresponding to transmission array antenna elements (91-9N) with the transmission weighting coefficients. Spreaders (81,82) use respective different spread codes to spread input signals, and the transmission array antenna elements (91-9N) send the beam-formed signals.