Patent ID: 6987989

Claim:
An array antenna base station apparatus comprising: a plurality of antenna elements; a relay station receiving apparatus comprising a converter that converts: (a) individual received signals that are transmitted from a communicating party and respectively received by the plurality of antenna elements and (b) known calibration signals for use for calibration that are respectively multiplexed with the received signals into optical signals; an optical fiber transmission channel that transmits the optical signals; and a control station receiving apparatus comprising: a separator that converts the optical signals transmitted through the optical fiber transmission channel into electrical signals and separates said electrical signals back to the received signals and calibration signals corresponding respectively to the plurality of antenna elements; a measurer that measures characteristic errors superimposed upon the calibration signals separated in the separator corresponding respectively to the plurality of antenna elements; an error canceller that cancels the characteristic errors measured in the measurer on a per calibration signal basis from the received signals corresponding respectively to the plurality of antenna elements; and a directivity former that forms directivity of the received signals corresponding respectively to the plurality of antenna elements having the characteristic errors cancelled using a weight calculated based on the received signals.