Patent ID: 7212784

Claim:
An adaptive array apparatus that includes a plurality of radio units each made up of a transmission unit, a reception unit, and an antenna, comprising: a selection unit operable to select a radio unit from the plurality of radio units, the selection unit, after the control unit finishes measuring transfer characteristics of a selected radio unit, sequentially selects another radio unit from the plurality of radio units; and a control unit operable to cause the selected radio unit to transmit signals respectively to unselected radio units of the plurality of radio units, and measure transfer characteristics of the selected radio unit based on the signals received at the unselected radio units, the control unit calculates correction values respectively of the plurality of radio units based on the transfer characteristics measured by the control unit, wherein the selection unit selects two radio units, causes the two radio units to perform the signal transmission by forming an array antenna pattern in which null is directed toward one of the unselected radio units, and changes at least one of a phase and an amplitude of one of the two radio units, and the control unit sets, as the transfer characteristics, the at least one of the phase and the amplitude under a condition where a signal level of the one of the unselected radio units undergoes the minimum signal level while the change is being performed.