Patent ID: 8358720

Claim:
A communication device having an adaptive array antenna, comprising: a transmission system sender configured to send a first calibration signal to a reference transmission system which is one of transmission systems respectively corresponding to a plurality of antennas constituting the adaptive array antenna, while sending a second calibration signal having a signal content different from a signal content of the first calibration signal to other transmission systems; a reference transmission system characteristic data acquiring unit configured to acquire reference transmission system characteristic data indicating a characteristic of the reference transmission system, in relation to the first calibration signal sent by the transmission system sender to the reference transmission system; a transmission system characteristic data acquiring unit configured to acquire transmission system characteristic data indicating characteristics of the other transmission systems, in relation to the second calibration signal sent by the transmission system sender to the other transmission systems; a transmission characteristic difference data acquiring unit configured to acquire transmission characteristic difference data indicating a difference in transmission characteristic between the reference transmission system and the other transmission systems, on the basis of the reference transmission system characteristic data acquired by the reference transmission system characteristic data acquiring unit and the transmission system characteristic data acquired by the transmission system characteristic data acquiring unit; a transmission calibration weight calculator configured to calculate transmission calibration weight on the basis of the transmission characteristic difference data acquired by the transmission characteristic difference data acquiring unit in relation to each of the transmission systems other than the reference transmission system among the transmission systems; a superimposing transmission system sender configured to superimpose the first calibration signal and the second calibration signal, and to send a signal resulting from the superimposition to the reference transmission system; a reference characteristic difference data acquiring unit configured to acquire reference characteristic difference data indicating the characteristic difference between the first calibration signal and the second calibration signal, which are sent by the superimposing transmission system sender to the reference transmission system; and a corrector configured to correct the transmission characteristic difference data acquired by the transmission characteristic difference data acquiring unit, on the basis of the reference characteristic difference data acquired by the reference characteristic difference data acquiring unit, wherein the transmission calibration weight calculator calculates transmission calibration weight, on the basis of the transmission characteristic difference data after correction by the corrector.