ORTHOGONAL CROSS POLARIZATION INTERFERENCE COMPENSATING DEVICE, DEMODULATOR, RECEIVING STATION, AND METHOD OF COMPENSATING CROSS POLARIZATION INTERFERENCE

摘要

An orthogonal cross polarization interference compensating device for solving the problem that integration contents of an integration circuit are indefinite when a control loop is cut. An orthogonal cross polarization interference compensator generates a compensation signal for compensating phase noise included in an own polarization signal. A demodulator compensates orthogonal cross polarization interference based on the compensation signal for the phase noise included in the own polarization signal. An error detector generates an error signal indicating phase difference between the own polarization signal compensated by the demodulator and a proper own polarization signal. A phase noise phase detector generates a differential signal indicating phase difference between the own polarization signal and other polarization signals based on the compensation signal and the error signal. An integration circuit integrates the differential signal and generates an integration signal. An infinite phase-shifter adjusts the compensation signal based on the integration signal. A control circuit determines whether or not orthogonal cross polarization interference is present based on the compensation signal adjusted by the infinite phase-shifter, and adjusts the integration value indicated by the integration signal to be a predetermined value when there is no orthogonal cross polarization interference.