Signal processing device, signal processing method, and non-transitory computer readable medium for a distortion compensation circuit

A signal processing method performed by a signal processing device comprising:

• executing distortion compensation processing of compensating for nonlinear distortion on one or more input signals among a plurality of input signals, and outputting a signal subjected to the distortion compensation processing;
• amplifying, by a plurality of amplifiers, the plurality of input signals including the signal subjected to the distortion compensation processing and outputting the amplified signals as output signals;
• calculating, for each input signal of the plurality of input signals, at least one of a phase difference, an amplitude ratio, or an intensity ratio between the input signal and the output signal corresponding to the input signal during a calibration operation of the signal processing device in which calibration signals are used as the plurality of input signals and are input to the plurality of amplifiers;
• and
• specifying a maximum value and a minimum value for numerical values of any of the phase difference, the amplitude ratio, or the intensity ratio, determine whether or not a first difference is equal to or greater than a first threshold, and controlling whether or not to execute the distortion compensation processing on the calibration signals based on the determination result, wherein the first difference is a difference between the maximum value and the minimum value.

A non-transitory computer readable medium storing a program for causing a-signal processing device to perform:

• executing distortion compensation processing of compensating for nonlinear distortion on one or more input signals among a plurality of input signals, and outputting a signal subjected to the distortion compensation processing;
• amplifying, by a plurality of amplifiers, the plurality of input signals including the signal subjected to the distortion compensation processing and outputting the amplified signals as output signals;
• calculating, for each input signal of the plurality of input signals, at least one of a phase difference, an amplitude ratio, or an intensity ratio between the input signal and the output signal corresponding to the input signal during a calibration operation of the signal processing device in which calibration signals are used as the plurality of input signals and are input to the plurality of amplifiers;
• and
• specifying a maximum value and a minimum value for numerical values of any of the phase difference, the amplitude ratio, or the intensity ratio, determine whether or not a first difference is equal to or greater than a first threshold, and controlling whether or not to execute the distortion compensation processing on the calibration signals based on the determination result, wherein the first difference is a difference between the maximum value and the minimum value.