Patent attributes
The contents of a distortion compensation table for adjusting a waveform of a signal input to an amplification apparatus are more precisely adjusted to suppress distortion occurring in an output signal. A table value calculation unit exercises adaptive control over compensation data I and Q according to the perturbation method using power series to update a power series distortion compensation table when distortion of an output signal from a power amplification unit is greater than a first threshold used in the adaptive control process performed on the compensation data I and Q according to the perturbation method using power series. When the distortion of the output signal from the power amplification unit is smaller than the first threshold used in the adaptive control process performed on the compensation data I and Q according to the perturbation method using power series, the table value calculation unit performs an adaptive control process on the compensation data I and Q according to the perturbation method based on interpolation using representative points to update a representative point interpolation distortion compensation table.
