Distortion compensation apparatus and method

A distortion compensation apparatus comprising:

• a distortion compensation signal generation unit that performs, on a transmission signal, distortion compensation processing using a series operation;
• a coefficient updating unit that updates a group of series operation coefficients used for the series operation, based on a feedback signal of a power amplification output which is output through power amplification processing of a distortion compensation signal output from the distortion compensation signal generation unit, and based on the distortion compensation signal;
• a memory that stores the distortion compensation signal corresponding to a transmission signal having a given power value and the feedback signal of the power amplification output, as restraint information;
• and
• a control unit that performs control so that, in accordance with the power value of the transmission signal, specific restraint information corresponding to a power value different from the power value of the transmission signal is read from the memory, and the specific restraint information is used for updating the group of series operation coefficients performed by the coefficient updating unit.