Patent ID: 6922104

Claim:
A distortion compensating method for a power amplifier, wherein a reverse coefficient table stores a plurality of reverse distortion coefficients for compensating for distortion generated by the power amplifier, a reverse distortion coefficient corresponding to envelope amplitude and a time difference of the envelope amplitude of an incoming signal is read from the reverse distortion coefficient table, a distortion compensation process is performed on the incoming signal using the read reverse distortion coefficient, the distortion compensation processed signal is amplified and transmitted by the power amplifier, and the reverse distortion coefficient table is updated based on the incoming signal before distortion compensation and the output signal of the power amplifier, comprising obtaining phase relations between the time difference value and the reverse distortion coefficient relative to the reverse distortion coefficient corresponding to a linear operation domain of the power amplifier, and adjusting frequency characteristics of a frequency characteristic compensation filter to which the distortion compensated signal is supplied such that inclination of the phase of the reverse distortion coefficient becomes small.