Patent ID: 7327191

Claim:
A distortion compensating apparatus which compensates for nonlinearity of an amplifier by adaptively updating a distortion compensation coefficient for an input signal input to the amplifier based on a difference between an input signal and an output signal of the amplifier, said apparatus comprising: distortion amount detecting means which detects the amount of distortion of an output signal of the amplifier; parameter holding means which holds a parameter having been set therein, said parameter holding means being capable of varying the difference according to the parameter set therein; parameter correcting means which corrects the parameter held in said parameter holding means in such a manner that the distortion amount detected by said distortion amount detecting means is improved; power monitoring means which monitors the power value of the output signal of the amplifier or a factor of variation in the power value; and parameter correction controlling means which halts, if a monitoring result by said power monitoring means is smaller than a specified threshold value, the correction of the parameter performed by said parameter correcting means.