Patent ID: 8014736

Claim:
A distortion compensating apparatus comprising: an information measuring unit that measures a distortion component based on a feedback signal obtained by feeding back a portion of a radiation signal radiated from an antenna, and that also measures an electric power component based on electric power information extracted from the radiation signal radiated from the antenna; a compensation coefficient calculating unit that calculates a compensation coefficient to correct distortion of the signal radiated from the antenna, from the distortion component and the electric power component that are measured by the information measuring unit; a signal transmitting unit that outputs a signal corrected using the compensation coefficient calculated by the compensation coefficient calculating unit as a transmission signal; a signal converting unit that converts the transmission signal transmitted by the signal transmitting unit into a high frequency signal; an amplitude separating unit that amplifies the high frequency signal converted by the signal converting unit, that outputs the amplified high frequency signal, that picks up a portion from the output high frequency signal, and that separates the portion as a signal to be fed back; a feeding-back unit that outputs to the information measuring unit as the feedback signal a signal obtained by executing frequency conversion and digital conversion to the high frequency signal separated by the amplitude separating unit to be fed back; and an electric power information extracting unit that outputs the high frequency signal separated by the amplitude separating unit as the radiation signal to the antenna, that extracts the electric power information from the radiation signal, and that directly outputs the electric power information to the information measuring unit without passing the electric power information through the feeding-back unit.