Patent ID: 7929639

Claim:
A radio frequency distortion compensator receiving a digital signal and a symbol synchronization signal from an external modem, performing a digital signal process, and outputting a signal to a digital/analog converter in an orthogonal frequency division multiplexing transmission system, the radio frequency distortion compensator comprising: a digital modulator for receiving the digital signal and converting the digital signal to serial in-phase and quadrature-phase signals, wherein a digital process is performed on the digital signal, the digital signal process being performed after the serial in-phase and quadrature-phase signals are converted by a serial/parallel data converter, and wherein the digital processed digital signal is input to the digital/analog converter; an inverse sync function coefficient generator configured for storing an inverse sync function, wherein the stored inverse sync function is based on distortion caused by a signal attenuation of a radio frequency signal input to the digital/analog converter, and wherein the inverse sync function coefficient generator outputs an output value of the inverse sync function corresponding to a symbol generated from the attenuated signal of the radio frequency signal when the input symbol synchronization signal from the external modem is input to the inverse function coefficient generator, the output value being a compensation signal; a sync function compensator for multiplying the compensation signal output from the inverse sync function coefficient generator by an output value of the digital modulator; and the serial/parallel data converter for converting a signal output from the sync function compensator into a frequency domain signal.