Patent ID: 7145962

Claim:
A predistortion digital linearizer, comprising: a predistorter coupled to receive an input signal and a control signal to generate a predistorted signal; an up-converter coupled to receive the predistorted signal and convert the predistorted signal into a radio frequency signal; a high power amplifier (HPA) to receive and amplify the radio frequency signal outputted from the up-converter; a feedback unit coupled to receive an output of the HPA and down-convert the received output of the HPA into a baseband signal; an adaptation processing unit coupled to receive the baseband signal and a delayed digital input signal to generate the control signal, the adaptation processing unit including: a delay unit to delay the input signal for a prescribed period of time; and a digital signal processor coupled to receive the delayed input signal from the delay unit and the baseband signal from the feedback unit to generate the control signal, wherein the predistorter comprises: a power measuring unit to measure a power magnitude of the input signal; a work function generator to receive an output of the power measuring unit and the control signal and to generate a predistortion work function for determining a distortion size of the input signal according to the magnitude of the input signal; and a complex coupler to receive and complex-couple the predistortion work function and the input signal to generate the predistorted signal.