Patent ID: 7289773

Claim:
A digital RF transmitter system, comprising: an input for receiving a digital input signal; a transmission path comprising a digital predistorter employing adjustable predistortion parameters to predistort the digital input signal, a digital-to-analog converter, an RF up converter, an RF power amplifier, and an output sampling coupler receiving the amplified RF output signal; an observation path, which measures the sampled output of the coupler, comprising an RF down converter, and an analog-to-digital converter providing the sampled RF output signal in a digital format; and an adaptive controller coupled to receive the digital input signal and the sampled digital output signal to determine the residual distortion within the output signal and coupled to receive one or more parameters characterizing the operating condition of the amplifier and wherein the adaptive controller is coupled to the digital predistorter and provides adjusted predistortion parameters to the digital predistorter to reduce the distortion further and comprises a predistortion parameter list having a plurality of unordered list elements, wherein the number of list elements changes dynamically, each element having one or more predistortion parameters and one or more parameters characterizing the operating condition of the amplifier system.