Patent ID: 7288988

Claim:
An adaptive predistortion linearized amplifier system, comprising: an input receiving an input signal; a predistorter coupled to the input and performing a predistortion operation on the input signal using predistortion coefficients and providing a predistorted input signal; a power amplifier receiving and amplifying the predistorted input signal and providing an amplified signal; an output coupled to the power amplifier and providing the amplified signal as an output signal; and an adaptation circuit coupled to the input and output and receiving sampled input and output signals therefrom, the adaptation circuit comprising a selective sampling circuit providing a reduced number of samples derived from the sampled input and output signals using a signal characteristic related to the input signal magnitude and an estimator coupled to the selective sampling circuit and performing an adaptation operation using the reduced number samples to determine updated predistortion coefficients, wherein the adaptation circuit is coupled to the predistorter and provides said undated predistortion coefficients to the predistorter, wherein said adaptation circuit further comprises an envelope detector coupled to receive the sampled input signal, wherein said signal characteristic related to the input signal magnitude comprises the sampled input signal envelope and wherein said selective sampling circuit selects local peaks of the envelope.