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Abstract

A circuit herein compensates an input signal for distortion introduced to that signal by a non-linear device. A predistorter predistorts the input signal based on a predistortion model to compensate for distortion introduced by the non-linear device. When this predistorted input signal is input into the non-linear device, the device produces an output signal as a function of the predistorted input signal. From this output signal, a feedback generation circuit generates a feedback signal that includes one or more input signal components and one or more distortion components. A selective attenuation circuit selectively attenuates the input signal components in this feedback signal to generate a modified version of the feedback signal with a reduced magnitude difference between the input signal components and the distortion components. Finally, a model adaptation circuit dynamically adapts model parameters of the predistortion model based on the modified version of the feedback signal.

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First Claim