Patent ID: 9484962
Filing Date: 2016-11-01
CPC Classification: H03F,H04B

Claim Text:
1. A system, comprising: a pre-distortion unit configured to pre-distort an input signal based on a model parameter by directly computing an inverse of a power amplifier model in an iterative fashion and configured to alternate between computing the inverse and updating the model parameter, thereby providing a pre-distorted signal, wherein the pre-distortion unit calculates the pre-distorted signal according to the following function: where h 00 , h 0k , and h mk are coefficients and x(n) represents the input signal; a power amplifier circuit configured to amplify the pre-distorted signal; wherein the power amplifier model is configured to model amplification of the pre-distorted signal by the power amplifier circuit based on the pre-distorted signal and the model parameter; and a parameter-estimation unit configured to update the model parameter provided to the pre-distortion unit and the power amplifier model based on the pre-distorted signal and an error signal, wherein the error signal represents a difference between an output signal from the power amplifier circuit and a modeled output signal from the power amplifier model, and configured to iteratively update the model parameter by alternating between updating the model parameter and computing the inverse of the power amplifier model by the pre-distortion unit.