Patent ID: 9054940
Filing Date: 2015-06-09
Classification: H03F,H04B,H04L

Abstract:
1. A power encoder, comprising: an amplitude-phase splitter for splitting an input signal into an envelope signal and a phase modulated signal; a pre-distortion unit for distorting the envelope signal using a look-up table (LUT) to produce a distorted envelope signal, wherein the look-up table stores a non-linear mapping of a transformation function, wherein the pre-distortion unit selects a distorted data point of the distorted envelope signal using the LUT, such that a value of the distorted data point transformed with the transformation function is linear to a corresponding data point of the envelope signal, and wherein the LUT is determined using a forward mapping by applying the transformation function to a set of input data points, and wherein the distorted data point is determined by a backward mapping of the data point of the envelope signal by selecting an input to the transformation function corresponding to an output of the transformation function that is equal to the data point of the envelope signal; a digital converter for combining the distorted envelope signal with the phase modulated signal to produce a distorted input signal; a pulse width modulator (PWM) for modulating the distorted input signal according to the transformation function to produce a modulated signal, wherein a relationship between the distorted input signal and the modulated signal is non-linear; and a switch mode power amplifier for amplifying the modulated signal.