Patent ID: 8964893
Filing Date: 2015-02-24
Classification: H03F

Abstract:
1. A predistortion apparatus for a power amplifier, comprising: a reducer to output a signal that a peak to average power ratio of an input signal is reduced by clipping; a first predistorter to generate and output a first predistortion signal from the output signal of the reducer, based on a signal obtained by subtracting a clipping noise signal, which is obtained by subtracting the output signal of the reducer from the input signal of the reducer, from the output signal of the reducer, so as to reduce energy of a residual error component obtained by removing the clipping noise signal from an error signal included in an output of the power amplifier; a second predistorter to generate and output, by using the clipping noise signal, a second predistortion signal to remove the clipping noise signal included in the first predistortion signal; and a combiner to generate an input signal of the power amplifier obtained by combining the first predistortion signal and the second predistortion signal.