Distortion compensation method and wireless communication apparatus
AssigneeSony Corporation
InventorShigeo Kusunoki
Life of this patent
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Abstract
An apparatus and method for distortion compensation of a high frequency power amplification section wherein a finite difference between envelopes of input and output signals of an amplifier of an object of distortion compensation is detected, and variation of a temperature and other parameters is suppressed using a component which originates from an offset of the finite difference. Further, a component of the finite difference which originates from the distortion is added to the input signal of the amplifier to effect distortion compensation.
Claims4
A distortion compensation method for compensating for a nonlinear distortion of power amplification means, comprising:
- a detection step of detecting individual envelopes of an input signal and an output signal of said power amplification means;
- an addition step of adding a signal corresponding to a finite difference between detection signals of the envelopes obtained by the detection step to the input signal of said power amplification means;
- an extraction step of extracting a low frequency component from the signal corresponding to a finite difference;
- and
- a control step of controlling a gain of gain control means provided on an input side of said power amplification means based on the low frequency component extracted in said step of extracting.
A power amplification apparatus, comprising:
- power amplification means;
- input envelope detection means for detecting an envelope of an input signal of said power amplification means;
- output envelope detection means for detecting an envelope of an output signal of said power amplification means;
- finite difference detection means for producing a signal corresponding to a finite difference between an output signal of said input envelope detection means and an output signal of said output envelope detection means;
- addition means for adding an output signal of said finite difference detection means to the input signal of said power amplification means;
- low frequency extraction means for extracting a low frequency component from the signal outputted from said finite difference detection means;
- and
- gain control means provided on input side of said power amplification means and having a gain controlled with a low frequency component signal outputted from said low frequency extraction means.
A wireless communication apparatus, comprising:
- a power amplification apparatus operating as a high frequency power amplification section, including:
- power amplification means;
- input envelope detection means for detecting an envelope of an input signal of said power amplification means;
- output envelope detection means for detecting an envelope of an output signal of said power amplification means;
- finite difference detection means for producing an output signal corresponding to a finite difference between an output signal of said input envelope detection means and an output signal of said output envelope detection means;
- and
- addition means for adding the output signal of said finite difference detection means to the input signal of said power amplification means;
- low frequency extraction means for extracting a low frequency component from the output signal from said finite difference detection means;
- and
- gain control means provided on an input side of said power amplification means and having a gain controlled with a low frequency component signal outputted from said low frequency extraction means.
Dependencies are inferred from the claim text.