US 2019/0097589 A1Published application

Circuit and method for predistortion

AssigneeMontage Technology (Shanghai) Co., Ltd.

InventorsGang Hu, Xuepeng Wang, Yuanfei Nie

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Abstract

A circuit for predistortion, comprising a digital predistorter configured to generate a modified digital signal by modifying an input baseband signal with a predistortion coefficient; a DAC configured to generate an analog signal by converting the modified digital signal; a PA configured to generate an amplified signal by amplifying the analog signal; an attenuator configured to generate an attenuated signal by attenuating the amplified signal; an ADC configured to generate a attenuated digital signal; a timing synchronizer configured to generate a synchronized amplified signal by synchronizing the attenuated digital signal with the modified digital signal; a statistics generator configured to generate a probability density function of a plurality of samples of the input baseband signal; an orthogonal basis function generator configured to generate a set of normalized orthogonal basis functions; a predistortion coefficient training circuit configured to generate an updated predistortion coefficient.

Claims10

Dependent claims

A circuit for predistortion, comprising

a digital predistorter, configured to generate a modified digital signal by modifying an input baseband signal with a predistortion coefficient;
a digital to analog converter (DAC) connected to the digital predistorter and configured to generate an analog signal by converting the modified digital signal;
a power amplifier (PA) connected to the digital to analog converter and configured to generate an amplified signal by amplifying the analog signal;
an attenuator connected to the power amplifier and configured to generate an attenuated signal by attenuating the amplified signal;
an analog to digital converter (ADC) connected to the attenuator, configured to generate an attenuated digital signal;
a timing synchronizer connected to both the digital predistorter and the analog to digital converter and configured to generate a synchronized signal by synchronizing the attenuated digital signal with the modified digital signal;
a statistics generator connected to the analog to digital converter and configured to generate a probability density function of a plurality of samples of the input baseband signal;
an orthogonal basis function generator connected to the statistics generator and configured to generate a set of normalized orthogonal basis functions;
a predistortion coefficient training circuit connected to the orthogonal basis function generator and the timing synchronizer and configured to generate an updated predistortion coefficient;
wherein the predistortion coefficient training circuit is further connected to the digital predistorter, and the digital predistorter is configured to generate a modified digital signal by modifying an input baseband signal with the updated predistortion coefficient.

7 more elements

A method for predistortion, comprising

generating, by a digital predistorter, a modified digital signal by modifying an input baseband signal with a predistortion coefficient;
generating, by a digital to analog converter connected to the digital predistorter, an analog signal by converting the modified digital signal;
generating, by a power amplifier connected to the digital to analog converter, an amplified signal by amplifying the analog signal;
generating, by an attenuator connected to the power amplifier, an attenuated signal by attenuating the amplified signal;
generating, by an analog to digital converter connected to the attenuator, an attenuated digital signal;
generating, by a timing synchronizer connected to both the digital predistorter and the analog to digital converter, a synchronized signal by synchronizing the attenuated digital signal with the modified digital signal;
generating, by a statistics generator connected to the analog to digital converter, a probability density function of a plurality of samples of the input baseband signal;
generating, by an orthogonal basis function generator connected to the statistics generator, a set of normalized orthogonal basis functions;
generating, by a predistortion coefficient training circuit connected to the orthogonal basis function generator and the timing synchronizer, an updated predistortion coefficient;
generating, by the digital predistorter further connected to the predistortion coefficient training circuit, a modified digital signal by modifying an input baseband signal with the updated predistortion coefficient.

7 more elements

Dependencies are inferred from the claim text.