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1. WO2012066383 - ORTHOGONAL BASIS FUNCTION SET FOR DIGITAL PREDISTORTER

Publication Number WO/2012/066383
Publication Date 24.05.2012
International Application No. PCT/IB2010/055195
International Filing Date 16.11.2010
IPC
H03F 1/32 2006.01
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
1Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
32Modifications of amplifiers to reduce non-linear distortion
CPC
H03F 1/3247
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
1Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
32Modifications of amplifiers to reduce non-linear distortion
3241using predistortion circuits
3247using feedback acting on predistortion circuits
H03F 1/3252
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
1Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
32Modifications of amplifiers to reduce non-linear distortion
3241using predistortion circuits
3252using multiple parallel paths between input and output
H03F 1/3258
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
1Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
32Modifications of amplifiers to reduce non-linear distortion
3241using predistortion circuits
3258based on polynomial terms
H03F 2201/3209
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
2201Indexing scheme relating to details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements covered by H03F1/00
32Indexing scheme relating to modifications of amplifiers to reduce non-linear distortion
3209the amplifier comprising means for compensating memory effects
H03F 3/19
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
3Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
189High frequency amplifiers, e.g. radio frequency amplifiers
19with semiconductor devices only
H03F 3/24
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
3Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
20Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
24of transmitter output stages
Applicants
  • TELEFONAKTIEBOLAGET LM ERICSSON (publ) [SE]/[SE] (AllExceptUS)
  • BAI, Chunlong [CA]/[CA] (UsOnly)
Inventors
  • BAI, Chunlong
Agents
  • BENNETT, David E.
Priority Data
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) ORTHOGONAL BASIS FUNCTION SET FOR DIGITAL PREDISTORTER
(FR) JEU DE FONCTIONS DE BASE ORTHOGONALES POUR SYSTÈME DE PRÉDISTORSION NUMÉRIQUE
Abstract
(EN)
A predistorter applies a distortion function to an input signal to predistort the input signal. The output of the distortion function is modeled as the sum of the output signals from the orthogonal basis functions weighted by corresponding weighting coefficients. Techniques are described for orthogonalizing the basis function output signals depending on the distribution of the input signal.
(FR)
La présente invention concerne un système de prédistorsion qui applique une fonction de distorsion à un signal d'entrée, afin d'effectuer une prédistorsion sur le signal d'entrée. La sortie de la fonction de distorsion est modélisée sous forme de somme des signaux de sortie des fonctions de base orthogonales, pondérés par les coefficients de pondération correspondants. L'invention concerne également des techniques permettant d'orthogonaliser les signaux de sortie de fonctions de base en fonction de la répartition du signal d'entrée.
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