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1. US20120286985 - Interpolation-based digital pre-distortion architecture

Office États-Unis d'Amérique
Numéro de la demande 13289010
Date de la demande 04.11.2011
Numéro de publication 20120286985
Date de publication 15.11.2012
Numéro de délivrance 08537041
Date de délivrance 17.09.2013
Type de publication B2
CIB
H03M 1/66
HÉLECTRICITÉ
03CIRCUITS ÉLECTRONIQUES FONDAMENTAUX
MCODAGE, DÉCODAGE OU CONVERSION DE CODE, EN GÉNÉRAL
1Conversion analogique/numérique; Conversion numérique/analogique
66Convertisseurs numériques/analogiques
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 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
Déposants Chandrasekaran Rajiv
Andrew LLC
Vella-Coleiro George P.
Inventeurs Chandrasekaran Rajiv
Vella-Coleiro George P.
Mandataires Mendelsohn, Drucker & Dunleavy, P.C.
Mendelsohn Steve
Titre
(EN) Interpolation-based digital pre-distortion architecture
Abrégé
(EN)

A non-linear amplifier is linearized using interpolation-based digital pre-distortion (DPD). In one embodiment, the digital input signal is interpolated to generate a higher-sample-rate signal that is then pre-distorted. The resulting higher-sample-rate pre-distorted signal is then decimated to generate a final pre-distorted digital signal that is converted into an analog pre-distorted signal by a digital-to-analog converter (DAC) before being applied to the amplifier. In a polyphase embodiment, different versions of the original input digital signal are generated, where each version is then pre-distorted using a different DPD module to generate a different intermediate pre-distorted digital signal. The intermediate pre-distorted signals are filtered and combined to generate the final pre-distorted digital signal. In both embodiments, better linearization (e.g., less aliasing) can be achieved without increasing the sample rate of the DAC and, in the polyphase embodiment, without increasing the processing speed of the DPD modules.

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