Prédistorsion NARMA d'un amplificateur de puissance RF à caractéristique non monotone et conception d'une plateforme de prédistorsion flexible

Abstract

In order to increase the energy efficiency of RF power amplifiers, the use of hardware reconfiguration mechanisms has been suggested in the literature. In such circumstances, the non-linear effects may worsen to the point where the input/output curve of the amplifier becomes non-monotonic. Software predistortion techniques allow improving the linearity of RF power amplifiers. Some of them take the memory effect into account. This is the case of a NARMA predistortion method which is particularly useful because of its ease of use in a development environment. In the case of an amplifier whose characteristic is non-monotonic, it is difficult to obtain a NARMA predistortion model quickly in a deterministic fashion. After a mathematical analysis of the problem, this work introduces an explicit equation that allows to quickly and deterministically computing a NARMA predistortion module. This equation has been translated into an algorithm that has been tested in a simulation. Finally, the design of a partially implemented predistortion system is detailed. The purpose of this system is to accelerate development by providing a flexible and easily configurable system.

Date	2 Oct 2014
Original language	French
Awarding Institution	École de technologie supérieure
Supervisor	Nicolas Constantin (Supervisor) & Ammar B. Kouki (Co-supervisor)