Nous avons le plaisir de vous annoncer le séminaire de  

Tayeb BOUAZZA, Maître de conférences, Equipe ES,  portant sur "Modelling and linearisation of radio communication amplifiers in a reconfigurability context."

Le 28/03/2024 à 13h15  via Teams. 

Résumé :

Power efficiency is an important factor in new communications standards, and the power amplifier (PA) plays a major role in the energy balance of wireless transmitters. To improve its efficiency, the PA must be used close to its saturation zone. This leads to distortions of the transmitted signal in time and frequency domains. In addition, with the evolution of wireless transmission systems, different standards and norms have emerged. In order to ensure portability between these different networks, multi-standard RF systems have been developed to support several standards at the same time. The implementation of reconfigurable modules, including amplifiers, is a solution to guarantee the transition from one standard to another. For such applications, given the variable behavior of the PA in relation to different operating conditions, the modelling of its behavior or its linearization system becomes more complex. In the framework of our work, we have conducted a study on the modelling and linearization of reconfigurable PAs, and more precisely, on their non-linear behavior, which is variable depending on the waveform. The most classical method consists in parallelizing several models that correspond to the different operating conditions, with the major disadvantage of the high complexity and size of the model. Another method consists of decomposing the model into a common mode, which represents the nominal behavior of the PA, and a variable differential mode depending on the targeted application. In this context, we proposed a new block model called FWMP (Feedback-Wiener Memory Polynomial model) which allows the application of this approach. We also present the parametric estimation procedure associated with this model.The proposed model is validated, through simulations and experiments, using different PAs and waveforms from civil and aeronautical applications. The results obtained show that the FWMP model has good performances comparable to the state of the art in terms of modeling and linearization of radio communication power amplifiers.