Open Science Research Excellence

Ali Gharsallah

Publications

2

Publications

2
11960
Application of the Neural Network to the Synthesis of Multibeam Antennas Arrays
Abstract:
In this paper, we intend to study the synthesis of the multibeam arrays. The synthesis implementation-s method for this type of arrays permits to approach the appropriated radiance-s diagram. The used approach is based on neural network that are capable to model the multibeam arrays, consider predetermined general criteria-s, and finally it permits to predict the appropriated diagram from the neural model. Our main contribution in this paper is the extension of a synthesis model of these multibeam arrays.
Keywords:
Multibeam, modelling, neural networks, synthesis,antennas.
1
13495
Behavioral Modeling Accuracy for RF Power Amplifier with Memory Effects
Abstract:
In this paper, a system level behavioural model for RF power amplifier, which exhibits memory effects, and based on multibranch system is proposed. When higher order terms are included, the memory polynomial model (MPM) exhibits numerical instabilities. A set of memory orthogonal polynomial model (OMPM) is introduced to alleviate the numerical instability problem associated to MPM model. A data scaling and centring algorithm was applied to improve the power amplifier modeling accuracy. Simulation results prove that the numerical instability can be greatly reduced, as well as the model precision improved with nonlinear model.
Keywords:
power amplifier, orthogonal model, polynomialmodel , memory effects.