Comparison of neural network adaptive predistortion techniques for satellite down links

In this paper, we present adaptive predistortion techniques for two satellite down links. The first link is a memoryless amplifier that gives two kind of distortions: amplitude distortion (AM/AM conversion) and phase distortion (AM/PM conversion). The second link is an amplifier with memory modeled by a memoryless amplifier followed by a linear filter. Predistortions are realized with multilayer perceptron (MLP) neural networks (NN) associated with the backpropagation (BP) algorithm. For the first down link we compare two adaptive predistorsions whereas only one predistorsion technique is applied to the second down link.