A polar-oriented Volterra model for power amplifier characterization

This paper addresses power amplifier (PA) behavioral models that are based on the low-pass equivalent Volterra series approach. As the PA is a band-pass system, the model that processes the complex envelope of the input signal is restricted to the generation of only the first zone output components. It is shown here that such restriction has been interpreted in a too conservative way in the conventional Volterra series based models. Alternatively, we propose a new model formulation which incorporates the band-pass restriction in a more suitable way, significantly increasing the flexibility of the Volterra-based PA models in general.