Optimisation of chaos‐based coded modulations for compensation of amplifier non‐linearities

Abstract

The possibilities of a known class of chaos-based coded modulation (CCM) systems are expanded to address the problem of high-power amplifier (HPA) non-linearity. The hypothesis is that the CCM non-linear nature can be exploited to counteract its effects on the system perfomance, avoiding the need of a predistorter. An optimisation method for the design of the CCM to prove this hypothesis is proposed. The results show that, for a given back-off level, a non-linear mapping function for the chaos-based encoder and decoder can be designed to compensate the HPA effect on the error rate.