A Hybrid Domain Framework for Predistorter Modeling and Adaptive Digital Predistortion Realization

In this paper, we propose a hybrid domain framework to model the predistorter (PD) of a power amplifier (PA). It is available for obtaining the PD not only through a PA model but also a PA circuit on ADS. Simulation results show that with predistortion, the NMSE of the linearity can reach -50 dB and the ACPR can reduce around 17dB. What's more, a processing unit is designed to work with the PD, so that the PD's coefficients can adjust to the changes of the PA adaptively, making the PA perform great linear in the transmitter system. The proposed framework is a helpful guidance for the design of circuits.