Linearization performance for a polar work function predistorter

Abstract

We present a polar work function predistorter (WFP) which shows good RF amplifier linearization performance and wideband capability. We describe a DSP optimization scheme that allows the linearizer to adapt and maintain optimum out-of-band performance. We further describe a simulator that accurately models the performance of the system and predicts dynamic distortion due to the WFP implementation as well as an unexpected nonlinear optimum solution for the am-to-am distortion compensation.