Polynomial memory pre distortion for 5G wireless systems with multiple power amplifiers

Abstract

This paper presents a novel technique, based on digital signal processing, for nonlinear modeling and pre-distortion of multiple parallel power amplifiers in a beam-forming transmitter. By jointly estimating a mutual pre-distortion function that effectively compensates for the distortions experienced in the entire transmission system, the proposed method optimizes performance for a single digital pre-distortion system. This method exhibits superior performance of up to 5dB in EVM and PSD in transmitter KPI compared to the standard method, where the multiple PAs are pre-distorted using digital pre-distortion derived from a single arbitrary PA.