Wideband power amplifier predistortion: Trends, challenges and solutions

This paper focuses on wideband power amplifier predistortion for current and future communications standards such as LTE and 5G. As a matter of fact, the large bandwidth and the large dynamic range of exchanged signals in these standards make the predistortion task very challenging. To overcome these challenges, innovations and improvements are needed in the three main blocks of the predistortion system, i.e., modeling and estimation algorithms, the transmission path and the observation path. In this work, for each of these three blocks, the state of the art is briefly presented and solutions are proposed to contribute in achieving a low power wideband predistortion compatible with the 5G low power transmission cells.