In this paper, we provide a novel framework for efficient digital predistortion (DPD) based linearization of active antenna arrays with multiple and mutually different nonlinear power amplifiers. The proposed method builds on the use of a combined feedback signal essentially characterizing the observable nonlinear distortion at the receiving end. The proposed method is validated with extensive over-the-air RF measurements on a 64-element active antenna array transmitter operating at 28 GHz carrier frequency and transmitting a 200 MHz wide 5G New Radio (NR) waveform. The obtained results demonstrate the excellent linearization capabilities of the proposed solution, which allows for a very efficient implementation in practical systems.
@article{arxiv.1907.07959,
title = {Linearizing Active Antenna Arrays: Method and Measurements},
author = {Alberto Brihuega and Mahmoud Abdelaziz and Matias Turunen and Thomas Eriksson and Lauri Anttila and Mikko Valkama},
journal= {arXiv preprint arXiv:1907.07959},
year = {2019}
}
Comments
Accepted for presentation in IEEE MTT-S International Microwave Conference on Hardware and Systems for 5G and Beyond, August 2019