Linearizing Active Antenna Arrays: Digital Predistortion Method and Measurements
Paper in proceeding, 2019
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.
power amplifiers
millimeter-waves
phased arrays
digital predistortion
5G NR
RF measurements
Author
Alberto Brihuega
University of Tampere
Mahmoud Abdelaziz
University of Tampere
Matias Turunen
University of Tampere
Thomas Eriksson
Chalmers, Electrical Engineering
Lauri Anttila
University of Tampere
M. Valkama
University of Tampere
2019 IEEE MTT-S International Microwave Conference on Hardware and Systems for 5G and Beyond, IMC-5G 2019
9160379
9781728131436 (ISBN)
2019 IEEE MTT-S International Microwave Conference on Hardware and Systems for 5G and Beyond, IMC-5G 2019
Atlanta, USA,
Atlanta, USA,
Subject Categories
Telecommunications
Signal Processing
Other Electrical Engineering, Electronic Engineering, Information Engineering
DOI
10.1109/IMC-5G47857.2019.9160379