Single Digital Predistortion Technique for Phased Array Linearization
Paper in proceedings, 2019

In this paper, we present a novel and effective linearization technique for nonlinear phased array antennas. For large phased arrays, linearization of the array using a single digital predistortion (DPD) is inevitable since one digital path is upconverted and feeds several RF transmission paths, each of which is connected to a power amplifier (PA) and an antenna element. However, a critical issue is that the PA characteristics can vary considerably within an array. Thus, linearizing individual PAs with one DPD is rather challenging. We formulate and solve an optimization problem that corresponds to jointly minimizing the maximum residuals between the input to the array and the output of individual PAs. We demonstrate that the proposed technique outperforms state-of-the-art linearization solutions while retaining the linear gain of the array.

MIMO

phased array

digital predistortion

linearization

single DPD

Author

Sara Hesami

Maynooth University

Sina Rezaei Aghdam

Chalmers, Electrical Engineering, Communication and Antenna Systems, Communication Systems

Christian Fager

Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics, Microwave Electronics

Thomas Eriksson

Chalmers, Electrical Engineering, Communication and Antenna Systems, Communication Systems

Ronan Farrell

Maynooth University

John Dooley

Maynooth University

2019 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS (ISCAS)

0271-4302 (ISSN)

2019 IEEE International Symposium on Circuits and Systems (ISCAS)
Sapporo, Japan,

Subject Categories

Computational Mathematics

Signal Processing

Discrete Mathematics

DOI

10.1109/ISCAS.2019.8702811

ISBN

9781728103976

More information

Latest update

11/11/2019