A Cross-Mode Universal Digital Pre-Distortion Technology for Low-Sidelobe Active Antenna Arrays in 5G and Satellite Communications

Yunfeng Li, Yonghui Huang*, Martin Hedegaard Nielsen, Feridoon Jalili, Wei Wei, Jian Ren, Yingzeng Yin, Ming Shen, Gert Frølund Pedersen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

A cross-mode universal digital pre-distortion (CMUDPD) technology is proposed here to linearize low-sidelobe active antenna arrays with non-uniform fixed power levels for each branch, which are desired in satellite communications with stringent requirements to minimize interference. In low-sidelobe arrays formed by nonuniform amplitude excitation, conventional digital pre-distortion (DPD) techniques require multiple feedback paths for either one-to-one or average linearization of the PAs, which increases system complexity and is infeasible for large-scale arrays. This is because the power amplifiers (PAs) usually operate in different modes where the supply voltages, bias voltages, and input power levels are different. The proposed CMUDPD method aims at solving this issue by intentionally arranging the PAs to work in different modes but with shared nonlinear characteristics. Based on the nonlinear correlation established among the PAs’ different operating modes, a single feedback path is sufficient to capture the common nonlinearity of all the PAs and determine the parameters of the CMUDPD module. The concept is explained in theory and validated by simulations and experiments using GaN PAs operating with three significantly different output power levels and two orthogonal frequency division multiplexing (OFDM) signal bandwidths.
Original languageEnglish
Article number2031
JournalElectronics
Volume10
Issue number16
Number of pages19
ISSN2079-9292
DOIs
Publication statusPublished - 22 Aug 2021

Keywords

  • Cross-mode universal digital pre-distortion (CMUDPD)
  • Low-sidelobe active antenna arrays
  • Nonlinear correlation
  • Power amplifiers (PAs)

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