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Neural-Network-Based Digital Predistortion for Active Antenna Arrays under Load Modulation

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Details

Original languageEnglish
Pages (from-to)843-846
Number of pages4
JournalIEEE Microwave and Wireless Components Letters
Volume30
Issue number8
DOIs
Publication statusPublished - 1 Aug 2020
Publication typeA1 Journal article-refereed

Abstract

In this letter, we propose an efficient solution to linearize mmWave active antenna array transmitters that suffer from beam-dependent load modulation. We consider a dense neural network that is capable of modeling the correlation between the nonlinear distortion characteristics among different beams. This allows providing consistently good linearization regardless of the beamforming direction, thus avoiding the necessity of executing continuous digital predistortion parameter learning. The proposed solution is validated, conforming to 5G new radio transmit signal quality requirements, with extensive over-the-air RF measurements utilizing a state-of-the-art 64-element active antenna array operating at 28-GHz carrier frequency.

Keywords

  • 5G new radio (NR), digital predistortion (DPD), load modulation, mmWave, neural networks (NNs), nonlinear distortion

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