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Experimental demonstration of digital predistortion for orthogonal frequency-division multiplexing-radio over fibre links near laser resonance

Vieira, Luis Carlos, Gomes, Nathan J. (2015) Experimental demonstration of digital predistortion for orthogonal frequency-division multiplexing-radio over fibre links near laser resonance. IET Optoelectronics, . pp. 1-7. ISSN 1751-8768. (doi:10.1049/iet-opt.2014.0160) (KAR id:48722)

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http://doi.org/10.1049/iet-opt.2014.0160

Abstract

Radio over fibre (RoF), an enabling technology for distribution of wireless broadband service signals through analogue optical links, suffers from non-linear distortion. Digital predistortion has been demonstrated as an effective approach to overcome the RoF non-linearity. However, questions remain as to how the approach performs close to laser resonance, a region of significant dynamic non-linearity, and how resilient the approach is to changes in input signal and link operating conditions. In this work, the performance of a digital predistortion approach is studied for directly modulated orthogonal frequency-division multiplexing RoF links operating from 2.47 to 3.7 GHz. It extends previous works to higher frequencies, and to higher quadrature amplitude modulation (QAM) levels. In addition, the resilience of the predistortion approach to changes in modulation level of QAM schemes, and average power levels are investigated, and a novel predistortion training approach is proposed and demonstrated. Both memoryless and memory polynomial predistorter models, and a simple off-line least-squares-based identification method, are used, with excellent performance improvements demonstrated up to 3.0 GHz.

Item Type: Article
DOI/Identification number: 10.1049/iet-opt.2014.0160
Subjects: T Technology
Divisions: Divisions > Division of Computing, Engineering and Mathematical Sciences > School of Engineering and Digital Arts
Depositing User: Tina Thompson
Date Deposited: 03 Jun 2015 13:27 UTC
Last Modified: 16 Feb 2021 13:25 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/48722 (The current URI for this page, for reference purposes)
Gomes, Nathan J.: https://orcid.org/0000-0003-3763-3699
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