Digital predistortion for linearity improvement of vcsel-ssmf-based radio-over-fiber links

Muhammad Usman Hadi, Pier Andrea Traverso, Giovanni Tartarini, Olivier Venard, Genevieve Baudoin, Jean Luc Polleux

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

This letter unfolds a digital predistortion (DPD) technique that improves the linearity of limited range mobile front haul links for the contemporary long-term evolution (LTE) and future (5G) networks. In particular, the proposed technique is applied to radio-over-fiber links based on single-mode (SM) vertical cavity surface emitting lasers emitting at 850 nm and standard SM fibers. Both the memory and generalized memory polynomial models are exploited for the predistorter and identified by utilizing indirect learning architecture. The impact of the DPD technique is observed by the link performance improvement in terms of normalized mean square error and adjacent channel power ratio, referring to complete LTE frames of 10 ms occupying 5-MHz bandwidth and having 64-quadrature amplitude modulation format. Furthermore, the effectiveness of the DPD approach, when varying input power levels, is investigated. The experimental results demonstrate the capability of the proposed DPD technique to achieve promising linearization performance.

Original languageEnglish
Article number8603760
Pages (from-to)155-157
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Volume29
Issue number2
Early online date7 Jan 2019
DOIs
Publication statusPublished - 1 Feb 2019

Bibliographical note

Publisher Copyright:
© 2001-2012 IEEE.

Keywords

  • Adjacent channel power ratio (acpr)
  • Digital predistortion (dpd)
  • Indirect learning architecture (ila)
  • Long-term evolution (LTE)
  • Normalized mean square error (nmse)
  • Radio-over-fiber (rof)
  • Vertical cavity surface emitting lasers (vcsels)

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