Magnitude and Wrap-Phase OFDM for MIMO Visible Light Communication Systems

Mohamed Al-Nahhal, Ertugrul Basar, Murat Uysal

Research output: Contribution to journalArticlepeer-review

Abstract

Generalized light emitting diode (LED) index modulation (GLIM) has been proposed as an effective multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) scheme for visible light communications (VLC) systems. In this letter, we propose a magnitude and wrap-phase OFDM (MW-OFDM) scheme for MIMO VLC systems. The proposed MW-OFDM system relies on the conversion of complex signals into polar form with the magnitudes and wrap-phases to decrease the restriction on the number of LEDs compared to the conventional GLIM-OFDM. Furthermore, maximum likelihood and best linear unbiased estimators of the proposed scheme are derived. The proposed MW-OFDM scheme improves the average bit error rate and provides a significant reduction in the decoding complexity, compared to the GLIM-OFDM. Moreover, a half number of LEDs are required for the proposed scheme to deliver the same spectral efficiency in a comparison with the GLIM-OFDM. Numerical results are presented over MIMO VLC channels to elaborate the superiority of our proposed scheme.

Original languageEnglish (US)
Article number9391670
Pages (from-to)2324-2328
Number of pages5
JournalIEEE Communications Letters
Volume25
Issue number7
DOIs
StatePublished - Jul 2021

Keywords

  • Visible light communications
  • decoding complexity
  • maximum likelihood estimator
  • multiple-input multiple-output
  • orthogonal frequency division multiplexing

ASJC Scopus subject areas

  • Modeling and Simulation
  • Computer Science Applications
  • Electrical and Electronic Engineering

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