Adaptive Unipolar MIMO-OFDM for Visible Light Communications

Mohamed Al-Nahhal, Ertugrul Basar, Murat Uysal

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Unipolar orthogonal frequency division multiplexing (U-OFDM) appears as an attractive optical OFDM solution for emerging visible light communication (VLC) systems. This paper proposes spectral efficiency improvement for U-OFDM systems by applying adaptive transmission over realistic VLC links. This adaptive transmission includes switching among a number of multiple-input multiple-output (MIMO) modes combined with appropriate modulation size selection. The considered MIMO modes are repetition coding, spatial modulation, and spatial multiplexing, where each mode supports different modulation sizes. The selection of the corresponding MIMO mode and its modulation size is based on the received signal-to-noise ratio and target bit error rate. The proposed U-OFDM system is applied over different VLC MIMO setups with realistic channel models for 8 × 8, 4 × 4 and 2 × 2 MIMO systems. Our simulation results show that the proposed adaptive system provides a significant spectral efficiency improvement over stand-alone U-OFDM MIMO modes/setups.

Original languageEnglish (US)
Title of host publication2019 European Conference on Networks and Communications, EuCNC 2019
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages5
ISBN (Electronic)9781728105468
StatePublished - Jun 2019
Event28th European Conference on Networks and Communications, EuCNC 2019 - Valencia, Spain
Duration: Jun 18 2019Jun 21 2019

Publication series

Name2019 European Conference on Networks and Communications, EuCNC 2019


Conference28th European Conference on Networks and Communications, EuCNC 2019


  • MIMO modes switching
  • Visible light communication
  • adaptive transmission
  • repetition coding
  • spatial modulation
  • spatial multiplexing.
  • unipolar OFDM

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Hardware and Architecture
  • Safety, Risk, Reliability and Quality


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