LACO-OFDM with Index Modulation for Optical Wireless Systems

Ali Waqar Azim, Yannis Le Guennec, Marwa Chafii, Laurent Ros

Research output: Contribution to journalArticlepeer-review


In this letter, we propose layered asymmetrically clipped optical-orthogonal frequency-division multiplexing (LACO-OFDM) with index modulation (IM), i.e., LACO-OFDM-IM for optical wireless systems. In classical LACO-OFDM, the spectral leakage because of out-of-band clipping harmonics increases the baseband bandwidth (BB) resulting in lower spectral efficiencies. For LACO-OFDM-IM, we use IM and optimize the BB by filtering the out-of-band clipping harmonics. This amalgamation of IM and BB optimization leads to better spectral efficiency (SE). Simulation results shall affirm that LACO-OFDM-IM achieves higher SE, affords a comprehensive granularity for SE/energy efficiency trade-off, and outperforms classical alternatives in terms of bit-error-rate in both line-of-sight and time-dispersive channels.

Original languageEnglish (US)
Article number9295380
Pages (from-to)664-667
Number of pages4
JournalIEEE Wireless Communications Letters
Issue number3
StatePublished - Mar 2021


  • Discrete Fourier transform
  • index modulation
  • intensity-modulation and direct-detection
  • optical wireless systems
  • orthogonal frequency-division multiplexing

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


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