An Effective Spatial Modulation Based Scheme for Indoor VLC Systems

Shimaa Naser, Lina Bariah, Sami Muhaidat, Mahmoud Al-Qutayri, Paschalis C. Sofotasios

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Abstract

We propose an enhanced spatial modulation(SM)-based scheme for indoor visible light communication systems. This scheme enhances the achievable throughput of conventional SM schemes by transmitting higher order complex modulation symbol, which is decomposed into three different parts. These parts carry the amplitude, phase, and quadrant components of the complex symbol, which are then represented by unipolar pulse amplitude modulation(PAM) symbols. Superposition coding is exploited to allocate a fraction of the total power to each part before they are all multiplexed and transmitted simultaneously, exploiting the entire available bandwidth. At the receiver, a two-step decoding process is proposed to decode the active light emitting diode index before the complex symbol is retrieved. It is shown that at higher spectral efficiency values, the proposed modulation scheme outperforms conventional SM schemes with PAM symbols in terms of average symbol error rate(ASER), and hence, enhancing the system throughput. Furthermore, since the performance of the proposed modulation scheme is sensitive to the power allocation factors, we formulated an ASER optimization problem and propose a sub-optimal solution using successive convex programming(SCP). Notably, the proposed algorithm converges after only few iterations, whilst the performance with the optimized power allocation coefficients outperforms both random and fixed power allocation.

Original languageEnglish
Article number7314111
JournalIEEE Photonics Journal
Volume14
Issue number1
DOIs
Publication statusPublished - 2022
Publication typeA1 Journal article-refereed

Keywords

  • Error rate
  • Indexes
  • Light emitting diodes
  • Modulation
  • modulation
  • Optimization
  • optimization
  • power allocation
  • Resource management
  • Spectral efficiency
  • Visible light communication
  • visible light communications

Publication forum classification

  • Publication forum level 1

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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