Distance-Range-Oriented Constellation Design for VLC-SCMA Downlink with Signal-Dependent Noise

Qian Gao, Shuping Hu, Chen Gong, Erchin Serpedin, Khalid Qaraqe, Zhengyuan Xu

Research output: Contribution to journalArticle

1 Citation (Scopus)


In this letter, the constellation design for a sparse code multiple access-based visible light communication downlink is studied. The noise at the receiving avalanche photodiode is dependent on the signal intensity, and the associated design problems are typically intractable. We point out that for such a system, both the minimum Euclidean distance (MED) and rotated-MED-based methods are not the optimal optimization objective, and propose a distance-range-oriented (DRO) modulation, where a linear combination of the minimum and maximum Euclidean distance is considered. We observe in the simulation results that the proposed DRO-based scheme outperforms the MED and rotated-MED-based ones across a wide range of signal and noise levels.

Original languageEnglish
Article number8610189
Pages (from-to)434-437
Number of pages4
JournalIEEE Communications Letters
Issue number3
Publication statusPublished - 1 Mar 2019



  • Constellation design
  • distance range
  • SCMA
  • signal-dependent noise
  • visible light communication

ASJC Scopus subject areas

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

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