Differential signaling spread-spectrum modulation of the LED visible light wireless communications using a mobile-phone camera

Shih Hao Chen*, Chi-Wai Chow

*Corresponding author for this work

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

Visible light communication (VLC) using spread spectrum modulation (SSM) and differential signaling (DS), detected by a mobile-phone camera is proposed and demonstrated for the first time to provide high immunity to background ambient light interference. The SSM signal provides the coding gain while the DS scheme enhances the clock recovery particular under high background ambient light. Experiment results confirm the feasibility of the proposed scheme, showing that the proposed system has 6-dB gain comparing with the traditional on-off keying (OOK) modulation under background ambient light of 3000 lux. The direct incident ambient light to the mobile-phone camera is 520 lux.

Original languageEnglish
Pages (from-to)240-242
Number of pages3
JournalOptics Communications
Volume336
DOIs
StatePublished - 1 Feb 2015

Keywords

  • Optical wireless communication (OWC)
  • Spread spectrum modulation (SSM)
  • Visible light communication (VLC)

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