Title: Differential signaling spread-spectrum modulation of the LED visible light wireless communications using a mobile-phone camera
Authors: Chen, Shih-Hao
Chow, Chi-Wai
Department of Photonics
Keywords: Visible light communication (VLC);Optical wireless communication (OWC);Spread spectrum modulation (SSM)
Issue Date: 1-Feb-2015
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. (C) 2014 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.optcom.2014.10.025
ISSN: 0030-4018
DOI: 10.1016/j.optcom.2014.10.025
Volume: 336
Begin Page: 240
End Page: 242
Appears in Collections:Articles