VLCR: Detecting Battery-free Users with Visible Lights

DOI

10.2991/icismme-15.2015.25How to use a DOI?

Keywords

Cognitive Radio; visible light communication; RFID.

Abstract

This paper presents the design and implementation of VLCR (visible light cognitive radio), a cognitive radio system where the base station can detect and communicate with users in a battery-free manner on the visible light band. Contrary to previous systems, VLCR works at visible light frequencies, which makes detecting users much harder because of the broad bandwidth and the low power constraint it incurs. We solve the power constraint problem by using a retro-reflector that can effectively focus optical energy, returning all the energy back to the base station passively, and an liquid-crystal display (LCD) that can modulate visible light signals efficiently. We have prototyped VLCR and showed that VLCR saves 2-3 orders of magnitude more power than previous cognitive radio systems, and supports concurrent operations among multiple users in the office environment.

Copyright

© 2015, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Youling Zhou
AU  - Yongqin Yang
PY  - 2015/07
DA  - 2015/07
TI  - VLCR: Detecting Battery-free Users with Visible Lights
BT  - Proceedings of the First International Conference on Information Sciences, Machinery, Materials and Energy
PB  - Atlantis Press
SP  - 122
EP  - 126
SN  - 1951-6851
UR  - https://doi.org/10.2991/icismme-15.2015.25
DO  - 10.2991/icismme-15.2015.25
ID  - Zhou2015/07
ER  -