Geolocation and communication in unfamiliar indoor environments through visible light

M. A. Vieira, Manuel Augusto Vieira, P. Louro, A. Fantoni, P. Vieira

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Citations (Scopus)


To support people's wayfinding activities in unfamiliar indoor environments, a method able to generate ceiling landmark route instructions using Visible Light Communication (VLC) is proposed. The system is composed of several transmitters (ceiling luminaries) which send the map information and path messages required to wayfinding. Mobile optical receivers, using joint transmission, extracts theirs location to perform positioning and, concomitantly, the transmitted data from each transmitter. Bidirectional communication between the emitters and the receivers is available in strategic optical access point. Typical scenarios are simulated and include finding places and guiding users across different floors. Data from the sender is encoded, modulated and converted into light signals emitted by the transmitters. Tetra-chromatic white sources are used, providing a different data channel for each chip. At the receiver, the modulated light signal, containing the ID and the 3D geographical position of the transmitter and wayfinding information, is received by SiC photodetectors with light filtering and demultiplexing properties. Since lighting and wireless data communication is combined, each luminaire for downlink transmission become a single cell, in which the optical access point (AP) is located. The coded light signals are interpreted directly by the receivers of the users positioned underneath. The effect of the location of the APs is evaluated and a model for the different cellular networks is analyzed. Orthogonal and hexagonal topologies are tested, and a 3D localization design, demonstrated by a prototype is presented. Uplink transmission is implemented and the 3D best route to navigate through venue calculated. The results show that the system make possible to determine the position of a mobile target inside the network, to infer the travel direction along the time and to interact with information received and optimize the route towards a static or dynamic destination.

Original languageEnglish
Title of host publicationLight-Emitting Devices, Materials, and Applications XXV
EditorsJong Kyu Kim, Michael R. Krames, Martin Strassburg
PublisherSPIE-International Society for Optical Engineering
ISBN (Electronic)9781510642478
Publication statusPublished - 6 Mar 2021
EventLight-Emitting Devices, Materials, and Applications XXV 2021 - Virtual, Online, United States
Duration: 6 Mar 202111 Mar 2021

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceLight-Emitting Devices, Materials, and Applications XXV 2021
Country/TerritoryUnited States
CityVirtual, Online


  • Bidirectional Communication
  • Geolocation
  • Indoor multi-level environments
  • Indoor navigation
  • Multiplexing/Demultiplexing
  • Optical sensors
  • Transmitter/Receiver
  • Visible Light Communication
  • Wayfinding


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