Trajectory redesign within a complex intersection for VLC ready connected cars

M. A. Vieira, M. Vieira, Paula Louro, Pedro Vieira

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

1 Citation (Scopus)


In order to serve the changing needs of road traffic control, the road space and road structure surrounding an intersection have evolved into complex forms. Using a new concept of request/response in a two-way-to-way traffic light controlled crossroad, the redesign of the trajectories can be accomplished by the application of methods for navigation, guidance and combination of expert knowledge of vehicle road traffic control. In this work, the communication between the Infrastructures and the Vehicles (I2V), between vehicles (V2V) and from the Vehicles to the Infrastructures (V2I) is performed through Visible Light Communication (VLC), using the street lamps and the traffic signaling to broadcast the information. Vehicle headlamps are used to transmit data to other vehicles or infrastructures, allowing digital safety and data privacy. Data 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. As receivers and decoders, SiC Wavelength Division Multiplexer (WDM) devices, with light filtering properties, are considered. The primary objective is to control the arrival of vehicles to an intersection and schedule them to cross at times that minimize traffic delay. A further objective is to allocate delays between left-turns and forward movements, moderating the speed and slot between vehicles travelling in these directions, maintaining a safe distance from one to another. Pedestrians and bicycles are also incorporated. An I2V2V2I traffic scenario is proposed, and bidirectional communication between the infrastructure and the vehicles is tested, using the VLC request/response concept. A phasing traffic flow is developed as a proof of concept. The experimental results confirm the cooperative VLC architecture, showing that communication between connected cars and infrastructures can be optimized using the mentioned request/response concept. A significant increase in traffic throughput with the least dependency on infrastructure is achieved.

Original languageEnglish
Title of host publicationNext-Generation Optical Communication: Components, Sub-Systems, and Systems IX
EditorsGuifang Li, Xiang Zhou
PublisherSPIE-International Society for Optical Engineering
ISBN (Electronic)9781510633810
Publication statusPublished - 2020
EventNext-Generation Optical Communication: Components, Sub-Systems, and Systems IX 2020 - San Francisco, United States
Duration: 5 Feb 20206 Feb 2020

Publication series

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


ConferenceNext-Generation Optical Communication: Components, Sub-Systems, and Systems IX 2020
Country/TerritoryUnited States
CitySan Francisco


  • Light Fidelity
  • OOK modulation scheme
  • SiC photodetectors
  • Traffic control
  • Vehicular Communication
  • Visible Light Communication
  • White LEDs


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