Optimal Positioning of Ground Base Stations in Free-Space Optical Communications for High-Speed Trains

Sina Fathi-Kazerooni, Yagiz Kaymak, Roberto Rojas-Cessa, Jianghua Feng, Nirwan Ansari, Mengchu Zhou, Tairan Zhang

Research output: Contribution to journalArticlepeer-review

37 Scopus citations


In this paper, we propose two different free-space-optics (FSO) coverage models for next-generation high-speed-train communications. To the best of our knowledge, these are the first coverage models proposed for FSO seamless handover. The models provide different coverage areas for performing seamless signal handover and uninterrupted ground-to-train communication. The first model uses two different wavelengths in adjacent covered areas and the second one uses a single wavelength. We find the optimal distance from the train track to a ground base station and the distance between base stations to provide seamless connectivity and handover while minimizing the number of base stations along the track. We base our estimations on a realistic model of an FSO system and provide numerical evaluations demonstrating the performance of the proposed coverage models. We show the different amounts of received power on ground-to-train communications as a function of the location of ground base stations. We also consider the effect of fog on the FSO link as the most attenuating condition for FSO communications. Our results show that communication rates of 1 Gpbs and higher may be achieved with the proposed station positioning and coverage models.

Original languageEnglish (US)
Pages (from-to)1940-1949
Number of pages10
JournalIEEE Transactions on Intelligent Transportation Systems
Issue number6
StatePublished - Jun 2018

All Science Journal Classification (ASJC) codes

  • Automotive Engineering
  • Mechanical Engineering
  • Computer Science Applications


  • FSO
  • Free-space optical communications
  • beam coverage
  • high-speed trains
  • laser-based optical links
  • optimal base station location


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