Corpus ID: 53868456

High speed train communications systems using free space optics

  title={High speed train communications systems using free space optics},
  author={R. Paudel and H. Minh and Zabih Ghassemlooy and M. Iaz and S. Rajbhandari},
In this work, we propose a broad-band free space optical (FSO) wireless communications system for high-speed trains. The system consists of optical transceivers positioned outside the train and along the railway track. The train receivers are in the coverage area of base stations positioned along the railway track to ensure continuous link availability. In this paper, we present modelling of two cases for over-ground and underground train systems before embarking to practically implement the… Expand
On-Board and Train-to-Wayside Free Space Optical Link: Design and Characterization
A free space optical (FSO) communication link is designed, implemented, and tested at different data rates reaching 5 Mb/s and results showed full train track coverage of 90 cm is achieved using the 13-LED, where the 3-LED was limited to 85 cm. Expand
On Divergence-Angle Efficiency of a Laser Beam in Free-Space Optical Communications for High-Speed Trains
The proposed range of divergence angles provides a large link range and effective coverage length, and contact time as compared to a narrow beam, and overcome the negative effects of train vibrations by using a proposed divergence-angle range for a wide beam. Expand
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This chapter is dedicated to all the railway applications requiring broadband wireless communications. The works focus especially on the way to provide Internet access on board trains. The differentExpand
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There is a huge demand for seamless high-speed communications in fast moving trains. People want broadband services while on board as in their home or in the workplace. This demand drives theExpand
BER Characteristic of Ground-to-Train Communication System Using Free-Space Optics Technology
We propose a ground-to-train communication system using free-space optics between a train and the ground. In this paper, we evaluate BER characteristic in outdoor experiment using test train. TheExpand
Experiment on Regional Broadband Network Using Free-Space-Optical Communication Systems
The transmission of a free-space optical (FSO) beam through the atmosphere is influenced by several factors: chief among them are weather conditions such as fog, rain, and snow. In the design of FSOExpand
A study on optical wireless train communication system using mobile object tracking technique
This paper proposes a new ground-to-train communication system using mobile object tracking technique thinking that can realize enough transmission speed on the moving train and proposes the tracking control algorithm of beacon light using the wide-angle lens and the telephoto lens. Expand
A gigabit/s indoor optical wireless system for Home Access Networks
  • H. Minh, D. O’brien, G. Faulkner
  • Computer Science
  • 2010 7th International Symposium on Communication Systems, Networks & Digital Signal Processing (CSNDSP 2010)
  • 2010
A bi-directional 1.25 Gbit/s system which can operate up to 4m without error under normal office lighting conditions is reported, and HD video streams were successfully transmitted between computers using the system. Expand
The Influence of Dense Fog on Optical Wireless Systems, Analysed by Measurements in Graz for Improving the Link-Reliability
Free space optics (FSO) has gained considerable importance in this decade of demand for high bandwidth transmission capabilities. FSO can provide a feasible solution for the last mile access problem,Expand
Evaluation of coverage area for a wide line-of-sight indoor optical free-space communication system employing coherent detection [optical wireless communications]
Results show that MSM photo-detectors result in a greater coverage area than their PIN counterparts, and a 200 Mb/s LOS optical link which uses coherent detection is reported, to demonstrate the viability of implementing coherent detection indoors. Expand
Performance analysis of free-space optical communication systems over atmospheric turbulence channels
These fading models describe the atmospheric turbulence because of its very good agreement with experimental measurement data and can be used as an alternative to time-consuming Monte-Carlo simulations. Expand
SWiFT: A Novel Architecture for Seamless Wireless Internet for Fast Trains
A novel technology referred as Seamless Wireless internet for Fast Trains (SWiFT) is proposed, which relies on a fast handoff mechanism by layer 2 (L2) triggering using a confidence factor (a probabilistic value evaluated by high speed movement and signal strength, to decide handoff). Expand
Demonstration of 16 channels 10 Gb/s WDM free space transmission over 2.16 km
We present the results of 16x10 Gb/s free space optical transmission over 2.16 km. The results show that in the normal weather, the bit error rate (BER) can reach 10-8 on either sunny or cloudy days.