Investigation of FSO ground-to-train communications in a laboratory environment

Paudel, Rupak; Ghassemlooy, Zabih; Minh, Hoa Le; Rajbhandari, Sujan; Livingstone, B.

doi:10.1109/ahici.2011.6159575

Cited by 8 publications

(10 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This assumption is valid only when the RXA radius r RX is much smaller than the beam half-width w, as was also in this case. The dashed line shows the result of the analysis respecting the Gaussian variation of the optical intensity at RXA according to Equation (14). Finally, the solid line joins the measured attenuation points (marked with a + sign).…”

Section: Experimental Verification and Discussionmentioning

confidence: 95%

“…A comparison of the simulated performance of the system and experiments was performed in two experiments. The first experiment was aimed to compare the results of the circular beam model with its model based on Equations (12) and (14) and experimental results. The second experiment compares the geometrical loss of elliptical beam according to Equations (7) and (8).…”

Section: Experimental Verification and Discussionmentioning

confidence: 99%

“…There are, however, special (dedicated) FSO links for mobile applications, where horizontally symmetrical Gaussian beams may be beneficial. In the case of a ground-to-train FSO links reported in [14], using the elliptical Gaussian beam increases the link coverage thanks to a more efficient optical power distribution in the horizontal plane.…”

Section: Experimental Verification and Discussionmentioning

confidence: 99%

“…This approach has a great advantage in FSO link budget as will be shown later because we only need to stretch out the beam half-width in the desired direction instead of increasing the whole circular beam diameter. A similar aspect has been in studied in [14], where in order to optimise the ground-to-train FSO link performance, the main axis was oriented horizontally.…”

Section: Statistical Point Of Viewmentioning

confidence: 99%

See 3 more Smart Citations

On the derivation of exact analytical FSO link attenuation model

Poliak

Pezzei

Barcik

et al. 2014

Trans. Emerging Tel. Tech.

View full text Add to dashboard Cite

The development of semiconductor technology has led to an increase of the usable bandwidth of light-emitting diodes (LED), which are suitable for indoor high-speed communications or free-space optical (FSO) communications over a relatively short distance. The high-speed long-distance FSO links, where turbulence effects are considerably high, are a domain of laser sources. Hence, the paper covers the study of an exact analytical model of FSO link attenuation and the benefits of using an elliptically symmetrical Gaussian beam rather than a circularly symmetrical one.The paper further generalises the study to the FSO link misalignment and the pointing error analysis. The main contribution is in the derivation of an exact laser beam attenuation model, which is further used to analyse the geometrical losses in FSO systems as well as a general misalignment of an elliptically symmetrical beam in any direction from a circular receiver aperture. The challenging mathematical part includes two and six expressions of the general laser beam attenuation model for FSO communications taking into consideration circular and elliptical beams, respectively. The paper concludes with an analysis of advantages of using elliptical beams in FSO systems and a discussion on optimal orientation of the major beam axis with respect to the maximisation of the link availability.The paper summarises some previous results of the team of authors to further extend the model's applicability into more general terms towards a unified model.

show abstract

Section: Experimental Verification and Discussionmentioning

confidence: 95%

Section: Experimental Verification and Discussionmentioning

confidence: 99%

Section: Experimental Verification and Discussionmentioning

confidence: 99%

Section: Statistical Point Of Viewmentioning

confidence: 99%

See 2 more Smart Citations

On the derivation of exact analytical FSO link attenuation model

Poliak

Pezzei

Barcik

et al. 2014

Trans. Emerging Tel. Tech.

View full text Add to dashboard Cite

show abstract

“…Effects of atmospheric turbulence were ignored since refractive index fluctuations are negligible for a moving train. Experimental investigation of G2T FSO was conducted to further evaluate the performance of the system under real scenarios [34] [35].Overground train and underground models managed to deliver up to 155Mbps with basic modulation format over 1.5mm with no errors. Also, train's roof turbulence effects were examined in study [35].…”

Section: Overeview Of G2t Fso Communications Fso G2t Systemmentioning

confidence: 99%

FSO G2T communications in tropical climate: An overview

Mabrouk

Abdullah

2017

AIP Conference Proceedings

View full text Add to dashboard Cite

Abstract.As the demand for high-speed broadband data access on trains increases, so does the interest in finding solutions to satisfy this demand. This paper aims to provide an overview of Free Space Optical (FSO) Link for Ground-to-Train Communication(G2T). It focuses on tropical climate, with illustrations of the technology Challenges, and opportunities. Railway communication challenges are discussed with recent research work. Additionally, FSO G2T modeling techniques for various track configurations are briefly discussed and summarized.

show abstract

Experimental demonstration of a 10BASE‐T Ethernet visible light communications system using white phosphor light‐emitting diodes

Burton¹,

Bentley²,

Minh³

et al. 2014

IET Circuits, Devices & Systems

Self Cite

View full text Add to dashboard Cite

In this study, a compact design of a highly efficient, and a high luminosity light-emitting diode (LED)-based visible light communications system is presented, which is capable of providing standard room illumination levels and also widecoverage Ethernet 10BASE-T optical wireless downlink communications over a distance of 2.3 m using commercial white light phosphor LEDs. The measured signal-to-noise ratio of the designed Ethernet system is >45 dB, thus allowing error-free communications with both on-off keying non-return zero and differential Manchester-coded modulation schemes at 10 Mbps. The uplink has been provided via a wireless infra-red link. A comparative study of a point-to-point wired local area network (LAN) and the optical wireless link confirms no discernible differences between them. The design of the transmitter is also shown to be scalable, with the frequency response for driving 25 LEDs being almost the same as driving a single LED. LED driving units are designed to match with the Ethernet sockets (RJ45) that conform to the existing LAN infrastructures (building and portable devices).

show abstract

Investigation of FSO ground-to-train communications in a laboratory environment

Cited by 8 publications

References 16 publications

On the derivation of exact analytical FSO link attenuation model

On the derivation of exact analytical FSO link attenuation model

FSO G2T communications in tropical climate: An overview

Experimental demonstration of a 10BASE‐T Ethernet visible light communications system using white phosphor light‐emitting diodes

Contact Info

Product

Resources

About