Visible Light Communication and Augmented Reality for Underground Positioning System

Riurean, Simona; Olar, Marius Leonard; Pellegrini, Lilla

doi:10.1051/matecconf/202030500089

Cited by 7 publications

(3 citation statements)

References 6 publications

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“…Figure 2 illustrates the relationship between the visibility and the attenuation coefficient in dB/km. This is thanks to Kim's model from Equation (7) for an RGB (red green blue) LED with peak wavelengths of 630, 530, and 475 nm, respectively. It is intuitive to conclude that, the clearer the sky, the smaller the attenuation coefficient is.…”

Section: Atmospheric Attenuationmentioning

confidence: 99%

“…The scale of visibility is not the same as in the previous case of weather conditions. Here, meters are used as opposed to kilometers, as in Equation (7). Visibility of at least 13 m is needed for a safe escape when someone is unfamiliar with the building.…”

Section: Smoke Attenuationmentioning

confidence: 99%

“…Nevertheless, it is highly relevant to pursue this research in the outdoor VLC scenario as more and more urban lights are becoming LED-based. Indeed, applications such as urban Li-Fi (which stands for Light Fidelity, the high data rate application of VLC), VLC positioning systems, VLC-IoT (Internet of Things), and V2V (Vehicle-to-Vehicle) or V2I (Vehicle-to-Infrastructure) make VLC an interesting candidate for outdoor short-range connectivity [6][7][8]. In those listed application cases, short-range refers to communication links up to a few meters away, as opposed to Free Space Optics (FSO) communication technology which often uses infrared LASER light for long-range communications over a few kilometers [9].…”

Section: Introductionmentioning

confidence: 99%

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Outdoor Visible Light Communication Channel Modeling under Smoke Conditions and Analogy with Fog Conditions

Georlette

Bette

Brohez

et al. 2020

Optics

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Visible Light Communication (VLC) has gained popularity in research and business in the last decade. This technology aims to combine lighting and communication into a single device. For now, this technology has been thoroughly studied for an indoor environment, but it is sufficiently mature nowadays to consider its outdoor-environment potentials. The key outdoor challenges are the weather variabilities and smoke particles in cities due to pollution or fires. The aim of this is the study and quantification of the weather and smoke particles’ impact on a short-range optical communication thanks to a simulator. This article’s novelty is the inclusion of the effects of smoke in a short-range outdoor VLC system channel model. This smoke model, which comes from the fire engineering field, states that smoke attenuation is independent of the wavelength, starting from high visibility to 5 m. The visibility represents the distance up to which an object can be distinguished against the background. The effects of fog and smoke are studied in the case of two outdoor VLC scenarios. Smoke and fog models have analogous equations to express the optical attenuation they induce, using the visibility concept. Taking into account the actual light-emitting diode (LED) lamp radiation pattern, the simulator computes the power at the receiver side and the channel attenuation coefficients for a given fog or/and smoke outdoor setting. The main result drawn in this paper is that the channel attenuation levels due to fog and smoke are both in the same order of magnitude, starting from the visibility of about 1 km. The attenuation induced by fog is higher under this threshold of 1 km.

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Section: Atmospheric Attenuationmentioning

confidence: 99%

Section: Smoke Attenuationmentioning

confidence: 99%