Visible Light Communication Channel Models and Simulation of Coal Workface Energy Coupling

Zhai, Yanrong; Zhang, Shen

doi:10.1155/2015/271352

Cited by 18 publications

(13 citation statements)

References 14 publications

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“…Despite the fact that its results are obtained by simulating a tunnel scenario, the channel model limits them because it does not consider factors such as shadowing or scattering. In [24], the first analysis of a VLC channel model that considers an intrinsic characteristic of mines, such as dust particles, is presented. This paper studies the effects of coal dust particles in terms of the optical signal degradation.…”

Section: B Work Related To Underground Mining Vlc Channel Modelsmentioning

confidence: 99%

A VLC Channel Model for Underground Mining Environments With Scattering and Shadowing

et al. 2020

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Underground mining is an industry that preserves the miners' safety and efficiency in their work using wireless communication systems as a tool. In addition to communication links characterized by radio frequency signals, optical links in the visible light spectrum are under intense research for underground mining applications due to their high transmission rates and immunity to electromagnetic interference. However, the design of a robust visible-light communication (VLC) system for underground mining is a challenging task due to the harsh propagation conditions encountered in mining tunnels. To assist researchers in the design of such VLC systems, we present in this paper a novel channel model that incorporates important factors that influence the quality of the VLC link in underground mines. Features such as an arbitrary positioning and orientation of the optical transmitter and receiver, tunnels with irregular walls, shadowing by large machinery, and scattering by dust clouds are considered. These factors are integrated into a single modeling framework that lends itself for the derivation of compact mathematical expressions for the overall DC gain, the impulse response, the root mean square delay spread, and the received power of the proposed VLC channel model. Our analytical results are validated by computer simulations. These results show that the rotation and tilt of the transmitter and receiver, as well as the tunnels' irregular walls have a notorious influence on the magnitude and temporal dispersion of the VLC channel's line of sight (LoS) and non-LoS components. Furthermore, results show that shadowing reduces the LoS component's magnitude significantly. Our findings also show that scattering by dust particles contributes slightly to the total VLC channel gain, although it generates a large temporal dispersion of the received optical signal. INDEX TERMS Channel impulse response, channel modeling, scattering, shadowing, underground mining, visible light communication.

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Section: B Work Related To Underground Mining Vlc Channel Modelsmentioning

confidence: 99%

A VLC Channel Model for Underground Mining Environments With Scattering and Shadowing

et al. 2020

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“…An interesting analysis of VLC in hostile environments is applied in [8], where an energy coupling model of a VLC system applied to a coal mine is addressed, specifically a theoretical study of the effects of coal dust particles on VLC and the problem of optical signal degradation is performed. As a result, an optimal position of the optical transmitter is found, to maximize the coupled energy.…”

Section: Vlc Channel Models Applied To Underground Mining Environmentsmentioning

confidence: 99%

“…All these challenges are presented as opportunities for proposals for emerging and complementary communications systems that optimize communication and lighting of underground mining environments. To fulfill these requirements, the concept of visible light communication (VLC) has been introduced for underground mining communication [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Interference Mitigation for Visible Light Communications in Underground Mines Using Angle Diversity Receivers

Játiva

Cañizares

Azurdia-Meza

et al. 2020

Sensors

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This paper proposes two solutions based on angle diversity receivers (ADRs) to mitigate inter-cell interference (ICI) in underground mining visible light communication (VLC) systems, one of them is a novel approach. A realistic VLC system based on two underground mining scenarios, termed as mining roadway and mine working face, is developed and modeled. A channel model based on the direct component in line-of-sight (LoS) and reflections of non-line-of-sight (NLoS) links is considered, as well as thermal and shot noises. The design and mathematical models of a pyramid distribution and a new hemi-dodecahedral distribution are addressed in detail. The performances of these approaches, accompanied by signal combining schemes, are evaluated with the baseline of a single photo-diode in reception. Results show that the minimum lighting standards established in both scenarios are met. As expected, the root-mean-square delay spread decreases as the distance between the transmitters and receivers increases. Furthermore, the hemi-dodecahedron ADR in conjunction with the maximum ratio combining (MRC) scheme, presents the best performance in the evaluated VLC system, with a maximum user data rate of 250 Mbps in mining roadway and 120 Mbps in mine working face, received energy per bit/noise power of 32 dB and 23 dB, respectively, when the bit error rate corresponds to 10 − 4 , and finally, values of 120 dB in mining roadway and 118 dB in mine working face for signal-to-interference-plus-noise ratio are observed in a cumulative distribution function.

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“…In terms of system modeling or communication channel characterization, underground mining VLC scenarios are more challenging to characterize compared to a typical indoor VLC scenario [9]. Being an underground mine composed of small irregular tunnels, various factors that do not appear in indoor VLC environments must be considered, such as non-flat walls, angular position of the LEDs and PDs, dust particles [10] and shadowing. Since modeling the channel in all communication systems is an important stage for its correct design and operation, there is growing research associated with the characterization of the underground mining VLC channel [9], [10], [11].…”

Section: Introductionmentioning

confidence: 99%

“…Being an underground mine composed of small irregular tunnels, various factors that do not appear in indoor VLC environments must be considered, such as non-flat walls, angular position of the LEDs and PDs, dust particles [10] and shadowing. Since modeling the channel in all communication systems is an important stage for its correct design and operation, there is growing research associated with the characterization of the underground mining VLC channel [9], [10], [11]. However, and to the authors' best knowledge, none of these studies have presented a precise VLC mining channel model that characterizes all the details and factors that affect these scenarios.…”

Section: Introductionmentioning

confidence: 99%

Propagation Features that Affect an Underground Mining Visible Light Communication Link

Játiva¹,

Azurdia²,

Seguel³

et al. 2020

Anais De XXXVIII Simpósio Brasileiro De Telecomunicações E Processamento De Sinais

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Underground mining is an industry that supplies great income for several countries worldwide. Therefore, it is necessary to provide a proper communications infrastructure to this industry. Nevertheless, as is well known, underground mines are very hostile environments, making it difficult to implement current radio frequency (RF) communication technologies. Therefore, a practical and viable solution is given by systems based on visible light communication (VLC). This emerging technology can provide robust communication and continuous lighting in harsh environments. However, an exhaustive study of the use of VLC and its technical parameters in underground mines has not been carried out in detail. In this paper, we propose an introductory study of the main physical features present in an underground mining VLC environment. We also briefly discuss certain particular physical factors that affect underground mines, such as shadowing and scattering. This analysis generates a benchmark to develop a precise analytical VLC channel model of underground mining as future work.

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Visible Light Communication Channel Models and Simulation of Coal Workface Energy Coupling

Cited by 18 publications

References 14 publications

A VLC Channel Model for Underground Mining Environments With Scattering and Shadowing

A VLC Channel Model for Underground Mining Environments With Scattering and Shadowing

Interference Mitigation for Visible Light Communications in Underground Mines Using Angle Diversity Receivers

Propagation Features that Affect an Underground Mining Visible Light Communication Link

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