Study on VLC Channel Modeling Under Random Shadowing

Dong, Zanyang; Shang, Tao; Gao, Yan; Li, Qian

doi:10.1109/jphot.2017.2775664

Cited by 32 publications

(25 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The authors present the objects that cause shadowing as cylinders by affecting the LoS and non-LoS components. Finally, in [30], the authors considers the behavior and dimensions of the objects that produce shadowing as similar as possible to what happens in an underground mining scenario. In addition, a joint probability distribution to characterize the size and the position of the obstructions is introduced.…”

Section: Scattering and Shadowing Models Applied To Vlc Indoor Nonmentioning

confidence: 99%

“…Then, in contrast to the studies reported in the literature, we included in the mathematical expressions of the LoS and non-LoS components of the proposed underground mining VLC channel model a weighting function to adequately describe the shadowing effect. This function is based on a Poisson process [30], which randomly describes the entry of objects in the underground mining VLC environment. Furthermore, to model the scattering effect, we considered the following premises: (1) The dust particles are uniformly distributed over a disc region centered on the installed PD in the helmet of the mining worker.…”

Section: Scattering and Shadowing Models Applied To Vlc Indoor Nonmentioning

confidence: 99%

“…However, vehicles entering the underground mining area can block certain optical links and partially attenuate the transmitted signal strength. According to the literature, shadowing applied to VLC systems has been modeled as a binomial Gaussian distribution [13] and as a Poisson process [30]. After a comparative analysis of models that fit the real characteristics of the shadowing phenomenon in underground mines, we follow and extrapolate to our analysis a statistical methodology for shadowing modeling [30].…”

Section: A Assumptions Considered To Model Shadowing Statisticallymentioning

confidence: 99%

See 2 more Smart Citations

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

et al. 2020

View full text Add to dashboard Cite

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.

show abstract

Section: Scattering and Shadowing Models Applied To Vlc Indoor Nonmentioning

confidence: 99%

Section: Scattering and Shadowing Models Applied To Vlc Indoor Nonmentioning

confidence: 99%

Section: A Assumptions Considered To Model Shadowing Statisticallymentioning

confidence: 99%

See 1 more Smart Citation

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

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Under the ''main spot'' model, the probability that a human sits at a particular location on the two-dimensional (2D) plane is modeled as a 2D Gaussian random variable with a higher probability density at certain main spots such as sofas and desks. In [12], humans enter a single room according to a Poisson process, where the rate of the Poisson process is varied. In addition, two scenarios are analyzed in the presence and absence of a single static obstacle in the single room.…”

Section: Relationship To the State Of The Artmentioning

confidence: 99%

“…Second, we see that the SNR for the signal from each LED has a concave shape produced when the mobile device moves at roughly constant speed. The peak is the point where the mobile device passes under the LED, and the curvature of the shape can be used in analytical fits to estimate at which points the SNR will be above the acceptable threshold for a given application in a VLC network 12 . Third, we see that hard handoff (under Selection Diversity) and MRC have comparable SNR performance due to the fact that the two LEDs in the corridor are not co-visible by the mobile device except when the mobile user is at the corner of the corridor.…”

Section: ) Selection Diversity Versus Maximal Ratio Combining For Momentioning

confidence: 99%

Characterization of Line-of-Sight Link Availability in Indoor Visible Light Communication Networks Based on the Behavior of Human Users

et al. 2020

View full text Add to dashboard Cite

We characterize the line-of-sight (LOS) link availability in indoor visible light communication (VLC) networks based on the behavior of human users. The VLC link availability is impacted by humans in three distinct ways: (1) Users turn the lights on or off in each room. (2) Users may carry mobile devices. (3) Users constitute mobile obstacles that block or shadow the channel between the transmitter and the receiver. First, we develop a mathematical framework for VLC link availability and a probabilistic model of the VLC network with respect to human behavior in indoor environments. Second, we design a realistic multiuser , indoor VLC system simulation with static and mobile VLC devices that are expected to be found in smart home environments. We present the following four sets of results: (1) We report statistics on the blockage durations of VLC links and categorize the links with respect to these statistics. (2) We demonstrate the performance of Selection Diversity versus Maximal Ratio Combining for mobile VLC devices carried by humans in a smart home setting. (3) We show that optimal LED resource allocation policies for multiple users are impacted by the VLC link blockage events caused by humans. (4) We demonstrate that the link blockage events in different rooms become dependent due to humans who transition between rooms. Based on our results, we provide new directions for the design of network architectures for indoor VLC systems.

show abstract

Non-line of sight visible light communications: A technical and application based survey

Merdan

Thiagarajah

Dambul

2022

Optik

View full text Add to dashboard Cite

Study on VLC Channel Modeling Under Random Shadowing

Cited by 32 publications

References 22 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

Characterization of Line-of-Sight Link Availability in Indoor Visible Light Communication Networks Based on the Behavior of Human Users

Non-line of sight visible light communications: A technical and application based survey

Contact Info

Product

Resources

About