A Comprehensive Lighting Configuration for Efficient Indoor Visible Light Communication Networks

Design of an efficient indoor visible light communication (VLC) system requires careful considerations on both illumination and communication aspects. Besides fundamental factors such as received power and signal-to-noise ratio (SNR) level, studies on mobility scenarios and link switching process must be done in order to achieve good communication link quality in such systems. In this paper, a comprehensive lighting configuration for efficient indoor VLC systems for supporting mobility and link switching with constraint on illumination, received power, and SNR is proposed. Full connectivity in mobility scenarios is required to make the system more practical. However, different from other literatures, our work highlights the significance of recognizing the main influences of field of view angle on the connectivity performance in the practical indoor scenarios. A flexible link switching initiation algorithm based on the consideration of relative received power with adaptive hysteresis margin is demonstrated. In this regard, we investigate the effect of the overlap area between two light sources with respect to the point view of the receiver on the link switching performance. The simulation results show that an indoor VLC system with sufficient illumination level and high communication link quality as well as full mobility and support link switching can be achieved using our approach.

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Analysis of Visible Light Communication Link’s Performance in Fire Smoke Environment

Complexity ◽

10.1155/2021/1481969 ◽

2021 ◽

Vol 2021 ◽

pp. 1-7

Author(s):

Yu-Feng Yang ◽

Kang-Kang Chang ◽

Ying Ci

Keyword(s):

Visible Light ◽

Signal To Noise Ratio ◽

Visible Light Communication ◽

Communication Link ◽

Maximum Difference ◽

Background Light ◽

Opposite Trend ◽

Received Power ◽

Fire Smoke ◽

In Fire

This paper mainly studies the communication performance of visible light communication link in fire smoke environment. Compared with the previous studies, this study no longer only considers a single wavelength and considers the influence of smoke and background light noise. Firstly, the variation of background light noise caused by sunlight during a day was analyzed, then signal-to-noise ratio (SNR) and bit error rate (BER) of the visible light communication link in fire smoke environment with different visibility were calculated, and finally, the variation of received power with the angle β between the LED optical axis and the communication link (from LED to receiver) was analyzed. The results show that, during a day from 07:00 to 18:30, background light noise first increases and then decreases, BER changes in the same trend and reaches the maximum at about 13:00, while SNR changes in the opposite trend and reaches the minimum at about 13:00. When visibility is 100 m, the maximum difference of SNR between 7:00 and 13:00 is about 19 dB, and the maximum difference of BER is about 5.3E-10. At 7:00, the maximum difference of SNR is about 13 dB between the visibility of 1 m and the visibility of 100 m, and the maximum difference of BER is about 1.44E − 11, and received power decreases with the increase of β. In addition, SNR increases with visibility of fire smoke environment, and BER changes in the opposite trend. Lastly, in order to enhance the performance of visible light communication in fire smoke environment, this paper gives the transmitting power scheme.

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Performance evaluation of optical attocells configuration in an indoor visible light communication

Indonesian Journal of Electrical Engineering and Computer Science ◽

10.11591/ijeecs.v14.i2.pp668-676 ◽

2019 ◽

Vol 14 (2) ◽

pp. 668 ◽

Cited By ~ 2

Author(s):

M.S. M. Gismalla ◽

M.F. L. Abdullah

Keyword(s):

Visible Light ◽

Power Distribution ◽

Signal To Noise Ratio ◽

Low Cost ◽

Data Communication ◽

Visible Light Communication ◽

Base Stations ◽

Configuration Model ◽

Received Power ◽

Small Base

Visible light communication VLC is deemed as futuristic technology applied for both illumination and data communication due to the low-cost energy consumption, long life expectancy, huge bandwidth, and high security compared to radio frequency RF. Uncovered area, minimum signal-to-noise ratio (SNR) and received power results from the non-uniform distribution of small base stations (i.e. Optical attocells) in the room. In this paper, the researchers propose a new LEDs distribution of five optical attocells configuration model in order to optimize the received power distribution and SNR at the center of the room for indoor VLC system. The optical attocells configuration in terms of received power to fill the uncovered area at the center of the room has been investigated. The simulation results showed that the proposed attocells configuration saved 24.9% of the transmitted power. Besides that, the whole room was covered uniformly. As a result, the received power and SNR are improved.

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Recent Advances in Indoor Localization via Visible Lights: A Survey

Sensors ◽

10.3390/s20051382 ◽

2020 ◽

Vol 20 (5) ◽

pp. 1382 ◽

Cited By ~ 5

Author(s):

A B M Mohaimenur Rahman ◽

Ting Li ◽

Yu Wang

Keyword(s):

Visible Light ◽

Indoor Localization ◽

Low Cost ◽

Visible Light Communication ◽

Light Sources ◽

Smart Building ◽

Recent Advances ◽

Radio Signals ◽

Indoor Scenarios ◽

Indoor Spaces

Because of the limitations of the Global Positioning System (GPS) in indoor scenarios, various types of indoor positioning or localization technologies have been proposed and deployed. Wireless radio signals have been widely used for both communication and localization purposes due to their popular availability in indoor spaces. However, the accuracy of indoor localization based purely on radio signals is still not perfect. Recently, visible light communication (VLC) has made use of electromagnetic radiation from light sources for transmitting data. The potential for deploying visible light communication for indoor localization has been investigated in recent years. Visible-light-based localization enjoys low deployment cost, high throughput, and high security. In this article, the most recent advances in visible-light-based indoor localization systems have been reviewed. We strongly believe that visible-light-based localization will become a low-cost and feasible complementary solution for indoor localization and other smart building applications.

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MAC/PHY Comprehensive Visible Light Communication Networks Simulation

Sensors ◽

10.3390/s20216014 ◽

2020 ◽

Vol 20 (21) ◽

pp. 6014

Author(s):

Edmundo Torres-Zapata ◽

Victor Guerra ◽

Jose Rabadan ◽

Martin Luna-Rivera ◽

Rafael Perez-Jimenez

Keyword(s):

Visible Light ◽

Communication Networks ◽

Light Propagation ◽

Optical Network ◽

Physical Nature ◽

Visible Light Communication ◽

Propagation Model ◽

System Level ◽

Visible Light Communications ◽

Indoor Scenarios

In this paper, the effect of channel conditions on the global behavior of a wireless Visible Light Communications (VLC) optical network are studied. It presents a system-level simulator that considers jointly a channel propagation model and the MAC mechanisms to have a realistic description of the network, even in situations where the emitted signal is heavily affected by reflections in any close surface or obstacle. The resulting platform also accurately evaluates both Line-Of-Sight (LOS) and Non-LOS (NLOS) contributions on each node and enables the effective use of Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) schemes as defined by IEEE 802.15.7r1 standard, as well as allows a correct evaluation of lifelike problems such as the effect of hidden nodes. This work shows the necessity of accurately modeling VLC MAC layer performances, taking also into account the physical nature of visible light propagation in indoor scenarios.

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A Visible Light Communication Channel Model for Agronomic Environments

10.21203/rs.3.rs-186092/v1 ◽

2021 ◽

Author(s):

Hugo Sanchez Quispe ◽

Pablo Palacios Játiva ◽

Freddy Ajila Zaquinaula ◽

Santiago Logroño Naranjo ◽

Hilter Figueroa Saavedra ◽

...

Keyword(s):

Visible Light ◽

Channel Model ◽

Signal To Noise Ratio ◽

Visible Light Communication ◽

Analytical Framework ◽

Traditional Agriculture ◽

Indoor Environments ◽

Light Spectrum ◽

Efficient Operation ◽

Received Power

Abstract Currently, agriculture based on agronomic greenhouses is replacing traditional agriculture. This technique reduces dependence on rain on crops. It also generates a controlled internal environment making optimal use of land and water resources. However, this environment needs more care and attention compared to traditional agriculture. To overcome this limitation, various radio frequency (RF)-based technologies can be used. Nevertheless, studies show that the use of communications in RF bands degrades crops' growth and quality. Therefore, an efficient solution is to use the visible light spectrum for communication, the main technology of which is called visible light communication (VLC). Despite numerous studies for the application of VLC in indoor environments, specific VLC systems for agronomic greenhouse environments or their channel models are not yet investigated in depth. To collaborate on state of art on this topic, we present in this paper a novel channel model that incorporates specific factors that affect the quality of VLC systems in agronomic greenhouse environments. Factors such as the random position and orientation of the transmitters and external environmental agents such as atmospheric and different noise types are considered. These components are integrated into an analytical framework by developing the mathematical model of the VLC channel. Furthermore, the analytical expressions of the received power, the signal-to-noise-ratio (SNR), and the bit error rate (BER) are obtained. A VLC system applied to an agronomic greenhouse scenario is developed through computer simulations to validate the mathematical analysis. The results show that illuminance is adequate for the efficient operation of the greenhouse. Besides, the influence of atmospheric factors and noises on the magnitude and temporal dispersion of the channel impulse response is verified. Finally, the results show the system's performance in terms of SNR and BER, observing their differences compared to a traditional indoor VLC system.

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