This document provides an overview of visible light communication (VLC) technology. It begins with an abstract that introduces VLC as a green communication method using visible light. The document then outlines the history and development of VLC over time. It includes a basic block diagram of VLC technology and modulation. It discusses reasons for using VLC, such as it not being regulated like wireless and its ability to use image sensors as receivers. Examples are given of using VLC for 3D positioning systems and vehicle communication. Advantages like using ubiquitous LED lights and disadvantages are also summarized.
Light Fidelity (Li-Fi) is a bidirectional, high speed , fully networked wireless communication technology similar to Wi-Fi. Li-Fi was first put forward by Professor Harald Haas,University of Edinburgh, during a TED Talk in 2011. Li-Fi is a form of visible light communication and a subset of optical wireless communications (OWC) and could be a complement to RF communication (Wi-Fi or Cellular network), or even a replacement in contexts of data broadcasting. It is so far measured to be about 100 times faster than some Wi-Fi implementations, reaching speeds of 224 gigabits per second.
Light Fidelity (Li-Fi) is a bidirectional, high speed , fully networked wireless communication technology similar to Wi-Fi. Li-Fi was first put forward by Professor Harald Haas,University of Edinburgh, during a TED Talk in 2011. Li-Fi is a form of visible light communication and a subset of optical wireless communications (OWC) and could be a complement to RF communication (Wi-Fi or Cellular network), or even a replacement in contexts of data broadcasting. It is so far measured to be about 100 times faster than some Wi-Fi implementations, reaching speeds of 224 gigabits per second.
The following ppt gives overview about Optical Communication and the underlying principle with the general overview of all the contents for optical communication
In this technology, light is passed through transmission channel as it is the fastest medium. It overcomes the defect of WI-FI as well. Transmission of data takes place through illumination. Using this, we can connect to several devices under a single LED light.
Li fi technology paper presentation, Li- Fi, VLC, Visible light communication...Sirod Deo
The demand for wireless data is increasing at an exponential rate hence to cater the demand, various technology options are to be looked for and need to be implemented. An emerging technology using Visible Light Communication (VLC) for high speed wireless communications is Light Fidelity dubbed as Li-Fi. To provide high speed communication light is modulated without interfering the main purpose of lamp that is of illumination. LEDs are considered as a key component to be used in transmission because of its low cost and Omni-presence. Li-Fi can be thought of as a light-based Wi-Fi. That is, it uses light instead of radio waves to transmit information. And instead of Wi-Fi modems, Li-Fi would use transceiver-fitted LED lamps that can light a room as well as transmit and receive information.
Li-Fi is a new wireless technology which provides the connectivity within localized network environment. The main principle of this technology is we can transmit the data using light illumination by using light emitting diodes where radio frequency is media in Wi-Fi and LED bulb light intensity is faster than human eye can follow. One germen phycist-Prof Harald Haas an expert in optical wireless communications at the University of Edinburgh, he demonstrated how an LED bulb equipped with signal processing technology could stream a high-definition video to a computer. By using this technology a 1 watt LED light bulb would be enough to provide net connectivity to four computers. This technology termed as "light fidelity". This technology allows us to transfer data more securely with higher data rates. This technology is still under research and further exploitation could lead to wide applications.
The aim of this paper is to determine the viability of Indoor Optical Wireless Communication System. This paper introduces Visible Light Communication along with its merits, demerits and applications. Then the main characteristics of VLC system are described, around which the project is designed. Multiple Input-Multiple Output (MIMO) technique is used in the project in order to enhance the data rate of transmission. Instead of using a system of only one LED and one APD, which transmits only one bit at a time, a system of 4 LEDs and 4 APDs is introduced, which increases the data rates by 300% from the previous case. We observe the signal, noise, SNR, BER etc. across the room dimension. Finally, in the last chapter we summarize our results on the basis of MATLAB simulations and propose some modifications to this model that can be implemented in future.
These technology is new and it is very faster and more secure then then the WI-FI.And these technology will be used in some countries. It is in demonstrating stage.
The following ppt gives overview about Optical Communication and the underlying principle with the general overview of all the contents for optical communication
In this technology, light is passed through transmission channel as it is the fastest medium. It overcomes the defect of WI-FI as well. Transmission of data takes place through illumination. Using this, we can connect to several devices under a single LED light.
Li fi technology paper presentation, Li- Fi, VLC, Visible light communication...Sirod Deo
The demand for wireless data is increasing at an exponential rate hence to cater the demand, various technology options are to be looked for and need to be implemented. An emerging technology using Visible Light Communication (VLC) for high speed wireless communications is Light Fidelity dubbed as Li-Fi. To provide high speed communication light is modulated without interfering the main purpose of lamp that is of illumination. LEDs are considered as a key component to be used in transmission because of its low cost and Omni-presence. Li-Fi can be thought of as a light-based Wi-Fi. That is, it uses light instead of radio waves to transmit information. And instead of Wi-Fi modems, Li-Fi would use transceiver-fitted LED lamps that can light a room as well as transmit and receive information.
Li-Fi is a new wireless technology which provides the connectivity within localized network environment. The main principle of this technology is we can transmit the data using light illumination by using light emitting diodes where radio frequency is media in Wi-Fi and LED bulb light intensity is faster than human eye can follow. One germen phycist-Prof Harald Haas an expert in optical wireless communications at the University of Edinburgh, he demonstrated how an LED bulb equipped with signal processing technology could stream a high-definition video to a computer. By using this technology a 1 watt LED light bulb would be enough to provide net connectivity to four computers. This technology termed as "light fidelity". This technology allows us to transfer data more securely with higher data rates. This technology is still under research and further exploitation could lead to wide applications.
The aim of this paper is to determine the viability of Indoor Optical Wireless Communication System. This paper introduces Visible Light Communication along with its merits, demerits and applications. Then the main characteristics of VLC system are described, around which the project is designed. Multiple Input-Multiple Output (MIMO) technique is used in the project in order to enhance the data rate of transmission. Instead of using a system of only one LED and one APD, which transmits only one bit at a time, a system of 4 LEDs and 4 APDs is introduced, which increases the data rates by 300% from the previous case. We observe the signal, noise, SNR, BER etc. across the room dimension. Finally, in the last chapter we summarize our results on the basis of MATLAB simulations and propose some modifications to this model that can be implemented in future.
These technology is new and it is very faster and more secure then then the WI-FI.And these technology will be used in some countries. It is in demonstrating stage.
Development of an Audio Transmission System Through an Indoor Visible Light ...Mohammad Liton Hossain
This study presents an approach to develop an indoor visible light communication system capable of transmitting audio signal over light beam within a short distance. Visible Light Communication (VLC) is a pretty new technology which used light sources to transmit data for communication. In any communication system, both analog and digital signal transmission are possible, though, due to having the capability of providing a faithful quality of signal regeneration after the transmission process, digital communication system is much more popular than the analog one. In the current project, digital communication process was adopted also. To convert the analog audio signal into the digital transmission signal and vice versa, Pulse Width Modulation (PWM) was used as the signal encoding strategy. As the light emitter, white Light Emitting Diodes (LEDs) were used and as photo sensor, a solar cell was used instead of a photodiode to obtain greater signal power and sensitivity. In the system, the carrier signal for transmission was chosen to have a frequency of 50 KHz. At the receiving end, a 4th order Butterworth lowpass filter having a cutoff frequency of 8 KHz was used to demodulate the audio signal. Using only 2 white LEDs, the indoor transmission range of this visible light communication system was found to be 5 meters while reproducing a satisfactory quality audio.
Practical Fibre Optics and Interfacing Techniques to Industrial Ethernet and ...Living Online
This manual will provide you with the necessary background to understand the fundamentals of fibre optic systems and their individual components including fibres, cable construction, connectors, splices and optical sources and detectors. Various pitfalls associated with the implementation of fibre optic systems are discussed and workable solutions to these problems are provided. It will provide you with the knowledge to develop the required techniques for design, installation and maintenance of fibre optic systems.
MORE INFORMATION: http://www.idc-online.com/content/practical-fibre-optics-and-interfacing-techniques-industrial-ethernet-and-wireless-23?id=58
What is VLC
Visible light & Spectrum
VLC process
-Transmitter
-Receiver
-Modulation
VLC characteristics
Comparison with RF & IR
Demerits of VLC
Applications
Today’s majority of data technique uses Radio Spectrum. But the major drawback of data
technique using radio spectrum is that it is very congested and the demand for wireless data
double each year. Every one, it seems want to use wireless data but the capacity is drying up.
Light –Fidelity is the transmission of data through illumination .It comprises of sending data
through a Light Emitting Diode which varies in intensity faster than human eye can follow .It
uses the fact that light travels at a such a high speed which is faster than human eye to catch.
Therefore when we vary the intensity of light emitting source it become impossible for the
humans to catch that sensation. It leads to very high speed data transmission, which is for
superior to current technologies.
Practical Fibre Optics & Interfacing Techniques to Industrial Ethernet and Wi...Living Online
This manual will provide you with the necessary background to understand the fundamentals of fibre optic systems and their individual components including fibres, cable construction, connectors, splices and optical sources and detectors. Various pitfalls associated with the implementation of fibre optic systems are discussed and workable solutions to these problems are provided. It will provide you with the knowledge to develop the required techniques for design, installation and maintenance of fibre optic systems.
FOR MORE INFORMATION: http://www.idc-online.com/content/practical-fibre-optics-and-interfacing-techniques-industrial-ethernet-and-wireless-23?id=58
Practical fibre Optics for Engineers and TechniciansLiving Online
The Fieldbus and DeviceNet standards are also becoming a standard at the field and instrumentation level, and are replacing the traditional approaches in the plant today. Ethernet is fast becoming the obvious choice for industrial control networking worldwide.
While the basic structure of Ethernet has not changed much, the faster technologies such as fast Ethernet and gigabit Ethernet have increased the complexity and choices you have available in planning and designing these systems. There has also been a convergence between Fieldbus and DeviceNet standards in that they are also increasingly becoming based on industrial Ethernet for the higher speed data transfer applications.
There is a fair degree of confusion about where Fieldbus, DeviceNet and Ethernet, are applied and the workshop commences with a clear comparison between the different standards and where they are applied. The first day focuses on AsiBus, DeviceNet, Profibus and Foundation Fieldbus technologies in a simple and understandable manner.
Practical Fibre Optics for Engineers and TechniciansLiving Online
This is a comprehensive manual that provides the necessary background to understand the fundamentals of fibre optic systems and their individual components including: o fibres o cable construction o connectors o splices o optical sources and detectors. You will be able to use this knowledge to develop the required techniques for design, installation and maintenance of fibre optic systems.
MORE INFORMATION: http://www.idc-online.com/content/fibre-optics-engineers-technicians-22?country=Australia
2. OUTLINE
• Abstract
• Introduction
• Motivation
• VLC History
• Block diagram
• Reasons for using this communication
• Communication using Image Sensors
• Example of three dimensional position measuring sys..
• Future projects in wireless broadband
• Advantages & disadvantages
• Conclusions
3. ABSTRACT
• The wireless data transmission and wired data transmission has
been outdated. People always want to renovate stuffs. This
curiosity has led to visible light communication system. This
technique of data transmission has proved that the electronic lights
can not only be used for decorative purpose but also for
communication purpose. This technique has made use of the
harmless visible radiation around us for data transmission. Thus
we can’t ignore this method spelling that it’s not a green way, this
is a green way of communication which won’t affect humans and
other birds and animals in the environment. Hope the colorful
lights have given us a colorful way of data transmission. Now let’s
get some more information about this colorful method of data
transmission.
6. ~ 800 B.C.
405 B.C. 280 B.C. 1800s 1880 1900s Current
Photophone
Sunlight
Sunlight Heliograph
By Bell
Fire Beacon Pharos Burning Kite
Fire
Fire Lighthouse In Battle
Ship-to-ship Traffic Light
Lamp
Lamp Comm. /Signboard Light
LED
LED VLC
VLC
8. REASONS FOR USING THIS COMMUNICATION
• The visible light regulation is not regulated.
• Visible light LED will be used everywhere.
• Image sensors can be used as receivers
9. COMMUNICATION USING IMAGE
SENSORS
• Even if multiple visible light
sources send data simultaneously,
an image sensor is able to receive
and demodulate all the data
simultaneously without any
interference between them.
Camera receiver) continuously
takes images of a scene with an
LED light and a receiver detects
the optical intensity at a pixel
where the LED light is focused
on.
10. EXAMPLE OF THREE DIMENSIONAL POSITION
MEASURING SYSTEM
• The technology is applied to
measure the displacement which
is caused by the increase of
temperature of the aluminum
dome roof due to the sunshine in
the daytime. 12 LED lightings
were attached to the roof. We
were able to do automatic
measurement of every 20 minutes
for 24 hours and confirm the
displacement of several
millimeters
11. EXAMPLE OF THREE DIMENSIONAL POSITION
MEASURING SYSTEM
• Consider a parallel visible
light communication system
using an LED array as a
transmitter and high-speed
camera on a vehicle as a
receiver
14. REFERENCE
•Afgani, M., Haas, H., Elgala, H., and Knipp, D. 2006. Visible light
communication usingOFDM. In 2nd International Conference on Testbeds
and Research Infrastructures for theDevelopment of Networks and
Communities, 2006. TRIDENTCOM 2006
.
•Amirshahi, P. and Kavehrad, M. 2006. Broadband access over medium and
low voltage power-lines and use of white light emitting diodes for indoor
communications. In IEEE ConsumerCommunications & Networking
Conference, Las Vegas, Nevada.
•Citeseer.Crown, A. 1974. Tidings and Instructions: How News Travelled in
the Ancient Near East. Journalof the Economic and Social History of the
Orient/Journal de l'histoireeconomiqueetsocialede l'Orient 17, 3, 244{271.