W
hether you’re using wireless internet in a coffee shop,stealing it from the guy next door, or competing for bandwidth at a conference, you have probably gotten frustrated at the slow speeds you face when more than one device is tapped into the network. As more and more people and their manydevices access wireless internet, clogged airwaves are going tomake it.
One German physicist, Harald Haas has come up with asolution he calls “data through illumination” –taking the fibberout of fiber optic by sending data through an LED light bulbthat varies in intensity faster than the human eye can follow.It’s the same idea band behind infrared remote controls but farmore powerful.
Haas says his invention, which he calls D-Light,can produce data rates faster than 10 megabits persecond, which is speedier than your average broadbandconnection. He envisions a future where data for laptops,smart phones, and tablets is transmitted through the light in aroom. And security would be snap – if you can’t see the light,you can’t access the data.
Li-Fi is typically implemented using white LED light bulbs at the downlink transmitter. These devices are normally used for illumination only by applying a constant current. However, by fast and subtle variations of the current, the optical output can be made to vary at extremely high speeds. This very property of optical current is used in Li-Fi setup.The operational procedure is very simple-,data from the internet and local network is used to modulate the intensity of the LED light source if any undetectable to the human eye. The photo detector picks up signal, which is converted back into a data stream and sent to the client.
The client can communicate through its own LED output or over the existing network. An overhead lamp fitted with an LED with signal-processing technology streams data embedded in its beam at ultra-high speeds to the photo-detector. A receiver dongle then converts the tiny changes in amplitude into an electrical signal, which is then converted back into a data stream and transmitted to a computer or mobile device.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
W
hether you’re using wireless internet in a coffee shop,stealing it from the guy next door, or competing for bandwidth at a conference, you have probably gotten frustrated at the slow speeds you face when more than one device is tapped into the network. As more and more people and their manydevices access wireless internet, clogged airwaves are going tomake it.
One German physicist, Harald Haas has come up with asolution he calls “data through illumination” –taking the fibberout of fiber optic by sending data through an LED light bulbthat varies in intensity faster than the human eye can follow.It’s the same idea band behind infrared remote controls but farmore powerful.
Haas says his invention, which he calls D-Light,can produce data rates faster than 10 megabits persecond, which is speedier than your average broadbandconnection. He envisions a future where data for laptops,smart phones, and tablets is transmitted through the light in aroom. And security would be snap – if you can’t see the light,you can’t access the data.
Li-Fi is typically implemented using white LED light bulbs at the downlink transmitter. These devices are normally used for illumination only by applying a constant current. However, by fast and subtle variations of the current, the optical output can be made to vary at extremely high speeds. This very property of optical current is used in Li-Fi setup.The operational procedure is very simple-,data from the internet and local network is used to modulate the intensity of the LED light source if any undetectable to the human eye. The photo detector picks up signal, which is converted back into a data stream and sent to the client.
The client can communicate through its own LED output or over the existing network. An overhead lamp fitted with an LED with signal-processing technology streams data embedded in its beam at ultra-high speeds to the photo-detector. A receiver dongle then converts the tiny changes in amplitude into an electrical signal, which is then converted back into a data stream and transmitted to a computer or mobile device.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Lifi(Light fidelity)-Efficient use of visible spectruminventionjournals
ABSTRACT : LEDs are beginning to be used in every home and office which makes LED’s light ideal for ubiquitous data transmitter This means that everywhere where LEDs are used, lighting bulbs can bring not only the light but wireless connection at the same time. With increasing demand for wireless data, lack of radio spectrum and issues with hazardous electromagnetic pollution, LiFi is a new wireless communication technology which enables a wireless data transmission through LED light. LiFi appears as a new greener, healthier and cheaper alternative to WiFi. Li-Fi is the emerging area of technology is also known as Visible Light Commu-nications (VLC) .Moreover LiFi makes possible to have a wireless Internet in specific environments (hospitals, airplanes etc.) where WiFi is not allowed due to interferences or security considerations.
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 ,this latest Technology LI-FI describes transmission of “data through illumination” taking the fiber out of fiber optic by sending data through an LED light bulb that varies in intensity faster than the human eye can follow.
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.
With the vast growing gadgets, their usage and their developments led to the advancement in the Wi-Fi which provides a technology so called Li-Fi.Li-Fi is a technology that makes use of LED light which helps in the transmission of data much more faster and flexible than data that can be transmitted through Wi-Fi.Light reaches nearly everywhere so communication can also go along with light freely. Light Fidelity is a branch of optical wireless communication which is an emerging technology. By using visible light as transmission medium, Li-Fi provides wireless indoor communication. The bit rate achieved by Li-Fi cannot be achieved by Wi-Fi.. Dr herald Haas ,the professor of mobile communications at the university of Edinburgh school of engineering ,first time publically displayed the proof of Light Fidelity(Li-Fi) ,a method of Visible Light communication(VLC). Li-Fi is the transfer of data through light by taking fiber out of fiber optics and sending data through LED light.
At the heart of this technology, a new generation of high-brightness light-emitting diodes. Very simply, if the LED is ON, user can transmit a digital string of 1, if it’s OFF then user can transmit a string of 0. It can be switched ON and OFF very quickly, which gives instant opportunity for transmitting data. It is possible to encode data in the light by varying the rate at which the LEDs flicker ON and OFF to pass different strings of 1s and 0s. The modulation is so fast that the human eye doesn’t notice. There are over 14 billion light bulbs used across the world, which needs to be replaced with LEDs ones that transmit data.
This is the latest technolgy which encourages viewers. Also this technolgy is vast because researchers are still researching about this technolgy so that this technolgy can be used practically all over the world.
The slides illustrate and visualize the design of a simple LIFI application-underwater communication. Using some pre-programmed module with the aim of understanding the concept of VLC visible light communication.
Read full preprint: https://www.researchgate.net/publication/348294258_Conceptual_Design_of_LiFi_Audio_Transmission_Using_Pre-Programmed_Modules
Lifi(Light fidelity)-Efficient use of visible spectruminventionjournals
ABSTRACT : LEDs are beginning to be used in every home and office which makes LED’s light ideal for ubiquitous data transmitter This means that everywhere where LEDs are used, lighting bulbs can bring not only the light but wireless connection at the same time. With increasing demand for wireless data, lack of radio spectrum and issues with hazardous electromagnetic pollution, LiFi is a new wireless communication technology which enables a wireless data transmission through LED light. LiFi appears as a new greener, healthier and cheaper alternative to WiFi. Li-Fi is the emerging area of technology is also known as Visible Light Commu-nications (VLC) .Moreover LiFi makes possible to have a wireless Internet in specific environments (hospitals, airplanes etc.) where WiFi is not allowed due to interferences or security considerations.
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 ,this latest Technology LI-FI describes transmission of “data through illumination” taking the fiber out of fiber optic by sending data through an LED light bulb that varies in intensity faster than the human eye can follow.
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.
With the vast growing gadgets, their usage and their developments led to the advancement in the Wi-Fi which provides a technology so called Li-Fi.Li-Fi is a technology that makes use of LED light which helps in the transmission of data much more faster and flexible than data that can be transmitted through Wi-Fi.Light reaches nearly everywhere so communication can also go along with light freely. Light Fidelity is a branch of optical wireless communication which is an emerging technology. By using visible light as transmission medium, Li-Fi provides wireless indoor communication. The bit rate achieved by Li-Fi cannot be achieved by Wi-Fi.. Dr herald Haas ,the professor of mobile communications at the university of Edinburgh school of engineering ,first time publically displayed the proof of Light Fidelity(Li-Fi) ,a method of Visible Light communication(VLC). Li-Fi is the transfer of data through light by taking fiber out of fiber optics and sending data through LED light.
At the heart of this technology, a new generation of high-brightness light-emitting diodes. Very simply, if the LED is ON, user can transmit a digital string of 1, if it’s OFF then user can transmit a string of 0. It can be switched ON and OFF very quickly, which gives instant opportunity for transmitting data. It is possible to encode data in the light by varying the rate at which the LEDs flicker ON and OFF to pass different strings of 1s and 0s. The modulation is so fast that the human eye doesn’t notice. There are over 14 billion light bulbs used across the world, which needs to be replaced with LEDs ones that transmit data.
This is the latest technolgy which encourages viewers. Also this technolgy is vast because researchers are still researching about this technolgy so that this technolgy can be used practically all over the world.
The slides illustrate and visualize the design of a simple LIFI application-underwater communication. Using some pre-programmed module with the aim of understanding the concept of VLC visible light communication.
Read full preprint: https://www.researchgate.net/publication/348294258_Conceptual_Design_of_LiFi_Audio_Transmission_Using_Pre-Programmed_Modules
Li fi(led transmission of data) presentationKakashi57
LIFI –”LIGHT FIDEALITY” is transmission of data through illumination, i.e. sending data through a LED light bulb that varies in intensity faster than human eye can follow. Li-Fi is a light based Wi-Fi it uses light instead of radio waves to transmit information.
HISTORY - The technology truly began during the year 1990’s in countries like Germany , Korea and Japan where they discovered LED’s could be retrofitted to send information . Prof. Harald Hass from university of Edinburgh. continues to wow the world with the potential to use light for communication He demonstrated in year 2012.
5. IMPLEMENTATION OF LI-FI The LI-FI product consists of three primary sub assemblies A. Emitter B. RF Driver C. Power Supply
6. FUNCTION OF BULB ASSEMBLY - At the heart of LI-FI is the bulb sub assembly where a sealed bulb is embedded in a dielectric material The dielectric material serves two purposes A. Wave guide B. Electric field
7. RF DRIVER - Power amplifier (PA) assembly that uses an LDMOS device. Converts electrical energy into RF power. The PA is designed to ruggedness and efficiency. The RF driver also contains controls circuit for digital and analog lighting controls.
8. HOW LI-FI WORKS- Operational procedure is very simple, if the LED is on, you transmit a digit 1, if its off you transmit a digit 0. the LED’s can be switched on and off quickly, which gives nice opportunities for transmitting data. hence all that us required is some LEDS and a controller that code data into those LEDs. We have to just vary the rate at which the LEDs flicker depending upon the data we want to encode. Thus every light source will work as a hub for data transmission. IMPLEMENTATION OF LI-FI The LI-FI product consists of three primary sub assemblies A. Emitter B. RF Driver C. Power Supply
6. FUNCTION OF BULB ASSEMBLY - At the heart of LI-FI is the bulb sub assembly where a sealed bulb is embedded in a dielectric material The dielectric material serves two purposes A. Wave guide B. Electric field
7. RF DRIVER - Power amplifier (PA) assembly that uses an LDMOS device. Converts electrical energy into RF power. The PA is designed to ruggedness and efficiency. The RF driver also contains controls circuit for digital and analog lighting controls.
8. HOW LI-FI WORKS- Operational procedure is very simple, if the LED is on, you transmit a digit 1, if its off you transmit a digit 0. the LED’s can be switched on and off quickly, which gives nice opportunities for transmitting data. hence all that us required is some LEDS and a controller that code data into those LEDs. We have to just vary the rate at which the LEDs flicker depending upon the data we want to encode. Thus every light source will work as a hub for data transmission
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. Since simple light bulbs are used, there can technically be any number of access points.
Whether you’re using wireless internet in a coffee shop, stealing it from the guy next door, or competing for
bandwidth at a conference, you’ve probably gotten frustrated at the slow speeds you face when more than one device is
tapped into the network. As more and more people and their many devices access wireless internet, clogged airwaves
are going to make it increasingly difficult to latch onto a reliable signal. But radio waves are just one part of the
spectrum that can carry our data. What if we could use other waves to surf the internet? One German physicist,DR.
Harald Haas, has come up with a solution he calls “Data Through Illumination”—taking the fiber out of fiber optics by
sending data through an LED light bulb that varies in intensity faster than the human eye can follow. It’s the same idea
behind infrared remote controls, but far more powerful. Haas says his invention, which he calls D-Light, can produce
data rates faster than 10 megabits per second, which is speedier than your average broadband connection. He envisions a
future where data for laptops, smartphones, and tablets is transmitted through the light in a room. And security would be
a snap—if you can’t see the light, you can’t access the data. Li-Fi is a VLC, visible light communication, technology
developed by a team of scientists
INTRODUCTION
HISTORY
PRESENT SCENARIO
ISSUES REGARDING RADIO SPECTRUM
VISIBLE LIGHT SPECTRUM
HOW LIFI WORKS
CONSTRUCTION OF LIFI
COMPARISON OF LIFI WITH WIFI
APPLICATIONS
LIMITATIONS
CONCLUSION
REFERENCES
0x01 - Newton's Third Law: Static vs. Dynamic AbusersOWASP Beja
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About the Speaker
===============
Diogo Sousa, Engineering Manager @ Canonical
An opinionated individual with an interest in cryptography and its intersection with secure software development.
Sharpen existing tools or get a new toolbox? Contemporary cluster initiatives...Orkestra
UIIN Conference, Madrid, 27-29 May 2024
James Wilson, Orkestra and Deusto Business School
Emily Wise, Lund University
Madeline Smith, The Glasgow School of Art
Acorn Recovery: Restore IT infra within minutesIP ServerOne
Introducing Acorn Recovery as a Service, a simple, fast, and secure managed disaster recovery (DRaaS) by IP ServerOne. A DR solution that helps restore your IT infra within minutes.
Have you ever wondered how search works while visiting an e-commerce site, internal website, or searching through other types of online resources? Look no further than this informative session on the ways that taxonomies help end-users navigate the internet! Hear from taxonomists and other information professionals who have first-hand experience creating and working with taxonomies that aid in navigation, search, and discovery across a range of disciplines.
This presentation by Morris Kleiner (University of Minnesota), was made during the discussion “Competition and Regulation in Professions and Occupations” held at the Working Party No. 2 on Competition and Regulation on 10 June 2024. More papers and presentations on the topic can be found out at oe.cd/crps.
This presentation was uploaded with the author’s consent.
Competition and Regulation in Professional Services – KLEINER – June 2024 OEC...
Li fi project presentation
1. SEMINAR ON
LI-FI
Presented By -
Ayush Varshney
1611030018
Btech 4th Year
Electronics Engineering
IERT EDD, Prayagraj
Presented To -
Mr. Nurmesh Bhartiya
Assistant Professor
IERT EDD
2. Contents
Introduction
What is LiFi ?
Why is it requied ?
How LiFi Works
LiFi Construction
Li-Fi Vs Wi-Fi
Applications of LiFi
Advantages
Limitations or Challenges
Conclusion
Refrences
4. Introduction
The technology truly began
during the 1990's in
countries like Germany,
Korea, and Japan where
they discovered LED's
could be retrofitted to send
information. Harald
Haas continues to wow the
world with the potential to
use light for
communication
HARALD
HASS
5. On 12th July 2011. He used a table lamp with an LED
bulb to transmit a video of blooming flowers that was
then projected onto a screen behind him. During the
event he periodically blocked the light from lamp to
prove that the lamp was indeed the source of incoming
data.
At TEDGlobal, Harald Haas demonstrated a data rate
of transmission of around 10Mbps -- comparable to a
fairly good UK broadband connection. Two months later
he achieved 123Mbps.
Back in 2011 German scientists succeeded in creating
an800Mbps (Megabits per second) capable wireless
network
6. WHAT IS LI –
FI ?LIGHT FIDEALITY
• LI-FI is transmission of data through
illumination ,ie sending data through a
LED light bulb that varies in intensity
faster than human eye can follow.
• Li-Fi is bidirectional , high speed and
fully networked wireless communications
similar to Wifi, Li-Fi is a subset of optical
wireless communication (OWC) and can
be a complement to RF communication
(WiFi or Cellular network ), or a
replacement in contexts of data
broadcasting .
7.
8. WHY IT IS REQUIRED?
1.4 Million 5 Billion
• Radio Spectrum is congested but the
demand for wireless data double each year
.Everything, it seems want to use wireless
data but the capacity is drying up.
9.
10.
11.
12. Radi
o
Wave
s
Infrare
d
Rays
Visibl
e
Rays
Ultraviole
t
Rays
X-
Rays
Gam
a
Ray
s
Gama rays can’t be used as they could be
dangerous.
X-rays have similar health issues.
Ultraviolet light is good for place without
people, but other wise dangerous for the
human body.
Infrared, due to eye safety regulation, can only
be used with low power.
Hence we left with the only the only the Visible-
Light Spectrum.
13. LED i.e., Light emitting diode can be switched on
and off faster since operating speed of LED is less
than 1 μs, than the human eye can detect, causing
the light source to be appear continuously. This
invisible on-off activity enables a kind of data
transmission using binary codes. Switching on and
LED is a logical ‘1’, switching it off is a logical ‘0’.It
is possible to encode data in the light by varying the
rate at which LED’s flicker on and off to give
different strings of 1s and 0s. Modulation is so fast
that human eye doPagee 1s4 n’t notice
Basic concepts
14. How LI-FI
Works
?
Operational procedure is very simple, if the led is on,
you transmit a digital 1, if its off you transmit a 0.
The LEDs can be switched on and off very quickly,
which gives nice opportunities for transmitting data.
Hence all that us required is some LEDS and a
controller that code data into those LEDs. Wehave to
just vary the rate at which theLED’s flicker depending
upon the data we want to encode
Thus every light source
will works as a hub for
data transmission
15.
16. Further enhancements can be made in
this method, like using an array of LEDs
for parallel data transmission, or using
mixtures of
red, green and blue LEDs to alter the
light‘s frequency with each frequency
encoding a different data channel.
Such advancements promise a
theoretical speed of 10 Gbps –
17.
18. LI FI CONSTRUCTION
The LI FI product consists of 4 primary sub-assemblies:
• Bulb
• RF power amplifier circuit (PA)
• Printed circuit board (PCB)
• Enclosure
3-The PCB controls the electrical inputs and outputs of the lamp and
houses the microcontroller used to manage different lamp functions.
2- An RF (radio-frequency) signal is generated by the solid-state PAand
is guided into an electric field about the bulb. The high concentration of
energy in the electric field vaporizes the contents of the bulb to a plasma
state at the bulb’s center; this controlled pasma generates an intense
source of light. All of these subassemblies are contained in analuminum
enclosure.
19. LiFi Vs Wi-Fi
• 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
20.
21. POTENTIAL
APPLICATION OF
LI-FI
Li Fi technology is still in its infancy .However some
areas where it seems perfectly applicable are:-
1 TRAFFIC LIGHTS
Traffic lights can communicate to the car
and with each other. Cars have LED-
based
headlights, LED-based cack lights, and
cars can communicate with each other
and prevent accidents in by exchanging
information.
24. 3- Airlines
Whenever we travel through airways we face the problem in
communication media ,because the whole airways
communication are performed on the basis of radio waves. To
overcomes this drawback on radioways , li-fi is introduced.
25. There are millions of street lamps deployed
around the world.
Each of these street lamps could be a free
access point.
PUBLIC INTERNET
HOTSPOTS
26. ADVANTAGES OF LI-FI
Li-Fi can solve problems related to the insufficiency of
radio frequency bandwidth because this technology
uses Visible Light spectrum that has still not been
greatly utilized.
High data transmission rates of up to 10 Gbps can be
achieved.
Since light cannot penetrate walls, it provides privacy
and security that Wi-Fi cannot.
Li-Fi has low implementation and maintenance osts.
27. Limitations or
challenges
-# Light can't pass through objects
#. Interferences from external light sources
like sun light, normal bulbs, and opaque
materials in the path of transmission will
cause interruption in the communication.
#High installation cost of the VLC systems
#A major challenge facing Li-Fi is how the
receiving device will transmit back to
transmitter.
28. CONCLUSI
ON
The possibilities are numerous and
can be explored further. If this
technology can be put into practical
use , every bulb can be used
something like a Wi-Fi hotspots to
transmit wireless data.