Light Fidelity (Li-Fi) is a bidirectional, high-speed and fully networked wireless communication technology similar to Wi-Fi. The term was coined by Harald Haas[1] and 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 networks), or even a replacement in contexts of data broadcasting.
Li-Fi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission.Li-Fi is designed to use LED light bulbs similar to those currently in use in many energy-conscious homes and offices.
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.
Light Fidelity (Li-Fi) is a bidirectional, high-speed and fully networked wireless communication technology similar to Wi-Fi. The term was coined by Harald Haas[1] and 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 networks), or even a replacement in contexts of data broadcasting.
Li-Fi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission.Li-Fi is designed to use LED light bulbs similar to those currently in use in many energy-conscious homes and offices.
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.
In simple terms, 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.
This technology uses a part of the electromagnetic spectrum that is still not greatly utilized- The Visible Spectrum. Light is in fact very much part of our lives for millions and millions of years and does not have any major ill effect. Moreover there is 10,000 times more space available in this spectrum and just counting on the bulbs in use, it also multiplies to 10,000 times more availability as an infrastructure, globally.
In simple terms, 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.
This technology uses a part of the electromagnetic spectrum that is still not greatly utilized- The Visible Spectrum. Light is in fact very much part of our lives for millions and millions of years and does not have any major ill effect. Moreover there is 10,000 times more space available in this spectrum and just counting on the bulbs in use, it also multiplies to 10,000 times more availability as an infrastructure, globally.
A presention on LIFI technology..
Use MS Office 13 to view the original fonts and pics used within(as they are not supported in the previous versions..)
The Best Collected PPT to give presentation on Li-Fi Technology .I've referenced from many of the PPT's Available and made this.Hope so you would like this
You can get the basic theme of an emerging communication technology named "LiFi" which will overcome the drawbacks of WiFi by a good margin!
(For watching the GIF's use Slideshow)
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.
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.
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https://alandix.com/academic/papers/synergy2024-epistemic/
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Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
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4. Demo
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Execution from the test manager
Orchestrator execution result
Defect reporting
SAP heatmap example with demo
Speaker:
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
UiPath Test Automation using UiPath Test Suite series, part 4
Lifi technology ppt
1.
2. GENESIS OF LIFI
The idea of Li-Fi was introduced by a German physicist, Harald Haas.
The term Li-Fi was first used by Haas in his TED Global talk on Visible
Light Communication.
According to Hass, the light, which he referred to as D-Light,
can be used to produce data rates higher than 10 megabits
per second which is much faster than
our average broadband connection.
3. WHY LI-FI?
The current wireless networks that connect us to the internet are very
slow when multiple devices are connected.
As the number of devices that access the internet increases, the fixed
bandwidth available makes it more and more difficult to enjoy high data
transfer rates and connect to a secure network.
Radio waves are just a small part of the spectrum available for data
transfer.
A solution to this problem is by the use of “LI-FI”
4. WHAT IS LI-FI?
Li-Fi is transmission of data through illumination .
Data is sent through an LED light bulb that varies in
intensity faster than the human eye can follow.
Li-Fi uses visible light instead of Gigahertz radio waves for
data transfer.
It is the optical version of Wi-Fi.
5. CONSTRUCTION OF LI-FI
The Li-fi emitter system consists of 4 primary
subassemblies
a) Bulb
b) RF power amplifier circuit (PA)
c) Printed circuit board (PCB)
d) Enclosure
6. CONSTRUCTION OF LI-FI
The PCB controls the electrical
inputs and outputs of the lamp.
A RF signal is generated by the
solid-state PA and 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;
All of these subassemblies are
contained in an aluminum
enclosure
7. CONSTRUCTION OF LI-FI
The bulb sub-assembly is the
heart of the Li-Fi emitter
. It consists of a sealed bulb
which is embedded in a
dielectric material.
The dielectric material acts as a
waveguide for the RF energy
transmitted by the PA and also
as an electric field concentrator .
The energy from the electric
field rapidly heats the material in
the bulb to a plasma state that
emits light of high intensity and
full spectrum.
8. WORKING OF LI-FI
There is a light emitter on one
end, for example, an LED, and a
light sensor on the other.
The photo detector registers a
binary one when the LED is on;
and a binary zero if the LED is
off.
To build up a message, flash the
LED numerous times or to
obtain data rates in the range of
100’s of megabits per second.
The data can be encoded in the
light by varying the flickering
rate at which the LEDs flicker on
and off.
9. WORKING OF LI-FI
LEDs can be switched on and
off faster causing the light
source to appear to be on
continuously though it
'flickering'.
The on-off activity of the bulb
enables data transmission using
binary codes.
. By varying the rate of flickering
of LEDs information can be
encoded in the light to different
combinations of 1s and 0s.
This method used to transmit
information wirelessly is referred
to as Visible Light
Communication (VLC).
10.
11. PROBLEMS IN WI-FI
a) Capacity: Wireless data is transmitted through radio waves which are
limited ,expensive and has a limited bandwidth.
b) Efficiency: There are 1.4 million cellular radio base stations that
consume massive amount of energy. Most of the energy is used for
cooling down the base station instead of transmission. Therefore
efficiency of such base stations is only 5%.
c) Availability: It is not advisable to use mobile phones in aero planes
and at places like petrochemical plants and petrol pumps.
d) Security: Radio waves can penetrate through walls. They can be
intercepted. bad intentions, they may misuse it. This causes a major
security concern for Wi-Fi.
12. LI-FI IS BETTER THAN WI-FI
a) Capacity: Light has 10000 times
wider bandwidth than radio waves .
So, Li-Fi has got better capacity and
also the equipments are already
available.
b) Efficiency: Data transmission
using Li-Fi is very cheap. LED lights
consume less energy and are highly
efficient
. c) Availability: Availability is not
an issue as light sources are
present everywhere and they have
to be replaced with LEDs for proper
transmission of data.
d) Security: Light waves do not
penetrate through walls. So, they
can‘t be intercepted and misused.