SlideShare una empresa de Scribd logo
1 de 17
Descargar para leer sin conexión
Li-FiLi-Fi
Light FidelityLight Fidelity
Post WiFi technology using Visual Light
Communication
SRUJAN A,
BT10CSE004
What is Li Fi?
● LiFi is an alternative to WiFi that transmits data using
Visible Light Communication rather instead of radio
frequency waves.
● It is a complement of RF Communication and it solves
RF Bandwith limitations.
● In Layman's terms,Li-Fi is transmitting data using actual
light bulbs. We can use internet on our device just when
the light bulb in our room is switched on.
Life of Li Fi
● Professor Harald Haas coined the term Li Fi and is the founder
of this technology, in 2011 TED global talk.
● The promotion of idea through TED helped to start a company
pureLiFi.
● PureLiFi, formerly pureVLC, is an original equipment
manufacturer firm set up to commercialize Li-Fi products for
integration with existing LED-lighting systems.
● In Oct'11, few companies and industry groups formed Li-Fi
Consortium to promote this high-speed optical wireless
systems.
● LiFi is verified experimentally and also is used in few places
already.
LiFi vs WiFi
● Both Wi-Fi and Li-Fi transmit data over the electromagnetic
spectrum, but whereas Wi-Fi utilises radio waves, Li-Fi uses
visible light. This is a distinct advantage in that the visible light is
far more plentiful than the radio spectrum (10,000 times more in
fact) and can achieve far greater data density.
● Data receiver using Li-Fi would have to be in sight of the
transmitter-bulb as visible light does not penetrate solid
materials, which is not the case of Wi Fi.
● Li-Fi is more secure than Wi-Fi with hackers unable to access
unsecured internet connections from out of sight of the
transmitter.
LiFi vs WiFi
Are Radio waves not fine?
● Capacity: 3G,4G making us running out of spectrum and
hence, radio waves are costly. Radio waves are also limited.
● Efficiency: 1.4 million cellular radio base stations each with
efficiency of just 5%. Most of the energy is used for cooling
down the base station rather than for transmission.
● Security: Radio waves can be transmitted through obstacles
and hence viable for security breach. So far, several successful
attempts were made in hacking.
● Availability: We cannot use our mobile phones which work with
the help of radio waves everywhere. Ex. To be switched off in
aircrafts.
Why only Visible Light?
● Gamma rays are dangerous for communication.
● X-rays can't be used for communication as they are to be used
in controlled environment and is costly.
● Ultravoilet rays are useful for skin to some extent but when
used for communication for long time, they are dangerous.
● Infrared rays are to be used at low power levels as their effects
on human eye.
● Radio waves shortcomings have been discussed earlier.
● Visible light has no above mentioned issues,is safe for human
and is faster.
How does LiFi work?
● On one end all the data on the internet will be
streamed to a lamp driver.
● When the LED is turned on the microchip converts this
digital data in the form of light.
● On the other end this light is detected by photo
sensitive devices.
● Next this light is amplified and processed and then fed
to the device.
● The heart of this technology is a new generation high
brightness led’s.
● These led’s varies in intensity (that is gets on and off)
so fast that a human eye cannot detect it.
● If led is on , then we transmit a digital signal 1,and if
the led is off , then we transmit a digital signal 0.
● A controller is connected at the back side of these led
bulbs to code data to these leds.
Li Fi construction
The LiFi product consists of 4 primary sub-assemblies:
1. 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 plasma generates
an intense source of light.
2. The Printed Circuit Board (PCB) controls the electrical inputs and outputs
of the lamp and houses the microcontroller used to manage different lamp
functions.
3. An RF (radio-frequency) signal is generated by the solid-state PA and is
guided into an electric field about the bulb.
4. All of these sub-assemblies are contained in an aluminum enclosure.
Illustration
Is it just theoritical?
● No, Herald had successfully demonstrated it using a table lamp.
● The first Li-Fi smartphone prototype was presented at the
Consumer Electronics Show in Las Vegas from January 7–10 in
2014. The phone uses CONNECT, a technique that converts
light waves into usable energy, making the phone capable of
receiving and decoding signals without drawing on its battery.A
clear thin layer of crystal glass can be added to small screens
like watches and smartphones that make them solar powered.
Smartphones could gain 15% more battery life during a typical
day. This first smartphones using this technology should arrive
in 2015. This screen can also work to receive Li-Fi signals and
so can the smartphone camera.The cost of these screens per
smartphone is between $2 and $3, much cheaper than most
new technologies.
● Philips lighting company has developed a Li-Fi system for
shoppers at stores. They have to download an app on their
smartphone and then their smartphone works with the LEDs in
the store. The LEDs can pinpoint where they are at in the store
and give them corresponding coupons and information based
on where aisle they are on and what they are looking at.
● The technology is ready right now. It's being installed in
museums and businesses across France, and is being
embraced by EDF, one of the nation's largest utilities.
Where can it be used?
● Everywhere in every field as we use Visible light extensively
including hospitals,aircrafts,etc without bothering about any
harm.
● It can be used in home, office, businesses, museums, etc which
can be used as light, security and data transmission as well.
● It can be used in traffic control (pic demonstrated.)
● Having them on street lights takes the internet usage to a
higher level.
Traffic Control
Limitations
● There should be line of sight between sender and receiver (This has been
proved to be not necessary experimentally but yet to verify in daily life)
● Visible light cannot penetrate through solid objects
● Interference with other electromagnetic waves makes the transmitting data
to distort.
● Light cannot approach the range of radio waves
● A major challenge facing Li-Fi is how the receiving device will transmit
back to transmitter.
● Interferences from external light sources like sun light, normal bulbs, and
opaque materials in the path of transmission will cause interruption in the
communication.
Open for
Questions &
Discussion

Más contenido relacionado

La actualidad más candente (20)

LIGHT FIDELITY TECHNOLOGY (LI - FI)
LIGHT FIDELITY TECHNOLOGY (LI - FI)LIGHT FIDELITY TECHNOLOGY (LI - FI)
LIGHT FIDELITY TECHNOLOGY (LI - FI)
 
LiFi Technology - Unfolding Future
LiFi Technology - Unfolding FutureLiFi Technology - Unfolding Future
LiFi Technology - Unfolding Future
 
Lifi Technology
Lifi TechnologyLifi Technology
Lifi Technology
 
LiFi technology
LiFi technologyLiFi technology
LiFi technology
 
LIFI
LIFILIFI
LIFI
 
Slide on lifi
Slide on lifiSlide on lifi
Slide on lifi
 
Li fi Technology
Li fi TechnologyLi fi Technology
Li fi Technology
 
WI FI VS LI FI
WI FI VS LI FIWI FI VS LI FI
WI FI VS LI FI
 
Lifi technology
Lifi technologyLifi technology
Lifi technology
 
Li-Fi
Li-FiLi-Fi
Li-Fi
 
Li-fi technology presentation
Li-fi technology presentationLi-fi technology presentation
Li-fi technology presentation
 
Light fidelity(Li Fi)
Light fidelity(Li Fi)Light fidelity(Li Fi)
Light fidelity(Li Fi)
 
LIFI TECHNOLOGY
LIFI TECHNOLOGYLIFI TECHNOLOGY
LIFI TECHNOLOGY
 
IoT Enabled by LiFi Technology
IoT Enabled by LiFi TechnologyIoT Enabled by LiFi Technology
IoT Enabled by LiFi Technology
 
Lifi Technology
Lifi TechnologyLifi Technology
Lifi Technology
 
Li fi technology
Li fi technologyLi fi technology
Li fi technology
 
Lifi
LifiLifi
Lifi
 
Li-Fi Technology (Perfect slides)
Li-Fi Technology (Perfect slides)Li-Fi Technology (Perfect slides)
Li-Fi Technology (Perfect slides)
 
LIFI TECHNOLOGY
LIFI TECHNOLOGYLIFI TECHNOLOGY
LIFI TECHNOLOGY
 
Lifi final
Lifi finalLifi final
Lifi final
 

Destacado

Lifi technology documentation
Lifi technology documentationLifi technology documentation
Lifi technology documentationSowjanya Jajaila
 
Li-Fi technology
Li-Fi technologyLi-Fi technology
Li-Fi technologyStudent
 
Li-fi technology
Li-fi technologyLi-fi technology
Li-fi technologyMd Al Ameen
 
ppt on LIFI TECHNOLOGY
ppt on LIFI TECHNOLOGYppt on LIFI TECHNOLOGY
ppt on LIFI TECHNOLOGYtanshu singh
 
Li-fi best n short
Li-fi best n shortLi-fi best n short
Li-fi best n shortPratik dave
 
LiFi Technology - Information Technology Project Management
LiFi Technology - Information Technology Project Management LiFi Technology - Information Technology Project Management
LiFi Technology - Information Technology Project Management Atef Amer
 
WIFI Presentation and How it has Improved my life
WIFI Presentation and How it has Improved my lifeWIFI Presentation and How it has Improved my life
WIFI Presentation and How it has Improved my lifeRahul Barick
 
Pic 16f877 a
Pic 16f877 aPic 16f877 a
Pic 16f877 abmsjh
 
Wireless Light Sensor(WL ID-01)
Wireless Light Sensor(WL ID-01)Wireless Light Sensor(WL ID-01)
Wireless Light Sensor(WL ID-01)Daniel Chen
 
Social Wifi- Light Bulb Ad
Social Wifi- Light Bulb Ad Social Wifi- Light Bulb Ad
Social Wifi- Light Bulb Ad Pham Huu Nghia
 
Light Fidelity(Li-Fi) Technology
Light Fidelity(Li-Fi) TechnologyLight Fidelity(Li-Fi) Technology
Light Fidelity(Li-Fi) TechnologySayan Chatterjee
 

Destacado (20)

Li-Fi technology
Li-Fi technologyLi-Fi technology
Li-Fi technology
 
Lifi ppt
Lifi pptLifi ppt
Lifi ppt
 
Li-Fi technology
Li-Fi technologyLi-Fi technology
Li-Fi technology
 
Lifi technology documentation
Lifi technology documentationLifi technology documentation
Lifi technology documentation
 
Li-Fi technology
Li-Fi technologyLi-Fi technology
Li-Fi technology
 
Li-Fi
Li-FiLi-Fi
Li-Fi
 
Li-fi technology
Li-fi technologyLi-fi technology
Li-fi technology
 
ppt on LIFI TECHNOLOGY
ppt on LIFI TECHNOLOGYppt on LIFI TECHNOLOGY
ppt on LIFI TECHNOLOGY
 
li-fi technology
li-fi technologyli-fi technology
li-fi technology
 
Li-fi best n short
Li-fi best n shortLi-fi best n short
Li-fi best n short
 
LiFi Technology - Information Technology Project Management
LiFi Technology - Information Technology Project Management LiFi Technology - Information Technology Project Management
LiFi Technology - Information Technology Project Management
 
WIFI Presentation and How it has Improved my life
WIFI Presentation and How it has Improved my lifeWIFI Presentation and How it has Improved my life
WIFI Presentation and How it has Improved my life
 
wifi technology
wifi technologywifi technology
wifi technology
 
41 wifi technology
41 wifi technology41 wifi technology
41 wifi technology
 
Smart Sensors , Stadium Light Sensor , IDM9
Smart Sensors , Stadium Light Sensor , IDM9Smart Sensors , Stadium Light Sensor , IDM9
Smart Sensors , Stadium Light Sensor , IDM9
 
Pic 16f877 a
Pic 16f877 aPic 16f877 a
Pic 16f877 a
 
Wireless Light Sensor(WL ID-01)
Wireless Light Sensor(WL ID-01)Wireless Light Sensor(WL ID-01)
Wireless Light Sensor(WL ID-01)
 
Social Wifi- Light Bulb Ad
Social Wifi- Light Bulb Ad Social Wifi- Light Bulb Ad
Social Wifi- Light Bulb Ad
 
WIFI TECHNOLOGY
WIFI TECHNOLOGYWIFI TECHNOLOGY
WIFI TECHNOLOGY
 
Light Fidelity(Li-Fi) Technology
Light Fidelity(Li-Fi) TechnologyLight Fidelity(Li-Fi) Technology
Light Fidelity(Li-Fi) Technology
 

Similar a LI-FI

Similar a LI-FI (20)

Lifi technology(nimesh bariya)
Lifi technology(nimesh bariya)Lifi technology(nimesh bariya)
Lifi technology(nimesh bariya)
 
Li Fi Technology PPT
Li Fi  Technology PPTLi Fi  Technology PPT
Li Fi Technology PPT
 
lifi technology..pptx
lifi technology..pptxlifi technology..pptx
lifi technology..pptx
 
LIFI TECHNOLOGY
LIFI TECHNOLOGYLIFI TECHNOLOGY
LIFI TECHNOLOGY
 
LI-FI TECHNOLOGY
LI-FI TECHNOLOGYLI-FI TECHNOLOGY
LI-FI TECHNOLOGY
 
Lifi(seminar)
Lifi(seminar)Lifi(seminar)
Lifi(seminar)
 
What is Li-Fi ?
What is Li-Fi ?What is Li-Fi ?
What is Li-Fi ?
 
seminar ppt on li-fi.pptx
seminar ppt on li-fi.pptxseminar ppt on li-fi.pptx
seminar ppt on li-fi.pptx
 
Li fi technology
Li fi  technologyLi fi  technology
Li fi technology
 
Lifi Technology
Lifi TechnologyLifi Technology
Lifi Technology
 
LiFi
LiFiLiFi
LiFi
 
Li fi technology by mandaji sai kumar 475
Li fi technology by mandaji sai kumar 475Li fi technology by mandaji sai kumar 475
Li fi technology by mandaji sai kumar 475
 
LiFI TECHNOLOGY
LiFI TECHNOLOGYLiFI TECHNOLOGY
LiFI TECHNOLOGY
 
Lifi by krce
Lifi by krceLifi by krce
Lifi by krce
 
Li fi technology
Li fi technologyLi fi technology
Li fi technology
 
Li fi alpna singh
Li fi  alpna singhLi fi  alpna singh
Li fi alpna singh
 
@Paper Presentation on Li-Fi (light fidelity system)
@Paper Presentation on Li-Fi (light fidelity system)@Paper Presentation on Li-Fi (light fidelity system)
@Paper Presentation on Li-Fi (light fidelity system)
 
Li fi(led transmission of data) presentation
Li fi(led transmission of data) presentationLi fi(led transmission of data) presentation
Li fi(led transmission of data) presentation
 
Li-Fi Technology
Li-Fi Technology Li-Fi Technology
Li-Fi Technology
 
LI-FI Presentation
LI-FI  Presentation LI-FI  Presentation
LI-FI Presentation
 

Último

UiPath Solutions Management Preview - Northern CA Chapter - March 22.pdf
UiPath Solutions Management Preview - Northern CA Chapter - March 22.pdfUiPath Solutions Management Preview - Northern CA Chapter - March 22.pdf
UiPath Solutions Management Preview - Northern CA Chapter - March 22.pdfDianaGray10
 
Using IESVE for Loads, Sizing and Heat Pump Modeling to Achieve Decarbonization
Using IESVE for Loads, Sizing and Heat Pump Modeling to Achieve DecarbonizationUsing IESVE for Loads, Sizing and Heat Pump Modeling to Achieve Decarbonization
Using IESVE for Loads, Sizing and Heat Pump Modeling to Achieve DecarbonizationIES VE
 
How to Effectively Monitor SD-WAN and SASE Environments with ThousandEyes
How to Effectively Monitor SD-WAN and SASE Environments with ThousandEyesHow to Effectively Monitor SD-WAN and SASE Environments with ThousandEyes
How to Effectively Monitor SD-WAN and SASE Environments with ThousandEyesThousandEyes
 
GenAI and AI GCC State of AI_Object Automation Inc
GenAI and AI GCC State of AI_Object Automation IncGenAI and AI GCC State of AI_Object Automation Inc
GenAI and AI GCC State of AI_Object Automation IncObject Automation
 
Introduction to Quantum Computing
Introduction to Quantum ComputingIntroduction to Quantum Computing
Introduction to Quantum ComputingGDSC PJATK
 
RAG Patterns and Vector Search in Generative AI
RAG Patterns and Vector Search in Generative AIRAG Patterns and Vector Search in Generative AI
RAG Patterns and Vector Search in Generative AIUdaiappa Ramachandran
 
Cybersecurity Workshop #1.pptx
Cybersecurity Workshop #1.pptxCybersecurity Workshop #1.pptx
Cybersecurity Workshop #1.pptxGDSC PJATK
 
Babel Compiler - Transforming JavaScript for All Browsers.pptx
Babel Compiler - Transforming JavaScript for All Browsers.pptxBabel Compiler - Transforming JavaScript for All Browsers.pptx
Babel Compiler - Transforming JavaScript for All Browsers.pptxYounusS2
 
Videogame localization & technology_ how to enhance the power of translation.pdf
Videogame localization & technology_ how to enhance the power of translation.pdfVideogame localization & technology_ how to enhance the power of translation.pdf
Videogame localization & technology_ how to enhance the power of translation.pdfinfogdgmi
 
Cloud Revolution: Exploring the New Wave of Serverless Spatial Data
Cloud Revolution: Exploring the New Wave of Serverless Spatial DataCloud Revolution: Exploring the New Wave of Serverless Spatial Data
Cloud Revolution: Exploring the New Wave of Serverless Spatial DataSafe Software
 
UiPath Platform: The Backend Engine Powering Your Automation - Session 1
UiPath Platform: The Backend Engine Powering Your Automation - Session 1UiPath Platform: The Backend Engine Powering Your Automation - Session 1
UiPath Platform: The Backend Engine Powering Your Automation - Session 1DianaGray10
 
Empowering Africa's Next Generation: The AI Leadership Blueprint
Empowering Africa's Next Generation: The AI Leadership BlueprintEmpowering Africa's Next Generation: The AI Leadership Blueprint
Empowering Africa's Next Generation: The AI Leadership BlueprintMahmoud Rabie
 
Machine Learning Model Validation (Aijun Zhang 2024).pdf
Machine Learning Model Validation (Aijun Zhang 2024).pdfMachine Learning Model Validation (Aijun Zhang 2024).pdf
Machine Learning Model Validation (Aijun Zhang 2024).pdfAijun Zhang
 
Introduction to Matsuo Laboratory (ENG).pptx
Introduction to Matsuo Laboratory (ENG).pptxIntroduction to Matsuo Laboratory (ENG).pptx
Introduction to Matsuo Laboratory (ENG).pptxMatsuo Lab
 
Connector Corner: Extending LLM automation use cases with UiPath GenAI connec...
Connector Corner: Extending LLM automation use cases with UiPath GenAI connec...Connector Corner: Extending LLM automation use cases with UiPath GenAI connec...
Connector Corner: Extending LLM automation use cases with UiPath GenAI connec...DianaGray10
 
Salesforce Miami User Group Event - 1st Quarter 2024
Salesforce Miami User Group Event - 1st Quarter 2024Salesforce Miami User Group Event - 1st Quarter 2024
Salesforce Miami User Group Event - 1st Quarter 2024SkyPlanner
 
Spring24-Release Overview - Wellingtion User Group-1.pdf
Spring24-Release Overview - Wellingtion User Group-1.pdfSpring24-Release Overview - Wellingtion User Group-1.pdf
Spring24-Release Overview - Wellingtion User Group-1.pdfAnna Loughnan Colquhoun
 
Meet the new FSP 3000 M-Flex800™
Meet the new FSP 3000 M-Flex800™Meet the new FSP 3000 M-Flex800™
Meet the new FSP 3000 M-Flex800™Adtran
 
Things you didn't know you can use in your Salesforce
Things you didn't know you can use in your SalesforceThings you didn't know you can use in your Salesforce
Things you didn't know you can use in your SalesforceMartin Humpolec
 
NIST Cybersecurity Framework (CSF) 2.0 Workshop
NIST Cybersecurity Framework (CSF) 2.0 WorkshopNIST Cybersecurity Framework (CSF) 2.0 Workshop
NIST Cybersecurity Framework (CSF) 2.0 WorkshopBachir Benyammi
 

Último (20)

UiPath Solutions Management Preview - Northern CA Chapter - March 22.pdf
UiPath Solutions Management Preview - Northern CA Chapter - March 22.pdfUiPath Solutions Management Preview - Northern CA Chapter - March 22.pdf
UiPath Solutions Management Preview - Northern CA Chapter - March 22.pdf
 
Using IESVE for Loads, Sizing and Heat Pump Modeling to Achieve Decarbonization
Using IESVE for Loads, Sizing and Heat Pump Modeling to Achieve DecarbonizationUsing IESVE for Loads, Sizing and Heat Pump Modeling to Achieve Decarbonization
Using IESVE for Loads, Sizing and Heat Pump Modeling to Achieve Decarbonization
 
How to Effectively Monitor SD-WAN and SASE Environments with ThousandEyes
How to Effectively Monitor SD-WAN and SASE Environments with ThousandEyesHow to Effectively Monitor SD-WAN and SASE Environments with ThousandEyes
How to Effectively Monitor SD-WAN and SASE Environments with ThousandEyes
 
GenAI and AI GCC State of AI_Object Automation Inc
GenAI and AI GCC State of AI_Object Automation IncGenAI and AI GCC State of AI_Object Automation Inc
GenAI and AI GCC State of AI_Object Automation Inc
 
Introduction to Quantum Computing
Introduction to Quantum ComputingIntroduction to Quantum Computing
Introduction to Quantum Computing
 
RAG Patterns and Vector Search in Generative AI
RAG Patterns and Vector Search in Generative AIRAG Patterns and Vector Search in Generative AI
RAG Patterns and Vector Search in Generative AI
 
Cybersecurity Workshop #1.pptx
Cybersecurity Workshop #1.pptxCybersecurity Workshop #1.pptx
Cybersecurity Workshop #1.pptx
 
Babel Compiler - Transforming JavaScript for All Browsers.pptx
Babel Compiler - Transforming JavaScript for All Browsers.pptxBabel Compiler - Transforming JavaScript for All Browsers.pptx
Babel Compiler - Transforming JavaScript for All Browsers.pptx
 
Videogame localization & technology_ how to enhance the power of translation.pdf
Videogame localization & technology_ how to enhance the power of translation.pdfVideogame localization & technology_ how to enhance the power of translation.pdf
Videogame localization & technology_ how to enhance the power of translation.pdf
 
Cloud Revolution: Exploring the New Wave of Serverless Spatial Data
Cloud Revolution: Exploring the New Wave of Serverless Spatial DataCloud Revolution: Exploring the New Wave of Serverless Spatial Data
Cloud Revolution: Exploring the New Wave of Serverless Spatial Data
 
UiPath Platform: The Backend Engine Powering Your Automation - Session 1
UiPath Platform: The Backend Engine Powering Your Automation - Session 1UiPath Platform: The Backend Engine Powering Your Automation - Session 1
UiPath Platform: The Backend Engine Powering Your Automation - Session 1
 
Empowering Africa's Next Generation: The AI Leadership Blueprint
Empowering Africa's Next Generation: The AI Leadership BlueprintEmpowering Africa's Next Generation: The AI Leadership Blueprint
Empowering Africa's Next Generation: The AI Leadership Blueprint
 
Machine Learning Model Validation (Aijun Zhang 2024).pdf
Machine Learning Model Validation (Aijun Zhang 2024).pdfMachine Learning Model Validation (Aijun Zhang 2024).pdf
Machine Learning Model Validation (Aijun Zhang 2024).pdf
 
Introduction to Matsuo Laboratory (ENG).pptx
Introduction to Matsuo Laboratory (ENG).pptxIntroduction to Matsuo Laboratory (ENG).pptx
Introduction to Matsuo Laboratory (ENG).pptx
 
Connector Corner: Extending LLM automation use cases with UiPath GenAI connec...
Connector Corner: Extending LLM automation use cases with UiPath GenAI connec...Connector Corner: Extending LLM automation use cases with UiPath GenAI connec...
Connector Corner: Extending LLM automation use cases with UiPath GenAI connec...
 
Salesforce Miami User Group Event - 1st Quarter 2024
Salesforce Miami User Group Event - 1st Quarter 2024Salesforce Miami User Group Event - 1st Quarter 2024
Salesforce Miami User Group Event - 1st Quarter 2024
 
Spring24-Release Overview - Wellingtion User Group-1.pdf
Spring24-Release Overview - Wellingtion User Group-1.pdfSpring24-Release Overview - Wellingtion User Group-1.pdf
Spring24-Release Overview - Wellingtion User Group-1.pdf
 
Meet the new FSP 3000 M-Flex800™
Meet the new FSP 3000 M-Flex800™Meet the new FSP 3000 M-Flex800™
Meet the new FSP 3000 M-Flex800™
 
Things you didn't know you can use in your Salesforce
Things you didn't know you can use in your SalesforceThings you didn't know you can use in your Salesforce
Things you didn't know you can use in your Salesforce
 
NIST Cybersecurity Framework (CSF) 2.0 Workshop
NIST Cybersecurity Framework (CSF) 2.0 WorkshopNIST Cybersecurity Framework (CSF) 2.0 Workshop
NIST Cybersecurity Framework (CSF) 2.0 Workshop
 

LI-FI

  • 1. Li-FiLi-Fi Light FidelityLight Fidelity Post WiFi technology using Visual Light Communication SRUJAN A, BT10CSE004
  • 2. What is Li Fi? ● LiFi is an alternative to WiFi that transmits data using Visible Light Communication rather instead of radio frequency waves. ● It is a complement of RF Communication and it solves RF Bandwith limitations. ● In Layman's terms,Li-Fi is transmitting data using actual light bulbs. We can use internet on our device just when the light bulb in our room is switched on.
  • 3. Life of Li Fi ● Professor Harald Haas coined the term Li Fi and is the founder of this technology, in 2011 TED global talk. ● The promotion of idea through TED helped to start a company pureLiFi. ● PureLiFi, formerly pureVLC, is an original equipment manufacturer firm set up to commercialize Li-Fi products for integration with existing LED-lighting systems. ● In Oct'11, few companies and industry groups formed Li-Fi Consortium to promote this high-speed optical wireless systems. ● LiFi is verified experimentally and also is used in few places already.
  • 4. LiFi vs WiFi ● Both Wi-Fi and Li-Fi transmit data over the electromagnetic spectrum, but whereas Wi-Fi utilises radio waves, Li-Fi uses visible light. This is a distinct advantage in that the visible light is far more plentiful than the radio spectrum (10,000 times more in fact) and can achieve far greater data density. ● Data receiver using Li-Fi would have to be in sight of the transmitter-bulb as visible light does not penetrate solid materials, which is not the case of Wi Fi. ● Li-Fi is more secure than Wi-Fi with hackers unable to access unsecured internet connections from out of sight of the transmitter.
  • 6. Are Radio waves not fine? ● Capacity: 3G,4G making us running out of spectrum and hence, radio waves are costly. Radio waves are also limited. ● Efficiency: 1.4 million cellular radio base stations each with efficiency of just 5%. Most of the energy is used for cooling down the base station rather than for transmission. ● Security: Radio waves can be transmitted through obstacles and hence viable for security breach. So far, several successful attempts were made in hacking. ● Availability: We cannot use our mobile phones which work with the help of radio waves everywhere. Ex. To be switched off in aircrafts.
  • 7. Why only Visible Light? ● Gamma rays are dangerous for communication. ● X-rays can't be used for communication as they are to be used in controlled environment and is costly. ● Ultravoilet rays are useful for skin to some extent but when used for communication for long time, they are dangerous. ● Infrared rays are to be used at low power levels as their effects on human eye. ● Radio waves shortcomings have been discussed earlier. ● Visible light has no above mentioned issues,is safe for human and is faster.
  • 9. ● On one end all the data on the internet will be streamed to a lamp driver. ● When the LED is turned on the microchip converts this digital data in the form of light. ● On the other end this light is detected by photo sensitive devices. ● Next this light is amplified and processed and then fed to the device. ● The heart of this technology is a new generation high brightness led’s. ● These led’s varies in intensity (that is gets on and off) so fast that a human eye cannot detect it. ● If led is on , then we transmit a digital signal 1,and if the led is off , then we transmit a digital signal 0. ● A controller is connected at the back side of these led bulbs to code data to these leds.
  • 10. Li Fi construction The LiFi product consists of 4 primary sub-assemblies: 1. 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 plasma generates an intense source of light. 2. The Printed Circuit Board (PCB) controls the electrical inputs and outputs of the lamp and houses the microcontroller used to manage different lamp functions. 3. An RF (radio-frequency) signal is generated by the solid-state PA and is guided into an electric field about the bulb. 4. All of these sub-assemblies are contained in an aluminum enclosure.
  • 12. Is it just theoritical? ● No, Herald had successfully demonstrated it using a table lamp. ● The first Li-Fi smartphone prototype was presented at the Consumer Electronics Show in Las Vegas from January 7–10 in 2014. The phone uses CONNECT, a technique that converts light waves into usable energy, making the phone capable of receiving and decoding signals without drawing on its battery.A clear thin layer of crystal glass can be added to small screens like watches and smartphones that make them solar powered. Smartphones could gain 15% more battery life during a typical day. This first smartphones using this technology should arrive in 2015. This screen can also work to receive Li-Fi signals and so can the smartphone camera.The cost of these screens per smartphone is between $2 and $3, much cheaper than most new technologies.
  • 13. ● Philips lighting company has developed a Li-Fi system for shoppers at stores. They have to download an app on their smartphone and then their smartphone works with the LEDs in the store. The LEDs can pinpoint where they are at in the store and give them corresponding coupons and information based on where aisle they are on and what they are looking at. ● The technology is ready right now. It's being installed in museums and businesses across France, and is being embraced by EDF, one of the nation's largest utilities.
  • 14. Where can it be used? ● Everywhere in every field as we use Visible light extensively including hospitals,aircrafts,etc without bothering about any harm. ● It can be used in home, office, businesses, museums, etc which can be used as light, security and data transmission as well. ● It can be used in traffic control (pic demonstrated.) ● Having them on street lights takes the internet usage to a higher level.
  • 16. Limitations ● There should be line of sight between sender and receiver (This has been proved to be not necessary experimentally but yet to verify in daily life) ● Visible light cannot penetrate through solid objects ● Interference with other electromagnetic waves makes the transmitting data to distort. ● Light cannot approach the range of radio waves ● A major challenge facing Li-Fi is how the receiving device will transmit back to transmitter. ● Interferences from external light sources like sun light, normal bulbs, and opaque materials in the path of transmission will cause interruption in the communication.