Lifi by krce

PowerPoint Presentation

Light fidelity technologyli-fiUnder the guidance of

Mr.Natarajan M.EAP/CSE

Presented byAakash A Aravindaraj KMalavan PManimuthu M

OutlineWhat is Li-Fi?Need for Li-FiPresent scenarioLife and history of Li-FiOvercoming Wi-Fi issuesElectromagnetic spectrum and VLCConstruction, working and ImplementationComparisionApplicationsAdvantages and disadvantagesConclusion

What is Li-Fi ?

Light-FidelitySending data through LEDIntensity is faster than human eye can followOptical version of the Wi-Fi The fastest and cheapest wireless communication

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Li-fi technology

NEED FOR LI-FI Radio spectrum is congested, but the demand for wireless data doubles each year Issues regarding radio spectrum Speed of data transmission can be increased.

PRESENT SCENARIORadio Spectrum is congested but the demand for wireless data double each year .Every thing, it seems want to use wireless data but the capacity is drying up.So what can carry this excess demand in the future.Drawbacks - Capacity, Availability, Security & Efficiency.

GENESIS OF Li-fiHarald Hass, a professor at the University of Edinburgh who began his research in the field in 2004, gave a debut demonstration of what he called a Li-Fi prototype at the TEDGlobal conference in Edinburgh on 12th July 2011. 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 .

History of lifiThe technology truly began during the 1990'sIntroduced by Professor Herald hass, at the university of Edinburgh.Established in 2011 TED global talkIn October 2011, few companies and industries group formed

Life of lifiEstablished in 2011 TED global talk The promotion of idea through TED helped to start a company, Pure LiFi Pure LiFi, formerly pure VLC, is an original equipment manufacture firm setup to commercialize Li-Fi products for integration with existing LED lighting systemsIn October 2011, few companies and industries group formed Li-Fi consortium to promote the high speed optical wireless systems

OVERCOMING WIFI ISSUESCAPACITYSpectrum is 10,000 times greater than that of radio frequencyEFFICIENCYHighly efficient since LED consumes less energyAVAILABILITYLight waves available everywhere. SECURITYCannot penetrate through walls. Hence data cannot be intercepted.

Why only in vlc? Gama rays cant 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 VISIBLE - LIGHT COMMUNICATION.

How li-fi is different?Li-Fi technology is based on LEDs for the transfer of data.The transfer of the data can be with the help of all kind of light i.e., Light may be Invisible, Ultraviolet or Visible part of spectrum.The speed of the internet is incredibly high and the user everything in just a few minutes.

Who can replace radio waves for wireless communication?

Li-Fi

CONSTRUCTION OF LI-FI Li-Fi product consists of 4 primary sub-assemblies:BulbRF power amplifier circuit (PA)Printed Circuit Board (PCB)Enclosure

CONSTRUCTION OF LI-FI in detailThe PCB controls the electric inputs and outputs of the lamp and houses the microcontroller used to manage different lamp functions.An RF (Radio-Frequency) signal is generated by the solid-state PA and is guided into an electronic 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 bulbs center; this controlled plasma generates an intense source of light.All of these sub-assemblies are contained in an aluminum enclosure.

How Li-Fi works.. Its working is much simply explained as follows:If the LED is on, the digital 1 is transmitted.And if it is off, the digital 0 is transmitted.It is possible to encode data in the light by varying the rate at which the LEDs flicker on and off to give different strings of 1s and 0s.Operational procedure is very simple.LEDs varies in intensity so fast that a human eye cannot detect itA controller connected at the back side of these LEDs is used to code data.Also called as 5G optical communication.

Working processOn one end all the data on the internet will be streamed to a lamp driver when the led is turned on the microchip converts the digital data in form of light.A light sensitive device (photo detector) receives the signal and converts it back into original data. This method of using rapid pulses of light to transmit information wirelessly is technically referred as Visible Light Communication .

LI-FI NETWORKS Li-Fi connector and router are the main components for a network Room connector:Optical signals cannot penetrate through walls, in order to provide an optical WLAN, rooms need to be connected with each otherLi-Fi room connector is a replicator, which sends the data stream from one side of the wall to the other side via an optical fiber.For smaller rooms, connector act as the only Li-Fi hotspot in the room

LI-FI ROUTERServes as a connector to external link like DSL. Covers a radius of about 20 meters The transmission speed is 100 Mbps. Suitable for small office or home use

COMPARISION OF LI-FI VS WI-FI

Difference Between The TechnologiesTechnologySpeedData densityWiredFire wire800 Mbps*****USB 3.05 Gbps*****Thunderbolt 2X 10 Gbps *****Wireless (current)Wi-Fi IEE(802.11N)150 Mbps*Bluetooth3 Mbps*IrDA4 Mbps***Wireless (Future)Wi-Gig2 Gbps**Giga-IR1 Gbps***Li-Fi>10 Gbps*****

APPLICATIONS LIFI can be used in sensitive areas such as aircrafts for data transmission without causing interferencePlaces where it is difficult to lay optical fibers like operation theatersTraffic scenarios, thereby reducing accidentsUnderwater applications where radio waves cannot propagate.Industries like petrochemical plants, nuclear power plants , petrol pumps etc

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.

Intrinsically Safe Environment

Visible Light is more safe than RF, hence it can be used in places where RF can't be used such as petrochemical plants .

Hospitals(In Few Medical Equipment)

On Ocean Beds

Li-Fi can even work underwater were Wi-Fi fails completely, thereby throwing open endless opportunities for military/navigation operations.

Street Lamps There are millions of street lamps deployed around the world. Each of these street lamps could be a free access point.

TRAFFIC SCENARIOIn traffic scenario, LIFI can be used to communicate with the LED lights of cars.Cars can have LED-based headlights, backlights and can communicate with each other.This might prevent accidents, by exchanging information, when the vehicles are too close

LECTURE / SEMINAR HALLS Downloading notes from blogs of teachers.Sharing views and queries with the entire class.

INDUSTRIES Used in RF restricted environments like chemical industries, nuclear power plants, petrol pumps

HOME AND SMALL OFFICESIn home and small offices, Li-Fi can be used to communicate with devices likeLaptopsInternet accessHD video streamingPrinter

A PROVEN TECHNOLOGY

VLC SMARTPHONES The first VLC Smartphone was presented by Consumer Electronics in January, 2014 The phone uses Wysips connect a clear thin layer of crystal glass is added to the small screens Smartphone makes them solar powered.Smartphone could get 15% more battery life in a dayCan communicate using Li-Fi.

ADVANTAGES Data rate greater than 10 Gbps Can be used anywhere, even in RF restricted AREASConsumes less energy.Cost efficientSecured communicationIt is quick and reliable.

LimitationsLight can't pass through objects.Interferences from external light will cause interruption in the communication.Li-Fi requires line of sight. High installation cost of the VLC systems.A major challenge facing Li-Fi is how the receiving device will transmit back to transmitter.

ConclusionThus, if Li-Fi technology can be put into practical use, every bulb can be used as an alternative to Wi-Fi hotspots. It provides simple, faster and efficient wireless data communication. Li-Fi will make us to proceed towards the cleaner, greener, safer and brighter future.

Thank you

ANY QUESTIONS?