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How does li-fi technology work

Li-Fi is a technology that uses the LIGHT EMITTING DIODES (LED) to transmit the wireless data and how to use li fi technology and future scope of lifi technology free ppt download
Li Fi (Light – Fidelity)Contents INTRODUCTION HOW LIFI IS DIFFERENT HISTORY OF LIFI LIFI CONSTRUCTION WHY LIFI COMES HOW LIFI WORKS LIFI VS WIFI FEATURES ADVANTAGES DIADVANTAGES APPLICATIONS FUTURE SCOPE CONCLUSIONIntroduction ▸ LiFi means “LIGHT FIDELITY” ▸ LiFi is fast and cheap optical version of wiFi. ▸ LiFi is a technology that uses the LIGHT EMITTING DIODES (LED) to transmit the data wirelessly . ▸ LiFi based on VISIBLE LIGHT COMMUNICATION (VLC). ▸ VLC is a data communication medium, which uses the visible light between 400 THz (780 nm) and 800 THz (375 nm) as optical carrier for data transmission.How LiFi Is Different LiFi 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.History of LiFi This technology was invented by German Physicist “HARALD HASS”, from the university of Edinburgh, U.K. He demonstrated it in the year 2012. But, the technology was truly began during the 1990‟s in countries like Germany, Korea Japan. where they discovered LED‟s could be retrofitted to send information UNIVERSITY OF EDINBURGH :LiFi Construction ▸ The LiFi product consists of three primary sub assemblies: ▸ Emitter (including bulb) ▸ RF Driver. ▸ Power supplyFunction of Bulb Assembly ▸ At the heart of LIFI is the bulb subassembly where a sealed bulb is embedded in a dielectric material. ▸ The dielectric material serves two purposes: ▸ 1) waveguide ▸ 2) Electric fieldRF Drive ▸ Power amplifier (PA) assembly that uses an LDMOS device. ▸ Converts electrical energy into RF power. ▸ The PA is designed for ruggedness and efficiency. ▸ The RF driver also contains controls circuit for digital and analog lighting controls.A Typical LiFi ScenarioWhy LiFi comes Due to Issues regarding with Radio frequency Spectrum Electromagnetic spectrum These are Capacity Availability Efficiency SecurityRadio Spectrum Issues Security Capacity • Less secure(passes  Radio waves. through the walls)  Cost and Expensive.  Less Bandwidth compared to other spectrums.  Insufficient spectrum for increasing Efficiency data.  Millions of base stations consume huge amount of energy for Availability 1.) Transmitting the radio waves  Available within the range of 2.) To cool the base station cabins Base stations.  Limited availability. 5 Efficiency  Unavailable in aircrafts.Electromagnetic SpectrumRadio Infrared Visible Ultraviolet Gama Rays X Rays Waves Rays Rays Rays • Gama rays cant be used as they could be dangerous. • Xrays 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 SPECTRUM.WHAT USES CAN REPLACE RADIO WAVES FOR WIRELESS COMMUNICATION THROUGH LIFI By the use of lifi we can replace radio waves for wireless communicationHow LiFi Works • Procedure is very simple, if the LED is on , then your device transmit a digit „1‟ if it is off, then your device transmit a digit „0‟. • The LED can be switched on off very quickly, which gives nice opportunities for transmitting data. • Hence, all that required is some LEDS a controller that code data into those LEDS.Comparison Between LiFi vs. WiFiFeatures of LiFi • CAPACITY 10,000 Times more spectrum then RW. Light boxes are already present, so infrastructure is available already and installed . • EFFICIENCY Highly efficient because LED consume less energy. • AVAILABLITY Light is present every where. Data is present where light is present. • SECURITY Light waves does not penetrate through walls. Hence they can not be INTERCEPTED.Advantages of LiFi • It is impossible to achieve more than 10Gbps, theoretically allowing a highdefinition film to be downloaded in 30 sec. • Mostly powered by LEDs so it is cost efficient MAPS Transmission of data is fast and easy.Disadvantages of LiFi Presence of light is essential There should be line of sight Works better with fluorescent light and LEDs but very low efficiency with bulbs.Applications of LiFi Street and traffic light Under water scenariosAirplane scenariosIn RF restricted environment Future Scope • This research report categories the global VLC technology market based on component, application and geography. • Lifi uses light emitting diodes (LEDs) which are rapidly gaining in popularity for standards light bulbs and other domestic and commercial purposes . They are expected to be ubiquitous in 20 years. • Still under research : • What will be effect of interference from external light sources like sun light and normal bulbs • What about the limited bandwidth of existing copper cable used for electrical connection.Future Scope • Where do the connections uplink, how serious are the modifications needed to the power grid. • How will other devices React if you Inject a high frequency in to Main Conclusion • 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 WiFi hotspots to transmit wireless data.Thanks Any questions You can find us at
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