Li-Fi Technology

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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 …

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.

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  • 1. Introduction  LiFi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission.  LiFi is designed to use LED light bulbs similar to those currently in use in many energy-conscious homes and offices.  However, LiFi bulbs are outfitted with a chip that modulates the light imperceptibly for optical data transmission.  LiFi data is transmitted by the LED bulbs and received by photoreceptors.
  • 2. History • Professor Harald Haas, from the University of Edinburgh in the UK, is widely recognised as the original founder of Li-Fi. • He coined the term Li-Fi and is Chair of Mobile Communications at the University of Edinburgh and co- founder of pureLiFi. • Haas promoted this technology in his 2011 TED Global talk and helped start a company to market it. • In October 2011, companies and industry groups formed the Li-Fi Consortium, to promote high-speed optical wireless systems. • The first Li-Fi smartphone prototype was presented at the Consumer Electronics Show in Las Vegas from January 7–10 in 2014. Prof. Harald Haas
  • 3. Li-1st, the first Li-Fi product
  • 4. Present Scenario 1.4 millions + 6.8 billion +
  • 5. Issues Regarding Radio Spectrum Capacity Availability Efficiency Security
  • 6. Insufficient spectrum for increasing data Low power application Which is not used so far. Dangerous for human body Used for hospitals It is not used generally Disadvantages Of Other Spectrums
  • 7. Working of LI-FI  The LEDs can be switched on and off very quickly which gives nice opportunity for data transfer in the form of Binary code.  Switching ON an LED is logical ‘1’,switching of an LED is logical ‘0’.  Hence it is possible to encode the data into the LED’s by using a controller ,we just have to vary at which LED’s flicker depending on the data we want to encode to give different strings of 0’s and 1’s.  UK researches say that using a micro-LED light bulb they have achieved a data transmission speed of 10Gbps using LI-FI.
  • 8. Main Components Of Communication System  A high brightness white LED, Which act as a communication source.  A silicon photodiode which shows good response to visible wavelength region serving as the receiving element. Receiving elements Transmitting elements
  • 9. Advantageous Due To Parallel Data Transmission.
  • 10. Differences Between Technologies
  • 11. Applications  RF Spectrum Relief  Smart Lighting  Mobile Connectivity  Hazardous Environments  Hospital & Healthcare  Aviation  Underwater Communications  Vehicles & Transportation  RF Avoidance  Location Based Services (LBS)  Toys
  • 12. Advantages  Higher speeds than Wi-Fi.  10000 times the frequency spectrum of radio.  More secure because data cannot be intercepted without a clear line of sight.  Prevents piggybacking.  Eliminates neighboring network interference.  Unimpeded by radio interference.  Does not create interference in sensitive electronics, making it better for use in environments like hospitals and aircraft.
  • 13. Disadvantages  Light can't pass through objects.  A major challenge facing Li-Fi is how the receiving device will transmit back to transmitter.  High installation cost of the VLC systems  Interferences from external light sources like sun, light, normal bulbs, opaque materials .
  • 14. Conclusion  By using Li-Fi in all the lights in and around a building, the technology could enable greater area of coverage than a single Wi-Fi router. Drawbacks to the technology include the need for a clear line of sight, difficulties with mobility and the requirement that lights stay on for operation.
  • 15. References  http://whatis.techtarget.com/definition/LiFi  http://www.dvice.com/archives/2012/08/lifi_ten_ways_i.php  http://electronicsforu.com/electronicsforu  http://purelifi.co.uk/what_is_li-fi/applicationsof_lifi/  http://en.wikipedia.org/wiki/Li-Fi
  • 16. Visit www.seminarlinks.blogspot.com to download