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lifi

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lifi is a technology that uses LED's for data transmission . this presentation explains the problem with current RF technology and how lifi overcome it ,working of li-fi and its application

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lifi

  1. 1. College of Engineering Chengannur 1 God said, “Let there be light,” and there was light. God saw that the light was good Genesis-1
  2. 2. College of Engineering Chengannur 2 What are the basic needs of an Human Being TODAY?
  3. 3. College of Engineering Chengannur 3
  4. 4. College of Engineering Chengannur 4 ● The wireless communication is under great trouble today. ● RF communication system has many problems
  5. 5. College of Engineering Chengannur 5 Electro-Magnetic Spectrum
  6. 6. College of Engineering Chengannur 6 Issues Regarding RF Spectrum ● 1000 wireless devices per person in 2018 with IOT revolution . ● Due to the increasing demand for wireless data communication, the available radio spectrum below 10 GHz (cm-wave communication) has become insufficient. ● The available spectrum below 10 GHz (cm wave ) will run out by 2020 ● Energy consumption is very large for RF systems.
  7. 7. College of Engineering Chengannur 7 Security Issues Of Wi-Fi
  8. 8. College of Engineering Chengannur 8 Wi-Fi in restuarent ● Open Wi-Fi can accessed by external which eventually reduce speed . ● Closed WiFi (password protected ) systems are not practical in such areas . ● This is same in the case of offices etc. ● Hackers can miss use our password protected Wi-Fi systems .
  9. 9. College of Engineering Chengannur 9 Health Issues
  10. 10. College of Engineering Chengannur 10
  11. 11. College of Engineering Chengannur 11 WHO CAN REPLACE RADIO WAVES FOR WIRELESS COMMUNICATION ?
  12. 12. College of Engineering Chengannur 12
  13. 13. College of Engineering Chengannur 13
  14. 14. College of Engineering Chengannur 14 Li-Fi uses light emitting diodes (LEDs) for high speed wireless communication. Speeds of over 3 Gb/s is achieved using a single micro-LED
  15. 15. College of Engineering Chengannur 15
  16. 16. College of Engineering Chengannur 16 How Li-Fi works ?.. ● The intensity of the LEDs is varied by changing the current passed through them at very high speeds. However,the human eye cannot perceive this change and the LEDs appear to have a constant intensity. ● This ON-OFF activity of LED lights enables data transmission using binary codes i.e., when the LED isON, logical ‘1’ is transmitted and when the LED is OFF , logical ‘0’ is transmitted. ● Researcher has achieved speed up to 10 Gbps
  17. 17. College of Engineering Chengannur 17 Li-Fi system
  18. 18. College of Engineering Chengannur 18 SPAD (single photon avalanche diode) GaN micro LED Switching time is in pS switching time is pS range
  19. 19. College of Engineering Chengannur 19
  20. 20. College of Engineering Chengannur 20
  21. 21. College of Engineering Chengannur 21 Li-Fi products
  22. 22. College of Engineering Chengannur 22 Li-Fi enabled office
  23. 23. College of Engineering Chengannur 23 Potential Application Area IN AIRCRAFT CABIN IN PETROCHEMICAL INDUSTRIES
  24. 24. College of Engineering Chengannur 24 IN HOSPITALS IN TRAFFIC
  25. 25. College of Engineering Chengannur 25 Incorporation of LIFI Sensors in Light Posts Li-Fi in office
  26. 26. College of Engineering Chengannur 26
  27. 27. College of Engineering Chengannur 27 References [1]. RECENT ADVANCEMENTS IN LI-FI TECHNOLOGY ,International Journal of Electrical, Electronics and Data Communication, ISSN: 2320-2084 Volume-1,Issue-10, Dec-2013 [2]. Novel Architecture for Future Li-Fi Wireless Technology ,Alif Shah [3]. What is LiFi? Journal of Lightwave Technology. [4]. www.purelifi.com [5]. https://www.youtube.com/watchv=WRG9iXZbuAc [6]. infokairali 2014
  28. 28. College of Engineering Chengannur 28
  29. 29. College of Engineering Chengannur 29 THANK YOU A presentation by MUHAMMED ROSHAN P S7 B

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