ppt on lifi

• 1. LIGHT FIDELITY (LI-FI) PRESENTED BY- DIVYANSHU VISHAL 9913004009 KALASALINGAM UNIVERSITY

2. WHAT IS WI-FI??? ISSUES REGARDING WI-FI (RADIO SPECTRUM) PROBLEM WITH OTHER SPECTRUM SOLUTION VISIBLE LIGHT COMMUNICATION PRINCIPLE OF LI-FI TECHNOLOGY CONSTRUCTION AND WORKING OF LI-FI COMPARISON BETWEEN PRESENT TECHNOLOGY AND LI-FI FUTURE APPLICATIONS OF LI-FI ADVANTAGES AND DISADVANTAGES CONCLUSION Contents 3. It is a local area wireless technology that allows an electronic device to exchange data or connect to the internet using 2.4GHz UHF and 5GHz SHF radio waves. It is based on IEE 802.11 standards. WiFi can be less secure than wired connections. 4. Capacity Availability Efficiency Security 5. Radio Waves Infrared Rays Visible Rays Ultraviolet Rays X- Rays Gama Rays Problem With Other Spectrum 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 besides with low power. HENCE WE LEFT WITH THE ONLY THE VISIBLE - LIGHT SPECTRUM. 6. Radio Waves Spectrum Visible Spectrum 7. ONE GERMEN PHYSICIST. HARALD HAAS HAS COME UP WITH A SOLUTION HE CALLS DATA THROUGH ILLUMINATION D-LIGHT TAKING THE FIBER OUT OF FIBBER OPTIC BY SENDING DATA THROUGH AN LED LIGHT BULB THAT VARIES IN INTENSITY FASTER THAN THE HUMAN EYE CAN FOLLOW. 8. Visible light communication is a data communication medium using visible light medium between 400 and 800 THz. The technology uses fluorescent lamps to transmit signals at 10Kbps. Its is specially designed in such a way that I contains photo diode receiving signals from light source although in some case cell phone camera or digital camera will b sufficient 9. How Li-Fi Works ? Operational procedure is very simple If the LED is ON, you transmit a digital 1s If its OFF you transmit a 0s. The LEDs can be switched ON and OFF very quickly, which gives nice opportunities for transmitting data. 10. Data Transmissions By Infrared beam 11. CONSTRUCTION AND WORKING OF Li-Fi 12. Transmitting Element ( led ) 13. Receiving Elements (AVALANCHE PHOTO DIODE) 14. Li-Fi vs Other wireless technologies: Technology Speed Data density Wireless (current) Wi-Fi IEEE 802.11n 150 Mbps * Bluetooth 3 Mbps * IrDA 4 Mbps *** Wireless (future) WiGig 2 Gbps ** Giga-IR 1 Gbps *** Li-Fi >10 Gbps **** 15. Li-Fi vs Wi-Fi: 16. Advantages and Applications 17. Limitation and challenges Light can't pass through objects . Interferences from external light sources like sun light, normal bulbs, and opaque materials in the path of transmission will cause interruption in the communication. High installation cost of the VLC systems . A major challenge facing Li-Fi is how the receiving device will transmit back to transmitter. Li-Fi requires line of sight. 18. Conclusion Immense advancements in science has given a great base to develop such a technology which could rule the communication in future of the coming years The Li- Fi changes the worlds communication and every path of transformation to a very speedy, accessible, easy, safe transformation based provision All we need to do is fit microchip to potential illumination device which does Illumination and wireless data transformation simultaneously Future would project 14 Billion lifi transmitters/access points as they would flourish the planets usage in excess availability Li-Fi overcomes problems in issues like Capability Efficiency Availability Security & safety Lifi is the technology which is for a Cleaner, Greener & Brighter future of planet 19. References [1] http://www.electronicsforu.com/electronicsforu/cir cutarchives/view_article.asp?sno=778&title%20=%20Li Fi%3A+A+New+Paradigm+in+Wireless+Communication&b _type=new&id=12042 [2]. http://en.wikipedia.org/wiki/Li-Fi [3]. International Journal of advances in computing & communications, vol 1, 2013,page no-12 www.ijacc.org [4]. YouTube.com 20. ..Thank You.. Any Queries ??