1. vasusinfotech@gmail.com (+919036595029)Submitted by M. Sreenivas (CSE10090)Submitted to G RADHAKRISHNAN Assistant Professor N. RAKESH Assistant Professor

2. Introduction to Li-Fi Wireless communication through Light illumination 3. History of Li-Fi The technology trulybegan 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 communicationHarald Haas 4. Present Wireless Communication Radio spectrum 1.4 Million base stations, 5 billion Mobile stations 600tb data every month 5. Wireless Communication, a utility Personal life Business life Hospitals Research and development Security 6. Issues regarding Radiospectrum 7. Capacity Radiowaves Cost and Expensive Less Bandwidth compared to other spectrums Insufficient spectrum for increasing dataEfficiency Millions of basestations consume huge amount of energy for 1.Transmitting the radio waves 2.To cool the base station cabins 5% Efficiency 8. Availability Available within the range of Base stations Limited availabity Unavailable in aircraftsSecurity: Less secure(passes through the walls) 9. WHAT IS Li Fi ? Li-Fi is transmission of data throughillumination, sending data through a LED light bulb that varies in intensity faster than human eye can follow 10. How Li-Fi? Normal light power is replaced by LED light power The LED bulb will hold a micro-chip that will do the jobof processing the data. The light intensity can be manipulated to send data by tiny changes in amplitude Properties of LED: (Fundamental property of LI-FI) 1.Intensity can be modulated into very high speeds and varying amplitudes 2.LED can be switched on and off with very high speed 11. Transmitting element LED Fluorescent Lamp 12. Receiving element (Detector) Avalanche Photo Diode Image Sensors 13. Block DiagramDataModulation (PPM/FSK)Light SourceDataDemodulation (PPM/FSK)Photo Detector 14. LI-FI Data transmission 15. Advantages Largers bandwidth (10,000 times the radio bandwidth) High efficiency More availability Highly secure 16. DISADVANTAGE Connectivity while moving Multiuser support Dimming Shadowing 17. APPLICATIONS 18. In RF restricted Environments 19. Hospitals(In few medical instruments) 20. In vehicles and traffic lights,reducing accidents and traffic congestion 21. Street lamps(as free access points) 22. In Aircraft cabins 23. Conclusion Overcomes the limitations of radio spectrum High speed of 10 Gbps can be achieved Lifi can solve the foressential problems of wireless communications these days Enable ever smaller cells without the need