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LI-FI.."for better smarter and brighter future"
- 1. LIGHT FIDELITY (LI-FI) Rishabh Gupta 208116004 M.Tech, Comm. Systems 1 Guided by- Dr. D. Sriram Kumar Associate Professor NIT Trichy
- 2. Contents • What is lifi?? • History • How it works? • Why lifi?? • Architecture • Commercialization • Standards • LiFi Misconceptions • Applications • Li-fi v/s Wi-fi • References 09-08-2017 2
- 3. • LI-FI is transmission of data through illumination, sending data through a LED light bulb that varies intensity faster than human eye can follow What is li-fi?
- 4. 09-08-2017 4
- 5. History 09-08-2017 5 Harald Haas • The technology truly began 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 communication
- 6. 09-08-2017 6 continue….. • VLC technology was exhibited in 2012 using Li-Fi. • By August 2013, data rates of over 1.6 Gbit/s were demonstrated over a single color LED. • In September 2013, a press release said that Li-Fi, or VLC systems in general, do not require line-of-sight conditions.In October 2013, it was reported Chinese manufacturers were working on Li-Fi development kits. • In April 2014, the Russian company Stins Coman announced the development of a Li-Fi wireless local network called BeamCaster. Their current module transfers data at 1.25 GB/s but they foresee boosting speeds up to 5 GB/s in the near future. • In the same year a new record was established by Sisoft (a Mexican company) that was able to transfer data at speeds of up to 10 GBit/s across a light spectrum emitted by LED lamps. • In July 2015, IEEE has operated the APD in Geiger-mode as a single photon avalanche diode (SPAD) to increase the efficiency of energy-usage and makes the receiver more sensitive.
- 7. Issues 09-08-2017 7 1. Capacity 2. Efficiency 3. Availibility 4. Security
- 8. Why Li-fi….??? • Speed • Security • Energy efficient • Safety – an alternative to radio waves, with potentially harmful effects • Data Density • Localization 09-08-2017 8
- 9. Li-fi Products 1st Li-fi Dongle 09-08-2017 9 1st Li-fi device ever
- 12. Li-Fi Misconception….. LiFi is a line-of-sight technology LiFi does not work in sunlight conditions Lights cannot be dimmed LiFi is for downlink only 09-08-2017 12
- 13. 09-08-2017 13 Li-Fi Demonstration For he First Time.!!
- 14. • Single-Carrier Modulation (SCM) • OOK, PPM and PAM • Multi-Carrier Modulation • Aco OFDM, OFDM, flip OFDM • LiFi Specific Modulation scheme outlined in IEEE802.15.7 where signals are encoded into colour intensitie semitted by red, green and blue (RGB) LEDs. • In CSK, incoming bits are mapped on to the instantaneous chromati cities of the coloured LEDs while maintaining a constant average perceived colour. • no flicker effect over all frequencies. • the constant luminous flux implies a nearly constant LED driving current which reduces the possible in rush current at signal modulation, and thus improves LED reliability. Modulation Techniques For Li-fi…..??? 09-08-2017 14
- 15. 09-08-2017 15 Standards • Like Wi-Fi, Li-Fi is wireless and uses similar 802.15.7 protocols. • the IEEE 802.15.7 standard is out-of- date, it fails to consider the latest technological developments in the field of optical wireless communications, specifically with the introduction of O- OFDM. • Nonetheless, the IEEE 802.15.7 standard defines the physical layer (PHY) and media access control (MAC) layer.
- 16. Standards • Physical layer houses light transceiver. • MAC layer provides channel access for all types of data and control message transmissions. • Upper layer consists of network layer and application layer. Network layer takes care of providing network configuration, network manipulation, message routing etc. • Application layer takes care of providing intended functionality as needed by the VPAN or LiFi device. • DME (Device Management Entity) is also supported by LiFi or VPAN network architecture. It makes interfacing between dimmer and PHY/MAC a reality. 09-08-2017 16
- 17. Market Penetration of Li-fi…..??? • Li-Fi is a disruptive technology which will shift business models, creates opportunities ripe for exploitation, and is on track to become a $113bn industry by 2022. • A number of companies offer uni- directional VLC products, which is not the same as Li-Fi - a term defined by the IEEE 802.15.7r1 standardization committee. 09-08-2017 17
- 18. Problem Issues in Li-fi…..??? 09-08-2017 18 Connectivity while moving Multiuser support Dimming Shadowing
- 22. To Explore The Sea 09-08-2017 22
- 23. In R.F Restricted Environments 09-08-2017 23
- 25. In vehicles and traffic lights, reducing accidents and traffic congestion 09-08-2017 25
- 27. Future scopes….. 09-08-2017 27 • Internet-of-Things (IoT) • 5th generation of cellular systems (5G) and beyond • car-to-car communication • In R.F restricted environment • Solar li-fi • Lightning pole as a hotspot
- 28. https://en.wikipedia.org/wiki/Li-Fi http://purelifi.com https://www.youtube.com/ H. Haas. (2011, Aug.).Wireless data from every light bulb. TEDWebsite.[Online] S. Dimitrov, H. Haas, Principles of LED Light Communications: Towards Networked Li-Fi, Cambridge, U.K.:Cambridge Univ. Press, Mar. 2015. Harald Haas, LiFi: Conceptions, Misconceptions and Opportunities Sihua Shao, Abdallah Khreishah (2015), ‘Design of a visible light communication enhanced WiFi system’, IEEE 10 mar 2015 References 09-08-2017 28
- 29. 09-08-2017 29