Li-Fi LIGHT FIDEALITY

Anees Ahmed 11cs21@quest.edu.pk

HOW WE ARE CONNECTED TO INTERNET Wired•Dial-up •DSLWireless•Broadband (evo)•Satellite•Wi-Fi

PRESENT SCENARIO

1.4 Million 5 Billion

ISSUES REGARDING RADIO SPECTRUM

WHO CAN REPLACE RADIO WAVES FOR WIRLES COMMUNICATION ?

WHAT IS LI – FI ?•transmission of data through illumination •LED light bulb

HISTROY

• The technology began during the 1990‘s.

•   Coined by Edinburgh University's Prof Harald Haas.

HARALD HASS

WORKING PRINCIPLE

• LED switch on/off• Require LED and controller to code data into LED.

WORKING PRINCIPLE

Radio Waves

Infrared Rays

Visible

Rays

Ultraviolet Ray

s

X- Rays

Gama Rays

HENCE WE LEFT WITH THE ONLY THE VISIBLE - LIGHT SPECTRUM.

WHY VLC ONLY ?

LI-FI•Light power(LED)•Multiple data stream•High speed•Technologies used in LI-FI: SIM-OFDM and Spatial modulation

LI-FI

DIFFERNCE BETWEEN TECHNOLOGIES

POTENTIAL APPLICATION OF LI-FI

TRAFFIC LIGHTS

INTRINSICALLY SAFE ENVIRONMENTS

POTENTIAL APPLICATION OF LI-FI

PUBLIC INTERNET HOTSPOTS

POTENTIAL APPLICATION OF LI-FI

ON OCEAN BEDS

POTENTIAL APPLICATION OF LI-FI

ADVANTAGES

• Larger bandwidth (10,000 times the radio bandwidth)

• High efficiency• More availability• Highly secure

DISADVANTAGE

• Presence of Light is essential

CONCLUSION

The possibilities are numerous and can be explored further. If this technology can be put into practical use , every bulb can be used something like a Wi-Fi hotspots to transmit wireless data.

REFERENCES:• [1] anyfi.net/documentation

• [2] www.independent.co.uk/news/science/lifi-revolution-internet-connections-using-light-bulbs-are-250-times-faster-than-broadband-8909320.htm

• [3] http://www.extremetech.com/extreme/147339-micro-led-lifi-where-every-light-source-in-the-world-is-also-tv-and-provides-gigabit-internet-access

THANK YOUAny Query