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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God said, “Let there be light,” and there was
light. God saw that the light was good
Genesis-1

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What are the basic needs of
an Human Being TODAY?

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● The wireless communication is under great
trouble today.
● RF communication system has many
problems

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Electro-Magnetic Spectrum

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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.

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Security Issues Of Wi-Fi

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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 .

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Health Issues

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WHO CAN REPLACE
RADIO WAVES FOR WIRELESS
COMMUNICATION ?

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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

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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

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Li-Fi system

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SPAD (single photon avalanche diode) GaN micro LED
Switching time is in pS switching time is pS range

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Li-Fi products

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Li-Fi enabled office

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Potential Application Area
IN AIRCRAFT CABIN
IN PETROCHEMICAL
INDUSTRIES

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IN HOSPITALS
IN TRAFFIC

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Incorporation of LIFI Sensors
in Light
Posts
Li-Fi in office

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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

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THANK YOU
A presentation by
MUHAMMED ROSHAN P
S7 B