li fi technology
DESCRIPTION
A keen and broad explanation on LI-FI technologyTRANSCRIPT
![Page 1: Li fi technology](https://reader034.vdocuments.us/reader034/viewer/2022051112/559be09e1a28ab44568b46eb/html5/thumbnails/1.jpg)
technologyHigh speed bidirectional fully
networked wireless communication.
Project submitted by:
Vinay Kumar Gattu.
KNRR(ECE)
![Page 2: Li fi technology](https://reader034.vdocuments.us/reader034/viewer/2022051112/559be09e1a28ab44568b46eb/html5/thumbnails/2.jpg)
Introduction:
LI-FI is a technology that uses the light emitting diodes to transmit the data wirelessly.
LI-FI is fast and cheap optical version of Wi-Fi ,based on visible light communication(VLC).
VLC is a data communication medium, which uses the visible light between 400 THz (780 nm) and 800 THz (375 nm) as optical carrier for data transmission.
![Page 3: Li fi technology](https://reader034.vdocuments.us/reader034/viewer/2022051112/559be09e1a28ab44568b46eb/html5/thumbnails/3.jpg)
By this technology the led bulb having power of
one watt will distribute internet to four systems
at a time.
The led bulbs having microchips will transmit
internet with speed of 150mbps.
![Page 4: Li fi technology](https://reader034.vdocuments.us/reader034/viewer/2022051112/559be09e1a28ab44568b46eb/html5/thumbnails/4.jpg)
Diagrammatic representation of li-fi
![Page 5: Li fi technology](https://reader034.vdocuments.us/reader034/viewer/2022051112/559be09e1a28ab44568b46eb/html5/thumbnails/5.jpg)
LI-FI Environment:
![Page 6: Li fi technology](https://reader034.vdocuments.us/reader034/viewer/2022051112/559be09e1a28ab44568b46eb/html5/thumbnails/6.jpg)
WHO INVENTED IT ?
This technology was invented by German physicist
HARALD HAAS , from the University of Edinburgh.
He demonstrated it in the year 2012.
![Page 7: Li fi technology](https://reader034.vdocuments.us/reader034/viewer/2022051112/559be09e1a28ab44568b46eb/html5/thumbnails/7.jpg)
How LI-FI works:
![Page 8: Li fi technology](https://reader034.vdocuments.us/reader034/viewer/2022051112/559be09e1a28ab44568b46eb/html5/thumbnails/8.jpg)
The heart of this technology is a new generation high
brightness LED’S.
These LED’S varies in intensity (that is gets on and
off) so fast that a human eye cannot detect it.
If LED is ON , then we transmit logic 1, and if LED is
OFF , then we transmit logic 0.
A controller is connected at the back side of these
LED bulbs to code data to these LED’S.
![Page 9: Li fi technology](https://reader034.vdocuments.us/reader034/viewer/2022051112/559be09e1a28ab44568b46eb/html5/thumbnails/9.jpg)
LI-FI Equipment
![Page 10: Li fi technology](https://reader034.vdocuments.us/reader034/viewer/2022051112/559be09e1a28ab44568b46eb/html5/thumbnails/10.jpg)
LI-FI VS WI-FI
LI-FI has a High speed
data transfer rate over
1gbps.
Wi-Fi has a data
transfer rate of
maximum 54
mbps.
DATA TRANSFER
SPEED
• Why so much difference?
![Page 11: Li fi technology](https://reader034.vdocuments.us/reader034/viewer/2022051112/559be09e1a28ab44568b46eb/html5/thumbnails/11.jpg)
• LI-FI has an upper hand due to parallel data
transmission.
![Page 12: Li fi technology](https://reader034.vdocuments.us/reader034/viewer/2022051112/559be09e1a28ab44568b46eb/html5/thumbnails/12.jpg)
Part of EM spectrum they use
LI-FI
LI-FI uses the visible light portion of the EM spectrum.
WI-FI
Wi-Fi use the
radio wave portion
of EM spectrum
![Page 13: Li fi technology](https://reader034.vdocuments.us/reader034/viewer/2022051112/559be09e1a28ab44568b46eb/html5/thumbnails/13.jpg)
Issues with radio wave:
Capacity
• With advent of new technologies like 3G, 4G we are
running out of spectrum.
• This is because radio waves are now becoming
expensive.
![Page 14: Li fi technology](https://reader034.vdocuments.us/reader034/viewer/2022051112/559be09e1a28ab44568b46eb/html5/thumbnails/14.jpg)
Efficiency
There are 1.4 million cellular radio base stations.
Efficiency of each base station is just 5%.
Most of the energy is not used for transmission
but rather for cooling down the base station.
![Page 15: Li fi technology](https://reader034.vdocuments.us/reader034/viewer/2022051112/559be09e1a28ab44568b46eb/html5/thumbnails/15.jpg)
Security
• Radio waves can penetrate through walls
and hence can be intercepted.
• Any one with skills of hacking may misuse
it.
Availability
• We have to switch off mobiles in aircrafts.
• It is not advisable to use mobiles at petrol
bunks.
![Page 16: Li fi technology](https://reader034.vdocuments.us/reader034/viewer/2022051112/559be09e1a28ab44568b46eb/html5/thumbnails/16.jpg)
ALTERNATIVE OF RADIO WAVES
CAN IT BE INFRARED WAVES ?
Ir Waves Are Harmful For Our Eyes
Hence Used At Very Low Power
![Page 17: Li fi technology](https://reader034.vdocuments.us/reader034/viewer/2022051112/559be09e1a28ab44568b46eb/html5/thumbnails/17.jpg)
CAN IT BE UV RAYS?
• UV rays are harmful for our skin and cannot be used
for long duration.
CAN IT BE GAMMA RAYS ?
Gamma Rays Are Radioactive And Are
Dangerous.
CAN IT BE X-RAYS ? NO
SO WE ARE LEFT ONLY WITH VISIBLE
LIGHT SPECTRUM.
![Page 18: Li fi technology](https://reader034.vdocuments.us/reader034/viewer/2022051112/559be09e1a28ab44568b46eb/html5/thumbnails/18.jpg)
Advantages of li-fi which are limitations to
RW
CAPACITY
• 10000 Times More Spectrum Than Rw.
• Light Boxes Are Already Present, So
Infrastructure Is Available Already And
Installed.
EFFICIENCY
Highly Efficient Because Led Consumes
Less Energy.
![Page 19: Li fi technology](https://reader034.vdocuments.us/reader034/viewer/2022051112/559be09e1a28ab44568b46eb/html5/thumbnails/19.jpg)
AVAILABLITY
• Light Is Present Everywhere.
• Data is present where light is present.
SECURITY
• Light Waves Does not Penetrate
Through Walls.
• Hence they can’t be intercepted.
![Page 20: Li fi technology](https://reader034.vdocuments.us/reader034/viewer/2022051112/559be09e1a28ab44568b46eb/html5/thumbnails/20.jpg)
Advantages of LI-FI
• You Can Use Li-fi In Hospitals And Aircrafts Also.
• Cheaper Then Wi-Fi , Since Visible Light Spectrum Is
A Free Spectrum Band.
• No License Needed.
• Thousands And Millions Of Street Lamps Can Be
Converted To Li-fi Hotspots.
![Page 21: Li fi technology](https://reader034.vdocuments.us/reader034/viewer/2022051112/559be09e1a28ab44568b46eb/html5/thumbnails/21.jpg)
IS THIS A PROVEN TECHNOLOGY ?
Yes This Already Proven.
HARALD HAAS DEMONSTRATED HIS INVENTION
USING AN ORDINARY TABLE LAMP THAT
SUCCESSFULLY TRANSMITTED DATA AT SPEEDS
EXCEEDING 10mbps USING LIGHT WAVES FORM LED
LIGHT BULBS TO A COMPUTER LOCATED BELOW THE
LAMP. To Prove That The Light Was The Source Of
The Data Stream He Periodically Blocked The Beam
Of Light , Causing The Connection To Drop.
![Page 22: Li fi technology](https://reader034.vdocuments.us/reader034/viewer/2022051112/559be09e1a28ab44568b46eb/html5/thumbnails/22.jpg)