ppt for li-fi tech

1. Marshall ECE-B
1
By
Marshall
ECE
Srinivas College
mangalore

2. Marshall ECE-B 2
• PRESENT SCENARIO OF WirelessComunicaion
• ISSSUES WITH RADIO FREQUENCY SPECTRUM
• COMPARING THE EM SPECTRUM
• CONSTUCTION AND WORKING OF LI-FI
• OVERCOMING THE ISSUES
• ADVANTAGES
• LIMITATIONS
• APPLICATIONS
• CONCLUTION

3. Marshall ECE-B 3
 We have 1.4 million cellular base stations deployed
 We also have 5 billion of mobile phones
 Mobile phones transmit 600TB of data every month
 Presently Wifi uses radio waves for communication

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 We transmit wireless data through radio waves.
 Radio waves are limited.
 Radio waves are scarce and expensive.
 We only have certain range of it.
 With advent of new technologies like 3G, 4G we
are running out of spectrum.

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COMPARING THE SPECTRUM

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 There are 1.4 million cellular radio base stations.
 They consume massive amount of energy.
 Most of this energy is not used for transmission
but for cooling down the base stations.
 Efficiency of such a base station is only 5% and
that rise a big problem.
EFFICIENCY

8.  Availability of radio waves or RF signals causes
another concern.
 We have to switch off mobile phones in airplanes.
 Radio waves cannot be used under water
 It is not advisable to use mobiles at places like
petrochemical plants and petrol pumps, nuclear
power plant etc.
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AVAILABILITY

9.  Radio waves penetrates through walls.
 They can be intercepted.
 If someone has a knowledge and bad
intentions then he may misuse it.
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SECURITY

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What is Li-Fi / VLC ?
Use of the visible light portion of
the electromagnetic spectrum for data
transmission.
LED light bulbs are turned into high
speed wireless communication devices,
somewhat like a Wi-Fi, hence the name
Li-Fi
(VLC=Visible light Communication)

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Construction and working

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1. CAPACITY
 10,000 TIMES MORE SPECTRUM THAN
RW.
 LIGHT DEVICES ARE ALREADY PRESENT,
SO INFRASTRUCTURE IS AVAILABLE
ALREADY AND INSTALLED.
2. EFFICIENCY
 HIGHLY EFFICIENT BECAUSE LED
CONSUMES LESS ENERGY.

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3. AVAILABLITY
 LIGHT IS PRESENT EVERYWHERE.
 CAN BE USED UNDERWATER ALSO.
4. SECURITY
 LIGHT WAVES DOESNOT PENETRATE
THROUGH WALLS.
 HENCE THEY CAN’T BE INTERCEPTED.

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 WE CAN USE LI-FI IN HOSPITALS AND
AIRCRFTS ALSO.
 CHEAPER THEN WIFI , SINCE VISIBLE
LIGHT SPECTRUM IS A FREE SPECTRUM
BAND.
 LED CONSUMES LESS ENERGY
 THOUSANDS AND MILLIONS OF STREET
LAMPS CAN BE COVERTED TO LI-FI
SPOTS.

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 There should be line of sight between sender
and receiver
 Visible light cannot penetrate through solid
objects
 Interference with other electromagnetic waves
makes the transmitting data to distort
 Light cannot approach the range and
penetration of radio waves
 High installation cost of the VLC system.

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• AIRLINES
• TRAFFIC LIGHTS
• MEDICAL ASPECTS
• SMART MUSEUMS
• SMARTER POWER PLANTS
• ON OCEAN BED

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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 Wi-Fi
hotspot to transmit wireless data and we will
proceed onwards for a..
Cleaner, Greener, Safer and Brighter future.

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