Transcript Ala Al-Deen

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 Concept
 How
to work ?
 Wi-Fi vs Li-Fi
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 Li-Fi
(Light Fidelity)
 Is Transmission of data through illumination ,
sending data through LED light bulb that
varies intensity faster than human eye can
follow.
 Li-Fi
would use transceiver-fitted LED lamps
that can light a room as well as transmit and
receive information.
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 On
one end all the data on the internet will be
streamed to a lamp driver when the LED is
turned on the microchip converts the digital
data from light.
A
light sensitive device (photo detector)
receives the signal and converts it back into
original data . this method of using rapid
pulses of light to transmit information
wirelessly is technically referred as Visible
Light Communication.
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 LED
can be switched on and off faster since
operating speed of led is less than 1µs, Than the
human eye can detect causing the light source to
be appear continuously.
 This
invisible on-off activity enables a kind of
data transmission using binary codes. Switching
on and LED is a logical '1' , switching it off is a
logical '0'. It is possible to encode data in the
light by varying the rate at which LED's flicker on
and off to give different strings of 1s and 0s.
 Modulation is so fast than eye doesn't notice.
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parameter
Li-Fi
Wi-Fi
Speed
> 1GB/S
around 150 Mb/s
Medium of data
transfer
Use light as carrier
Use radio spectrum
Security
More
Less than Li-Fi
Spread
Doesn’t Permeation
through the wall
Permeation through
the wall
Cost
Cheaper
Expensive
Network topology
Point to point
Point to point
Operating frequency
Hundreds of Tera Hz
2.4 GHz
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THANK YOU
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