It is a presentation on LiFi technology which is an new high tech alternate for WiFi. It is still in developing stage but the idea was neat and worth knowing.

1. Li-Fi

2. An Overview of Li-Fi
Technology and its Benefits
The Li-Fi (light fidelity) technology
was proposed by the German Scientist
namely Harald Haas. The main function
of this technology is to transmit the
data via light. This technology is idyllic
for high-speed wireless communication in
a restricted region, and it offers many
benefits over Wi-Fi technology such as
high bandwidth, ease of use, efficiency,
and safety.

3. These systems can communicate from
street lights to auto-piloted cars using
their headlights. As the light speed is
superior hence the data communication
speed is also faster in the existing
system. Furthermore, this technology
can be implemented for speedy data
access for the laptops, and gadgets that
will be transmitted during the beam in a
room.

4. What is LiFi Technology?
Li-Fi-light fidelity is similar to Wi-
Fi technology and it is one of the future
wireless communication technologies. The
main feature of this technology includes
fully networked, bidirectional and high-
speed wireless. Nowadays, the most
trending domain in wireless
communication is Wi-Fi and internet
users are also being increased every year.
For obtaining better speed, efficiency,
bandwidth, Li-Fi technology has evolved.

5. The data transmission in this technology
can be done using light because the light
intensity changes quicker than the human
eye for capturing. The range of data
transmission in L-Fi is faster 100 times
than Wi-Fi.

6. Block Diagram of LiFi
Technology
Li-Fi system mainly includes two
parts namely the transmitter and receiver.
The input signal at the transmitter section
can be modulated with a specific time
period then send the data using LED bulbs
in 0’s and 1’s form. Here, the flashes of
LED bulbs are denoted with 0’s and 1’s. At
the receiver end, a photodiode is used to
receive the LED flashes strengthens the
signal & gives the output.

7. The block diagram of Li-Fi system
is shown below, and the transmitter
section includes the input, timer circuit,
an LED bulb. The input of the
transmitter can be any kind of data like
text, voice, etc. The timer circuit in
this section is used to provide the
necessary time intervals among every bit,
and these are transmitted to the
receiver end in the form of LED flashes.

8. The receiver section includes photodiode
as well as amplifier. Here, photodiode
receives the LED bulb flashes then
changes the flashes into electrical signals.
Finally, the amplifier receives the signals
from the photodiode and amplifies to
provide the output.

9. How Li-Fi Works?
Li-Fi is a VLC (visible light
communications) system and the speed
of this system is very high. Li-Fi uses
normal LEDs to allow the data to
transfer and increase the speed up to
224 Gigabits/sec. The data transmission
of this technology can be done via
illumination. The essential devices of this
system are the bright light emitting
diodes.

10. The ON/Off activity of LEDs
permits a type of data transmission in
the form of binary codes but the human
eye cannot recognize this transform &
the bulbs appear with a stable intensity.

11. Differences between Li-Fi &
Wi-Fi
The differences between Li-Fi and Wi-Fi
include the following:
• The Bandwidth Expansion of Wi-Fi
technology is limited and exceptional
for Li-Fi
• The speed of the Wi-Fi is 150 Mbps
and >10 Gbps for Li-Fi
• The security of Wi-Fi is medium and
excellent for Li-Fi

12. • The Data Density of Wi-Fi technology
is low and high for Li-Fi
• The range of Wi-Fi is medium and low
for Li-Fi
• The power availability of Wi-Fi is low
and high for Li-Fi
• The ecological impact of Wi-Fi is
medium and low for Li-Fi
• The cost of the Wi-Fi is medium and
low for Li-Fi

13. Disadvantages of Li-Fi
• Apart from several benefits, the Li-Fi
technology is facing several problems. It
requires LOS (line of sight), as well as
the receiver, would not be a move in
inside.
• The main problem is how the receiver
will send the data back to the
transmitter section.

14. • Another disadvantage of this
technology is an interference of
exterior light sources such as normal
bulbs; sunlight in the lane of
communication will cause intermission
in the transmission.
• It doesn’t work in the dim areas.