4. INTRODUCTION
A light based wireless communication
technology known as Li-Fi
LI-FI Light Fidelity.
According to the developer
--Dr. Harald Haas
-- LI-FI is the transmission of data through
illumination, sending data through LED bulb
that varies in intensity faster than human eye
can follow.
only visible light is used.
5.
6. •The LI FI product consist of four sub assemblies.
1. A high bright whiteness LED.
2. RF power amplifier(PA).
3. Printed Circuit Board(PCB).
4. Enclosure.
LI FI ROUTER
Serves as a connector to external link like DSL.
Covers a radius about 20 m.
The transmission speed is 100 Mbps.
Suitable for small office or home use.
CONSTRUCTION
11. Street lamps as free access points.
Smarter power plants.
Airlines
On ocean beds.
AAPLICATIONS
12. Free access points
There are millions of street lamps deployed around the world,
each of these can be a free access point.
13. In Power plants
It can be used in the environments where RF
cannot be used due to safety reasons
(e.g petro chemical plants, nuclear power plants).
15. ON OCEAN BEDS
LI-FI can work under water where fails completely
thus throwing open endless opportunities for
military and navigation operations.
16. Light cannot pass through objects. Hence , range is short.
interferences from external light sources, like sunlight, normal
bulbs and opaque materials in the path of transmission will cause
interruption in the communication.
High installation cost of theVLC systems.
A major challenge facing LI-FI is how the device will transmit back
to transmitter.
LIMITATIONS
17. In order to thrive in a market of wireless technology, LI-FI system have to
meet following criteria .
it must meet criteria of 3I
Low Interference
Low Power
Low Maintenance
It must also have 3H
High reliability
High affordability
High data rate
CHALLENGES
