1. Implemented Systems
There is a number of
implemented systems and projects which uses Li-Fi technology and provides
reliable and new applications and uses for this technology. Some of these are:
PureLiFi, the home of
Li-Fi, is recognised as the leader in the field – the usage of the visible
light spectrum instead of radio frequencies to enable wireless data
communication. PureLiFi provides high-speed wireless access that offers
substantially greater security, safety and data densities than Wi-Fi along with
inherent properties that eliminate unwanted external network intrusion. In
addition, the integration of illumination and data services generates a
measurable reduction in both infrastructure complexity and energy consumption.The management Team of this company say: “At pureLiFi, we aim to
address and optimally exploit the opportunities presented by this disruptive
technology in conjunction with our Li-Fi ecosystem partners.” Some Products of
this company:
a.
Li-1st
The
Li-1st provides the first major opportunity for customers to rapidly develop
and test VLC applications for cost-effective, high-speed data communication
solutions that utilize commercial LED infrastructures.
The
product offers full duplex communication with a capacity of 5Mbps in both the
downlink and uplink over a range of up to three metres, while simultaneously
providing ample desk space illumination. The distance achieved by the system
depends only on the strength of the light source, i.e., the LED light. Li-1st
offers a simple plug-and-play solution for secure wireless point-to-point Internet
access with a wide range of LED luminaires working seamlessly with large
600×600 panels. Actually,
the Li-1st is a largely LED luminaire agnostic, providing a diverse tool for
deploying and exploiting the shifting, services based, business model of the
lighting industry. The system has been available on limited release since
January 2014.
b.
Li-Flame
The Li-Flame is the
next generation of the world‟s first high-speed wireless network solution using
VLC. Li-Flame delivers:
An extensive range of wireless communication applications
including and beyond existing Wi-Fi.
A cost-effective delivery of light and data via a single
infrastructure.
More flexible
construction environments with the elimination of communication cabling.
The Li-Flame was
publicly demonstrated at Mobile World Congress in Barcelona on 2 – 5 March at
the Scottish Development International stand.
The main products for
this project are:
Ø Li-Flame
Ceiling Unit (CU)
It has some main
advantages which is Data and power via standard Ethernet port, Simple
installation, Multiple access; and Handover control enables seamless switching
between Access points (APs).
ØLi-Flame
Desktop Unit (DU):
This
device also has some excellent advantages, Connects to client device via USB,
10Mbps infrared uplink to ceiling unit, Handover allowing user to move from one
AP to the next without losing the high-speed data connection, Transceiver
swivel head can be adjusted by user to optimise the connection; and
Battery-powered and portable.
II.
UP-VLC Project
Ultra-parallel visible light
communications or (UP-VLC) project is a partnership between 6 research groups
at 5 institutions. It is led by Professor M.D. Dawson.Some of
the relevant technical expertise and background accomplishments brought by the
partners of this project are illustrated.
The project Running
from October 2012 to September 2016, UP-VLC is an ambitious EPSRC-funded £4.6
million Programme Grant which will explore the transformative technology of
communications in an imaginative and foresighted way. The vision is built on
the unique capabilities of gallium nitride (GaN) optoelectronics to combine
optical communications with lighting functions and especially on the capability
to implement new forms of spatial multiplexing, where individual elements in
high-density arrays of GaN based LEDs provide independent communications
channels, but can combine as displays. The engineers who work on this project
say: “We envisage ultra-high data density - potentially Tb/s/mm2 - arrays of
LEDs driven via CMOS control electronics in novel addressing and encoding schemes
and in compact and versatile forms".
Recently,
by integrating CMOS electronics with GAN based micro-LEDs, they have developed
CMOS-controlled color-tunable smart displays. The color-tunable LED pixels in
these displays have a modulation bandwidth of 100 MHz, thus providing
simultaneously a wavelength-agile source for high-speed visible light
communications.
When light
is cast onto a surface, some of it will be absorbed and some reflected,
depending on the reflectivity of that surface. The signal encoded in the
respective RGB wavelengths will wind up being weakened by that partial
absorption, and since this technology uses an image captured by a camera to
measure the reflectivity and compensate accordingly, information-capturing
accuracy has been improved, this issue is called reflectance compensation.
NEXT COMING:::CHALLENGES,LI-FI VERSUS WI-FI,CONCLUSION
