“The
wider opportunity is to transform global communications by speeding up the
process of bringing Internet and other data communication functionality to
remote and poorer regions in a way not previously thought achievable due to
lack of infrastructure and investment”
Edinburgh Research
& Innovation’s IP Project Manager, Tom Higgison, speaking on the
developement of Li-Fi by pureLiFi Ltd.
Folks
what faster than Wi-Fi and has more bandwidth. Li-Fi, Wireless Internet based
on Light that what.
Best
of all, there is now a working prototype developed by Professor Harald Haas in
collaboration with the University of Edinburgh’s Li-FI R&D Centre as
reported in the article “The
inventor of light-based ‘Li-Fi’ Internet has completed the first working
prototype”, published November 13, 2015 By Chloe Olewitz, DigitalTrends.
To
get an idea of how revolutionary an idea Li-Fi is, watch this TED Talk Video in
Scotland by Professor Harald Haas back in 2011 that explains the concept of
Li-Fi more clearly.
The
company they've jointly formed, called pureLiFi Ltd, has taken their own sweet
time to develope a Li-Fi Router to transmit and receive Data in much the same
way that Wi-Fi works currently.
This
concept of Li-Fi was very similar to the research being done by EPSRC and
University of Strathclyde as reported in my blog article
entitled “EPSRC
and University of Strathclyde researches FLORA based Li-Fi for developement in
the next four years”.
So
what exactly is Li-Fi and what are the advantages of this new Technology?
pureLiFi Ltd and the
Li-Fi Revolution – 10 Gigabit speeds using unlicensed optical bandwidth
Li-Fi
is basically Wi-Fi transmission using optical frequencies. It involves the use
of LED (Light Emitting Diodes) as spoken of by Professor Harold Haas in his TED
Talk. However the LED Lamp used in his demonstration is modified to also
include a photo receiver for bi-directional transmission of Data.
This
concept of Li-Fi has several advantages over Wi-Fi, mainly in terms of
increased bandwidth:
1.
Use of Visible Light Spectrum for
Communication to ease congestion in the Microwave Band
2.
Quench the demand for VHF (Very High
Frequency) and UHF (Ultra High Frequency) Bands for Broadband by using Optical
Spectrum with its higher bandwidths
3.
Spectrum license free, as it would be
difficult to license Visible Light, the same Visible Light Spectrum used by
Human eyes
4.
Denser packing of the LED with a
thousand (1000) occupying the same space as a single 2mm sized LED, akin to the
packing of LED used in LCD TV’s
5.
Faster switching rates also in the order
of a thousand (1000) times that of a 2 mm LED, thus enable separate channelized
Communications using different light Spectrum
The
Li-Fi would have many LED (Light Emitting Diodes) are densely packed and
pulsing rapidly on an off to transmit data using PCM (Pulse Coded Modulation).
This means you could have three (3) different transmission modes or
configurations of the Li-Fi Router and the Li-Fi Receiver:
1.
Frequency Diversity
2.
Coding Diversity
3.
Space Diversity
These
different modes of transmissions means that you can have multiple PCM channels
transmitting data simultaneously from one light source to multiple receiver and
they'd not interfere.
Frequency
diversity is where Li-Fi receivers used to receive the data and read the data
bytes from the light could be coded to either different frequencies of light
from Red to Violet as well as in potentially in the Infrared, Ultravoilet and
even Gamma Ray and Cosmic Ray spectrum for commercial and Military applications.
Coding
diversity is where they could also use the same spectrum of light but with different
coding for each LED. Finally, Space Diversity would be a situation where the
Li-Fi Router or receiver is set at different physical locations but
transmitting to different individual Li-Fi Receivers.
All
of these three transmission modes make it possible to possible to transmitting at
speeds of 10 gigabits per second using what is effectively free unlicensed
bandwidth. It would still have the same limitations like a regular Router but
with blazing speeds.
As
Professor Harold Haas points out, LI-FI can potentially be used to replace
cellular base stations as it is more efficient way to transmit wireless data.
This is not only in terms of spectral efficiency but also in terms of power consumption,
as such as Li-Fi Base station would have to be solar powered.
Smartphones,
Tablets and even HDTV could be modified with Li-Fi Routers to enable the
streaming of gigabits of Data to these devices as demonstrated by Philips
Intelligent Lighting System in my blog article
entitled “Philips
Intelligent Lighting System delivers Li-Fi Network Personalized LBS Coupons
using LED Lighting”.
But
what interesting is that the Li-Fi router will fit into the aesthetics of your
home as it can be made to replace the LED Light bulbs in your home. Thus, your
Li-Fi router will look like a light bulb and will transmit data once your
device has LOS (Line of sight) to the light bulb.
pureLiFi Ltd Solar
Powered Li-Fi - Why LiFi is coming with 5G Internet by 2020
pureLiFi
Ltd Li-Fi prototype is based on using Solar Power to power the router. This is
necessary as to process data at Gigabit speeds would require a super fast
processor that would use up a lot of power and get very hot very fast.
The
high switching frequencies, rated in the nanoseconds at which LI-Fi operates
means that the transmission of data would be unnoticed by the persons in the
room. Most conventional LEDS cars
capable of switching on and off at such high frequencies.
This
makes it possible to even use regular LED bulbs such as the US$10 10W GE Bright
Stik as the transmitter of Li-Fi Data as reported in my MICO Wars blog article
entitled “US$10
10W GE Bright Stik is the cheapest 60 W Replacement LED Bulb”.
Higher
frequencies means a higher level of bit errors if there is noise in the Power
sources. Thus there is a need for a stable and ripple-free power source i.e.
solar to power such as a router.
Because
of its High Data rates, it would also potentially be very compatible with 5G Internet
when it comes by 2020 as predicted in my blog article
entitled “ITU
publishes 5G IMT-2020 Roadmap – Why US Telecom Providers, @Digicel_Jamaica and
@LIMEJamaica like to travel off the beaten Path”.
It's
also more secure, being as the data can be used one of or even all three
different transmission modes or configurations to make it difficult for a
hacker to hack such a transmission system. Not only that, the mere fact that
Li-Fi is LOS means that for your pesky neighbor hop onto your bandwidth, they'd
have to be in the same room as you are and also have your login and password
with a compatible Li-Fi Router to access your Data Stream.
Hacking
individual Data form Li-Fi router to device is also difficult, as with higher
bandwidth comes potentially larger, stronger 512 bit and 1024 bit encryption
schemas will be developed that can make
it difficult for hackers to hack into your data stream. Additionally, for
military applications, the use of Ultravoilet and Infrared spectrum can also be
explored instead of using visible light.
Li-Fi
has a bright future as it will most likely find uses in the expansion of IoT (Internet
of Things) devices in the future in the home, in industry as well as in Mobile
devices. If the pureLIFI Ltd standard is adopted by the Telecom Provider,
expect 10 GBps data Li-Fi to be coming to the Apple iPhone before 2020 around
the same time as the launch of 5G Internet.
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