International Journal of Trend in Scientific Research and Development (IJTSRD)
Volume 4 Issue 3, April 2020 Available Online: www.ijtsrd.com e-ISSN: 2456 – 6470
Li-Fi the Technology beyond Wi-Fi
Sadaf Jamil Ahmed Shaikh
Department of MCA, YMT College of Management, Kharghar, Navi Mumbai, Maharashtra, India
How to cite this paper: Sadaf Jamil
Ahmed Shaikh "Li-Fi the Technology
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Wi-Fi"
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ABSTRACT
Today pace of net is an essential multifaceted nature and all individuals be it
undertaking, foundations, enterprises, business visionaries is main thrust for
buying accurate data at the specific time and definite spot. In this era of
advanced science, connection to the internet has become possible through a
wireless connection. This calls for swift net connectivity, generation and an
immense field of channels. As the number of people accessing the wireless
internet increase, the blocked air-waves make it tremendously difficult to
latch on to a reliable signal. To solve this issue, a German Physicist Harald
Haas has introduced a new technology Light Fidelity (LIFI). Taking the fiber
out of fiber optics by sending data through an LED light bulb that varies in
intensity faster than a human eye can recognize. As per his knowledge, this
technology is based on the intensity and potential of the light-emitting diode.
Lifi is used to transfer data through illumination. This paper is focused on Lifi,
its application, features, working of Lifi and its comparison with existing
technologies like Wifi, etc.
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KEYWORDS: Wi-fi, Li-fi, LED, Data Transformation, Visible Light Communication,
photodiode, Radio Spectrum
INTRODUCTION
We all are reliant directly or indirectly on the internet for the
fulfillment of our daily requirements. It is impossible to think
of a day in our life when we are not connected to the
internet. In today’s world, we are sharing lots of data so that
a good quality of data sharing capacity is required.
Professor Harald Haas in 2011 from the University of
Edinburgh in the UK recommended an idea about the new
form of wireless technology which is named “Data through
Illumination”. And to implement this Haas used fiber optics
to send data through an LED light bulb. He used a table lamp
with an LED bulb to send a video of a blooming flower that
was projected on the screen.
The Lifi can be thought of as a light-based Wifi. The
additional frequency band offers by lifi are 400 THz
compared to that available in RF communication which is
about 300 GHz. Lifi also uses the visible spectrum, it will help
to improve concerns that the electromagnetic waves coming
with Wifi could badly affect our health.
computerized as 1 while if it is OFF, the signal transmitted is
a digital 0. We can encode different data and transmit it, by
changing the rate at which LEDs flash.
Working:
The Li-Fi framework comprises two sections, the
transmitter, and the collector. Driven light is utilized as a
sign source between two end frameworks. Information is
conveyed by the adjusted light from the LED. The microchip
unit (MPU) system modulates and demodulates information
at the transmitter and the recipient closes individually. The
transmitter part tweaks the info signal with the necessary
time span and transmits the information as 1's and 0's
utilizing an LED bulb. These 1's and 0's are only the flashes
of the bulb. The recipient part discovers these flashes
utilizing a photodiode and intensifies the sign to deliver the
yield. Li-Fi is actualized utilizing white LED lights at a
downlink transmitter. A variety of LEDs can likewise be
utilized for equal information transmission and diverse
shaded LEDs to modify the LED recurrence so information is
encoded for various recurrence.
Lifi connects to the internet with no wires. In Lifi, we can
connect the internet with the help of an LED beam infinite
range. To make communication between devices, a lifi will
need a transceiver to send and receive the data. This
transceiver will have a technique to make the LED enable to
carry the data using the light called modulation technique.
Lifi refers to a 5G visible light communication system. The
Lifi is a secure data transmission system as the light cannot
be penetrating through the walls. The working of Lifi is very
simple as the driven is ON the sign transmitted is
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In our venture we first believer the information document to
be moved into a twofold stream of 0's and 1's which is taken
care of into the Li-Fi TX equipment which transmits this
information through light. The power of light is tweaked to
accomplish this objective. We set a high edge voltage as on
state and a low edge voltage as off state. At whatever point
the LED is in on state it transmits a 1 and when it is in off
state it transmits a 0. The exchanging transistor is equipped
for flipping the condition of drove in nanoseconds which
speed up transmission somewhat. The Li-Fi RX subsequent
to detecting the twofold stream sends it to the framework
where the first information record is recovered.
Design OF LI-FI
Significant variables we should consider while structuring
Li-Fi as following:
1. The presence of Light should be view.
2. Lamp driver where web association, switch and LED
light associated.
3. For better execution use LED bulbs.
4. A photograph locator got information.
Advantages of Li-Fi:
Li-Fi, which utilizes visible light to transmit signals remotely,
is an emerging technology ready to compete with Wi-Fi.
Additionally, Li-Fi removes the constraints that have been
put on the user by the Radio wave transmission, for example,
Wi-Fi. Advantages points of Li-Fi innovation include:
Efficiency:
Li-Fi deals with visible light technology. Since homes and
workplaces as of now have LED bulbs for lighting purposes, a
similar source of light can be utilized to transmit
information. Thus, it is exceptionally proficient regarding
costs just like energy. The light should be on to transmit
information, so when there is no requirement for light, it
very well may be decreased to a point where it shows up off
to the human eye, yet it is in reality still on and working.
Accessibility:
Wherever there is a light source, there can be the Internet.
Lights are available all over – in homes, workplaces, shops,
shopping centers, and even planes, implying that rapid
information transmission could be accessible all over.
Security:
One fundamental favourable position of Li-Fi is security.
Since light can't go through hazy structures, Li-Fi Internet is
accessible just to the users inside a room and can't be broken
by users in different rooms or structures.
Cost:
Instead of running near a mile worth of link, the LEDpowered Li-Fi association could be utilized to shaft the data
legitimately to the destination. Using a point-to-point exhibit,
places of business can remain associated with one another
without the utilization of extra links being laid starting with
one access point to another.
Li-Fi technology has an incredible breadth in the future:
The broad development in the utilization of LEDs for
brightening, in reality, gives the chance to incorporate the
technology into plenty of environments and applications.
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Challenges faced by Li-Fi:
The Li-Fi based communication system confronted with
various types of difficulties. These difficulties limit its
exhibition and can diminish the general productivity of the
system. A portion of the primary difficulties are given below:
LED light ON-OFF mode Indoor:
Li-Fi based communication framework expects to furnish
brightening with communication, so ON-OFF speed of an
LED assumes a crucial job. For a Li-Fi based framework, it is
constantly necessary to have a Light source in ON condition
yet it starts the main problem of how information
transmission will happen when the LEDs are killed. An
information transmission can, in any case, be conceivable if
the brilliance level of an LED transmitter is low. The
diminishing degree of an LED bulb can be sorted out so that
an ideal information rate can be accomplished utilizing light
power. In crossbreed arrangement, RF or infrared can be
valuable to give correspondence in LED OFF mode however
in Li-Fi based correspondence it is as yet a test to locate a
reasonable arrangement of how correspondence will be
conceivable in any unfortunate circumstance when LEDs are
in its OFF mode.
Receiver Design issues in the case of mobility: Li-Fi
receivers can consist of an optical photograph locator or an
imaging sensor for getting the light emission. The
photodiode is progressively useful for stationary users
because right now FOV can be adjusted effectively to the
LED. The imaging sensor has a relatively bigger FOV so they
can be valuable for gadgets that bolster portability however
imaging sensors are less vitality proficient and produce
delays in information gathering thus can diminish the
general feasible information rate. In this way it is trying to
plan such an optical collector, that can control FOV
misalignment and increment vigor. Thus for both static and
versatility cases, an improvement in optical collector
configuration is expected to guarantee high information
rates alongside power productivity.
Connectivity and Coverage area issues:
A Li-Fi framework needs to keep up continuous and rapid
availability inside an inclusion zone of a Li-Fi cell and
between the Li-Fi cells. So advance plans for interface layer
are required which can keep up rate adjustment and casing
total to adapt up to network issues. In a Li-Fi based system, it
is fundamental that smooth handover of devices just as the
handover of innovation will happen for effective
correspondence in cutting edge Li-Fi based framework.
Li-Fi web availability issues:
For Li-Fi based broadband access arrange, it is basic that
LEDs driving circuits are associated with a web. The expense
of web sending for Li-Fi and the impedance of remote
associations is a constraining component that can decrease
the reachable information rate utilizing the web. Effective
planning methods are required to give alluring web network
speed utilizing LEDs at moderate sending costs. In this
manner, it turns into a moving errand to propose a model
that can give web utilizing Li-Fi to enormous scope
correspondence.
Uplink transmission issues:
A Wireless correspondence arrangement is complete
without the office of uplink correspondence. Li-Fi uplink
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necessitates that transmitter and beneficiary keep up a
directional connection during transmission. It can
fundamentally lessen the general throughput of the system if
the two gadgets are continually moving. So in Li-Fi, it is
additionally a test that how the uplink traffic in a system will
be work. The radio recurrence and infrared can be
considered for transmitting uplink information in Li-Fi
arrange yet at the same time progressively inventive
thoughts are required for explaining the uplink issues in LiFi systems.
Applications of Li-Fi:
The applications for LiFi are boundless. Anyplace there is an
LED light there can be information. LiFi is a platform
technology that will expand the abilities of remote
interchanges to places past even our current conception.
Today there are genuine applications and advantages for
actualizing LiFi. LiFi can empower secure remote
correspondences, network in RF antagonistic conditions, for
example, petrochemical plants and medical clinics. LiFi
additionally gives fast, thick and dependable systems for big
business situations and a pathway to empower brilliant
structures, transport, urban communities, and countries.
Underwater Communications
Utilizing RF signals is illogical because of solid sign
absorption in water. Li-Fi answers short-go interchanges.
Submarines could think carefully to speak with one another,
procedure information independently and send their
discoveries intermittently back to the surface in Underwater
Remotely Operated Vehicles (ROV). Another significant issue
is that Li-Fi can even work submerged where Wi-Fi flops
totally, consequently it's open for military operations.
Traffic Management
Li-Fi can help in dealing with the traffic in a superior way
and the accident numbers can be diminished. Traffic lights
can impart to the vehicle and with one another to deal with
the traffic on the road. A traffic light can assume the job of
the sender of the information to give data to the vehicle on
the status of the street or about the circumstance of different
autos. Additionally, vehicles can speak with one another and
forestall accidents by changing data. For instance, LED
vehicle lights can alarm drivers when different vehicles are
excessively close.
Aviation Routes
We need to turn off mobiles in airplanes to forestall covering
of cell phone signals with route and control signals utilized
via airplane. Li-Fi can be securely utilized on planes since it
doesn't meddle with RF. Since Data is available where light is
available, we can utilize the lights over the seats in the plane
as a hotspot.
such a route framework for the outwardly debilitated as
appeared. Driven lights transmit noticeable light with area
information and an installed framework or cell phone with
an obvious light collector which gets the information. The
inserted framework or cell phone computes the ideal way to
an assignment and addresses the outwardly debilitated
through an earphone.
Literature Review:
The vast majority of the individuals are utilizing Wi-Fi
Internet devices, which will be helpful for 2.4-5GHz RF to
convey remote Internet get to encompassed our home,
workplaces, schools, and some open places too. We are very
reliant upon these about pervasive services [7, 15]. While
Wi-Fi can cover a whole house, school, the data transfer
capacity is constrained to 50-100 megabits for every second
(Mbps). It is the most present Internet administration, yet
deficient for moving huge information records like HDTV
motion pictures, music libraries, and computer games. The
vast majority of the ward upon 'the cloud' or our own 'media
administrations' to store the entirety of our records,
including motion pictures, photographs, sound and video
devices, games, the more and most transmission capacity
and speed ought to be expected to get to this information.
Accordingly, RF-based advances, for example, the present
Wi-Fi are not the ideal way. Likewise, Wi-Fi may not be the
most productive approach to give new wanted abilities, for
example, exactness indoor situating and signal
acknowledgment. The optical remote advances here and
there called obvious light correspondence (VLC), and all the
more as of late alluded to as Li-Fi. Then again, offer a
completely new worldview in remote advancements in the
terms of correspondence speed, ease of use and adaptability,
dependability.
Comparison between Li-Fi and other technology:
The Li-Fi makes the system utilizing the work area
photosensitive component that works pair with unmodified
light installation. The work area photosensitive component
contains infrared LEDs to associate with the uplink channel.
Right now, Fi works with information rate 5Mbps in the
uplink and downlink channels and conceals to three meters
go. Wi-Fi is dealing with radio waves to give remote web and
system associations at fast. At the point when an RF current
is going to a radio wire that makes an electromagnetic field
to engender utilizing the room. Wi-Fi is indicated by the IEEE
802.11x standard. This technology uses the device AP for
broadcasting a sign around the PC devices.
Comparison of speed of various wireless technologies
Technology
Speed
Li-Fi
~1 Gbps
Wi-Fi IEEE 802.11n ~150 Mbps
Clinical Applications
One of the most significant highlights of Li-Fi is that it could
be utilized in emergency clinics and clinical settings that
require the absence of RF signals which influence the clinical
gear. For instance, OTs (Operation theaters) don't permit
utilizing Wi-Fi because of radiation concerns since the use of
Wi-Fi hinders the signs for observing equipment‟s. Along
these lines, it might be hazardous to the patient's wellbeing.
Dazzle Indoor Navigation System
The indoor route is helpful for everybody, and it is
particularly basic for the outwardly hindered. We proposed
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IrDA
~4 Mbps
Bluetooth
~3 Mbps
NFC
~424 Kbps
Future Enhancement:
As light is all over the place and allowed to utilize
possibilities increments, all things considered, of the
utilization of Li-Fi innovation. On the off chance that this
innovation comes to rehearse each lifi bulb will be utilized as
Wi-Fi hotspot to transmit remote information. As the lifi
innovation will be utilized which will prompt a cleaner,
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greener, more secure and splendid future and condition. The
idea of lifi is drawing in numerous individuals as it is allowed
to use with no permit and quicker methods for information
move. The extent of Li-Fi is tremendous. Li-Fi is a rising
innovation and henceforth it has tremendous potential. The
region of Li-Fi is extremely wide in the way of emergency
clinics, scholastics, carriers and that's just the beginning. In
future upgrade all the road lights, even vehicle headlights
can be utilized as a hotspot for Li-Fi associating focuses to
move information with the goal that the web can be gotten to
anyplace. The headway right now a speed of more than
12GBps and can download a HD film in a flash. A compact LiFi can be brought into reality utilizing the said standards,
with which we can transmit and get information at a rapid
rate. This can be utilized in a cell phone which has a photo
detector in it.
Conclusion:
The probabilities are various and hence for the investigation
should be possible. On the off chance that his innovation may
be placed into down to earth use, each bulb can supply
something like a Wi-Fi hotspot to help transmit remote
information and we will continue toward the arrangement,
greener, more secure and better future. The idea of Li-Fi is
presently pulling in loads of intrigue, not least since it might
offer a veritable and furthermore productive choice to radiobased Wi-Fi. As a developing number of people and their
numerous devices get to remote online worlds, the wireless
transmissions have become progressively stopped up,
making it progressively increasingly hard to get a fair, rapid
sign. This may comprehend issues like the deficiency of
radio-recurrence data transfer capacity. It has a decent
opportunity to supplant the customary Wi-Fi in light of the
fact that as an ever-expanding populace is utilizing remote
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web, the wireless transmissions are getting progressively
stopped up, making it increasingly more hard to get a
dependable, rapid sign. Right now, talked about the working
of li-fi and its application. additionally, the points of interest
and difficulties looked by li-fi. This paper likewise spread the
contrast between li-fi and wi-fi. Li-Fi correspondence client
consistently needs view network with its light source, along
these lines, some development looks into work is required to
defeat this impediment to executing this technology in
practice.
References:
[1] https://medium.com/acmvit/li-fi-the-future-ofinternet-e573eab6bd0d
[2] https://purelifi.com/technology/
[3] http://www.kscst.iisc.ernet.in/spp/39_series/SPP39S/
02_Exhibition_Projects/107_39S_BE_1098.pdf
[4] https://solutionsreview.com/wireless-network/thetop-benefits-and-disadvantages-of-li-fi-technology/
[5] https://www.techopedia.com/7/31772/technologytrends/what-are-the-advantages-and-disadvantagesof-li-fi-technology
[6] http://tec.gov.in/pdf/Studypaper/lifi%20study%20pa
per%20-%20approved.pdf
[7] https://arxiv.org/pdf/1610.07741.pdf
[8] http://www.aijet.in/v3/1601003.pdf
[9] IMPACTP002.pdf
[10] Overview LI-Fi technology.pdf
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