Internet of things (IoT) is progressively affiliated to
our day-to-day life. The examples enlarge from smart
connected homes to wearable to healthcare . IoT
applications not only just boost our comfort but also
give us more control to reduce periodic work life and
personal tasks . Communication is the vital part of
every IoT applications. Usually, the wireless
communication lay on radio waves. In future, the
need for bandwidth in radio spectrum will exhaust.
The need for the alternative method is important. LiFi was invented by Dr. Harald Haas and successfully
demonstrated at TED in 2011 . Li-Fi is a visible
light communication and subsidiary part of optical
fiber communication . Optical fiber
communication uses coherent light sources and in LiFi use incoherent light sources . The advent of
light emitting diodes produce incoherent light, this
can be a Li-Fi transmitter. There are many pros and
cons for this technology. The entire radio spectrum
communication can not replace by Li-Fi but there is a
certain area that can reduce the use of radio waves
such as near field communication, office or home
applications, safe environmental conditions such as
petrochemical plants etc . This paper proposes a
high-speed transmission technique through Li-Fi,
which is called triplet Li-Fi. The common scenario
uses a visible light source for bearing the data.
Visible light can be produced by RGB(red, green,
blue) colors, it is meant to say that each spectrum
can carry different data. The flickering of light is not visible to human eyes and it remains Li-Fi. Through
this methodology, the Li-Fi can improve it’s capability
by three times and can improve the physical layer
security in communication.
INTERPRET WITH TRIPLET Li-Fi
Li-Fi is an added networking physical layer
argumentation for current RF methods such as
wireless fidelity (Wi-Fi) or long term evolution (LTE).
In every Li-Fi source, LED is the bidirectional entry
point for the downlink . The uplink should not
interpret the downlink, this can be an infrared light
source . The greatest fallacy of Li-Fi is a line-ofsight (LOS) link technology .
The figure 1 illustrates the perspective of Triplet Li-Fi.
Visible light can be reversed into RGB. Each color
packed with different data. Perfect ratio of RGB mix is
achieved through heed current. Red and green
spectrum convey the test sequence and it is
generated by an astable multivibrator with 50% duty
cycle. Blue spectrum can tote a computer generated
binary data, which only permits transistor-transistor logic (TTL). The transmitter includes a simple receiver,
a non-filtered photodiode in photovoltaic mode
which makes it bidirectional.
This operation does not deal with any kind of
modulation technique. Greater attainments are
feasible with modulation scheme such as orthogonal
frequency division multiplexing (ODFM). This is the
mild implementation of triplet Li-Fi which extends
generously to the reader.
The figure 2 illustrates depict of the triplet Li-Fi
reception. Blended RGB can be discriminated by the
colour filters which can feed to photodiodes. Packed
data in blue spectrum must be severalized precisely.
Implementation of the trans-impedance amplifier
does the translation of photocurrent to the prime
voltage level with edge frequency of 1.9Mhz.
Preamplifier does the principle voltage for the buffer.
Buffer deeds the two services in this case. It
compromises the noise generated by capacitance
effect in the photodiode and isolates among
computer. This implementation does not discuss the
APPLICABILITY OF LI-FI
Triplet Li-Fi lengthens the adequacy of Li-Fi
proficiency. Li-Fi is voluminous technology that can
frame radical change in future. Li-Fi can be the key
for IoT applications . Li-Fi can furnish the 5th
generation cellular technology and beyond. From
many years light emitting diodes leading the
lightening method and currently LED lighting are an
integral part of the budding smart cities, as it can be
Li-Fi spotlights. Li-Fi can eliminate complex routing
of wires in offices and hospital applications. LED
lighting can transfer the data so it will not expend
additional space. Light has the catalytic property as it
is an energy source.This property unfolds the
wireless (solid-state drive)SSD/USB in the near field
of communication(NFC) applications and more.
Emerging mobile phones and computer displays,
backlights or flashlight can remit the data. Triplet LiFi accredit appended security measures in physical
layer communication that can employ additional
security in digital payment applications.
LIABILITY AND DELUSION ABOUT LI-FI
While gathering about Li-Fi, there can be many
misconceptions too. In broad, the Li-Fi operates in
normal environment. Apparently, sunlight enacts a
constant conflict signal to the Li-Fi reception and it is
easily distinguishable from modulated light. Li-Fi
serves frequency generally greater than 1Mhz.
Hence, a constant sunlight easily drains out. Li-Fi is
reorganized as physical layer communication.
Therefore, the underlying existing communication
protocols can be compatible in Li-Fi. Light can not
penetrate any opaque objects. Thus it improves
controllability and security. Power consumption of
Wi-Fi router estimated that 2- 20 watts, with six watts
being average. Power consumption of LED routers will be pretty much lower when it is flickering. There
are many companies researching about Li-F and by
2020, Li-Fi will be a part of communication market in