Challenges for Li-Fi
Apart
from many advantages over Li-Fi, this technology is facing some problems such
as Li-Fi requires line of sight (LOS) and receiving device would not be shift
in indoors. A major challenge is how the receiving device will transmit data back to transmitter. Another
important issue is interference from external light sources like sun light,
normal bulbs; opaque materials in the path of transmission will cause
interruption in the communication. Another disadvantage is that Li-Fi doesn‟t
work in the dark or light can‟t pass through objects, so if the receiver is
inadvertently blocked in any way, then the signal will immediately cut out. And
the signal is easily blocked by somebody simply walking in front of the LED
source.
Li-Fi versus Wi-Fi
Wi- Fi is the popular name for the wireless Ethernet 802.11b standard for Wire line local area networks (WLANs). It is the name of a popular wireless networking
technology that uses radio waves to provide wireless high-speed Internet and
network connections. This technology works with no physical wired connection
between sender and receiver by using RF, a frequency within the electromagnetic
spectrum associated with radio wave propagation. When an RF current is supplied
to an antenna, an electromagnetic field is created that then is able to
propagate through space.
Li-Fi is a term of one used
to describe visible light communication technology applied to high speed
wireless communication. It acquired this name due to the similarity to Wi-Fi,
only using light instead of radio. Wi-Fi is great for general wireless coverage
within buildings, and li-fi is ideal for high density wireless data coverage in
confined area and for relieving radio interference issues, so the two
technologies can be considered complimentary. Li-Fi provides better bandwidth,
efficiency, availability and security than Wi-Fi and has already achieved
blisteringly high speed compare with Wi-Fi. It is low-cost technology because
of nature of LEDs and lighting units and there are many opportunities to
exploit this medium. Table 1 shows a comparison between Li-Fi and Wi-Fi.
Table 1:
comparison between Li-Fi and Wi-Fi
technology
|
Bandwidth
Expansion
|
Speed
|
Data
Density
|
Rang
|
Security
|
Power
available
|
ecological
impact
|
Cost
|
Wi-Fi
|
Limited
|
150
Mbps
|
Low
|
medium
|
Good
(medium)
|
Low
|
medium
|
medium
|
Li-Fi
|
Exceptional
|
>10
Gbps
|
High
|
Low
|
Excellent
(High)
|
High
|
Low
|
Low
|
Conclusion
The
possibilities are numerous and can be explored further because the concept of
Li-Fi is currently attracting a lot of eye-balls because it offers a genuine
and very efficient alternative to radio based wireless. It has a good chance to
replace the traditional Wi-Fi because as an ever increasing population is using
wireless internet, the airwaves are becoming increasingly clogged, making it
more and more difficult to get a reliable, high-speed signal. In the future,
data for laptops, smart phones and tablets can be transmitted through light in
the room by using Li- Fi. Researchers are developing micron sized LED which are
able to flicker on and off around 1000 times quicker than larger LED. If this
technology can be put into practical use, every bulb can be used as a Wi-Fi
hotspot to transmit wireless data and we will proceed toward the cleaner,
greener, safer and brighter future. This concept promises to solve issues such
as the shortage of radio-frequency bandwidth and boot out the disadvantages of
Wi-Fi. Li-Fi is the upcoming and on growing technology acting as competent for
various other developing and already invented technologies. Hence the future
applications of the Li-Fi can be predicted and extended to different platforms
and various walks of human life.
NEXT COMING:::GI-FI TECHNOLOGY
