Light Fidelity (Li-Fi) Technology
Forget
Wi-Fi. It Is Li-Fi: internet through Ligthbulbs!
Abstract
We know that spectrum is the rare coin for communication engineers. Nowadays, with the rapid growth of wireless communications the problem of using spectrum efficiently has become more important. Many solutions have been proposed to solve this issue; one of these solutions is the usage of visible light frequencies to send data. These frequencies are already free and unused. Light fidelity (Li-Fi) is a new short range optical wireless communication technology which provides the connectivity within a local network, by using Light-Emitting Diodes (LEDs) to transmit data depending on light illumination properties.
We know that spectrum is the rare coin for communication engineers. Nowadays, with the rapid growth of wireless communications the problem of using spectrum efficiently has become more important. Many solutions have been proposed to solve this issue; one of these solutions is the usage of visible light frequencies to send data. These frequencies are already free and unused. Light fidelity (Li-Fi) is a new short range optical wireless communication technology which provides the connectivity within a local network, by using Light-Emitting Diodes (LEDs) to transmit data depending on light illumination properties.
We shall explain in this report the
basic foundation of this new technology and its important applications. Then we
discuss its challenges and implemented projects all over the world.
Introduction
Transfer data from one place to another is one of the most important day-to-day activities. The current wireless networks that connect us to the internet are very slow when multiple devices are connected. As the number of devices that access the internet increases, the fixed bandwidth available makes it more and more difficult to enjoy high data rates and connect to a secure network. Nowadays, Everyone is interested in using his mobile phone, laptop to communicate with other people through Wireless-Fidelity (Wi-Fi) systems, and this technology, Wi-Fi, is widely used in all public areas like home, cafes, hotels and airports by people, also the time usage of wireless systems is increasing exponentially every year; but the capacity is going down, due to the limitation of Radio Frequency (RF) resources, so we are going to suffer from severe problem.
In order to overcome
this problem in the future, Professor Harald Haas, an expert in optical
wireless communications, proposes in 2011 a brilliant and applicable solution
by using light to transmit data, he demonstrated how an Light-Emitting Diodes
(LED) bulb equipped with signal processing technology could stream a
high-definition video to a computer and he showed that one watt LED light bulb
would be enough to provide net connectivity to four computers.
This new technology
is known as Light–Fidelity (Li-Fi).
It is a short range wireless communication system based on light illumination
from LED, and use the visible light as a signal carrier instead of traditional
RF carrier as in Wi-Fi. Professor Harald Haas coined the term "Light-Fidelity" and set up a
private company, called “Pure Visible Light Communication”, to exploit that
technology and envisions a future where data for laptops and smart phones are
transmitted through the light in a room in a secure way.
Here, we will talk about its features,
applications and advantages, some practical projects that have been
implemented; and we will show that it can be seriously the future of
communication technology.
NEXT COMING:::PROBLEMS OF WIRELESS COMMUNICATION SYSTEMS
