Li-Fi Technology

In the recent years, wireless technologies have taken a new dimension in the ways society lives. Wireless broadband is available to everyone. Whether the users are at home, driving the car, sitting in the park, and it would even work while people are a pleasure boat ride in the middle of a lake. And because of this, the need to have information at any time and be connected in all places, all the time has been satisfied.

Wireless communication helps businesses more easily stay in touch with customers, suppliers, and employees and provides more flexible arrangements for organizing work. Wireless technology has also created new products, services, and sales channels. If one requires mobile communication and computing power or remote access to corporate systems, you can work with an array of wireless devices: cell phones, personal digital assistants (PDAs), and smart phones. Personal computers are also starting to be used in wireless transmission. Mobile laptop computers equipped with wireless network interface cards link to the wired LAN by communicating with the access point. The access point uses radio waves to transmit network signals from the wired network to the client adapters, which convert them into data that the mobile device can understand. The client adapter then transmits the data from the mobile device back to the access point, which forwards the data to the wired network.

It uses electromagnetic field to transfer data, for the purposes of automatically identifying and tracking tags attached to objects.

this work aims to show the development of this new technology that is revolutionizing the world because its simple of use at home or at job, to transmit music and videos in high quality, from a laptop to a screen, avoiding HDMI connections.

Fiber-optic technology is often discussed in a wide range of conversations. This may be when people talk about TVs, phones, internet, or general technology. Fiber optics may also be referred to when talking about light and optics. An optical fiber is defined as a “flexible, transparent fiber made by drawing glass (silica) or plastic to a diameter slightly thicker than that of human hair” (Wikipedia). These fibers are used as a means of light transmission from one end of the fiber to the other end of the fiber and this is referred to as fiber-optic communications. These fibers are quite technologically advanced because they have the ability to transmit more data and at a quicker rate than normal cables made of wire. There is also much less lost data when using fiber-optic technology. Clearly, the benefits of fiber-optics are much greater than traditional wired cables. Fiber-optic cables are also used for the purpose of lighting and sensing. There are already many practical applications of the technology such as lasers, but these applications are just the beginning of the potential of this powerful technology.

The implementation of light fidelity (Li-Fi) is the next step towards a world characterized by the Internet of Things (IoT) because it will enable faster communication, release pressure off of the RF spectrum, and increase network security. Li-Fi, like WiFi,

Visible light makes up a very small part of the full electromagnetic spectrum. Electromagnetic waves that are of higher energy than visible light (higher frequency, shorter wavelength) include ultraviolet light, X-rays, and gamma rays. Lower energy waves (lower frequency, longer wavelength) include infrared light, microwaves, and radio and television waves.

Once confined to the realm of fiction, the wireless transmission of energy has become a reality in the past decade as part of a broader and already-flourishing trend of wireless technology. As the proliferation of personal and portable electronic devices continues to inundate the market, the need for convenient and efficient ways to power them has become ever more intensified. This need arises from the fact that energy transfer through copper wires represents a substantial financial encumbrance and imposes mobility limitations. Importantly, traditional energy transfer represents a drain on both consumers and businesses. Wireless energy has emerged

to permit the digital processing of these signals. In this digital Era, Signal processing plays an

The technology to deliver high speed data over existing power has emerged. It is known as Broadband over Power Line (BPL).

eye cannot detect, so the result in form of light appears constant and hence offering connectivity. More sophistication in the transmission techniques can further maximize the transfer of data rate through VLC. Till now this technique was implemented through white LED bulbs only but groups at the University of Oxford and the University of Edinburgh are focusing on parallel data transmission by the use of multiple LEDs or array of LEDs, where each LED allows a different stream of data. Mixtures of red, blue, green LEDs are also used by some teams to encode different data channels by varying the light frequencies. In simple words we can consider it to be a light based Wi-Fi which has achieved high speed in the labs at Heinrich Hertz institute in Berlin, Germany of around 500 megabytes per second by the use of a standard white-light LED. So quiet obviously, modems would be replaced by transceiver incorporated LED lamps which can fulfill the purpose of lightening the room as well as transmitting the data. The technology makes use of a part of an electromagnetic spectrum and was demonstrated at 2012 consumer electronics show in Los Vegas where a pair of Cisco smartphone was used to transfer data using light of varying intensity from screens.

For years, infrared LED has been merely a system for piping light around corners and into the inaccessible places to allow the hidden to be lighted. But now, infrared LED has evolved into a system of significantly greater importance and use. Throughout the world, it is now being used to transmit voice, television and data signals as light waves. Its advantages as compared with conventional coaxial cable or twisted wire pairs are manifold. As a result, millions of dollars are being spent to put these light wave communication systems into operation.

Abstract – Conventional wireless communication schemes use radio/micro wave frequencies for data transmission, primarily because of the availability of high sensitivity receivers and ability to provide broad coverage at low frequencies and line of sight communication at high frequencies. But, RF can support only a limited bandwidth due to confined spectrum availability. Therefore the expanding demand for wireless data has led to clogging of the radio spectrum. Thus there is a need to study and use new communication technologies in near future that will reduce interference and will be a clean source of communication. Communication is providing new advances constantly, people are depending more and more on the benefits they provide.

The recent invention by Professor Harald Haas of The University of Edinburgh using visible light as a source to send data led us to do some research on Visible Light Communication, ultimately using this research for our project for the final year of my undergraduate program. In this the data is being transferred using visible light from transmitter to another receiver. It had unique features like it required very less hardware and a easy to learn software, the visual basic 2.0. The Project in the final year of diploma was the 'CAR BATTERY INVERTER’ in which it converts the Direct Current into Alternating Current in most feasible way. This project was selected by our college to represent it for the International Level Project Competition Cum Exhibition, for which we received Participation Certificates. During the same time, I attended the workshop on R-duno bot, which was held in one of the reputed institute of India, the IIT BOMBAY (Indian Institute of Technology, Bombay).

Many research has revealed the theoretical throughput of Li-Fi system can be much greater than a traditional wireless radio communication systems as higher frequency will transmit a higher data rate. e.g. the visible light bandwidth spectrum is 10,000 times more than RF frequency band. With various experiment, the Li-Fi bit rate has been greater than 1Gbps. At home or office Li-Fi with the bit rate of 224 Gbps which is 100 times faster than the average WI-FI connection. With a larger modulation bandwidth, Khalid et al. presented a link implementation that can achieve a 3.4 Gbps link with an off-the-shelf RGB LED. Tsonev et al. have showed a data rate of 3.5 Gbps from a single-color micro LED in a single-input– single-output (SISO) setting. (Dimitrov, S. & Haas, H. 2015)