Showing papers on "Li-Fi published in 2013"

Visible light communication: opportunities, challenges and the path to market

Abstract: Visible light communication is a potentially disruptive form of wireless communication that can supplement radio frequency communication and also uniquely enable novel mobile wireless device use cases. High data rate downlink communication in homes and offices and high accuracy indoor positioning in retail stores are two of the most compelling use cases of this promising new technology. Large-scale commercialization of visible light communication devices will depend on both the development of robust and efficient engineering solutions, and the execution of incremental commercialization strategies.

Light fidelity (Li-Fi): towards all-optical networking

Abstract: Motivated by the looming radio frequency (RF) spectrum crisis, this paper aims at demonstrating that optical wireless communication (OWC) has now reached a state where it can demonstrate that it is a viable and matured solution to this fundamental problem. In particular, for indoor communications where most mobile data traffic is consumed, light fidelity (Li-Fi) which is related to visible light communication (VLC) offers many key advantages, and effective solutions to the issues that have been posed in the last decade. This paper discusses all key component technologies required to realize optical cellular communication systems referred to here as optical attocell networks. Optical attocells are the next step in the progression towards ever smaller cells, a progression which is known to be the most significant contributor to the improvements in network spectral efficiencies in RF wireless networks.

Visible Light Communication

Abstract: Light Emitting Diodes are set to penetrate many areas of everyday life. An interesting property of these devices in addition to their lightening capabilities, is that they can also be utilised for data transmissions as well. LED's require low power for their operation and have very high switching speeds. This dual purpose application can reduce our dependency on the densely used means of communication the Radio frequency communication. The project aims to build a system which carries out communication using visible light that are employed for indoor illuminations. The higher bandwidth of the visible light is exploited for high speed data transmissions. For the communication to be full duplex it requires a downlink and an uplink. The downlink is implemented using the visible light. Whereas the uplink is provided using Infrared LED's, as visible light would serve no purpose of illumination. Furthermore, the IR link also eliminates the chance of interference. When communication is carried out through visible light there are problems associated with it. The data transmission rates should be high enough so that flickering of the LED's should not be detected. Sometimes it is possible for complete fadeout of the signals. To protect the data integrity the data should be framed, so as to detect lost signals and to ensure correct transmission and reception of the data. Computer network protocols like stop and wait algorithms [1] are employed to solve this problem. The data can be of any form such as text, an audio, image or the video. This project shows how visible light can be used to transfer text data from one computer to the other computer. The computers are used as the end device. The computers with the help of Python [2] can be used to interface software to the hardware.

LIGHTNETs: Smart LIGHTing and Mobile Optical Wireless NETworks — A Survey

Abstract: Recently, rapid increase of mobile devices pushed the radio frequency (RF)-based wireless technologies to their limits. Free-space-optical (FSO), a.k.a. optical wireless, communication has been considered as one of the viable solutions to respond to the ever-increasing wireless capacity demand. Particularly, Visible Light Communication (VLC) which uses light emitting diode (LED) based smart lighting technology provides an opportunity and infrastructure for the high-speed low-cost wireless communication. Though stemming from the same core technology, the smart lighting and FSO communication have inherent tradeoffs amongst each other. In this paper, we present a tutorial and survey of advances in these two technologies and explore the potential for integration of the two as a single field of study: LIGHTNETs. We focus our survey to the context of mobile communications given the recent pressing needs in mobile wireless networking. We deliberate on key challenges involved in designing technologies jointly performing the two functions simultaneously: LIGHTing and NETworking.

Integration of indoor visible light and power line communication systems

Abstract: With the recent successful standardization of broadband power line communication (PLC) (IEEE 1901, ITU-T G.9960/61) and visible light communication (VLC) (IEEE 802.15.7), there is an excellent opportunity to consider their integration. In particular, there is inherent benefit to leveraging existing power line infrastructure to provide connectivity while exploiting energy-efficient LED illumination systems for wireless downlink. The ubiquity of LED lighting together with power line networks leads us to conclude that VLC will be a strong complementary wireless technology to indoor PLC much in the way that Wi-Fi currently supports broadband Ethernet connections. This paper will survey some aspects of both PLC and VLC and present new proposals for their integration.

LiFi Integrated to Power-lines for Smart Illumination Cum Communication

Abstract: Visible Light Communication (VLC) system based on white LEDs has emerged as an eco-friendly IT green technology using THz visible light spectrum in provision of both lighting and wireless access. Installation of new communication cables between other fixed network (PC, Set-Top Box, fiber networks, etc.) and LED lights is expensive, disruptive and time consuming process. Meanwhile, the power-line communications (PLC) can make it possible to use the power lines as the medium of communications. The utilities of home networking over power-lines can take advantage of the existing wiring infrastructure for provision of illumination cum communication. The integrated system of VLC and PLC is a smart way of fulfilling the premise of broadband access for home networking, while providing efficient and low-cost lighting. To achieve the higher data rates (MHz), PLC channel is simulated using DMT-QAM modulation scheme.

A survey on Transmission of data through illumination - Li-Fi

Abstract: Li-Fi is a new wireless technology to provide the connectivity with in localized network environment. The main principle of this technology is we can transmit the data using light illumination by using light-emitting diodes where radio frequency is media in Wi-Fi and LED bulb light intensity is faster than human eye can follow. Prof Harald Haas an expert in optical wireless communications at the University of Edinburgh, he was demonstrated how an LED bulb equipped with signal processing technology could stream a high-definition video to a computer. By using this technology a one-watt LED light bulb would be enough to provide net connectivity to four computers. He coined the term "light fidelity" or li-fi and set up a private company, Pure VLC, to exploit the technology. . He envisions a future where data for laptops, smart phones, and tablets is transmitted through the light in a room. And security would be snap – if you can’t see the light, you can’t access the data. Keywords: Li-fi, Wi-fi, LED, VLC.

LED to LED communication with WDM concept for flash light of Mobile phones

Abstract: After observing recent developments in Free Space Optical Communication especially Visible Light Communication, It is clear that LED is main component as a source. LED being solid state device makes endless list of possibilities. But here we will get through its ability to sense light as well, and use of Wavelength Division Multiplexing (WDM) in mobile flash is also suggested, this opens door to many applications.

Recent advancements in li-fi technology

Abstract: In this era of wireless technology, the number of devices accessing the internet is growing by the minute. This has unfortunately led to an increase in network complexity, shortage of wireless radio bandwidth and an increased risk of interference of radio frequencies. Therefore, there is a pressing need to find new means of wireless communication which is fast, reliable and error free. One such technology that promises to alleviate the problems as stated above is Light Fidelity or simply, 'Li-Fi'. Keywords—Li-Fi, VLC, Wireless Communication

New Epoch of Wireless Communication: LightFidelity

Abstract: We have Wi-Fi hotspots at home, coffee houses, hotels, airports and even cities and the Wi-Fi network system is constantly expanding. Due to this, Radio spectrum is getting clogged day by day and demand for wireless data is increasing exponentially every year. Everyone wants to use wireless data but capacity is drying up. Wireless radio frequencies are getting higher, complexities are increasing and RF interferences continue to grow. In order to overcome this problem in future, light –fidelity (Li-Fi) technology came into existence since 2011. Li-Fi is a wireless communication system in which light is used as a carrier signal instead of traditional radio frequency as in Wi-Fi. Li-Fi is a technology that uses light emitting diodes to transmit data wirelessly. Visible light communication (VLC) uses rapid pulses of light to transmit information wirelessly that cannot be detected by human eye. This paper will focus on Li-Fi technology over Wi-Fi technology and challenges for the new VLC technology.

Broadcasting MAC protocol for IEEE 802.15.7 visible light communication

Abstract: Every shared wireless communication channel needs a medium-access control (MAC) protocol by which nodes contend for the channel and eventually transmit without collisions. Over the past several decades, many MAC protocols have been designed and several are in operation in wireless networks today. The MAC layer emulates a full-duplex logical communication channel in a multi-point network. This channel may provide unicast, multicast or broadcast communication service. While these protocols work well for traditional data workloads, they are inadequate in emerging wireless networks where the nature of data transmissions and application requirements are different. This paper enhances IEEE 802.15.7 Short-Range Wireless Optical Communication Using Visible Light [1] MAC protocol for broadcasting system. By using Frame synchronization based TDMA and Network Calculus, the new proposed broadcasting MAC can support QoS Visible Light Communication multichannel broadcasting.

The demonstration of wireless access via visible light communications

Abstract: Wireless data transmission via visible light has been significantly explored with the development of white-LED. In this paper, we report a wireless access system via visible light communication (VLC) technology. In our demonstration, the custom-made USB board serves as the transceiver consisting of a LED-based transmitter and a photodiode-based receiver. Two USB boards are connected to two computers respectively, constructing a communication system. One computer, or an ARM development board being linked to the network acts as a router enables computer to have access to Internet via the visible light channel. The prototype demonstrates a transmission data rate up to 460800 baud without packet loss at a distance of 30cm. A 0.3W white LED is used and a 10-6 bit error ratio (BER) is achieved. The eye diagram performance of the VLC system is presented as well as the packet loss of the visible light link.

LED to LED communication with WDM concept for flash light of Mobile phones Visible Light Communication

Abstract: after observing recent developments in Free Space Optical Communication especially Visible Light Communication, It is clear that LED is main component as a source. LED being solid state device makes endless list of possibilities. But here we will get through its ability to sense light as well, and use of Wavelength Division Multiplexing (WDM) in mobile flash is also suggested, this opens door to many applications.

A tight curve warning system using FSK visible light and road-to-vehicle communication

Abstract: Rolling accidents often happen on the tight curves, so road-to-vehicle communication is required In this paper we apply visible light communication to road-to-vehicle communication and propose a tight curve warning system We use the hierarchical coding of FSK because a receiver can receive both low frequency data and high frequency data when it is close to the sender, and it can receive only low frequency data when it is far away from the sender We made a 1/32 scale prototype model and the experimental results show its ability to distinguish the communication distance from the frequency The car on our prototype system put on its brakes 2 m from an LED using 166 kHz

Review of Li-Fi Technology: New Future Technology- Light Bulb to Access the Internet!

Abstract: Now a day with the advent of technology, communication became the backbone of Information and Communication Technology. ICT is made our globe like a town. Today everyone like Business, institutions ,organizations want s right information at the right time Which, needs fast internet connectivity. Present paper reflects the Future of Communication (LI-FI) which may affect all lives. Li-Fi technology that may be approximately as fast as 500MBPS (30GBPS per minute) an alternative, cost effective and more robust, and useful than Wi-Fi Technology. It is the fast and low cost wireless communication system which is optical version of the Wi-Fi. The Visible light communication may be the future of Internet . Harald Haas has come up with a solution he calls "data with the help of illumination" - the fiber out of fiber optic cabel by sending data through LED. lights that varies in intensity faster than the human eye can follow. In future where data for personal computers ,laptops, smart phones, and tablets is transmitted through the light in a room. And security would be snap - if you can not see the light, you can not access the data through internet.

A Comparative and Critical technical Study of the Li-Fi - (A Future Communication) V/S Wi-Fi

Abstract: Now a days with the advent of technology,, communication became the backbone of ICT. ICT had made our globe like a town. Today everyone (Businees,institutions ,organizations ,entreprenuers is thrust for getting right information at the right time and right place .Which, requires fast internet connectivity, Technology and large spectrum of channels. Present paper reflects the Future of Communication (LI-FI) which may affect all lives. It a technology that may be as fast as 500MBPS (30GBPS per minute) an alternative, cost effective and more robust and useful than Wi-Fi. The Visible light communication which may be the future of Internet

Li-Fi (Light Fidelity)- A New Paradigm inWireless Communication

Abstract: The first word that comes to your mind when you read the title is Wi-Fi (wireless fidelity), most of us are familiar to this, it uses 2.4-5 GHz RF (radio frequency) to deliver internet access around a wide area. Whenever you are using internet over a wireless network you may be deprived of the speed over that network. As more and more users get connected to the network, the rate of data transfer gets reduced. So when people with their many devices access wireless internet, clogged airwaves are going to make it increasingly difficult to latch onto a reliable signal. The wireless network uses radio waves for the transmission of the data. But radio waves are just one part of the spectrum that can carry our data. We have become quite dependent upon this nearly ubiquitous service. But like most technologies, it has its limitations. So a question arises in our mind that can’t we use the other part of the spectrum? The answer is “YES”. The part of spectrum that we can use conveniently is the visible spectrum. German physicist, Dr. Harald Haas, has put forward the idea of “Data Through Illumination”—taking the fiber out of fiber optics by sending data through an LED light bulb that varies in intensity faster than the human eye can follow. It’s the same idea behind infrared remote controls, but far more powerful. Haas says his invention, which he calls D-Light, can produce data rates faster than 10 megabits per second, which is speedier than your average broadband connection. He envisions a future where data for laptops, smart phones, and tablets is transmitted through the light in a room. And security would be snap – if you can’t see the light, you can’t access the data. Optical wireless technologies, sometimes called visible light communication (VLC), and more recently referred to as Li-Fi (Light Fidelity), on the other hand, offer an entirely new paradigm in wireless technologies in terms of communication speed, flexibility and usability. In simple words Li-Fi is a method of communication in which we transmit data using visible light region of electromagnetic spectrum with the help of LEDs. So by Li-Fi you attain data transmission by using your simple light resources. So you can now connect to internet where ever you find light, in schools, colleges, offices, aircrafts and even on the roads and almost everywhere because there are rare places where light is not present.

Li-Fi: Data Onlight Instead of Online

Abstract: The demand for wireless data is increasing at an exponential rate hence to cater the demand, various technology options are to be looked for and need to be implemented. An emerging technology using Visible Light Communications (VLC) for high speed wireless communications is Light Fidelity dubbed as Li-Fi. To provide high speed communication, light is modulated without interfering the main purpose of lamp that is of illumination. LEDs are considered as a key component to be used in transmission because of its low cost and Omni-presence. In this paper in section II, brief history related to the development of this technology has been discussed. The aim of this paper is show the potential of using light source and to exploit this as a medium for providing communication. Various applications where Li-Fi has been put to use already are discussed.

LED Visible Light Communication System Design and Performance Optimization Based on Ethernet

Abstract: To satisfy the requirements of visible light wireless communication technology, designed LED visible light communication application system based on Ethernet. Influence factors of system performance were studied and took specific measures to optimize system performance. Reduced the influence of background light, improved the communication distance, inhibited LED light source tailing phenomenon, and improved the rate of the edge of the LED. The LED visible light communication technology blends into the Ethernet, provides a new solution for wireless broadband access, this solution has the broad application prospect.

System performance of radio on visible light (RoVL) communication system

Abstract: Telecommunication industry has been expanding swiftly with the inception of new features and services to dispense sophistication to mankind. One promising stretch that could perhaps expand the applicability of this industry is mobile telephony through visible light channels, capable of bestowing cell phone connectivity to users in RF restricted or poor signal connectivity regions. Despite, the introduction of several modulation techniques ever since the invention of visible light technology, it is imperative to choose techniques that are spectral and band efficient. In addition, bearing the facility to be integrated into the mobile phone systems without extensive hardware modifications. To address this concern the following paper introduces a gaussian filtered method of continuous phase modulation into visible light communication. The entire communication model is hardware implemented for real time testing & measurement in company with mathematical simulations. Paramount performance parameters of the system were evaluated to confirm its pertinence for mobile signal transmission as outlined by the leading telecommunications institutes for global mobile standardization.

140Mbit/s Single-Channel Visible Light Communications Link Based on Discrete-Multitone Modulation

Abstract: In this paper, we report a visible light communication link operating at 140Mbit/s by using discrete-multitone modulation and with a bit-error ratio below 2×10−3.

Scope and Applications of Li-Fi the Innovative Technology in Wireless with Wi-Fi

Abstract: This latest Technology LI-FI describes transmission of "data through illumination" taking the fiber out of fiber optic by sending data through an LED light bulb that varies in intensity faster than the human eye can follow. It's the same idea band behind infrared remote controls but far more powerful. Harald Haas says his invention, which he calls D- LIGHT, can produce data rates faster than 10 megabits per second, which is speedier than your average broadband connection. He envisions a future where data for laptops, smart phones, and tablets is transmitted through the light in a room. And security would be snap - if you can't see the light, you can't access the data.

An integrated wireless system using visible light

Abstract: Lighting systems are undergoing a revolution from fluorescent lamps or tubes to light emitting diodes. Light emitting diodes have greater energy efficiency and longer lifetime. Built on this new lighting system, this paper considers further using the light sources to provide other benefits. The resulting system has low deployment cost and most importantly, it uses the unique characteristics of visible light to complement the existing wireless communication systems. Using visible light communications, this paper outlines a system design which has three different features. Firstly, it provides a provable secure wireless communication. In particular, a user is authenticated according to his/her location. Secondly, it includes indoor positioning systems with high precision. Lastly, it also supports information broadcast with a high frequency reuse factor.