This document is a seminar report on Li-fi technology submitted by Dhabekar Roshan Vitthalrao in partial fulfillment of a master's degree. It includes an abstract describing Li-fi technology, which uses visible light communication through LED bulbs to transmit data. The report covers the genesis of Li-fi from Dr. Harald Haas's initial demonstration in 2011. It explains how Li-fi works by modulating LED light intensity and discusses applications like use in airports and hospitals free from radio bandwidth limitations. The conclusion is that Li-fi could provide a wireless alternative if practical challenges around line-of-sight transmission can be addressed.
Li-Fi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission. It is a faster and more secure alternative to Wi-Fi networks. Li-Fi works by transmitting data through LED light bulbs and receiving data through photodetectors. At its core, Li-Fi uses visible light communication (VLC) technology which utilizes part of the optical spectrum that is not used for illumination for high-speed data communication. Li-Fi has several advantages over Wi-Fi such as higher speed, more secure communication, and the ability to work in places where radio waves are not allowed or may interfere with sensitive equipment. However, Li-Fi also faces challenges as it requires line
Li-Fi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission.Li-Fi is designed to use LED light bulbs similar to those currently in use in many energy-conscious homes and offices.
Li-Fi is a wireless communication technology that uses visible light communication (VLC) to transmit data using LED light bulbs. By switching LED bulbs on and off faster than the human eye can detect, digital data can be encoded and transmitted through the light. Li-Fi provides several advantages over traditional Wi-Fi including much higher speeds, no interference with other wireless devices, and the ability to be used in places where radio signals are restricted. Researchers have achieved speeds over 500 megabytes per second in labs. Li-Fi has the potential to help solve the worldwide shortage of wireless spectrum and enable new applications for wireless connectivity through light.
This document summarizes a seminar on LiFi technology presented by students at Meghnad Saha Institute of Technology under a professor. It introduces LiFi as using visible light communication instead of radio waves for wireless internet. The seminar covers the history of LiFi invention, issues with radio spectrum capacity, the working mechanism of transmitting data through light, applications like using streetlights and traffic lights for internet access, advantages like high security and speed, and limitations like needing line of sight.
Li-Fi is a visible light communication system that uses light from LED lights to deliver high-speed wireless communication, similar to Wi-Fi. It was coined in 2011 by Professor Harald Haas. Data is transmitted by switching the LEDs on and off very quickly in a binary code. The main components are a high brightness white LED to transmit and a silicon photodiode to receive. Li-Fi provides advantages over radio-based networks like higher speed, greater capacity, and more security. Potential applications include use in vehicles, aircraft, hospitals and traffic lights.
Li-Fi is a visible light communication system that uses LED light bulbs to transmit data wirelessly. It was coined by Professor Harald Haas in 2011 and provides high-speed communication similar to Wi-Fi but using light instead of radio waves. Li-Fi has several applications such as in traffic lights, airplanes, hospitals, and street lamps. It provides more secure and faster communication than Wi-Fi but has limitations like the need for line of sight and interference from other light sources. Current companies developing Li-Fi technology include pureLIFI and LIFI-X.
This document is a seminar report on Li-fi technology submitted by Dhabekar Roshan Vitthalrao in partial fulfillment of a master's degree. It includes an abstract describing Li-fi technology, which uses visible light communication through LED bulbs to transmit data. The report covers the genesis of Li-fi from Dr. Harald Haas's initial demonstration in 2011. It explains how Li-fi works by modulating LED light intensity and discusses applications like use in airports and hospitals free from radio bandwidth limitations. The conclusion is that Li-fi could provide a wireless alternative if practical challenges around line-of-sight transmission can be addressed.
Li-Fi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission. It is a faster and more secure alternative to Wi-Fi networks. Li-Fi works by transmitting data through LED light bulbs and receiving data through photodetectors. At its core, Li-Fi uses visible light communication (VLC) technology which utilizes part of the optical spectrum that is not used for illumination for high-speed data communication. Li-Fi has several advantages over Wi-Fi such as higher speed, more secure communication, and the ability to work in places where radio waves are not allowed or may interfere with sensitive equipment. However, Li-Fi also faces challenges as it requires line
Li-Fi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission.Li-Fi is designed to use LED light bulbs similar to those currently in use in many energy-conscious homes and offices.
Li-Fi is a wireless communication technology that uses visible light communication (VLC) to transmit data using LED light bulbs. By switching LED bulbs on and off faster than the human eye can detect, digital data can be encoded and transmitted through the light. Li-Fi provides several advantages over traditional Wi-Fi including much higher speeds, no interference with other wireless devices, and the ability to be used in places where radio signals are restricted. Researchers have achieved speeds over 500 megabytes per second in labs. Li-Fi has the potential to help solve the worldwide shortage of wireless spectrum and enable new applications for wireless connectivity through light.
This document summarizes a seminar on LiFi technology presented by students at Meghnad Saha Institute of Technology under a professor. It introduces LiFi as using visible light communication instead of radio waves for wireless internet. The seminar covers the history of LiFi invention, issues with radio spectrum capacity, the working mechanism of transmitting data through light, applications like using streetlights and traffic lights for internet access, advantages like high security and speed, and limitations like needing line of sight.
Li-Fi is a visible light communication system that uses light from LED lights to deliver high-speed wireless communication, similar to Wi-Fi. It was coined in 2011 by Professor Harald Haas. Data is transmitted by switching the LEDs on and off very quickly in a binary code. The main components are a high brightness white LED to transmit and a silicon photodiode to receive. Li-Fi provides advantages over radio-based networks like higher speed, greater capacity, and more security. Potential applications include use in vehicles, aircraft, hospitals and traffic lights.
Li-Fi is a visible light communication system that uses LED light bulbs to transmit data wirelessly. It was coined by Professor Harald Haas in 2011 and provides high-speed communication similar to Wi-Fi but using light instead of radio waves. Li-Fi has several applications such as in traffic lights, airplanes, hospitals, and street lamps. It provides more secure and faster communication than Wi-Fi but has limitations like the need for line of sight and interference from other light sources. Current companies developing Li-Fi technology include pureLIFI and LIFI-X.
This document provides an overview of Li-Fi technology. It discusses how Li-Fi works by using visible light communication through LED bulbs to transmit data. The LEDs rapidly flicker on and off, encoding data that can be received and interpreted at high speeds comparable or exceeding Wi-Fi. Li-Fi was developed by researchers including Dr. Harald Haas and provides several advantages over radio-based Wi-Fi, including much higher available bandwidth, more localized coverage area, and ability to be used in places where Wi-Fi poses problems. The document outlines the history and development of Li-Fi, how it compares to Wi-Fi, and potential applications across various industries.
This document provides an overview of Li-Fi technology. It begins with definitions of Li-Fi and discusses its history, starting with Professor Harald Haas demonstrating data transmission through an LED light bulb in 2011. It then covers the current congestion of the radio spectrum, issues with radio usage, and how Li-Fi could help resolve these issues. The document explains the principles and working of Li-Fi, why it uses visible light communication, and compares it to Wi-Fi. It lists applications such as in traffic and homes. Finally, it discusses the merits and demerits of Li-Fi and concludes by envisioning future developments using arrays of micron-sized LEDs.
This document provides an overview of Li-Fi technology presented by Koteshwar Rao M. It defines Li-Fi as using LED light bulbs to transmit data by varying the intensity of light faster than the human eye can detect. Li-Fi uses visible light spectrum for communication. It has advantages over Wi-Fi such as higher speed, more bandwidth, more secure connections, and energy efficiency. Potential applications of Li-Fi include use in airlines, power plants, underwater environments, and converting every light bulb into an internet hotspot. Further enhancements may enable speeds over 10Gb/s.
The document discusses the history and development of wireless networks and introduces LiFi technology as an alternative to WiFi. LiFi transmits data through visible light communication by varying the intensity of LED bulbs and lamps. It has benefits over WiFi like higher speeds, more available spectrum, better security since light does not pass through walls easily. LiFi is expected to become widely available in the next decade and transform how people access and transmit data through ubiquitous light sources.
This document provides an overview of Li-Fi technology. It begins with an abstract describing the genesis of Li-Fi by Dr. Harald Haas and how it works by transmitting data through light intensity variations too fast for the human eye to detect. Section 2 introduces Li-Fi and how it uses LED bulbs to transmit digital 1s and 0s. Section 3 discusses the development of Li-Fi by Dr. Haas in 2011. Section 4 explains how Li-Fi works by modulating LED light and can achieve speeds over 500 megabytes per second. Section 5 compares Li-Fi to Wi-Fi, noting Li-Fi uses light instead of radio waves. Section 6 outlines several application areas of Li-Fi such as
The document is a PowerPoint presentation on Li-Fi technology. It introduces Li-Fi as a visible light communication system that can provide wireless internet access using LED bulbs. The presentation explains that Li-Fi uses LED bulbs that rapidly switch on and off to transmit digital signals, allows for faster data transfer than Wi-Fi, and provides several advantages like free spectrum and more secure communication. It also discusses the principles, construction, applications and comparisons of Li-Fi and highlights some challenges like light not passing through obstacles.
Li-Fi is a new wireless technology which provides the connectivity within 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. One germen phycist-Prof Harald Haas an expert in optical wireless communications at the University of Edinburgh, he demonstrated how an LED bulb equipped with signal processing technology could stream a high-definition video to a computer. By using this technology a 1 watt LED light bulb would be enough to provide net connectivity to four computers. This technology termed as "light fidelity". This technology allows us to transfer data more securely with higher data rates. This technology is still under research and further exploitation could lead to wide applications.
Li-Fi is a new technology that uses visible light communication and light-emitting diodes (LEDs) to transmit data wirelessly. It was introduced by physicist Harald Haas and provides data rates faster than Wi-Fi. Li-Fi uses LED light bulbs that vary in intensity faster than the human eye can detect to transmit data. It has advantages over Wi-Fi such as higher capacity, higher efficiency, greater availability, and better security since light cannot pass through walls.
This document discusses the technology of Li-Fi (Light Fidelity), which is a wireless communication system that uses light from LED bulbs to transmit data. It provides an introduction to Li-Fi, discussing how it works by modulating the intensity of LED light to transmit digital signals. The document then gives a brief history of Li-Fi, covering its development from 2004 onward by Professor Harald Haas. It also outlines some of the key advantages of using visible light over radio waves for wireless communication.
Li fi(light fidelity)-the future technology in wirelessakshay_panchal
This document discusses Li-Fi technology, which uses visible light communication to transmit data wirelessly. It provides an introduction to Li-Fi, including its history developed by Professor Harald Haas. Li-Fi works by varying the rate at which LED lights flicker on and off to transmit digital data. Compared to Wi-Fi, Li-Fi has advantages like higher speed, more bandwidth availability, more secure communication, and lack of interference. Potential applications of Li-Fi discussed include use in education systems, hospitals, aircraft internet access, and areas where other wireless technologies are banned. While Li-Fi does not pass through objects and can be interrupted by external light sources, it represents a promising future technology for wireless communication if developed
Seminar Report On Implementation Of Li-FI TechnologyAnjeet Kumar
Li-Fi is a wireless communication technology that uses light from LED bulbs to transmit data. The document discusses the history and development of Li-Fi technology. It provides details on how Li-Fi works by rapidly varying the intensity of LED light to transmit binary data. The document also discusses applications of Li-Fi technology in various sectors like hospitals, vehicles, and power plants.
Li-Fi is a new technology that uses visible light communication (VLC) to transmit data through LED light bulbs. It works by varying the intensity of light faster than what the human eye can detect. Li-Fi offers several advantages over traditional Wi-Fi, including higher capacity, better availability, higher security, and energy efficiency. It could help meet the rapidly increasing demand for wireless data as radio spectrum becomes more congested. If developed further, Li-Fi technology would allow wireless internet access from every light bulb.
Li-Fi is a technology that uses light from LED bulbs to transmit data wirelessly. It provides several advantages over traditional Wi-Fi including very high speeds, low energy consumption, secure transmission that cannot pass through walls, and the ability to be used in places where radio waves cannot reach. The technology works by switching the state of LED bulbs on and off very quickly in order to transmit binary code. It is still an emerging technology but has already been demonstrated to work at speeds over 10Mbps. Potential applications include use in street lights, hospitals, airplanes, and underwater.
This document provides an overview of Li-Fi technology through a presentation on the topic. It discusses the history of Li-Fi, how it works by transmitting data through LED light, its advantages over Wi-Fi such as higher bandwidth and more secure communication through visible light. Example applications are given such as using traffic lights and street lamps to transmit data. Challenges for Li-Fi are also noted, such as the need for line of sight transmission and potential interference from other light sources.
Li fi wireless optical networking technologySandeep Kadav
This document provides an overview of Li-Fi technology. It describes Li-Fi as a fast, optical version of Wi-Fi that uses LED lights to transmit data wirelessly. The technology was invented in 2011 by German physicist Harald Hass. Li-Fi offers higher data transfer rates and more security than Wi-Fi, works in dense environments, and has potential applications in hospitals, airlines, and underwater. However, Li-Fi faces limitations in not being able to pass through solid objects and potential interference from other light sources. Overall, the document argues that if developed, Li-Fi could provide internet connectivity anywhere there is light.
The document presents on Li-Fi technology. It discusses that Li-Fi uses LED lights to transmit data wirelessly similar to Wi-Fi. The history of wireless technology and Li-Fi is explained, including its invention in 2011. Current applications of Li-Fi are in traffic lights, hospitals and airplanes where radiowaves are restricted. Challenges of Li-Fi include interference from other light sources and difficulty transmitting signals through opaque objects. The conclusion is that if developed further, Li-Fi could provide wireless internet access from any light source.
A presention on LIFI technology..
Use MS Office 13 to view the original fonts and pics used within(as they are not supported in the previous versions..)
This document discusses Li-Fi technology, which uses LED light bulbs to transmit data by varying the intensity of light faster than what the human eye can detect. Li-Fi was pioneered in the 1990s and demonstrated by Harald Haas in 2011. It provides several advantages over Wi-Fi such as higher speed potential and no interference with radio frequencies. Li-Fi works by encoding binary data in the on-off states of an LED and can achieve speeds of over 100 Mbps. Potential applications include use in planes, hospitals, and as public internet hotspots through street lamps. However, challenges include light not passing through solid objects and interference from other light sources.
1. The document discusses a new technology called Li-Fi that transmits data through LED light bulbs by varying the intensity of light faster than the human eye can detect. This allows for wireless internet access through light.
2. One inventor, Dr. Harald Haas, developed this technology called "Data Through Illumination" which he claims can transmit data faster than average broadband speeds. He envisions wireless internet access for devices through light in a room.
3. The technology works by varying the intensity of LED lights to transmit binary code for "0" and "1" much like how infrared remote controls work but at higher speeds and amounts of data. This could provide wireless internet access through normal light in homes
This document provides an overview of Li-Fi technology. It discusses how Li-Fi works by using visible light communication through LED bulbs to transmit data. The LEDs rapidly flicker on and off, encoding data that can be received and interpreted at high speeds comparable or exceeding Wi-Fi. Li-Fi was developed by researchers including Dr. Harald Haas and provides several advantages over radio-based Wi-Fi, including much higher available bandwidth, more localized coverage area, and ability to be used in places where Wi-Fi poses problems. The document outlines the history and development of Li-Fi, how it compares to Wi-Fi, and potential applications across various industries.
This document provides an overview of Li-Fi technology. It begins with definitions of Li-Fi and discusses its history, starting with Professor Harald Haas demonstrating data transmission through an LED light bulb in 2011. It then covers the current congestion of the radio spectrum, issues with radio usage, and how Li-Fi could help resolve these issues. The document explains the principles and working of Li-Fi, why it uses visible light communication, and compares it to Wi-Fi. It lists applications such as in traffic and homes. Finally, it discusses the merits and demerits of Li-Fi and concludes by envisioning future developments using arrays of micron-sized LEDs.
This document provides an overview of Li-Fi technology presented by Koteshwar Rao M. It defines Li-Fi as using LED light bulbs to transmit data by varying the intensity of light faster than the human eye can detect. Li-Fi uses visible light spectrum for communication. It has advantages over Wi-Fi such as higher speed, more bandwidth, more secure connections, and energy efficiency. Potential applications of Li-Fi include use in airlines, power plants, underwater environments, and converting every light bulb into an internet hotspot. Further enhancements may enable speeds over 10Gb/s.
The document discusses the history and development of wireless networks and introduces LiFi technology as an alternative to WiFi. LiFi transmits data through visible light communication by varying the intensity of LED bulbs and lamps. It has benefits over WiFi like higher speeds, more available spectrum, better security since light does not pass through walls easily. LiFi is expected to become widely available in the next decade and transform how people access and transmit data through ubiquitous light sources.
This document provides an overview of Li-Fi technology. It begins with an abstract describing the genesis of Li-Fi by Dr. Harald Haas and how it works by transmitting data through light intensity variations too fast for the human eye to detect. Section 2 introduces Li-Fi and how it uses LED bulbs to transmit digital 1s and 0s. Section 3 discusses the development of Li-Fi by Dr. Haas in 2011. Section 4 explains how Li-Fi works by modulating LED light and can achieve speeds over 500 megabytes per second. Section 5 compares Li-Fi to Wi-Fi, noting Li-Fi uses light instead of radio waves. Section 6 outlines several application areas of Li-Fi such as
The document is a PowerPoint presentation on Li-Fi technology. It introduces Li-Fi as a visible light communication system that can provide wireless internet access using LED bulbs. The presentation explains that Li-Fi uses LED bulbs that rapidly switch on and off to transmit digital signals, allows for faster data transfer than Wi-Fi, and provides several advantages like free spectrum and more secure communication. It also discusses the principles, construction, applications and comparisons of Li-Fi and highlights some challenges like light not passing through obstacles.
Li-Fi is a new wireless technology which provides the connectivity within 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. One germen phycist-Prof Harald Haas an expert in optical wireless communications at the University of Edinburgh, he demonstrated how an LED bulb equipped with signal processing technology could stream a high-definition video to a computer. By using this technology a 1 watt LED light bulb would be enough to provide net connectivity to four computers. This technology termed as "light fidelity". This technology allows us to transfer data more securely with higher data rates. This technology is still under research and further exploitation could lead to wide applications.
Li-Fi is a new technology that uses visible light communication and light-emitting diodes (LEDs) to transmit data wirelessly. It was introduced by physicist Harald Haas and provides data rates faster than Wi-Fi. Li-Fi uses LED light bulbs that vary in intensity faster than the human eye can detect to transmit data. It has advantages over Wi-Fi such as higher capacity, higher efficiency, greater availability, and better security since light cannot pass through walls.
This document discusses the technology of Li-Fi (Light Fidelity), which is a wireless communication system that uses light from LED bulbs to transmit data. It provides an introduction to Li-Fi, discussing how it works by modulating the intensity of LED light to transmit digital signals. The document then gives a brief history of Li-Fi, covering its development from 2004 onward by Professor Harald Haas. It also outlines some of the key advantages of using visible light over radio waves for wireless communication.
Li fi(light fidelity)-the future technology in wirelessakshay_panchal
This document discusses Li-Fi technology, which uses visible light communication to transmit data wirelessly. It provides an introduction to Li-Fi, including its history developed by Professor Harald Haas. Li-Fi works by varying the rate at which LED lights flicker on and off to transmit digital data. Compared to Wi-Fi, Li-Fi has advantages like higher speed, more bandwidth availability, more secure communication, and lack of interference. Potential applications of Li-Fi discussed include use in education systems, hospitals, aircraft internet access, and areas where other wireless technologies are banned. While Li-Fi does not pass through objects and can be interrupted by external light sources, it represents a promising future technology for wireless communication if developed
Seminar Report On Implementation Of Li-FI TechnologyAnjeet Kumar
Li-Fi is a wireless communication technology that uses light from LED bulbs to transmit data. The document discusses the history and development of Li-Fi technology. It provides details on how Li-Fi works by rapidly varying the intensity of LED light to transmit binary data. The document also discusses applications of Li-Fi technology in various sectors like hospitals, vehicles, and power plants.
Li-Fi is a new technology that uses visible light communication (VLC) to transmit data through LED light bulbs. It works by varying the intensity of light faster than what the human eye can detect. Li-Fi offers several advantages over traditional Wi-Fi, including higher capacity, better availability, higher security, and energy efficiency. It could help meet the rapidly increasing demand for wireless data as radio spectrum becomes more congested. If developed further, Li-Fi technology would allow wireless internet access from every light bulb.
Li-Fi is a technology that uses light from LED bulbs to transmit data wirelessly. It provides several advantages over traditional Wi-Fi including very high speeds, low energy consumption, secure transmission that cannot pass through walls, and the ability to be used in places where radio waves cannot reach. The technology works by switching the state of LED bulbs on and off very quickly in order to transmit binary code. It is still an emerging technology but has already been demonstrated to work at speeds over 10Mbps. Potential applications include use in street lights, hospitals, airplanes, and underwater.
This document provides an overview of Li-Fi technology through a presentation on the topic. It discusses the history of Li-Fi, how it works by transmitting data through LED light, its advantages over Wi-Fi such as higher bandwidth and more secure communication through visible light. Example applications are given such as using traffic lights and street lamps to transmit data. Challenges for Li-Fi are also noted, such as the need for line of sight transmission and potential interference from other light sources.
Li fi wireless optical networking technologySandeep Kadav
This document provides an overview of Li-Fi technology. It describes Li-Fi as a fast, optical version of Wi-Fi that uses LED lights to transmit data wirelessly. The technology was invented in 2011 by German physicist Harald Hass. Li-Fi offers higher data transfer rates and more security than Wi-Fi, works in dense environments, and has potential applications in hospitals, airlines, and underwater. However, Li-Fi faces limitations in not being able to pass through solid objects and potential interference from other light sources. Overall, the document argues that if developed, Li-Fi could provide internet connectivity anywhere there is light.
The document presents on Li-Fi technology. It discusses that Li-Fi uses LED lights to transmit data wirelessly similar to Wi-Fi. The history of wireless technology and Li-Fi is explained, including its invention in 2011. Current applications of Li-Fi are in traffic lights, hospitals and airplanes where radiowaves are restricted. Challenges of Li-Fi include interference from other light sources and difficulty transmitting signals through opaque objects. The conclusion is that if developed further, Li-Fi could provide wireless internet access from any light source.
A presention on LIFI technology..
Use MS Office 13 to view the original fonts and pics used within(as they are not supported in the previous versions..)
This document discusses Li-Fi technology, which uses LED light bulbs to transmit data by varying the intensity of light faster than what the human eye can detect. Li-Fi was pioneered in the 1990s and demonstrated by Harald Haas in 2011. It provides several advantages over Wi-Fi such as higher speed potential and no interference with radio frequencies. Li-Fi works by encoding binary data in the on-off states of an LED and can achieve speeds of over 100 Mbps. Potential applications include use in planes, hospitals, and as public internet hotspots through street lamps. However, challenges include light not passing through solid objects and interference from other light sources.
1. The document discusses a new technology called Li-Fi that transmits data through LED light bulbs by varying the intensity of light faster than the human eye can detect. This allows for wireless internet access through light.
2. One inventor, Dr. Harald Haas, developed this technology called "Data Through Illumination" which he claims can transmit data faster than average broadband speeds. He envisions wireless internet access for devices through light in a room.
3. The technology works by varying the intensity of LED lights to transmit binary code for "0" and "1" much like how infrared remote controls work but at higher speeds and amounts of data. This could provide wireless internet access through normal light in homes
This document summarizes a student's seminar presentation on Li-fi technology. It provides background on Li-fi, which transmits data through LED light bulbs that vary in intensity faster than the human eye can detect. The student discusses the technology's development, including its public demonstration in 2011. He notes researchers have achieved data rates over 500 MBPS. The document surveys the technology's potential applications and advantages over Wi-Fi, such as higher speeds and more secure transmission that cannot be accessed without line of sight to the light source.
This document provides an overview of Li-Fi technology in 12 sections. It begins with an abstract discussing how Li-Fi works by transmitting data through LED light bulbs that vary intensity faster than the human eye can detect. Section 4 explains that Li-Fi encodes data by flickering LEDs on and off at extremely high speeds to transmit binary data through light. Li-Fi has achieved speeds over 500 megabytes per second in labs and has potential for speeds over 10 gigabits per second. The document provides details on the history, workings, advantages and applications of Li-Fi technology.
Ashish Kumar Baghel and Chandraprakash Verma presented on Li-Fi technology at the Oriental Institute of Science and Tech in Bhopal on March 13, 2013. Li-Fi uses visible light communication to transmit data through LED bulbs that can switch on and off faster than the human eye can detect. The technology was pioneered in the 1990s by researchers in Germany, Korea, and Japan. Harald Haas continues advancing Li-Fi which could help address the congestion issues with radio spectrum as data demands double each year. Li-Fi has potential applications in traffic lights, intrinsically safe environments, and as public internet hotspots using street lamps. While still developing, Li-Fi shows promise to enable wireless
In simple terms, Li-Fi can be thought of as a light-based Wi-Fi. That is, it uses light instead of radio waves to transmit information. And instead of Wi-Fi modems, Li-Fi would use transceiver-fitted LED lamps that can light a room as well as transmit and receive information. Since simple light bulbs are used, there can technically be any number of access points.
This technology uses a part of the electromagnetic spectrum that is still not greatly utilized- The Visible Spectrum. Light is in fact very much part of our lives for millions and millions of years and does not have any major ill effect. Moreover there is 10,000 times more space available in this spectrum and just counting on the bulbs in use, it also multiplies to 10,000 times more availability as an infrastructure, globally.
The document summarizes a seminar report submitted by Pragnya Dash on Li-Fi (Light Fidelity) technology. It provides an introduction to Li-Fi, describing how it was developed by scientists including Dr. Gordon Povey and Prof. Harald Haas at the University of Edinburgh. Li-Fi uses visible light communication through LED bulbs to transmit data wirelessly, with the potential for higher speeds than traditional Wi-Fi networks that use radio waves. The document discusses the genesis of Li-Fi technology and how it works, as well as potential applications and advantages over Wi-Fi such as increased capacity and security.
Li-Fi light fidelity is an outcome of twenty first century research. It is a 5G visible light communication system that uses light from light-emitting diodes (LED's) as a medium to deliver networked, mobile, high-speed communication in a similar manner as Wi-Fi.
LiFi uses LED bulbs to transmit data using visible light, while WiFi uses radio waves transmitted via routers. LiFi has no interference issues, transfers data faster up to 1 Gbps, and provides more secure transfers since light is blocked by walls. However, WiFi has a longer coverage distance of about 32 meters while LiFi only reaches around 10 meters. Both technologies find applications in internet access, with LiFi suitable for dense environments like airplanes and hospitals due to its lack of interference.
This document discusses Li-Fi, a technology that uses light from LED bulbs to transmit data wirelessly. Li-Fi was invented in 2012 by German physicist Harald Haas and provides data transfer speeds over 1Gbps by using visible light, which is thousands of times faster than Wi-Fi's maximum speed of 54Mbps. Li-Fi overcomes many issues with radio waves like limited capacity, inefficiency, security, and availability by using visible light that is present everywhere and does not penetrate walls. It is considered a proven technology as the inventor demonstrated successful data transmission exceeding 10Mbps using an ordinary table lamp.
Li-Fi is the term some have used to label the fast and cheap wireless-communication system, which is the optical version of Wi-Fi. The term was first used in this context by Harald Haas in his TED Global talk on Visible Light Communication(VLC). The technology was demonstrated at the 2012 Consumer Electronics Show in Las Vegas using a pair of Casio smartphones to exchange data using light of varying intensity given off from their screens, detectable at a distance of up to ten meters. For more recent trends in electronics please visit radeshyamece.blogspot.com
Visible light communication (sending data through light)slmnsvn
This document contains an outline for a thesis on visible light communication (VLC). It begins with acknowledgments and then provides a table of contents and lists of figures and tables. In the introduction, it states that VLC can solve problems with other communication systems like limited transmission power, security, and data rates. It discusses the objectives of building and testing a VLC circuit. It highlights advantages of VLC such as security, bandwidth, and ubiquity. The literature review covers applications of VLC like indoor lighting networks and vehicle-to-infrastructure communication. It also discusses VLC standards and the author's previous relevant coursework.
At the heart of this technology, a new generation of high-brightness light-emitting diodes. Very simply, if the LED is ON, user can transmit a digital string of 1, if it’s OFF then user can transmit a string of 0. It can be switched ON and OFF very quickly, which gives instant opportunity for transmitting data. It is possible to encode data in the light by varying the rate at which the LEDs flicker ON and OFF to pass different strings of 1s and 0s. The modulation is so fast that the human eye doesn’t notice. There are over 14 billion light bulbs used across the world, which needs to be replaced with LEDs ones that transmit data.
This document contains information on 7 LIFI technology projects from 2015. The projects focused on using visible light communication for eco-friendly data transmission, smart home automation, security systems, indoor broadcasting, dimming controls, mobile communications, and transmitting biomedical signals. The training office for these projects is listed as Spiro Solutions Pvt. Ltd. in Vellore, India.
This presentation introduces Li-Fi technology. It discusses how Li-Fi works by transmitting data through LED light bulbs that vary intensity faster than the human eye can detect. This allows for high-speed wireless communication. The presentation compares Li-Fi to Wi-Fi, noting Li-Fi's higher speeds and security. Potential applications of Li-Fi discussed include use in traffic lights, hospitals, airplanes, and underwater. Challenges of Li-Fi include not working through opaque objects and requiring line of sight. The presentation concludes that Li-Fi could revolutionize wireless communication.
Magnetic levitation uses magnetic fields to suspend objects without physical contact. Superconductors that conduct electricity with zero resistance can be used to levitate trains through magnetic fields. When superconductors are cooled below their critical temperature using liquid nitrogen, they are diamagnetic and repel magnetic fields. Maglev trains use superconducting magnets cooled by liquid helium or nitrogen to levitate above guideways through electromagnetic propulsion and braking systems, allowing for contactless travel at speeds over 500 km/h.
This seminar report discusses LiFi (Light Fidelity) technology, which uses visible light communication to transmit data wirelessly. It provides an introduction to LiFi, explaining how it works using light-emitting diodes (LEDs) that vary in intensity faster than the human eye can detect. The report covers the history and development of LiFi, current research progress achieving speeds over 500 Mbps, and future areas of research to further improve the technology. Standardization efforts are also ongoing to develop standards for LiFi through organizations like IEEE and VLCC.
Li-Fi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission. It was invented by Harald Haas and is a safer, more energy efficient alternative to Wi-Fi. Li-Fi uses visible light communication and is 100 times faster than Wi-Fi. It has wide applications for places that prohibit radio waves like hospitals and aircraft. Li-Fi transmits data through rapid pulses of light by switching LED bulbs on and off faster than the human eye can detect. It has potential for speeds over 10Gbps and is being developed as the next-generation wireless optical network technology.
Li-Fi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission. It can provide higher speeds than Wi-Fi and has a number of advantages including increased capacity, energy efficiency, and enhanced security compared to traditional radio-frequency wireless networks. Li-Fi is a subset of visible light communication (VLC) and works by modulating the intensity of light from an LED to transmit data to a photodetector. This allows bidirectional communication in a similar manner to Wi-Fi networks.
Li-Fi (Light Fidelity)-The future technology In Wireless communicationAbdul Moiz Dota
This document summarizes research on a new wireless communication technology called Li-Fi, which stands for Light Fidelity. Li-Fi uses light-emitting diodes (LEDs) that can be switched on and off faster than the human eye can detect to transmit data by varying the intensity of light. One researcher, Harald Haas, has demonstrated speeds over 10 megabits per second by transmitting data through a LED light bulb. Researchers in Germany have achieved speeds over 500 megabytes per second using white LEDs. Li-Fi has several advantages over traditional Wi-Fi including potentially higher speeds, more available bandwidth since it uses light rather than radio frequencies, and more secure transmission since light cannot pass through walls. The technology is
lifi-technology with integration of IOT.pptxsomshekarkn64
The document discusses the technology of LiFi (Light Fidelity), which uses light from LED bulbs to transmit data wirelessly. It was invented by Professor Harald Haas and the first prototype was shown in 2014. LiFi uses visible light and infrared spectrum instead of radio frequencies for connectivity. It has several advantages over WiFi like better security, higher bandwidth potential, and no interference. However, light cannot pass through obstacles and the technology has high installation costs. The document examines how LiFi works, its differences from WiFi, applications, advantages and disadvantages to understand this new wireless connectivity method.
This document provides an overview of LiFi technology. It discusses the history of wireless networks and how they currently rely on radio waves. It then introduces LiFi as a new technology that transmits data through light instead of radio waves. It describes the components and working of LiFi, including how LED lights can be flickered at high speeds to transmit digital data. It compares LiFi to WiFi, discussing LiFi's advantages like higher speeds, more security, and greater available bandwidth. Potential applications and conclusions about LiFi solving bandwidth issues are also presented.
Li-Fi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission. It was introduced by German physicist Harald Haas as a solution to the limited bandwidth of Wi-Fi networks. Li-Fi uses visible light communication and is capable of much faster data transmission speeds than Wi-Fi. It works by varying the rate at which LEDs flicker on and off to encode digital information in light pulses, which are then detected by a photodetector. Li-Fi offers advantages over Wi-Fi such as a larger usable bandwidth, more secure communications, and energy efficiency.
LI-FI is a new technology that uses LED lighting to transmit data wirelessly at very high speeds up to 1Gbps, which is faster than Wi-Fi. It works by varying the intensity of the LED light which can be detected by photodetectors and converted back into data. LI-FI provides more secure and localized transmission than Wi-Fi since light cannot pass through walls. It has applications in places where Wi-Fi signals are restricted like hospitals and aircraft. However, LI-FI also faces challenges as the user must be within sight of the LED transmitter for connectivity.
The document discusses Li-Fi, a new wireless communication technology that uses visible light communication (VLC) to transmit data using LED lights. It provides several key advantages over traditional Wi-Fi such as higher speeds of up to 10,000 times more than Wi-Fi, improved security since light cannot pass through walls, and no interference issues. Li-Fi works by flickering LED lights on and off at a rate undetectable to the human eye to transmit binary data. It has various applications such as internet access anywhere there is light, use in hospitals where Wi-Fi radiation is unsafe, and underwater communications where radio waves don't work.
A German physicist named Harald Haas developed a wireless communication technology called Li-Fi that uses light-emitting diodes (LEDs) to transmit data. Li-Fi works by varying the intensity of LED light faster than what the human eye can detect, allowing binary digits to be transmitted. Researchers have achieved data rates over 500 megabytes per second in the lab using Li-Fi. Li-Fi has advantages over traditional Wi-Fi as it is not susceptible to interference and can be used in places where radio waves cannot like on airplanes or underwater. The technology has potential for use in public internet access points using street lights or personal devices transmitting data through ambient light.
This document summarizes a presentation on Li-Fi technology. It begins with an introduction and overview of Li-Fi, noting that it uses visible light communication and LED bulbs to transmit data. It then discusses the history of Li-Fi, including the first public demonstration in 2011. The document outlines the basic working process and construction of Li-Fi systems. It compares Li-Fi to Wi-Fi and discusses some applications. The document also briefly mentions security benefits and challenges facing Li-Fi development, such as the need for line of sight transmission. It concludes by stating that Li-Fi could provide a high-speed wireless alternative to congested radio frequencies.
Li-Fi can be thought of as a light-based Wi-Fi. That is, it uses light instead of radio waves to transmit information. And instead of Wi-Fi modems, Li-Fi would use transceiver-fitted LED lamps that can light a room as well as transmit and receive information. Since simple light bulbs are used, there can technically be any number of access points.
The document provides an overview of Li-Fi technology, which uses visible light communication to transmit data wirelessly using LED bulbs. It discusses how Li-Fi works by transmitting data through small changes in the intensity of light that are undetectable to the human eye. Li-Fi provides higher bandwidth, efficiency, availability and security compared to traditional Wi-Fi networks. The document also outlines some of the advantages of Li-Fi such as higher speeds of up to 224 gigabits per second, more available spectrum than radio frequencies, improved security since light cannot pass through walls, and its ability to be used in places where Wi-Fi signals cannot reach or are restricted.
1. Li-Fi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission. It can provide much higher speeds than Wi-Fi and has potential applications in areas where radio frequencies are regulated.
2. Li-Fi works by varying the intensity of light from an LED to transmit digital data. Researchers have achieved speeds over 500 Mbps in the lab. Potential advantages include abundant bandwidth and more secure localized transmission.
3. Key applications of Li-Fi include use in medical facilities, aircraft, and power plants where radio frequencies are restricted but high-speed connectivity is still needed. When combined with solid-state lighting infrastructure, Li-Fi could provide a cheaper alternative to
LiFi is a wireless communication system that uses light-emitting diodes (LEDs) to transmit data by varying the intensity of light faster than the human eye can detect. It provides a high-speed wireless alternative to WiFi by using visible light spectrum instead of radio frequencies. Researchers have achieved data rates over 500 megabytes per second in labs and demonstrated data exchange between phones at distances of up to 10 meters. LiFi uses LED light bulbs and fixtures to transmit data and has potential for speeds over 10 gigabits per second, allowing full movies to download in 30 seconds. It provides a secure and interference-free alternative to WiFi for places like aircraft and hospitals.
Li-Fi is a technology that uses light from LED bulbs to transmit data wirelessly. It works by varying the intensity of LED lights faster than the human eye can detect. This allows digital data to be transmitted through the LED. Li-Fi was pioneered in the 1990s and provides higher data rates, more security, and energy efficiency compared to traditional Wi-Fi. It can be used in places where Wi-Fi signals cannot reach or are restricted, such as on aircraft or underwater. While Li-Fi has advantages over Wi-Fi, it also has disadvantages like higher installation costs and inability to pass through opaque objects.
LI-FI stands for “Light Fidelity”.
It is the transmission of data through illumination ,sending data through a Light Emitting Diode which varies in intensity faster than human eye can follow to deliver high speed data transmission.
Advantages of LI-FI
Higher Bandwidth (almost 10000 times more)
Availability
Efficiency
High Security
Easy to use
Fast data transfer
Harmless
Low cost
High capacity
Design, Working, Challenges, Applications, Advantages and Disadvantages of Li...ijtsrd
This document discusses Li-Fi (Light Fidelity) technology, which uses visible light communication and LED lights to transmit data wirelessly. It describes the design, working, challenges, applications, advantages and disadvantages of Li-Fi compared to existing Wi-Fi technology. Key points include that Li-Fi has faster speeds than Wi-Fi, uses light which has a larger bandwidth than radio frequencies, provides more secure data transmission since light cannot pass through walls, and has growing applications in areas like aviation, smart homes and hospitals. However, it also faces challenges such as limited range and requiring line of sight between devices.
Li-Fi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission. It can provide higher speeds than Wi-Fi and has a larger bandwidth of unused spectrum. Li-Fi works by varying the intensity of light from an LED to transmit data and can provide speeds over 100 Mbps. It offers several advantages over Wi-Fi including better security since the signal cannot pass through walls, no interference with other devices, and it is safer for use in environments like hospitals where Wi-Fi is restricted. Potential applications of Li-Fi include use on airplanes, smarter lighting that acts as internet hotspots, and undersea communication where radio signals cannot reach.
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1. UNIVERSITY OF INFORMATION TECHNOLOGY &SCIENCES
.
Study Paper on
Li-Fi Technology
[The latest technology in wireless]
Submitted By :
Showrav Mazumder
ID : 10530053
Md.Mozahid Hossain
ID : 11330336
Submitted To: Joya Das
(Lecturer of UITS)
Page : 08-03-2014
Date of Submission 0 of 19
CSE
2. Abstract
For the vast increasing gadgets, their usage and developments led to the progression of
Wi-Fi which provides a latest technology, it’s called Li-Fi. Li-Fi is a latest technology
that makes use of LED light which helps in the transmission of data much more faster
and flexible than data that can be transmitted through Wi-Fi. Light reaches nearly
everywhere so communication can also go along with light easily. Light Fidelity is a
branch of optical wireless communication which is an emerging technology. By using
visible light as transmission medium, Li-Fi provides wireless indoor communication. The
bit rate achieved by Li-Fi cannot be achieved by Wi-Fi. Prof. Dr. herald Haas, the
professor of mobile communications at the University of Edinburgh, UK, first time
publically displayed the proof of Light Fidelity(Li-Fi), a method of Visible Light
communication(VLC). Li-Fi is the transfer of data through light by taking fiber out of
fiber optics and sending data through LED light.
1
3. Contents
Page
1. Introduction……………………………………………………………... 3
2. History…………………………………………………………………... 4
2.1. Present scenario …………………………………………………………… 5
3. Working Technology …………………………………………………... 6
3.1. Basic Concept ..………………………………………………………...... 6
3.2. How it’s works …………………………………………………………..... 6
3.3. Data Transmission ………………………………………………………… 7
3.4. Why Visible Light Communication ………………………………............. 7
3.5. Design of Li-Fi ………………………………………………………….. 8
3.6. What Makes A Fiber Optics Cable……………………………………..... 8
3.7. Implementation ………………………………………………………….. 9
4. Applications …………………………………………………………... 11
5. Features ..…………………………………………………………….... 15
6. Limitations….………………………………………………………..... 16
6.1. Comparisons ………………………………………………................ 16
7. Conclusion…………………………………………………………….. 18
8. References………………………………………………………….…. 19
2
4. Introduction
Li-fi basically known as ―light fidelity‖ is an outcome of twenty first century. The basic
ideology behind this technology is that the data century. The basic ideology behind this
technology is that the data can be transmitted through LED light whose intensity varies
even faster than the human eye. As the transmission of the data takes place through the
light emitting diodes (LED’s) the amount is comparatively small .In modern times, it is
called as the optimized version of WI-FI . In simple terms, Li-Fi can be thought of as a
light-based Wi-Fi. That is, it uses light instead of radio waves to transmit information.
And instead of Wi-Fi modems, Li-Fi would use transceiver-fitted LED lamps that can
light a room as well as transmit and receive information. Since simple light bulbs are
used, there can technically be any number of access points. This technology uses a part of
the electromagnetic spectrum that is still not greatly utilized- The Visible Spectrum.
Light is in fact very much part of our lives for millions and millions of years and does not
have any major ill effect. Moreover there is 10,000 times more space available much
more. The technology truly began during the 1990's in countries like in this spectrum and
just counting on the bulbs in use, it also multiplies to 10,000 times more availability as an
infrastructure, globally. The advantageous thing is the wireless communication which
decreases the cost enormously. HARALD HASS, who is considered to be the father of
Li-fi from university of Edinburgh, UK says that the heart of this technology lies in the
intensity and the potential of the light emitting diodes. The major reason which lead the
modern man through this invention is that the confinement of Wi-Fi to comparatively
small distance. As there are more and more devices coming up day-by-day the signals are
being clogged up due to heavy traffic, there arise a need for an error free transmission
technology. And the solution to this problem was the Li-fi technology. It has been
designed in such a way that it overcomes the disadvantages that occurs during the usage
of Wi-Fi. In general terms, Li-fi works even under water thereby causing a great benefit
to the military operations. The physicists envisions that this technology would make a
great difference between the assumption and the proof in this case. The demonstration
took place using two Casio smart phones. The data was made to exchange between the
phones using light. Even though the distance was nominal, it is sure that there would be a
rapid increase in the distance of transmission. As there is a limited amount of Radio
based wireless spectrum available a number of companies formed a consortium called
Li-fi consortium in order to promote high speed optical wireless systems. The members
of this consortium believes that a speed of 10Gbps can be achieved in no time. If this
would be possible then a high clarity image would take about 30 seconds to download!!
3
5. History
Professor Harald Haas, from the University of Edinburgh in the UK, is widely
recognized as the original founder
of Li-Fi. Harald haas continues to
hit the world that there is a
possibility for communication
through light.LI-FI technology has
the possibility to change how we
access the internet, stream videos,
receive emails and much more.
The technology truly began during
the 1990's in countries like
Germany, Korea, and Japan where
they discovered LED's could be
retrofitted to send information.
This type of light would come in
Fig : Prof. Harald Hass
familiar forms such as infrared,
ultraviolet and visible light. Research
into VLC has been conducted in earnest since 2003, mainly in the UK, US, Germany,
Korea and Japan. Experiments have shown that LEDs can be electronically adapted to
transmit data wirelessly as well as to provide light. VLC is faster, safer and cheaper than
other forms of wireless internet, advocates say -- and so could eliminate the need for
costly mobile-phone radio masts Haas has a small lab stuffed with equipment, including
the now-famous table lamp and its box of electronics. It was here in 2007 that his
research assistant, Mostafa Afgani, first sent data using light signals. Haas's invention
centuries on how these signals are modulated: the information, embedded within visible
light emitted from the LEDs, is transmitted by means of many subtle changes made to the
intensity of the light at the ultra-high rate of 100 million cycles per second (100MHz).
The photo-detector in Haas's box monitors these tiny variations and converts them back
into a digital signal, from which the transmitted information is extracted. In October 2011
a number of companies and industries formed the Li-Fi Consortium, to promote highspeed optical wireless system sand to enhance the limited bandwidth provided by radiobased light communication is this method of using rapid pulses of light to transmit
information wirelessly.
4
6. 2.1. Present scenario
At present we have as many as 1.5 million radio wave base stations across the
globe.
We also have close to 5 billion mobile connections which transmit a data over
600TB.
1.5 million
5 billion
Figure-1: The present scenario.
This penetration of mobile devices into our lives has led to a wide recognition of
WI-FI technology.
Radio Spectrum is congested but the demand for wireless data double each year
.Everything, it seems want to use wireless data but the capacity is drying up.
So what can carry this excess demand in the future.
5
7. 3. Working Technology
Basic Concept:
Li-Fi technology is a wireless communication system based on the use of visible light
between the blue (670 THz) and red (480 THz). Unlike Wi-Fi which uses the radio part of
the electromagnetic spectrum, Li-Fi uses the optical spectrum. The principle of Li-Fi is
based on sending data by amplitude modulation of the light sources in a well-defined
and standardized way.
The principle is simple: the LED turns on and off at high speed and is not visible to
humans. This ribbon of on and off signals is interpreted to create binary streams of 0
and 1. Because there are no battling light frequencies like that of the radio frequencies
in Wi-Fi, Li-Fi is thought to be 80% more efficient. Which means it can reach speeds of
up to 1Gbps. Is this the future?
Li-Fi differs from fiber optic because the Li-Fi protocol layers are suitable for wireless
communication over short distances (up to ten meters). This puts Li-Fi in a unique
position of extremely fast wireless communication over short distances. The technology
has already attained IEEE standard certification and is currently being tested at the Â
Oledcomm head quarters  in France. It is expected that Li-Fi could be ready for use as
soon as 2014.
3.1. How it’s Works
The working procedure is very simple, if the light is on then transmit a digital 1, if it’s off
transmit a 0. The LEDs can be switched on and off very quickly which gives nice
opportunities for transmitting data.
Fig-2: Li-Fi works
6
8. `
Hence all that required is some LEDs and a controller that a code data into those LEDs.
All one has to do is to vary the rate at which the LEDs flicker depending upon the data
want to encode. Further enhancements can be made in this method , like using array of
the LEDs for parallel data transmission, or using mixtures of red , green and blue LEDs
to alter the light’s frequency with each frequency encoding a different data channel.
3.2. Data Transmission
As WI-FI hotspot and cloud computing are rapidly increasing reliable signal is bound to
suffer. Speed and security are also major concerns. They are vulnerable to hackers as it
penetrates through walls easily. LI-FI is said to overcome this. This new technology is
comparable to infrared remote controls which send data through an LED light bulb that
varies in intensity faster than the human eye can see. In near future we can see data for
laptops, smart phones and tablets transmitted through the light in a room. Li-Fi(Light
Fidelity) is a fast and cheap optical version of Wi-Fi, the technology of which is based
on Visible Light Communication(VLC).
3.3. Why Visible Light Communication
At first Radio waves, its expensive and less secure. Infrared, due to eye safety regulation
can only base with low power. Gama rays can not be used as they could be dangerous.
Ultraviolet light is good for place without people, but otherwise dangerous for the human
body.
Radio
Waves
Infrared
Rays
Gama
Rays
Ultraviolet
Rays
X- Rays
Visible
Rays
Fig-3: Why only VLC [ Visible light Communication].
But, Visible rays is safe to use larger bandwidth.
VLC is a data communication medium, which uses visible light between 400 THz (780
nm) and800 THz (375 nm) as optical carrier for data transmission and illumination. Fast
pulses are used for wireless transmission. Communication system components are:
7
9. 1. A high brightness white LED which acts as a communication source.
2. Silicon photo diode which shows good response to visible wavelength region.
LED illumination can be used as a communication source by modulating the LED light
with the data signal. The LED light appears constant to the human eye due to the fast
flickering rate. The high data rate can be achieved by using high speed LED’s and
appropriate multiplexing techniques. Each LED transmits at a different data rate which
can be increased by parallel data transmission using LED arrays. Many different reasons
exist for the usage of LED light in spite of fluorescent lamp, incandescent bulb etc which
are available.
3.4. Design of Li-Fi
Li-Fi architecture consists numbers of Led bulbs or lamps, many wireless devices
such as PDA, Mobile Phones, and laptops. Important factors we should consider while
designing Li –Fi as following:
1. Presence of Light must be line-of-sight.
2. Lamp driver where internet connection, switch and LED lamp connected.
3. For better performance use LED bulbs.
4. A photo detector received data.
3.5. What Makes A Fiber Optics Cable
Typically, fiber optic cables are made up of various parts depending on what cable I
want. To better understand, imagine looking at a bulls-eye, the outer most circle would
be the cable jacket or what you see on the outside of a fiber optic cable. The core is where
the data is sent as light from one end of the cable to another. One key important fact is
that the light is reflected off of mirrors inside the cable which helps get the light waves to
its destination.
.
8
10. Fig -4: Using Fiber Optics Cable.
Generally, fiber optic cables are wires that transmit data. through an extremely thin layer
layers of glass or plastic threads. These threads are the actual fibers in a fiber optic
cable. The relationship to LI-FI technology is in the regard that data travels through
the fiber in the form of light which is then translated into 1's and 0's, the data part. One
of the key advantages to using light as a data transmitter is its massive bandwidth
which is what makes fiber optics popular today. However, fiber optics are notoriously
expensive but may soon replace most existing traditional metal cables.
3.6. Implementation
Li-Fi is typically implemented using white LED light bulbs at the downlink transmitter.
These devices are normally used for illumination only by applying a constant current
9
11. Fig-5: Implementation of Li-Fi.
However, by fast and subtle variations of the current, the optical output can be made to
vary at extremely high speeds. This very property of optical current is used in Li -Fi
setup.
Fig -6: Architecture of Li-Fi
Implementation of Li-Fi given in the figure. In figure a internet connection is connected
to the lamp driver . A switch connected with lamp driver and LED lamp also connected
this lamp driver through fiber optics cable. Now a receiving device named photo detector
is using for receive signal and processing , this device is connected with PC or Laptop’s
LAN port. On one end all the data on the internet will be streamed to a lamp driver when
the LED is switched on the microchip converts the digital data in form of light. The light
sensitive device photo detector receives the signal and converts it back into original data.
This method of using rapid pulses of light to transmit information wirelessly is
technically referred as Visible Light Communication.
10
12. 4. APPLICATIONS
There is a wide necessity for data transfer and by the end of the day every field involves
the use of technologies.one such technology is Li-Fi which can have its applications
extended in areas where the Wi-Fi technology lack its presence like medical technology,
power plants and various other areas where Li-Fi proved it excellence of the undersea
awesomeness.
Spectrum Relief:
Excess capacity demands of cellular networks can be off-loaded to Li-Fi networks where
available. This is especially effective on the downlink where bottlenecks tend to occur.
Mobile Connectivity:
Laptops, smart phones, tablets and other mobile devices can interconnect directly using
Li-Fi. Short range links give very high data rates and also provides security.
Hazardous Environments: Li-Fi provides a safe alternative to electromagnetic
interference from radio frequency communications in environments such as mines and
petrochemical plants.
Aviation:
Li-Fi can be used to reduce weight and cabling and add flexibility to seating layouts in
aircraft passenger cabins where LED lights are already deployed. In-flight entertainment
(IFE) systems can also be supported and integrated with passengers’ own mobile devices.
Underwater Communications:
Due to strong signal absorption in water, RF use is impractical. Acoustic waves have
extremely low bandwidth and disturb marine life. Li-Fi provides a solution for shortrange communications.
Reduction in accident numbers: LED headlights and tail-lights are being
introduced. At traffic signals, we can use LIFI in
order to communicate with LED lights of the cars by the number of accidents can be
reduced. Data can be easily transferred by making use of LIFI lamps with the street
lamps. This can be used for vehicle-to-vehicle and vehicle-to-roadside communications.
This can be applied for road safety and traffic management.
11
13. RF Avoidance:
Some people claim they are hypersensitive to radio frequencies and are looking for an
alternative. Li-Fi is a good solution to this problem.
Location Based Services (LBS):
Highly accurate location-specific information services such as advertising and navigation
that enables the recipient to receive appropriate, pertinent information in a timely manner
and location.
Airlines:
Airline Wi-Fi, nothing says captive audience like having to pay for the "service" of dialup speed Wi-Fi on the plane. And don’t get me started on the pricing. The best so far is
that passengers will "soon" be offered a "high-speed like" connection on some
airlines. United is planning on speeds as high as 9.8 Mbps per plane. Twice that
capacity in my living room. And at the same price as checking a bag, Li-Fi could easily
introduce that sort of speed to each seat's reading light.
Smarter Power Plants:
Wi-Fi
and many other radiation types are bad for sensitive areas. Like those surrounding power
plants. But power plants need fast, inter-connected data systems to monitor things like
demand, grid integrity and (in nuclear plants) core temperature. The savings from
proper monitoring at a single power plant can add up to hundreds of thousands of
dollars. Li-Fi could offer safe, abundant connectivity for all areas of these sensitive
locations. Not only would this save money related to currently implemented solutions,
but the draw on a power plant’s own reserves could be lessened if they haven’t yet
converted to LED lighting.
Education systems:
As with the advancement of science the latest technology is the LIFI which is the fastest
speed internet access service.so this will leads to the replacement of WIFI at institutions
and at companies so that all the people can make use of LIFI with same speed intended in
a particular area.
Usage-Models:
Within a local Li-Fi cloud several database services are supported through a
heterogeneous communication system. In an initial approach, the Li-Fi Consortium
defined different types of technologies to provide secure, reliable and ultra-high-speed
wireless communication interfaces. These, Technologies included Giga-speed
12
14. technologies, optical mobility technologies, and navigation, precision location and
gesture recognition technologies. For Giga-speed technologies, the Li-Fi Consortium
defined Giga Dock, Giga-Beam, Giga-Shower, Giga-Spot and Giga-MIMO models to
address different user scenarios for wireless indoor and indoor-like data transfers. While
Giga Dock is a wireless docking solution including wireless charging for smartphones,
tablets or notebooks, with speeds up to 10Gbps, the Giga Beam model is a point-to-point
data link for kiosk applications or portable-to-portable data exchanges. Thus a two-hour
full HDTV movie (5 GB) can be transferred from one device to another within four
seconds. Giga shower, Giga Spot and Giga- MIMO are the other models for in-house
communication. There a transmitter or receiver is mounted into the ceiling connected to,
for example, a media server. On the other side are portable or fixed devices on a desk in
an office, in an operating room, in a production hall or at an airport. Giga Shower
provides unidirectional data services via several channels to multiple users with gigabitclass communication speed over several maters. This is like watching TV channels or
listening to different radio stations where no uplink channel is needed. In case Giga
Shower is used to sell books, music or movies, the connected media server can be
accessed via Wi-Fi to process payment via a mobile device. Giga-Spot and Giga-MIMO
are optical wireless single- and multi-channel Hot-Spot solutions offering bidirectional
gigabit-class communication in a room, hall or shopping mall for example.
Extends our life span:
For a long time, medical technology has lagged behind the rest of the wireless world.
Operating rooms do not allow Wi-Fi over radiation concerns, and there is also that
whole lack of room. dedicated spectrum. While Wi-Fi is in place in many hospitals,
interference from cell phones and computers can block signals from monitoring
equipment. Li-Fi solves both problems: lights are not only allowed in operating
rooms, but tend to be the most glaring (pun intended) fixtures in the room. And, as
Haas mentions in his TED Talk, Li-Fi has 10,000 times the spectrum of Wi-Fi, so
maybe we can, I delegate red light to priority medical data. Code Red!
Replacement for others technologies:
This technology doesn’t deal with radio waves, so it can easily be used in the places
where Bluetooth, infrared, WIFI and Internet are banned. In this way, it will be most
helpful transferring medium for us. It includes other benefits like:
*A very wide spectrum over visible wave length range.
* Extremely high colour fidelity.
*Instant start time.
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15. *Easy terminal Management.
*Dynamic dark i.e. brightness Modulation of lamp output to enhance video contrast.
*Trouble-free integration into existing light engine platform.
Li-Fi is the upcoming and on growing technology acting as competent
for various other developing and already invented technologies. Since
light is d major source for transmission in this technology it is very advantageous and
implementable in various fields that can’t be done with
the Wi-Fi and other technologies. Hence the future applications of the
Li-Fi can be predicted and extended to different platforms like education
fields, medical field, industrial areas and many other fields.
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16. 5. Features
Li-Fi offers a number of key benefits over Wi-Fi but is inherently a complementary
technology.
5.1. Capacity
Bandwidth:
The visible light spectrum is plentiful (10,000 more than RF spectrum), unlicensed and
free to use.
Data density: Li-Fi can achieve about 1000 times the data density of Wi-Fi because
visible light can be well contained in a tight illumination area whereas RF tends to spread
out and cause interference.
High speed: Very high data rates can be achieved due to low interference, high device
bandwidths and high intensity optical output.
Planning: Capacity planning is simple since there tends to be illumination infrastructure
where people wish to communicate, and good signal strength can literally be seen.
5.2. Efficiency
Low cost: Requires fewer components than radio technology.
Energy: LED illumination is already efficient and the data transmission requires
negligible additional power.
Environment: RF transmission and propagation in water is extremely difficult but Li-Fi
works well in this environment.
Safety: Life on earth has evolved through exposure to visible light. There are no known
safety or health concerns for this technology.
Non-hazardous: The transmission of light avoids the use of radio frequencies which can
dangerously interfere with electronic circuitry in certain environments.
Security.
Containment: It is difficult to eavesdrop on Li-Fi signals since the signal is confined to a
closely defined illumination area and will not travel through walls.
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17. Control: Data may be directed from one device to another and the user can see where the
data is going; there is no need for additional security such as pairing for RF
interconnections such as Bluetooth.
6. Limitations of Li-Fi
The main problem is that light can’t pass through objects, so if the receiver is
inadvertently blocked in any way, then the signal will immediately cut out. ―If the light
signal is blocked, or when you need to use your device to send information — you can
seamlessly switch back over to radio waves‖, Harald says.
Reliability and network coverage are the major issues to be considered by the
companies while providing VLC services. Interference from external light sources like
sun light, normal bulbs; and opaque materials in the path of transmission will cause
interruption in the communication.
High installation cost of the VLC systems can be complemented by large-scale
implementation of VLC though Adopting VLC technology will reduce further operating
costs like electricity charges, maintenance charges etc.
This research report categorizes the global VLC technology market; based on
component, applications, and geography. Li-Fi uses light-emitting diodes (LEDs) which
are rapidly gaining in popularity for standard light bulbs and other domestic and
commercial purposes. They are expected to be ubiquitous in 20 years. VLC is not in
competition with Wi-Fi, Prof. Haas says, it is a complimentary technology that should
eventually help free up much needed space within the radio wave spectrum.
We still need Wi-Fi we still need radio frequency cellular systems. You can’t have a
light bulb that provides data to a high-speed moving object or to provide data in a
remote area where there are trees and walls and obstacles behind,‖ he says.
6.1. Comparison between Li-Fi / Wi-Fi
Li-Fi, an alternative to Wi-Fi that transmits data using the spectrum of visible light, has
achieved a new breakthrough, with UK scientists reporting transmission speeds of 10Gbit/s
– more than 250 times faster than ‘superfast’ broadband. Both Wi-Fi and Li-Fi transmit
data over the electromagnetic spectrum, but whereas Wi-Fi utilizes radio waves, Li-Fi uses
visible light. This is a distinct advantage in that the visible light is far more plentiful than the
radio spectrum (10,000 times more in fact) and can achieve far greater data density. It
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18. 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.
Below given a comparison table of Li-Fi and Wi-Fi
Fig- Table of Comparison between Li-Fi / Wi-Fi
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19. Conclusion
The Idea of Li-Fi technology currently attracting us a great deal of interest because it’s
latest and very efficient alternative to radio-based wireless technology. The possibilities
are numerous and can be explored further. If this technology can be put into practical
use, every bulb can be used something like a Wi-Fi hotspot to transmit wireless data and
we can proceed toward the cleaner, greener, safer and brighter future. As a growing
number of people and their many devices access wireless internet, the airwaves are
becoming increasingly clogged, making it more and more difficult to get a reliable, high
speed signal. This may solve issues such as the short age of radio frequency bandwidth
and also allow internet where traditional radio based wireless is not allowed such
as aircraft or hospitals. One of the shortcomings however is that it only work in direct
line of sight.
.
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20. References
1. http://en.wikipedia.org/wiki/Li-Fi
2.http://www.digplanet.com/wiki/Li-Fi.
3. the-gadgeteer.com/2011/08/29/Li-Fi-internet-at-the speed-of-light.
4. Wireless data from every light bulb Harald Haas, TED Global, Edinburgh, July 2011.
5. www.lificonsortium.org
6. www.macmillandictionary.com/buzzword/entries/Li- Fi.html
7. technopits.blogspot.comtechnology.cgap.org/2012/01/11/a-lifi-world/
8. ―Visible-light communication: Tripping the light fantastic: A fast and cheap optical version of Wi-Fi
iscoming‖,Economist, dated 28 Jan 2012
9.www.lificonsortium.org
10. seminarprojects.com/s/seminar-report-on-lifihttp://teleinfobd.blogspot.in/2012/01/what-is-lifi.html
11. advice.com/archives/2012/08/lifi-ten-ways-i.php
15. Will Li-Fi be the new Wi-Fi?, New Scientist, byJamieCondliffe, dated 28 July 2011
16. http://www.digplanet.com/wiki/Li-Fi.
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