Li-Fi uses visible light communication technology to transmit data wirelessly using light. It provides higher speeds and greater capacity than Wi-Fi. Li-Fi transmits data through LED bulbs by varying the intensity of light faster than what the human eye can detect. This allows transmitting digital signals through the illumination. Li-Fi offers solutions to issues with Wi-Fi like limited spectrum, security concerns, and availability. Products like Li-1st and Li-Flame have been developed providing speeds up to 10Mbps. Applications of Li-Fi include use in aircrafts, underwater environments, traffic management systems, and more.
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.
Li-Fi is a visible light communication technology that can provide wireless internet access at high speeds using LED light bulbs. It works by varying the intensity of LED lights faster than what the human eye can detect to transmit data. Researchers have achieved speeds over 500 megabytes per second in the lab. Li-Fi was pioneered by Professor Harald Haas and could offer connection speeds faster than most broadband internet access. It provides a safe and unlimited spectrum alternative to Wi-Fi for wireless connectivity indoors.
This document is a seminar report on Li-Fi (Light Fidelity) technology submitted by Vivek Kumar Jha. It includes an acknowledgement, certificate, contents, abstract, and sections on the introduction of Li-Fi, system design, present scenario of wireless communication, issues with radio waves, Li-Fi as an alternative, implementation of Li-Fi, overcoming issues, applications, and conclusion. The report provides an overview of Li-Fi technology which uses visible light communication through LED lights for wireless data transmission.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Muhammad Aman defended his MS thesis on designing, implementing, and analyzing a Li-Fi system in noisy environments. He presented work on proposing a Li-Fi model, simulating it, analyzing results, and modeling noise. Key findings included Li-Fi working up to 9m with a single LED, a maximum reception angle of 15 degrees, and the system retrieving signals distorted by 30% but requiring complex filtering for 50% distortion. Future work could develop hardware, enable duplex communication, and apply Li-Fi to power line communication.
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 stands for Light-Fidelity. Li-Fi is transmission of data using visible light by sending data through an LED light bulb that varies in intensity faster than the human eye can follow. If the LED is on, the photo detector registers a binary one; otherwise it‟s a binary zero. The idea of Li-Fi was introduced by a German physicist, Harald Hass, which he also referred to as “Data
through Illumination”. The term Li-Fi was first used by Haas in his TED Global talk on Visible Light Communication. According to Hass, the light, which he referred to as „DLight‟, can be used to produce data rates higher than 1 Giga bits per second which is much faster than our average broadband connection.
This Project discusses the implementation of the most basic Li-Fi based system to
transmit Sound signal from one device to another through visible light. The purpose is to demonstrate only the working of the simplest model of Li-Fi with no major consideration about the data transfer speed. This model will demonstrate how the notion of one-way communication via visible light works, in which Light emitting diodes (LEDs) are employed as the light sources or Transmitter antennas. the sound is transferred by light and is detected at the receiver without fading.
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.
Li-Fi is a visible light communication technology that can provide wireless internet access at high speeds using LED light bulbs. It works by varying the intensity of LED lights faster than what the human eye can detect to transmit data. Researchers have achieved speeds over 500 megabytes per second in the lab. Li-Fi was pioneered by Professor Harald Haas and could offer connection speeds faster than most broadband internet access. It provides a safe and unlimited spectrum alternative to Wi-Fi for wireless connectivity indoors.
This document is a seminar report on Li-Fi (Light Fidelity) technology submitted by Vivek Kumar Jha. It includes an acknowledgement, certificate, contents, abstract, and sections on the introduction of Li-Fi, system design, present scenario of wireless communication, issues with radio waves, Li-Fi as an alternative, implementation of Li-Fi, overcoming issues, applications, and conclusion. The report provides an overview of Li-Fi technology which uses visible light communication through LED lights for wireless data transmission.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Muhammad Aman defended his MS thesis on designing, implementing, and analyzing a Li-Fi system in noisy environments. He presented work on proposing a Li-Fi model, simulating it, analyzing results, and modeling noise. Key findings included Li-Fi working up to 9m with a single LED, a maximum reception angle of 15 degrees, and the system retrieving signals distorted by 30% but requiring complex filtering for 50% distortion. Future work could develop hardware, enable duplex communication, and apply Li-Fi to power line communication.
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 stands for Light-Fidelity. Li-Fi is transmission of data using visible light by sending data through an LED light bulb that varies in intensity faster than the human eye can follow. If the LED is on, the photo detector registers a binary one; otherwise it‟s a binary zero. The idea of Li-Fi was introduced by a German physicist, Harald Hass, which he also referred to as “Data
through Illumination”. The term Li-Fi was first used by Haas in his TED Global talk on Visible Light Communication. According to Hass, the light, which he referred to as „DLight‟, can be used to produce data rates higher than 1 Giga bits per second which is much faster than our average broadband connection.
This Project discusses the implementation of the most basic Li-Fi based system to
transmit Sound signal from one device to another through visible light. The purpose is to demonstrate only the working of the simplest model of Li-Fi with no major consideration about the data transfer speed. This model will demonstrate how the notion of one-way communication via visible light works, in which Light emitting diodes (LEDs) are employed as the light sources or Transmitter antennas. the sound is transferred by light and is detected at the receiver without fading.
1) 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 does not cause any radio interference.
2) Li-Fi works by varying the intensity of light from an LED to transmit data. An LED bulb acts as a transmitter and a photo-sensitive detector acts as a receiver. Data is encoded by switching the LED bulb on and off at extremely high speeds undetectable to the human eye.
3) Potential applications of Li-Fi include use in places where Wi-Fi is restricted like hospitals and aircraft, as well as enabling faster internet access in public places using street lights outfitted
Light Fidelity (Li-Fi) is a bidirectional, high speed , fully networked wireless communication technology similar to Wi-Fi. Li-Fi was first put forward by Professor Harald Haas,University of Edinburgh, during a TED Talk in 2011. Li-Fi is a form of visible light communication and a subset of optical wireless communications (OWC) and could be a complement to RF communication (Wi-Fi or Cellular network), or even a replacement in contexts of data broadcasting. It is so far measured to be about 100 times faster than some Wi-Fi implementations, reaching speeds of 224 gigabits per second.
Visible light communication uses LED lights to transmit data by varying the intensity of light. It offers several advantages over traditional wireless technologies like WiFi. Data can be transmitted through visible light at speeds higher than WiFi and without interfering with other wireless networks. It also provides a secure communication medium as light cannot pass through walls. While the technology is still being developed, it shows promise in helping overcome bandwidth limitations of existing wireless networks.
Visible light communication (VLC) uses visible light spectrum to transmit data wirelessly. It has several advantages over traditional wireless technologies like WiFi, including no interference with other devices, safety in medical settings, and ubiquitous availability with rising LED usage. Early experiments with VLC date back to 1880 with Alexander Graham Bell's photophone. Modern standardization efforts aim to avoid fragmentation and promote applications like indoor localization, smart retail, and vehicle-to-vehicle communication. Key challenges include increasing data rates and providing bidirectional communication capabilities. VLC remains an emerging technology but shows promise for a variety of uses.
This document is a project report submitted by four students (Niteesh Khanolkar, Sudhir Menon, Kaustubh Band, Chinmay Rane) for their Bachelor's degree. It discusses their project on visible light data transmission under the guidance of Prof. Archana Patil. The report includes an introduction to visible light communication, a literature review on the topic, a proposed system design, hardware and software requirements, features and applications of the system, and plans for future work.
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
Data transmission through visible light communication (li fi)Omkar Omkar
The document is a project report for a Digital Communication course that explores data transmission through visible light communication (VLC). It discusses two prototypes created by the students:
1. A VLC transceiver circuit that was able to transmit and receive data through an LED and photodiode. This demonstrated basic VLC functionality.
2. An audio transmission system using VLC that sent a song from a computer to a speaker using an LED and solar panel receiver.
The report also covers the characteristics of LEDs for VLC, modulation schemes like OFDM that could be used, challenges in implementing the hardware, and techniques for mitigating nonlinear distortion in LEDs. The overall goal was to research and prototype basic V
Lifi(Light fidelity)-Efficient use of visible spectruminventionjournals
ABSTRACT : LEDs are beginning to be used in every home and office which makes LED’s light ideal for ubiquitous data transmitter This means that everywhere where LEDs are used, lighting bulbs can bring not only the light but wireless connection at the same time. With increasing demand for wireless data, lack of radio spectrum and issues with hazardous electromagnetic pollution, LiFi is a new wireless communication technology which enables a wireless data transmission through LED light. LiFi appears as a new greener, healthier and cheaper alternative to WiFi. Li-Fi is the emerging area of technology is also known as Visible Light Commu-nications (VLC) .Moreover LiFi makes possible to have a wireless Internet in specific environments (hospitals, airplanes etc.) where WiFi is not allowed due to interferences or security considerations.
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.
This document summarizes a technical seminar on Li-Fi (Light Fidelity). Li-Fi uses visible light communication and LED bulbs to transmit data wirelessly. It provides advantages over Wi-Fi like higher speeds, more available spectrum, and intrinsic safety. However, it faces challenges of requiring line of sight and being susceptible to interference from other light sources. The seminar covered the history and demonstration of Li-Fi, as well as how it works, potential applications, and its advantages and challenges.
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.
The document provides an acknowledgement and thanks from the author to their seminar guide and other faculty members who provided guidance and support for the successful completion of the author's seminar. It also includes an abstract that introduces Li-Fi technology as a potential solution for wireless internet that uses light instead of radio waves, as well as a table of contents for the seminar.
Li-Fi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission. It was coined by Harald Haas at the University of Edinburgh in 2011. Li-Fi provides higher speeds and more bandwidth than Wi-Fi, with the added benefit of not interfering with other wireless networks. Li-Fi works by varying the rate at which an LED light flickers on and off, which encodes data. Products like Li-Fi 1st and Li-Flame have been developed to transmit data through LED lights at speeds up to 5Mbps downlink and 5Mbps uplink within a range of 3 meters. Solar Li-Fi uses existing LED lights and solar panels to transmit
Li fi(led transmission of data) presentationKakashi57
LIFI –”LIGHT FIDEALITY” is transmission of data through illumination, i.e. sending data through a LED light bulb that varies in intensity faster than human eye can follow. Li-Fi is a light based Wi-Fi it uses light instead of radio waves to transmit information.
HISTORY - The technology truly began during the year 1990’s in countries like Germany , Korea and Japan where they discovered LED’s could be retrofitted to send information . Prof. Harald Hass from university of Edinburgh. continues to wow the world with the potential to use light for communication He demonstrated in year 2012.
5. IMPLEMENTATION OF LI-FI The LI-FI product consists of three primary sub assemblies A. Emitter B. RF Driver C. Power Supply
6. FUNCTION OF BULB ASSEMBLY - At the heart of LI-FI is the bulb sub assembly where a sealed bulb is embedded in a dielectric material The dielectric material serves two purposes A. Wave guide B. Electric field
7. RF DRIVER - Power amplifier (PA) assembly that uses an LDMOS device. Converts electrical energy into RF power. The PA is designed to ruggedness and efficiency. The RF driver also contains controls circuit for digital and analog lighting controls.
8. HOW LI-FI WORKS- Operational procedure is very simple, if the LED is on, you transmit a digit 1, if its off you transmit a digit 0. the LED’s can be switched on and off quickly, which gives nice opportunities for transmitting data. hence all that us required is some LEDS and a controller that code data into those LEDs. We have to just vary the rate at which the LEDs flicker depending upon the data we want to encode. Thus every light source will work as a hub for data transmission. IMPLEMENTATION OF LI-FI The LI-FI product consists of three primary sub assemblies A. Emitter B. RF Driver C. Power Supply
6. FUNCTION OF BULB ASSEMBLY - At the heart of LI-FI is the bulb sub assembly where a sealed bulb is embedded in a dielectric material The dielectric material serves two purposes A. Wave guide B. Electric field
7. RF DRIVER - Power amplifier (PA) assembly that uses an LDMOS device. Converts electrical energy into RF power. The PA is designed to ruggedness and efficiency. The RF driver also contains controls circuit for digital and analog lighting controls.
8. HOW LI-FI WORKS- Operational procedure is very simple, if the LED is on, you transmit a digit 1, if its off you transmit a digit 0. the LED’s can be switched on and off quickly, which gives nice opportunities for transmitting data. hence all that us required is some LEDS and a controller that code data into those LEDs. We have to just vary the rate at which the LEDs flicker depending upon the data we want to encode. Thus every light source will work as a hub for data transmission
ZTE COMMUNICATIONS No.2 2016 : Optical wireless communicationsSitha Sok
ZTE COMMUNICATIONS No.2 2016
Fresh off the Press! The April issue focuses on optical wireless communications. Harald Hass, "the father of Li-Fi", and his student contributed to this special issue.
The document provides an overview of Li-Fi technology. It discusses the history and development of Li-Fi, which was coined by Harald Haas in 2011. It describes the working principles of Li-Fi, which uses visible light communication (VLC) to transmit data using LED lights. Data is encoded by varying the intensity of LED lights on and off rapidly. The document compares Li-Fi to Wi-Fi and discusses potential applications and advantages of Li-Fi, such as higher speeds, more available spectrum, and ability to be used in places where radio signals cannot be used. It also covers some challenges for Li-Fi commercialization.
This document summarizes key information about Li-Fi technology. It notes that Li-Fi transmits data through illumination by varying the intensity of LED light bulbs faster than the human eye can detect. The technology began in the 1990s using LEDs to transmit information. It can switch LEDs on and off very quickly to transmit digital 1s and 0s. Challenges include supporting connectivity while moving and dealing with multi-user access and shadowing, but potential solutions involving handovers, time/code division multiplexing, and using multipath signals are proposed. Li-Fi is enabled by digital transmission technologies and will enable new applications through optical attocell networks.
NOW A DAYS VISIBLE LIGHT COMMUNICATION IS MORE POPULAR. The visible light communication (VLC) refers to the communication technology which utilizes the visible light source as a signal transmitter, the air as a transmission medium, and the appropriate photodiode as a signal receiving component.Visible light is thus by definition comprised
of visually-perceivable electromagnetic waves.
The visible spectrum covers wave lengths
from 380 nm to 750 nm. The Visible Light Communications Consortium (VLCC) which is mainly comprised of Japanese technology companies was founded in November 2003. It increases the data speed compared to any communication
Position
This document discusses using Li-Fi (Light Fidelity) technology for data transmission, industrial automation, and biomedical applications. It begins by introducing Li-Fi and how it works by transmitting data through LED lights. It then discusses using Li-Fi for an industrial automation system by transmitting control signals to devices from a central location. Finally, it proposes a biomedical application where a biosensor would detect a patient's blood pressure and heart rate, and this data would be transmitted to different locations like doctors' offices using Li-Fi technology.
Li-Fi is a technology that uses light from light-emitting diodes (LEDs) for high-speed data transmission. It can transmit data through illumination at speeds up to 500 Mbps, which is faster than current Wi-Fi technologies. Li-Fi uses visible light communication (VLC) which involves varying the intensity of light from an LED to transmit data. It takes advantage of unused spectrum in the electromagnetic spectrum and has several advantages over traditional Wi-Fi such as higher bandwidth, more secure communication, and lower costs. Some potential applications of Li-Fi include indoor networking, traffic light communication systems, and "underwater communications."
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.
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.
1) 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 does not cause any radio interference.
2) Li-Fi works by varying the intensity of light from an LED to transmit data. An LED bulb acts as a transmitter and a photo-sensitive detector acts as a receiver. Data is encoded by switching the LED bulb on and off at extremely high speeds undetectable to the human eye.
3) Potential applications of Li-Fi include use in places where Wi-Fi is restricted like hospitals and aircraft, as well as enabling faster internet access in public places using street lights outfitted
Light Fidelity (Li-Fi) is a bidirectional, high speed , fully networked wireless communication technology similar to Wi-Fi. Li-Fi was first put forward by Professor Harald Haas,University of Edinburgh, during a TED Talk in 2011. Li-Fi is a form of visible light communication and a subset of optical wireless communications (OWC) and could be a complement to RF communication (Wi-Fi or Cellular network), or even a replacement in contexts of data broadcasting. It is so far measured to be about 100 times faster than some Wi-Fi implementations, reaching speeds of 224 gigabits per second.
Visible light communication uses LED lights to transmit data by varying the intensity of light. It offers several advantages over traditional wireless technologies like WiFi. Data can be transmitted through visible light at speeds higher than WiFi and without interfering with other wireless networks. It also provides a secure communication medium as light cannot pass through walls. While the technology is still being developed, it shows promise in helping overcome bandwidth limitations of existing wireless networks.
Visible light communication (VLC) uses visible light spectrum to transmit data wirelessly. It has several advantages over traditional wireless technologies like WiFi, including no interference with other devices, safety in medical settings, and ubiquitous availability with rising LED usage. Early experiments with VLC date back to 1880 with Alexander Graham Bell's photophone. Modern standardization efforts aim to avoid fragmentation and promote applications like indoor localization, smart retail, and vehicle-to-vehicle communication. Key challenges include increasing data rates and providing bidirectional communication capabilities. VLC remains an emerging technology but shows promise for a variety of uses.
This document is a project report submitted by four students (Niteesh Khanolkar, Sudhir Menon, Kaustubh Band, Chinmay Rane) for their Bachelor's degree. It discusses their project on visible light data transmission under the guidance of Prof. Archana Patil. The report includes an introduction to visible light communication, a literature review on the topic, a proposed system design, hardware and software requirements, features and applications of the system, and plans for future work.
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
Data transmission through visible light communication (li fi)Omkar Omkar
The document is a project report for a Digital Communication course that explores data transmission through visible light communication (VLC). It discusses two prototypes created by the students:
1. A VLC transceiver circuit that was able to transmit and receive data through an LED and photodiode. This demonstrated basic VLC functionality.
2. An audio transmission system using VLC that sent a song from a computer to a speaker using an LED and solar panel receiver.
The report also covers the characteristics of LEDs for VLC, modulation schemes like OFDM that could be used, challenges in implementing the hardware, and techniques for mitigating nonlinear distortion in LEDs. The overall goal was to research and prototype basic V
Lifi(Light fidelity)-Efficient use of visible spectruminventionjournals
ABSTRACT : LEDs are beginning to be used in every home and office which makes LED’s light ideal for ubiquitous data transmitter This means that everywhere where LEDs are used, lighting bulbs can bring not only the light but wireless connection at the same time. With increasing demand for wireless data, lack of radio spectrum and issues with hazardous electromagnetic pollution, LiFi is a new wireless communication technology which enables a wireless data transmission through LED light. LiFi appears as a new greener, healthier and cheaper alternative to WiFi. Li-Fi is the emerging area of technology is also known as Visible Light Commu-nications (VLC) .Moreover LiFi makes possible to have a wireless Internet in specific environments (hospitals, airplanes etc.) where WiFi is not allowed due to interferences or security considerations.
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.
This document summarizes a technical seminar on Li-Fi (Light Fidelity). Li-Fi uses visible light communication and LED bulbs to transmit data wirelessly. It provides advantages over Wi-Fi like higher speeds, more available spectrum, and intrinsic safety. However, it faces challenges of requiring line of sight and being susceptible to interference from other light sources. The seminar covered the history and demonstration of Li-Fi, as well as how it works, potential applications, and its advantages and challenges.
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.
The document provides an acknowledgement and thanks from the author to their seminar guide and other faculty members who provided guidance and support for the successful completion of the author's seminar. It also includes an abstract that introduces Li-Fi technology as a potential solution for wireless internet that uses light instead of radio waves, as well as a table of contents for the seminar.
Li-Fi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission. It was coined by Harald Haas at the University of Edinburgh in 2011. Li-Fi provides higher speeds and more bandwidth than Wi-Fi, with the added benefit of not interfering with other wireless networks. Li-Fi works by varying the rate at which an LED light flickers on and off, which encodes data. Products like Li-Fi 1st and Li-Flame have been developed to transmit data through LED lights at speeds up to 5Mbps downlink and 5Mbps uplink within a range of 3 meters. Solar Li-Fi uses existing LED lights and solar panels to transmit
Li fi(led transmission of data) presentationKakashi57
LIFI –”LIGHT FIDEALITY” is transmission of data through illumination, i.e. sending data through a LED light bulb that varies in intensity faster than human eye can follow. Li-Fi is a light based Wi-Fi it uses light instead of radio waves to transmit information.
HISTORY - The technology truly began during the year 1990’s in countries like Germany , Korea and Japan where they discovered LED’s could be retrofitted to send information . Prof. Harald Hass from university of Edinburgh. continues to wow the world with the potential to use light for communication He demonstrated in year 2012.
5. IMPLEMENTATION OF LI-FI The LI-FI product consists of three primary sub assemblies A. Emitter B. RF Driver C. Power Supply
6. FUNCTION OF BULB ASSEMBLY - At the heart of LI-FI is the bulb sub assembly where a sealed bulb is embedded in a dielectric material The dielectric material serves two purposes A. Wave guide B. Electric field
7. RF DRIVER - Power amplifier (PA) assembly that uses an LDMOS device. Converts electrical energy into RF power. The PA is designed to ruggedness and efficiency. The RF driver also contains controls circuit for digital and analog lighting controls.
8. HOW LI-FI WORKS- Operational procedure is very simple, if the LED is on, you transmit a digit 1, if its off you transmit a digit 0. the LED’s can be switched on and off quickly, which gives nice opportunities for transmitting data. hence all that us required is some LEDS and a controller that code data into those LEDs. We have to just vary the rate at which the LEDs flicker depending upon the data we want to encode. Thus every light source will work as a hub for data transmission. IMPLEMENTATION OF LI-FI The LI-FI product consists of three primary sub assemblies A. Emitter B. RF Driver C. Power Supply
6. FUNCTION OF BULB ASSEMBLY - At the heart of LI-FI is the bulb sub assembly where a sealed bulb is embedded in a dielectric material The dielectric material serves two purposes A. Wave guide B. Electric field
7. RF DRIVER - Power amplifier (PA) assembly that uses an LDMOS device. Converts electrical energy into RF power. The PA is designed to ruggedness and efficiency. The RF driver also contains controls circuit for digital and analog lighting controls.
8. HOW LI-FI WORKS- Operational procedure is very simple, if the LED is on, you transmit a digit 1, if its off you transmit a digit 0. the LED’s can be switched on and off quickly, which gives nice opportunities for transmitting data. hence all that us required is some LEDS and a controller that code data into those LEDs. We have to just vary the rate at which the LEDs flicker depending upon the data we want to encode. Thus every light source will work as a hub for data transmission
ZTE COMMUNICATIONS No.2 2016 : Optical wireless communicationsSitha Sok
ZTE COMMUNICATIONS No.2 2016
Fresh off the Press! The April issue focuses on optical wireless communications. Harald Hass, "the father of Li-Fi", and his student contributed to this special issue.
The document provides an overview of Li-Fi technology. It discusses the history and development of Li-Fi, which was coined by Harald Haas in 2011. It describes the working principles of Li-Fi, which uses visible light communication (VLC) to transmit data using LED lights. Data is encoded by varying the intensity of LED lights on and off rapidly. The document compares Li-Fi to Wi-Fi and discusses potential applications and advantages of Li-Fi, such as higher speeds, more available spectrum, and ability to be used in places where radio signals cannot be used. It also covers some challenges for Li-Fi commercialization.
This document summarizes key information about Li-Fi technology. It notes that Li-Fi transmits data through illumination by varying the intensity of LED light bulbs faster than the human eye can detect. The technology began in the 1990s using LEDs to transmit information. It can switch LEDs on and off very quickly to transmit digital 1s and 0s. Challenges include supporting connectivity while moving and dealing with multi-user access and shadowing, but potential solutions involving handovers, time/code division multiplexing, and using multipath signals are proposed. Li-Fi is enabled by digital transmission technologies and will enable new applications through optical attocell networks.
NOW A DAYS VISIBLE LIGHT COMMUNICATION IS MORE POPULAR. The visible light communication (VLC) refers to the communication technology which utilizes the visible light source as a signal transmitter, the air as a transmission medium, and the appropriate photodiode as a signal receiving component.Visible light is thus by definition comprised
of visually-perceivable electromagnetic waves.
The visible spectrum covers wave lengths
from 380 nm to 750 nm. The Visible Light Communications Consortium (VLCC) which is mainly comprised of Japanese technology companies was founded in November 2003. It increases the data speed compared to any communication
Position
This document discusses using Li-Fi (Light Fidelity) technology for data transmission, industrial automation, and biomedical applications. It begins by introducing Li-Fi and how it works by transmitting data through LED lights. It then discusses using Li-Fi for an industrial automation system by transmitting control signals to devices from a central location. Finally, it proposes a biomedical application where a biosensor would detect a patient's blood pressure and heart rate, and this data would be transmitted to different locations like doctors' offices using Li-Fi technology.
Li-Fi is a technology that uses light from light-emitting diodes (LEDs) for high-speed data transmission. It can transmit data through illumination at speeds up to 500 Mbps, which is faster than current Wi-Fi technologies. Li-Fi uses visible light communication (VLC) which involves varying the intensity of light from an LED to transmit data. It takes advantage of unused spectrum in the electromagnetic spectrum and has several advantages over traditional Wi-Fi such as higher bandwidth, more secure communication, and lower costs. Some potential applications of Li-Fi include indoor networking, traffic light communication systems, and "underwater communications."
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.
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.
The document discusses the potential for using visible light communication (LiFi) as an alternative to traditional radio frequency wireless communication technologies. It notes that the 1.4 million existing cellular base stations use significant energy with low efficiency, while the radio frequency spectrum is limited and issues like availability and security exist. LiFi uses high-speed pulses of light for wireless transmission and has advantages like large available spectrum, high efficiency when combined with LED lights, availability anywhere light exists, and improved security since light does not pass through walls. While it has limitations like needing line of sight and potential external light interference, it has been proven in demonstrations and could see applications like in hospitals, traffic lights, and aircraft once costs decrease.
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 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 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 Technology || World's fastest Internet SpeedMasuma Akhatar
Li-Fi is a wireless communication technology that uses visible light communication to transmit data using LED lights. It provides higher speeds than Wi-Fi and does not suffer from bandwidth limitations of radio frequencies. Li-Fi works by switching LED lights on and off very fast to transmit digital signals, and photo detectors translate the signals back into data. Potential applications of Li-Fi include use in confined areas like airplanes, hospitals, and traffic lights communicating with cars. Challenges include the need for line of sight and interference from other light sources.
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.
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
Li-Fi uses visible light communication and LED bulbs to transmit data wirelessly. It was coined by Professor Harald Haas in 2011 as a wireless alternative to Wi-Fi that could increase available bandwidth. Li-Fi transmits data through rapid variations in LED light intensity faster than what the human eye can detect. It provides higher speeds than Wi-Fi, does not interfere with other devices, and the signal cannot pass through walls providing better security. While Li-Fi remains in development, potential applications include use in vehicles, aviation, underwater communication and hospitals.
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 summarizes Li-Fi technology, which uses visible light communication to transmit data wirelessly. It describes how Li-Fi works by modulating the intensity of LED lights to transmit binary data. The document outlines some of Li-Fi's applications in hospitals, airplanes, and power plants. It also compares Li-Fi's high data rates to other wireless technologies and discusses Li-Fi's advantages of security, safety, and unutilized spectrum and disadvantages of needing line of sight.
Li-Fi is a technology that uses light from LED bulbs to transmit data wirelessly. It can provide internet access from any light source at speeds over 100 Mbps. Li-Fi differs from Wi-Fi in that it does not use radio waves but instead transmits data through light waves, allowing for greater bandwidth and no interference. Some potential applications of Li-Fi include use in hospitals, on airplanes, and in power plants where radiowaves are not desirable. However, Li-Fi also faces challenges of requiring line of sight and not being able to penetrate solid objects like walls.
Smart phones, tablets, and the rise of the Internet of Things are driving an insatiable demand for wireless capacity. This demand requires networking and Internet infrastructures to evolve to meet the needs of current and future multimedia applications. Wireless HetNets will play an important role toward the goal of using a diverse spectrum to provide high quality-of-service, especially in indoor environments where most data are consumed. An additional tier in the wireless HetNets concept is envisioned using indoor gigabit small-cells to offer additional wireless capacity where it is needed the most. The use of light as a new mobile access medium is considered promising. In this article, we describe the general characteristics of WiFi and VLC (or LiFi) and demonstrate a practical framework for both technologies to coexist. We explore the existing research activity in this area and articulate current and future research challenges based on our experience in building a proof-of-concept prototype VLC HetNet.
This paper attempts to clarify the difference between visible light communication (VLC) and Light-Fidelity (LiFi). In particular, it will show how LiFi takes VLC further by using light emitting diodes (LEDs) to realise fully networked wireless systems. Synergies are harnessed as luminaries become LiFi attocells resulting in enhanced wireless capacity providing the necessary connectivity to realise the Internet-of-Things (IoT), and contributing to the key performance indicators for the 5th generation of cellular systems (5G) and beyond
Li-Fi is a technology that uses light from LED bulbs to transmit data wirelessly. It provides significantly higher speeds than Wi-Fi and uses the visible light spectrum, which has 10,000 times more available capacity than radio frequencies. Li-Fi works by varying the rate at which LED bulbs flicker on and off to transmit binary data, with receptors in devices decoding the light. It has advantages over Wi-Fi like better speeds, simple deployment using existing lighting, more secure transmission limited by walls, and no electromagnetic interference.
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.
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
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Monitoring and observability aren’t traditionally found in software curriculums and many of us cobble this knowledge together from whatever vendor or ecosystem we were first introduced to and whatever is a part of your current company’s observability stack.
While the dev and ops silo continues to crumble….many organizations still relegate monitoring & observability as the purview of ops, infra and SRE teams. This is a mistake - achieving a highly observable system requires collaboration up and down the stack.
I, a former op, would like to extend an invitation to all application developers to join the observability party will share these foundational concepts to build on:
For the full video of this presentation, please visit: https://www.edge-ai-vision.com/2024/06/building-and-scaling-ai-applications-with-the-nx-ai-manager-a-presentation-from-network-optix/
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End-to-end overview of CI/CD pipeline with Azure devops
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Partecipate alla presentazione per immergervi in una storia di interoperabilità, standard e formati aperti, per poi discutere del ruolo importante che i contributori hanno in una comunità open source sostenibile.
BIO: Sostenitrice del software libero e dei formati standard e aperti. È stata un membro attivo dei progetti Fedora e openSUSE e ha co-fondato l'Associazione LibreItalia dove è stata coinvolta in diversi eventi, migrazioni e formazione relativi a LibreOffice. In precedenza ha lavorato a migrazioni e corsi di formazione su LibreOffice per diverse amministrazioni pubbliche e privati. Da gennaio 2020 lavora in SUSE come Software Release Engineer per Uyuni e SUSE Manager e quando non segue la sua passione per i computer e per Geeko coltiva la sua curiosità per l'astronomia (da cui deriva il suo nickname deneb_alpha).
Alt. GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using ...James Anderson
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2. 2
ABSTRACT
Whether you‘re using wireless internet in a coffee shop, stealing it from the guy next door, or
competing for bandwidth at a conference, you’ve probably gotten frustrated at the slow
speeds you face when more than one device is tapped into the network. As more and more
people and their many devices access wireless internet, clogged airwaves are going to make it
increasingly difficult to latch onto a reliable signal. But radio waves are just one part of the
spectrum that can carry our data. What if we could use other waves to surf the internet?
One German physicist DR. Harald Haas has come up with an idea and he calls it Li-Fi. He
envisions a future where data for laptops, smart phones and tablets is transmitted through the
light in a room. Light Fidelity (Li-Fi) is a bidirectional, high speed, fully networked wireless
communication technology similar to Wi-Fi. It is a form of visible light communication.
By 2020 44 zeta bytes of data will be generated and 80 billion Internet of Things devices will
be connected to the internet. The current wireless technology will not able to handle so much
of data. Thus we need to explore and see if we can use visible light for communication.
3. 3
CONTENTS
1. Wi-Fi 8
2. Need For Li-Fi 11
3. History Of Li-Fi 14
4. Working Of Li-Fi 15
5. Li-Fi Products 18
6. Solar Li-Fi 22
7. Applications Of Li-Fi 24
8. Limitations Of Li-Fi 28
9. Conclusion 29
References
Appendix
4. 4
LIST OF FIGURES
Fig-1: Cellular radio base station and Mobile phone 11
Fig-2: Electromagnetic Spectrum 12
Fig-3: Professor Harald Hass 14
Fig-4: Transmission using Li-Fi 15
Fig-5: block diagram of Li-Fi 16
Fig-6: Li-Fi system connecting devices in a room 17
Fig-7: Li-1st 18
Fig -8: Block diagram of Li-1st 19
Fig-9: Li Flame 20
Fig -10: Li-Flame ceiling unit 21
Fig-11: Li-Flame desktop unit 21
Fig-12: Solar Li-Fi 22
Fig- 13: Li-Fi in aircraft 24
Fig- 14: Li-Fi in under water 25
Fig- 15: Li-Fi in power plants 25
Fig- 16: Li-Fi in traffic management 26
Fig- 17: Li-Fi in hospitals 27
Fig-18: Li-Fi in shops 27
5. 5
LIST OF ABBREVATIONS
1. VLC-Visible Light Communication
2. Li-Fi-Light Fidelity
3. Wi-Fi-Wireless Fidelity
4. LED-Light Emitting Diode
5. IR-Infrared Ray
6. OFDM-orthogonal frequency division multiplexing
7. OOK-OnOff Keying
8. FHSS-Frequency Hop Spread Spectrum
9. DSSS-Direct Sequence Spread Spectrum
10. QAM-Quadrature Amplitude Modulation
6. 6
CHAPTER 1
Wi-Fi
Wi-Fi is a technology that allows electronic devices to connect to a wireless local area
network (WLAN) mainly using the 2.4 gigahertz (12 cm) and 5 gigahertz (6 cm) radio
bands. A WLAN is usually password protected, but may be open, which allows any device
within its range to access the resources of the WLAN network. The Wi-Fi Alliance defines
Wi-Fi as any "wireless local area network" (WLAN) product based on the IEEE 802.11
standards.
Devices which can use Wi-Fi technology include personal computers, video-game consoles,
smart phones, digital cameras, tablet computers, digital audio players and modern printers.
Wi-Fi compatible devices can connect to the Internet via a WLAN network and a wireless
access point. Such an access point has a range of about 20 meters (66 feet) indoors and a
greater range outdoors. Hotspot coverage can be as small as a single room with walls that
block radio waves, or as large as many square kilometres achieved by using multiple
overlapping access points. Wi-Fi is less secure than wired connections because an intruder
does not need a physical connection.
The IEEE 802.11 standard is a set of media access control (MAC) and physical layer (PHY)
specifications for implementing wireless local area network (WLAN) computer
communication. The base version of the standard was released in 1997, and has had
subsequent amendments. The standard and amendments provide the basis for wireless
network products. 802.11-1997 was the first wireless networking standard in the family, but
802.11b was the first widely accepted one, followed by 802.11a, 802.11g, 802.11n, and
802.11ac. The frequency used is either 2.4 GHz or 5 GHz.The maximum speed has been
constantly improving.802.11a could achieve a maximum speed of 54 Mbps.Theoretically
802.11n and 802.11 ac can reach a speed of 600 Mbps and 1.3Gbps respectively
7. 7
Protocol Frequency Signal Max. Data Rate
Legacy 802.11 2.4 GHz FHSS or DSSS 2 Mbps
802.11a 5 GHz OFDM 54Mbps
802.11b 2.4 GHz HR-DSSS 11Mbps
802.11g 2.4 GHz OFDM 54Mbps
802.11n 2.4 or 5 GHz OFDM 600Mbps
802.11ac 5 GHz 256-QAM 1.3Gbps
The various modulation techniques that have been used are:
1: FHSS-Frequency Hop Spread Spectrum
Frequency Hopping Spread Spectrum (FHSS) is a method of transmitting radio signals by
rapidly switching a carrier among many frequency channels using a pseudorandom sequence
known to both transmitter and receiver.
2: DSSS-Direct Sequence Spread Spectrum
Direct-sequence spread spectrum (DSSS) is a spread spectrum modulation technique. Spread
spectrum systems are such that they transmit the message bearing signals using a bandwidth
that is in excess of the bandwidth that is actually needed by the message signal.
3: OFDM- Orthogonal frequency-division multiplexing
It is a method of encoding digital data on multiple carrier frequencies. A large number of
closely spaced orthogonal sub-carrier signals are used to carry data on several parallel data
streams. Each sub-carrier is modulated with a conventional modulation scheme
8. 8
4: QAM-Quadrature Amplitude Modulation
Quadrature amplitude modulation (QAM) is both an analog and a digital modulation
scheme. It conveys two analog message signals or two digital bit streams by changing the
amplitude of two carrier waves using amplitude shift keying digital modulation scheme or
amplitude modulation analog modulation scheme.
9. 9
CHAPTER 2
Need For Li-Fi
We have 1.4 million cellular radio masts deployed worldwide. And these are base
stations. And we also have more than five billion of these devices here.These are cellular
mobile phones. And with these mobile phones, we transmit more than 600 terabytes of
data every month.
Fig-1: Cellular radio base station and Mobile phone
The main issues facing wireless communication using radio waves are:
1. Capacity
2. Efficiency
3. Availability
4. Security
10. 10
The radio waves are limited. They are scarce; they are expensive; and we only have a certain
range of it.Thus capacity is an issue. 1.4 million cellular radio masts, or base
stations, consume a lot of energy.
Most of the energy is not used to transmit the radio waves; it is used to cool the base stations.
Then the efficiency of such a base station is only at about five per cent. We have to switch off
our mobile phones in aircrafts. In petro chemical plants radio waves cannot be used. Radio
waves are not available everywhere. Security is another issue. These radio waves penetrate
through walls. They can be intercepted, and somebody can make use of your network if he
has bad intentions.
Fig-2: Electromagnetic Spectrum
Thus it is clear that although wireless communication using radio waves is very useful there
are some issues with it.Radio waves are just one part of the electromagnetic spectrum. Let us
see if we can use other waves for communication. Gamma rays are harmful and we cannot
use them. X-rays can be used in hospitals but not much beyond that. Ultra violet rays are
dangerous for human body. Infra- red rays can be used only in low power applications due to
11. 11
eye safety regulations. But we have visible light ranging from 400 THz to 800 THz. Let us
see the advantages we will have if we use visible light for communication (VLC).
Advantages of using visible light for communication
Due to a bandwidth of almost 400 THz we can solve the capacity issue using visible light
communication. We have 10,000 times more spectrum when compared to radio waves.
This is data through illumination -- it's first of all an illumination device. So if we can
combine data transfer and illumination it would be great. Also led light bulbs have high
energy efficiency.
Light is available in aircrafts and hospitals. Light is available everywhere. Thus there is no
more availability issue. Light does not penetrate walls. Hence Li-Fi is more secure than Wi-
Fi. So thus it is clear that there is immense potential in visible light communication.
12. 12
CHAPTER 3
HISTORY OF Li-Fi
The idea of Li-Fi was introduced by a German Physicist Prof.Harald Haas; in his TED Global
talk in 2011.It was in this talk that Li-Fi was demonstrated for the first time.
Fig-3: Professor Harald Hass
He used a table lamp with an LED bulb to transmit a video of blooming flowers that was then
projected onto a screen behind him. During the event he periodically blocked the light from
lamp to prove that the lamp was indeed the source of incoming data.
PureLiFi was established in 2012 as VLC ltd. It aims to develop and deliver Li-Fi solutions.
They have successfully launched 3 Li-Fi products. They are Li-1st, Li- Flame, LiFi- X. In
2015 solar Li-Fi was demonstrated. Solar cells were used as Li-Fi receivers.
13. 13
CHAPTER 4
WORKING OF Li-Fi
An LED is a semiconductor. It's an electronic device. And it has a very nice acute
property. Its intensity can be modulated at very high speeds, and it can be switched off at
very high speeds. And this is a fundamental basic property that we exploit with our
technology.
Remote controls have an infrared LED. It creates a simple, low-speed data stream in 10,000
bits per second or 20,000 bits per second. We transmit with our technology, not only a single
data stream; we transmit thousands of data streams in parallel, at even higher speeds using Li-
Fi.
Fig-4: Transmission using Li-Fi
The operational procedure is very simple, if the LED is on, you transmit a digital 1, if it’s off
you transmit a digital 0. The LEDs can be switched on and off very quickly, which gives nice
opportunities for transmitting data. Hence all that is required is some LEDs and a controller
that code data into those LEDs. We have to just vary the rate at which the LED’s flicker
depending upon the data we want to encode.
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Fig-5: block diagram of Li-Fi
When a constant current is applied to an LED light bulb a constant stream of photons are
emitted from the bulb which is observed as visible light. If the current is varied slowly the
output intensity of the light dims up and down. Because LED bulbs are semi-conductor
devices, the current, and hence the optical output, can be modulated at extremely high speeds
which can be detected by a photo-detector device and converted back to electrical current.
The intensity modulation is imperceptible to the human eye, and thus communication is just
as seamless as RF. Using this technique, high speed information can be transmitted from an
LED light bulb.
Since Li-Fi uses visible light for sending data, it is necessary to modulate the data into a
signal which can be transmitted. One possible modulation technique is OOK.On-off keying
(OOK) denotes the simplest form of amplitude-shift keying (ASK) modulation that represents
digital data as the presence or absence of a carrier wave. In its simplest form, the presence of
a carrier for a specific duration represents a binary one, while its absence for the same
duration represents a binary zero.
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Fig-6: Li-Fi system connecting devices in a room.
The above figure shows how Li-Fi can be implemented. The LED bulbs shown in the figure
are not just illuminating devices alone. They can transfer data as well. Using this we can
access the internet from our mobiles, computer and laptops.
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CHAPTER 5
Li-Fi PRODUCTS
5.1: Li-1st
Fig-7: Li-1st
This is the world’s first Li-Fi system. It offers full duplex communication with a capacity
up to 5Mbps downlink and 5Mbps uplink. It has a range of up to 3 meters. It has ceiling
unit and desktop unit.
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Li-1st Ceiling Unit
It is connected to the data network via a standard Ethernet RJ45 port.
It encodes the data and transmits it by modulating the intensity of the LED light. The Li-
1st ceiling unit receives and decodes the uplink signal using an infra-red detector and
optics.
Fig -8: Block diagram of Li-1st
Li-1st desktop unit
The desktop unit has a visible light decoder captures the continuous sequence of light
intensity changes. It then decodes the binary stream and transmits it to the client device via
an USB connection. The desktop unit receives data from the client device, encodes it and
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transmits it to the ceiling unit using an infra-red emitter. The receiver is very sensitive. It
can operate even using reflected light.
5.2: Li-Flame
The Li-Flame is the world’s first high-speed wireless network solution using VLC. There
are multiple APs (access point) throughout an indoor space allow users to move from one
AP to the next AP.There is no interruption in its high-speed data stream.
Fig-9: Li Flame.
Li-Flame ceiling unit
Data and power via standard Ethernet port
Simple installation
Connects to an LED light fixture to form an atto-cell over a wide area
Multiple access
Handover control enables seamless switching between Aps
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Li-Flame Desktop Unit
Connects to client device via USB
10Mbps infrared uplink to ceiling unit
Handover capable, allowing user to move from one AP to the next without losing the
high-speed data connection
Transceiver swivel head can be adjusted by user to optimise the connection
Battery-powered and portable
Fig -10: Li-Flame ceiling unit
Fig-11: Li-Flame desktop unit.
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CHAPTER 6
SOLAR Li-Fi
There will be a massive extension of the Internet to close the digital divide, and also to
allow for what we call "The Internet of Things" -- tens of billions of devices connected to
the Internet. Such an extension of the Internet can only work if it's almost energy-
neutral. This means we need to use existing infrastructure as much as possible. And this is
where the solar cell and the LED come in.It is possible to transmit a video from a standard
off-the-shelf LED lamp to a solar cell with a laptop acting as a receiver.
Fig-12: Solar Li-Fi
A solar cell absorbs light and converts it into electrical energy. This is why we can use a
solar cell to charge our mobile phone. But now we need to remember that the data is
encoded in subtle changes of the brightness of the LED, so if the incoming light
fluctuates, so does the energy harvested from the solar cell. This means we have a
principal mechanism in place to receive information from the light and by the solar cell,
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because the fluctuations of the energy harvested correspond to the data transmitted. Of
course the question is: can we receive very fast and subtle changes of the brightness, such
as the ones transmitted by LED lights? And the answer to that is yes, we can.
In 2015, Harald Haas demonstrated the use of solar cells as Li-Fi receivers. A solar cell has
become a receiver for high-speed wireless signals encoded in light, while it maintains its
primary function as an energy-harvesting device. That's why it is possible to use existing
solar cells on the roof of a hut to act as a broadband receiver from a laser station on a close by
hill, or indeed, lamp post.
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CHAPTER 7
APPLICATIONS OF Li-Fi
7.1: Aircrafts
Fig- 13: Li-Fi in aircraft
Wi-Fi is not used in aircrafts because it may interfere with the navigation system of pilots.
The light available in aircrafts can be used for data transmission. Thus it is possible that
passengers can watch online videos during long flights.
7.2: Under water applications
Under water ROVs (Remote Operated Vehicles) operate from large cables that supply
power and allow them to receive signals from above. But the tether is not long enough to
allow them to explore large areas. If their wires were replaced with light-say from a
submerged, high powered lamp-then they would be freer to explore.
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Fig- 14: Li-Fi in under water
7.3: Power Plants
Fig- 15: Li-Fi in power plants
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Power plants need fast data systems to monitor important parameters. Radio waves cannot
be used because they will cause interference. Here Li-Fi offers safe, abundant connectivity
for all areas of these sensitive locations.
7.4: Traffic Management
Fig- 16: Li-Fi in traffic management.
In traffic signals Li-Fi can be used for communication with LED light of cars. Also LED
lights of 2 cars can communicate with each other. This can help in better traffic management
and reduce the number of accidents.
7.5: Medical Applications
Operation theatres do not allow Wi-Fi due to radiation concerns. To overcome this and to
make OT tech savvy Li-Fi can be used to access internet and to control medical
equipment’s. This can be even beneficial for robotic surgeries and other automated
procedures.
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Fig- 17: Li-Fi in hospitals.
7.6: In shops
Fig-18: Li-Fi in shops
Shopkeepers can use Li-Fi to communicate with customers. This is an innovative technique.
They can display details of their products like the cost, discount rate and so on. This would
enhance the shopping experience of the customers
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CHAPTER 8
Limitations of Li-Fi
One of the major demerits of this technology is that light cannot penetrate into the walls and
other materials which radio waves can do. Thus the signal will be contained to one area.
Using Li-Fi technology to achieve ideal speeds direct line of sight may be required. Line-of-
sight means the photo detectors have to be able to actually see the light in order to capture the
data.
Another major challenge facing Li-Fi technology is how the receiving device will transmit
back to transmitter. In Li-Fi products like Li-Flame infrared rays had to be used for uplink
communication.
Interferences from external light sources like sun light, normal bulbs, and opaque materials in
the path of transmission can cause interruption in the communication.
Thus it is clear that Li-Fi technology has some limitations. Still Li-Fi could emerge as a boon
to the rapidly depleting bandwidth of radio waves.Li-Fi is not going to replace Wi-Fi but it is
an effective technology which can be used along with Wi-Fi.
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CHAPTER 9
CONCLUSION
Li-Fi has great potential in the field of wireless data transmission. It has the ability to
revolutionise wireless communication in the future.
Using Li-Fi we aim to combine two basic functionalities-illumination and wireless data
transmission. This could solve the four essential problems that face us in wireless
communication these days.
Every light source has the potential to be a hub for data transmission. In the future data for
laptops, smartphones could be transmitted through the light in the room.
Thus Li-Fi has the potential to lead us to a cleaner, greener and maybe just a brighter future.
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REFERENCES
1. Harald Haas, Member, IEEE, Liang Yin, Student Member, IEEE, Yunlu Wang, Student
Member, IEEE , and Cheng Chen, Student Member, IEEE ,“What is LiFi?”, Journal Of Light
wave Technology,2015
2. Shubham Chatterjee, Shalabh Agarwal, Asoke Nath “Scope and Challenges in Light
Fidelity (LiFi) Technology in Wireless Data Communication”, International Journal of
Innovative Research in Advanced Engineering (IJIRAE), Issue 6, Volume 2 (June 2015)
3. Nitin Vijaykumar Swami,” Li-Fi (LIGHT FIDELITY) – THE CHANGING SCENARIO
OF WIRELESS COMMUNICATION”, IJRET: International Journal of Research in
Engineering and Technology, 2015
4. http://www.lifi.eng.ed.ac.uk/
5. http://purelifi.com/