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..)
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..)
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
With the vast growing gadgets, their usage and their developments led to the advancement in the Wi-Fi which provides a technology so called Li-Fi.Li-Fi is a 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 freely. 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.. Dr herald Haas ,the professor of mobile communications at the university of Edinburgh school of engineering ,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.
This is the latest technolgy which encourages viewers. Also this technolgy is vast because researchers are still researching about this technolgy so that this technolgy can be used practically all over the world.
A powerpoint presentation on Light-Fidelity technology.
Li-Fi (Light-Fidelity) is transmission of data through illumination, sending data through a LED light bulb that varies intensity faster than human eye can follow.
Li fi technology paper presentation, Li- Fi, VLC, Visible light communication...Sirod Deo
The demand for wireless data is increasing at an exponential rate hence to cater the demand, various technology options are to be looked for and need to be implemented. An emerging technology using Visible Light Communication (VLC) for high speed wireless communications is Light Fidelity dubbed as Li-Fi. To provide high speed communication light is modulated without interfering the main purpose of lamp that is of illumination. LEDs are considered as a key component to be used in transmission because of its low cost and Omni-presence. 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.
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
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
With the vast growing gadgets, their usage and their developments led to the advancement in the Wi-Fi which provides a technology so called Li-Fi.Li-Fi is a 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 freely. 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.. Dr herald Haas ,the professor of mobile communications at the university of Edinburgh school of engineering ,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.
This is the latest technolgy which encourages viewers. Also this technolgy is vast because researchers are still researching about this technolgy so that this technolgy can be used practically all over the world.
A powerpoint presentation on Light-Fidelity technology.
Li-Fi (Light-Fidelity) is transmission of data through illumination, sending data through a LED light bulb that varies intensity faster than human eye can follow.
Li fi technology paper presentation, Li- Fi, VLC, Visible light communication...Sirod Deo
The demand for wireless data is increasing at an exponential rate hence to cater the demand, various technology options are to be looked for and need to be implemented. An emerging technology using Visible Light Communication (VLC) for high speed wireless communications is Light Fidelity dubbed as Li-Fi. To provide high speed communication light is modulated without interfering the main purpose of lamp that is of illumination. LEDs are considered as a key component to be used in transmission because of its low cost and Omni-presence. 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.
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
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.
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.
Light–Fidelity (Li-Fi) is a technology that uses the Light Emitting Diodes (LEDs) to transmit wireless data instead of radio waves.
This is going to be the future of wireless data transmission.
Li-Fi stands
for Light-Fidelity is transmission of data through
illumination taking the fibber out of fiber optic by
sending data through an LED light bulb
Li-Fi , or "light fidelity", refers to wireless communication systems using light from light-emitting diodes as a medium instead of traditional radio frequencies, as in technology using the trademark Wi-Fi. Li-Fi is expected to be ten times cheaper than Wi-Fi. Li-Fi has the advantage of being able to be used in electromagnetic sensitive areas such as in aircraft or nuclear power plants, without causing interference.
Unlike traditional Wi-Fi routers, which use radio signals, this LiFi system relies on light to send and receive data wirelessly. If you notice an Ethernet cable plugged into the laptops that’s just to get the data from the receiver into the computer. The problem with Wi-Fi is that it uses radio signals and the amount of radio spectrum is limited. LiFi, however, could be deployed in everyday LED bulbs and cover the entire interior of a home or office. The system on show ran at 150 Mbps, but with a more powerful LED light, it could reach 3.5Ghz.
Renewable Energy, Kenya, Nigeria and South AfricaPeter Kuria
Identifying Possibilities and Building Networks
for Renewable Energy in Nigeria, Kenya
and South Africa: Connect Project Experiences.
Africa is stated to be the last economic growth frontier in the world. Africa is both developing fast and having great development needs. Identified megatrends in Africa include urbanisation: the largely uncontrolled growth of
mega cities, mega regions and also mega slums. For example, Lagos contributed about 25% to the Nigerian GDP in 2014, the city population grows by 8 % annually, while 75% of Lagos population is expected to live in informal
settlements by 2030. There are huge infrastructure needs in cities, and massive projects are being implemented. Energy is another megatrend with urgent need for sustainable energy solutions. Lack of energy is an obstacle for growth
and development of well-being. (James, M. 2014).
Peter Kuria Githinji is Director of NGO Shalin Finland and works for HAMK University of Applied Sciences in the Connect project. He holds a MSc degree in Tropical Ecology from the University of Zimbabwe. In Connect project Peter Kuria has focused especially on Kenya.
Maarit Virtanen is Project Manager and Coordinator in environmental projects at Lahti University of Applied Sciences. She holds a MSc (Admin.) degree in Environmental Policy from Tampere University. Maarit Virtanen has working experience from the public and private sectors, with international experience as researcher and environmental and social expert in Papua New Guinea, Vietnam, Lao PDR and Thailand. In Connect project she has focused on Nigeria and South Africa.
Eija Laitinen is Project Coordinator and Lecturer at HAMK University of Applied Sciences. She holds a MSc degree in Agriculture and Forestry from Helsinki University and is about to complete her PhD in Education from Tampere University. Eija Laitinen has been involved in various development
projects in areas of capacity building, rural development, gender, environmental issues and knowledge transfer in several African counties. Her areas of teaching are Global Environmental Issues and Development Co-operation.
Ritva Jäättelä is Senior Lecturer at Laurea University of Applied Sciences. Ritva Jäättelä holds a MSc degree in International Economics from Helsinki School of Economics (Aalto University) and a Vocational Teacher Qualification.
Before joining the University she worked in international trade within the paper industry. International aspects of her career at Laurea UAS include international partnership and joint programme negotiations and EU projects contributing to the international business skills of small companies. In Connect
project her focus has been in Nigeria and South Africa.
THE RENEWABLE ENERGY PROGRAMME
PRESENTED BY
ENGR.(MRS) BAHIJJAHTU ABUBAKAR
NATIONAL COORDINATOR
RENEWABLE ENERGY PROGRAMME (REP),
FEDERAL MINISTRY OF ENVIRONMENT
OF NIGERIA
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.
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
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.
Slack (or Teams) Automation for Bonterra Impact Management (fka Social Soluti...Jeffrey Haguewood
Sidekick Solutions uses Bonterra Impact Management (fka Social Solutions Apricot) and automation solutions to integrate data for business workflows.
We believe integration and automation are essential to user experience and the promise of efficient work through technology. Automation is the critical ingredient to realizing that full vision. We develop integration products and services for Bonterra Case Management software to support the deployment of automations for a variety of use cases.
This video focuses on the notifications, alerts, and approval requests using Slack for Bonterra Impact Management. The solutions covered in this webinar can also be deployed for Microsoft Teams.
Interested in deploying notification automations for Bonterra Impact Management? Contact us at sales@sidekicksolutionsllc.com to discuss next steps.
Smart TV Buyer Insights Survey 2024 by 91mobiles.pdf91mobiles
91mobiles recently conducted a Smart TV Buyer Insights Survey in which we asked over 3,000 respondents about the TV they own, aspects they look at on a new TV, and their TV buying preferences.
GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using Deplo...James Anderson
Effective Application Security in Software Delivery lifecycle using Deployment Firewall and DBOM
The modern software delivery process (or the CI/CD process) includes many tools, distributed teams, open-source code, and cloud platforms. Constant focus on speed to release software to market, along with the traditional slow and manual security checks has caused gaps in continuous security as an important piece in the software supply chain. Today organizations feel more susceptible to external and internal cyber threats due to the vast attack surface in their applications supply chain and the lack of end-to-end governance and risk management.
The software team must secure its software delivery process to avoid vulnerability and security breaches. This needs to be achieved with existing tool chains and without extensive rework of the delivery processes. This talk will present strategies and techniques for providing visibility into the true risk of the existing vulnerabilities, preventing the introduction of security issues in the software, resolving vulnerabilities in production environments quickly, and capturing the deployment bill of materials (DBOM).
Speakers:
Bob Boule
Robert Boule is a technology enthusiast with PASSION for technology and making things work along with a knack for helping others understand how things work. He comes with around 20 years of solution engineering experience in application security, software continuous delivery, and SaaS platforms. He is known for his dynamic presentations in CI/CD and application security integrated in software delivery lifecycle.
Gopinath Rebala
Gopinath Rebala is the CTO of OpsMx, where he has overall responsibility for the machine learning and data processing architectures for Secure Software Delivery. Gopi also has a strong connection with our customers, leading design and architecture for strategic implementations. Gopi is a frequent speaker and well-known leader in continuous delivery and integrating security into software delivery.
The Art of the Pitch: WordPress Relationships and SalesLaura Byrne
Clients don’t know what they don’t know. What web solutions are right for them? How does WordPress come into the picture? How do you make sure you understand scope and timeline? What do you do if sometime changes?
All these questions and more will be explored as we talk about matching clients’ needs with what your agency offers without pulling teeth or pulling your hair out. Practical tips, and strategies for successful relationship building that leads to closing the deal.
GraphRAG is All You need? LLM & Knowledge GraphGuy Korland
Guy Korland, CEO and Co-founder of FalkorDB, will review two articles on the integration of language models with knowledge graphs.
1. Unifying Large Language Models and Knowledge Graphs: A Roadmap.
https://arxiv.org/abs/2306.08302
2. Microsoft Research's GraphRAG paper and a review paper on various uses of knowledge graphs:
https://www.microsoft.com/en-us/research/blog/graphrag-unlocking-llm-discovery-on-narrative-private-data/
Accelerate your Kubernetes clusters with Varnish CachingThijs Feryn
A presentation about the usage and availability of Varnish on Kubernetes. This talk explores the capabilities of Varnish caching and shows how to use the Varnish Helm chart to deploy it to Kubernetes.
This presentation was delivered at K8SUG Singapore. See https://feryn.eu/presentations/accelerate-your-kubernetes-clusters-with-varnish-caching-k8sug-singapore-28-2024 for more details.
State of ICS and IoT Cyber Threat Landscape Report 2024 previewPrayukth K V
The IoT and OT threat landscape report has been prepared by the Threat Research Team at Sectrio using data from Sectrio, cyber threat intelligence farming facilities spread across over 85 cities around the world. In addition, Sectrio also runs AI-based advanced threat and payload engagement facilities that serve as sinks to attract and engage sophisticated threat actors, and newer malware including new variants and latent threats that are at an earlier stage of development.
The latest edition of the OT/ICS and IoT security Threat Landscape Report 2024 also covers:
State of global ICS asset and network exposure
Sectoral targets and attacks as well as the cost of ransom
Global APT activity, AI usage, actor and tactic profiles, and implications
Rise in volumes of AI-powered cyberattacks
Major cyber events in 2024
Malware and malicious payload trends
Cyberattack types and targets
Vulnerability exploit attempts on CVEs
Attacks on counties – USA
Expansion of bot farms – how, where, and why
In-depth analysis of the cyber threat landscape across North America, South America, Europe, APAC, and the Middle East
Why are attacks on smart factories rising?
Cyber risk predictions
Axis of attacks – Europe
Systemic attacks in the Middle East
Download the full report from here:
https://sectrio.com/resources/ot-threat-landscape-reports/sectrio-releases-ot-ics-and-iot-security-threat-landscape-report-2024/
UiPath Test Automation using UiPath Test Suite series, part 4DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 4. In this session, we will cover Test Manager overview along with SAP heatmap.
The UiPath Test Manager overview with SAP heatmap webinar offers a concise yet comprehensive exploration of the role of a Test Manager within SAP environments, coupled with the utilization of heatmaps for effective testing strategies.
Participants will gain insights into the responsibilities, challenges, and best practices associated with test management in SAP projects. Additionally, the webinar delves into the significance of heatmaps as a visual aid for identifying testing priorities, areas of risk, and resource allocation within SAP landscapes. Through this session, attendees can expect to enhance their understanding of test management principles while learning practical approaches to optimize testing processes in SAP environments using heatmap visualization techniques
What will you get from this session?
1. Insights into SAP testing best practices
2. Heatmap utilization for testing
3. Optimization of testing processes
4. Demo
Topics covered:
Execution from the test manager
Orchestrator execution result
Defect reporting
SAP heatmap example with demo
Speaker:
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
Search and Society: Reimagining Information Access for Radical FuturesBhaskar Mitra
The field of Information retrieval (IR) is currently undergoing a transformative shift, at least partly due to the emerging applications of generative AI to information access. In this talk, we will deliberate on the sociotechnical implications of generative AI for information access. We will argue that there is both a critical necessity and an exciting opportunity for the IR community to re-center our research agendas on societal needs while dismantling the artificial separation between the work on fairness, accountability, transparency, and ethics in IR and the rest of IR research. Instead of adopting a reactionary strategy of trying to mitigate potential social harms from emerging technologies, the community should aim to proactively set the research agenda for the kinds of systems we should build inspired by diverse explicitly stated sociotechnical imaginaries. The sociotechnical imaginaries that underpin the design and development of information access technologies needs to be explicitly articulated, and we need to develop theories of change in context of these diverse perspectives. Our guiding future imaginaries must be informed by other academic fields, such as democratic theory and critical theory, and should be co-developed with social science scholars, legal scholars, civil rights and social justice activists, and artists, among others.
Let's dive deeper into the world of ODC! Ricardo Alves (OutSystems) will join us to tell all about the new Data Fabric. After that, Sezen de Bruijn (OutSystems) will get into the details on how to best design a sturdy architecture within ODC.
Neuro-symbolic is not enough, we need neuro-*semantic*Frank van Harmelen
Neuro-symbolic (NeSy) AI is on the rise. However, simply machine learning on just any symbolic structure is not sufficient to really harvest the gains of NeSy. These will only be gained when the symbolic structures have an actual semantics. I give an operational definition of semantics as “predictable inference”.
All of this illustrated with link prediction over knowledge graphs, but the argument is general.
Connector Corner: Automate dynamic content and events by pushing a buttonDianaGray10
Here is something new! In our next Connector Corner webinar, we will demonstrate how you can use a single workflow to:
Create a campaign using Mailchimp with merge tags/fields
Send an interactive Slack channel message (using buttons)
Have the message received by managers and peers along with a test email for review
But there’s more:
In a second workflow supporting the same use case, you’ll see:
Your campaign sent to target colleagues for approval
If the “Approve” button is clicked, a Jira/Zendesk ticket is created for the marketing design team
But—if the “Reject” button is pushed, colleagues will be alerted via Slack message
Join us to learn more about this new, human-in-the-loop capability, brought to you by Integration Service connectors.
And...
Speakers:
Akshay Agnihotri, Product Manager
Charlie Greenberg, Host
From Siloed Products to Connected Ecosystem: Building a Sustainable and Scala...
LIGHT FIDELITY TECHNOLOGY (LI FI)
1. LIGHT FIDELITY TECHNOLOGY (LI FI)
Introduction
LiFi is transmission of data through illumination by taking the fibre out of fibre optics by
sending data through a LED light bulb that varies in intensity faster than the human eye can
follow. 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.
Li-Fi is a Visible Light Communication (VLC), technology developed by a team of scientists
including Dr Gordon Povey, Prof. Harald Haas and Dr Mostafa Afgani at the University of
Edinburgh. The term Li-Fi was coined by Prof. Haas when he amazed people by streaming
high-definition video from a standard LED lamp, at TED Global in July 2011. Li-Fi is now
part of the Visible Light Communications (VLC) PAN IEEE 802.15.7 standard.
This technology uses a part of the electromagnetic spectrum that is still not greatly utilized
i.e. the “Visible Spectrum”.
Li-Fi, as it has been named, has already achieved blisteringly high speeds in the lab.
Researchers at the Heinrich Hertz Institute in Berlin, Germany, have reached data rates of
over 500 megabytes per second using a standard white-light LED. Although, it is also
believed that Li-Fi can provide more than 10 Gbps, theoretically allowing a high-definition
film to be downloaded in 30 seconds.
2. LI FI Construction
The LI FI product consists of 4 primary sub-assemblies:
• Bulb
• RF power amplifier circuit (PA)
• Printed circuit board (PCB)
• Enclosure
The PCB controls the electrical inputs and outputs of the lamp and houses the microcontroller
used to manage different lamp functions. A radio-frequency (RF) signal is generated by the
solid-state PA and is guided into an electric field about the bulb. The high concentration of
energy in the electric field vaporizes the contents of the bulb to a plasma state at the bulb’s
centre; this controlled plasma generates an intense source of light. All of these subassemblies
are contained in an aluminium enclosure.
LI FI Block Diagram
How Li-Fi Works?
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.
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. The operational procedure is very
simple-, if the LED is on, you transmit a digital 1, if it’s off you transmit a 0. The LEDs
can be switched on and off very quickly, which gives nice opportunities for transmitting data.
3. Hence all that is required is some LEDs and a controller that code data into those LEDs. All
one has to do is to vary the rate at which the LED’s flicker depending upon the data we want
to encode.
Further enhancements can be made in this method, like using an array of 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.
Advantages
1. Green information technology
Unlike radio-waves and other communication waves having an effect on the birds, human
bodies etc, Li-Fi never gives such side effects on any living thing. This phenomenon has been
termed as Green information technology and can be extensively used to avoid ill effects of
radio waves.
2. Free From Frequency Bandwidth Problem
Li-fi is a communication medium in the form of light, so there is nothing to worry about the
frequency bandwidth problem. It can utilize the unutilized spectrum resulting in lesser costs
of communication and lesser licensing issues.
3. Increased Communication Safety
Due to visual light communication, the node or any terminal attached to our network is
visible to the other hosts enabling safer channels for communication.
4. Multi User Communication
Li-Fi supports the broadcasting of network helping to share multiple resources at a single
instance called broadcasting server.
Future Scope
1. Li-Fi can be used in the places where it is difficult to lay the optical fibre like
hospitals.
2. In operation theatre Li-Fi can be used for modern medical instruments.
3. In traffic signals Li-Fi can be used which will communicate with the LED lights of
the cars and accident numbers can be decreased.
4. Thousand and millions of street lamps can be transferred to LiFi lamps to
transfer data providing internet connectivity using visual light communication..
5. Li-Fi can also be used in aircrafts for noise free and secure data transmission.
4. 6. It can be used in petroleum chemical or power plants where other transmission or
frequencies can be hazardous.
Conclusion
The Li-Fi technology has numerous opportunities of research and this segment can be
explored further. If the technology is put into practical use, every bulb can be used something
like a Wi-Fi hotspot to transmit wireless data. This will help us to proceed towards the
cleaner, greener, safer and brighter future. The concept of Li-Fi is currently attracting a great
deal of interest, not least because it may offer a genuine and very efficient alternative to
radio-based wireless.