Li-Fi- Data transmission through leds;Introduced by Harald Haas
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The document discusses the technology of Li-Fi, which stands for Light Fidelity. Li-Fi uses visible light communication and LED bulbs to transmit data wirelessly. It provides some advantages over traditional Wi-Fi such as higher bandwidth, lower cost of implementation, and not interfering with other wireless technologies. The document outlines the history of Li-Fi, how it works by varying the intensity of LED lights, modulation techniques used, applications like smart lighting and vehicle communication, and limitations around line of sight transmission.
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A new report published by Allied Market Research, titled, Light Fidelity (Li-Fi)/Visible Light Communication Market - Global Opportunity Analysis and Industry Forecast, 2014 - 2022, suggests that the global Li-Fi market is expected to reach $115 billion by 2022, growing at a CAGR of 116.8% from 2016 to 2022. In 2015, North America contributed major share in the market and will continue to lead throughout the forecast period.
Light Fidelity (Li-Fi) is a very high speed, two-way wireless communication method which uses visible light from LEDs as the medium for transmitting the data by turning them on and off at very high frequency which human eyes cannot sense. This technology is an apt replacement for currently prevailing Wi-Fi technology as Li-Fi is considerably faster, has almost 10,000 times broader bandwidth because it uses visible light, and it is safe to operate in electromagnetic sensitive areasLiFi Visible light Communication technology
Li-Fi uses visible light communication and LED bulbs to transmit data wirelessly. It works by switching LED bulbs on and off very quickly, with each flash representing a binary 1 or 0. This allows for transmission of data at high speeds of up to 10 GBps. Li-Fi has several advantages over traditional Wi-Fi including higher speeds, more available bandwidth, more secure connections, and energy efficiency. Potential applications of Li-Fi include use in devices like laptops, smartphones, and LED light bulbs to create wireless hotspots or networks. However, Li-Fi also faces challenges such as interference from other light sources and requiring line of sight between transmitters and receivers. Ongoing research continues to work on
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This document discusses Li-Fi technology, which uses visible light communication to transmit data wirelessly using LED lights. It was invented in 2011 by Harald Haas and provides data rates over 1 Gbps, much faster than traditional Wi-Fi. Li-Fi works by converting digital data into light pulses that can then be detected by a photodetector. It has many applications including smart lighting, mobile connectivity, and areas where radio waves are restricted. The technology is still developing but promises a greener alternative to radio-based wireless networks.
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This document discusses Li-Fi technology, which uses visible light communication to transmit data wirelessly using LED lights. It was invented in 2011 by Harald Haas and provides data rates over 1 Gbps, much faster than traditional Wi-Fi. Li-Fi works by converting digital data into light pulses that can then be detected by a photodetector. It has many applications including smart lighting, mobile connectivity, and areas where radio waves are restricted. The technology is still developing but promises a greener alternative to radio-based wireless networks.
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This document provides an overview of Li-Fi technology. It begins with defining Li-Fi as a wireless technology that uses light from LED bulbs to transmit data. The document then discusses the history of Li-Fi, which was first proposed in 2004 by Harald Haas. It explains how Li-Fi works by modulating the intensity of light from an LED bulb to transmit bits. The document compares Li-Fi to Wi-Fi, noting Li-Fi has advantages like higher security, bandwidth and energy efficiency. Potential applications of Li-Fi include use in aircraft, hospitals and traffic lights. Limitations include inability to work in darkness and potential interference from light sources. Future developments could make Li-Fi an efficient alternative to
Lifi abhishek
This document provides an overview of Li-Fi technology. It discusses the history of Li-Fi beginning in the 1990s, how it uses visible light spectrum instead of radio waves, and the basic construction and working process. Key differences between Li-Fi and Wi-Fi are explained. Current applications are seen in traffic lights, hospitals, and airlines. Challenges include light not passing through objects and interference from other light sources. The conclusion discusses future potential as every light bulb could act as a wireless access point.
Li fi technology by milton james
Li-Fi is a wireless communication technology that uses light to transfer data. It can transmit data at speeds greater than 10 Gbps. Li-Fi was first conceived in the 1990s but development increased in the 2010s. The first Li-Fi product, Li-Fi 1st, had speeds up to 5 Mbps. Later products like Li-Flame turned LED bulbs into wireless access points. The Li-Fi market is estimated to reach $6 billion by 2018. Li-Fi uses visible light communication instead of radio waves, making it more secure, have higher bandwidth, and avoid health risks of radio waves. It works by transmitting data through rapid changes in the intensity of light from an LED bulb that is detected
LiFi
This document provides an overview of visible light communications (VLC), also known as Li-Fi. It discusses the history and invention of VLC, how VLC works by transmitting data through light bulb illumination at speeds too fast for the human eye to detect, its advantages over Wi-Fi like high security and availability anywhere light is present, and potential applications including use in traffic lights, hospitals, airplanes and underwater. The document also outlines the components needed for a VLC system including LEDs, photodiodes and control circuitry, and discusses future developments and limitations such as the need for line of sight transmission.
What is Li-Fi ?
What is Li-Fi ?
Light-Fidelity
LI-FI 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
This document discusses Li-fi technology, which uses LED light bulbs to transmit data wirelessly. It begins with an introduction to Li-fi and how it works by varying the intensity of light faster than the human eye can detect. The history of Li-fi development is then outlined, along with the present need for alternatives to radio spectrum. The document explains how Li-fi works and compares it to Wi-fi. Advantages of Li-fi include high data rates, security, and lack of health effects. Applications that could benefit from Li-fi are also proposed, such as traffic lights, hospitals, and street lamps providing wireless access.
Similar to Li-Fi- Data transmission through leds;Introduced by Harald Haas (20)
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Li-Fi- Data transmission through leds;Introduced by Harald Haas
- 1. COLLEGE OF ENGINEERING,POONJAR Guided by Chrisly Issac Asst. Professsor ECE Department Presented by Abhijith Uthaman EC VII, Roll No: 1 ECE LI-FI: INFORMATION TRANSFERRING THROUGH LEDS
- 4. TOPIC WHAT IS LIFI WHY LIFI HISTORY WORKING LI-FI VS WI-FI IMPLEMENTATION MODULATION TECHNIQUES ADVANTAGES APPLICATIONS LIMITATIONS CONCLUSION REFERENCES CONTENTS Li-Fi Slide no:4
- 6. What is Li-Fi ? Li-Fi Slide no:6
- 7. • Li-Fi is transmission of data through illumination . • i.e sending data through an LED light bulb that varies in intensity faster than human eye can follow. Li-Fi Slide no:7
- 8. Why Li-Fi ? Radio Spectrum is congested but the demand for wireless data double each year .Every thing, it seems want to use wireless data but the capacity is drying up. 1.4 Million Base Stations 5 Billion Li-Fi Slide no:8
- 9. •He introduced the idea of ‘wireless data from every light’. History •In 2011, professor Harald Hass introduced the term ‘Li-Fi’ , in the TED global talk Li-Fi Slide no:9
- 10. WI-FI LI-FI Electromagnetic spectrum Li-Fi Slide no:10
- 11. WORKING •Works by switching the bulb on and off within nanoseconds •Too quick to be noticed by human eye •On state implies 1 •Off state implies 0 Li-Fi Slide no:11
- 12. •High brightness LED acts as transmitter •Si photodiode shows good response to visible light region; acts as receiver Li-Fi Slide no:12
- 14. Fig. Working of Li-Fi Li-Fi Slide no:14
- 16. Why Li-Fi over Wi-Fi? Li-Fi Slide no:16
- 17. CURRENT RADIO SPECTRUM-ISSUES Radio waves Cost and Expensive Less Bandwidth compared to other spectrums Insufficient spectrum for increasing data Millions of base stations consume huge amount of energy for •Transmitting the radio waves •To cool the base station cabins •5% Efficiency Available within the range of Base stations Limited availability Unavailable in aircrafts Less secure(passes through the walls) Li-Fi Slide no:17
- 18. Table 1: Wi-Fi vs Li-Fi Li-Fi Slide no:18
- 19. IMPLEMENTATION – LARGE SCALE Internet Data feed PLC (Power line comm.) VLC Visible Light Comm. ISP Li-Fi Slide no:19
- 20. MODULATION TECHNIQUES Li-Fi Slide no:20
- 22. APPLICATIONS Vehicles and Transportation Location Based Services RF Spectrum relief Underwater communication Hospitals and Healthcare Mobile connectivity Aviation Hazardous environment Smart lighting Li-Fi Slide no:22
- 23. LIMITATIONS & CHALLENGES •Light can't pass through objects. •Interferences from external light sources like sun light, normal bulbs, and opaque materials in the path of transmission will cause interruption in the communication. •Li-Fi requires line of sight. •A major challenge facing Li-Fi is how the receiving device will transmit back to transmitter. Li-Fi Slide no:23
- 24. CONCLUSION The possibilities are numerous and can be explored further. If this technology can be put into practical use, every bulb can be used something like a Li-Fi hotspots to transmit wireless data. Li-Fi Slide no:24
- 25. REFERENCES [1]International Conference on Electrical, Electronics, and Optimization Techniques (ICEEOT) – 2016;LI-FI: information transferring through led’s ;Anshu Adwani , Smita Nagtode [2] IEEE Standard for Local and Metropolitan Area Networks--Part 15.7: Short-Range Wireless Optical Communication Using Visible Light, pp. 1– 309, Sept.2011. [3] http://beyondweblogs.com/what-is-li-fi-is-this-replacing- Wi-Fi/ [4] http://www.purelifi.com [5] T. Komine and M. Nakagawa, “Integrated system of white LED visiblelight communication and power-line communication,” IEEE Trans. Consum. Electron, vol. 49, pp. 71–79, Feb. 2003 [6] http://www.lifi.eng.ed.ac.uk/ Li-Fi Slide no:25