LIFI TECHNOLOGY
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This document provides an overview of Li-fi technology. It defines Li-fi as using light to transmit data through LED bulbs. The construction includes a bulb, power amplifier circuit board, and enclosure. Data is encoded by varying the LED flickering rate. Li-fi has advantages over Wi-Fi like higher speeds, lower costs, and using the visible light spectrum. Applications include using street lights as access points. In conclusion, Li-fi could provide wireless access through every light bulb.
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Li fi
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 several advantages over radio-based wireless including increased security, no interference with other devices, and support for multiple users simultaneously. Li-Fi works by varying the intensity of LED light fast enough for the human eye not to detect flickering, and this signal can be received by a photodetector. It has potential applications in areas where radio signals are not desired or possible.
LI-FI
Li-Fi is a wireless optical networking technology that uses LED light bulbs for data transmission. It can transmit data through visible light communication at speeds up to 10Gbps. Li-Fi uses light instead of radio waves to transmit information and has advantages over Wi-Fi such as higher speeds, low costs, and large bandwidth. However, it requires line of sight between the light source and receiver and cannot penetrate walls. Potential applications of Li-Fi include use in homes, offices, hospitals and aviation.
li-fi technology
This document summarizes a seminar presentation on Li-Fi technology. It begins with an introduction explaining that Li-Fi uses LED light bulbs to transmit data wirelessly using visible light communication. It then explains how Li-Fi works by modulating data onto the light from LED bulbs. The document compares Li-Fi to Wi-Fi, noting Li-Fi's higher speeds and more localized coverage. It discusses real-world applications of Li-Fi including on airplanes and underwater. The document concludes by outlining advantages like high speeds and security, as well as challenges like limited range through obstacles.
Lifi(light fidelity)
LIFI (Light Fidelity) is a new technology that uses visible light communication for wireless transmission of data using LED light bulbs. It was introduced by Professor Harald Haas at the University of Edinburgh. LIFI provides illumination as well as high-speed wireless communication and has advantages over WiFi such as higher speed, more secure transmission, lower cost, and an unregulated and vast light spectrum. However, it also faces challenges of light not penetrating solid objects and interference from other light sources. Potential applications of LIFI include use in airplanes, traffic lights, street lamps, and industries where radio transmissions are restricted.
LiFi Technology - Unfolding Future
LiFi uses visible light communication (VLC) to transmit data wirelessly using light waves instead of radio waves. It provides higher speeds than WiFi, with download speeds up to 100Gbps for LiFi compared to 10Gbps for WiFi. LiFi is also more secure, provides non-line-of-sight communication, and has benefits like reduced costs due to using existing LED lighting infrastructure. While initial installation costs may be higher, LiFi systems can become cheaper than WiFi over time. LiFi has potential applications in dense urban environments, transportation, healthcare, and other industries.
Slide on lifi
LiFi is a wireless communication technology that uses visible light communication through LED light bulbs to transmit data. It works by switching LED bulbs on and off very fast to transmit digital signals. A photodetector registers binary ones and zeros to receive messages. LiFi provides wireless connectivity and data transmission rates over 1 Gbps. It has applications in healthcare due to lack of electromagnetic interference, smart lighting through integrating connectivity into lighting infrastructure, and vehicle connectivity through LED headlights and taillights. Limitations include inability to transmit through walls and need for direct line of sight between transmitter and receiver.
LiFi an alternate for WiFi
It is a presentation on LiFi technology which is an new high tech alternate for WiFi. It is still in developing stage but the idea was neat and worth knowing.
Li-Fi Technology (Perfect slides)
This document provides an overview of Li-Fi technology through a presentation on the topic. It discusses the history of Li-Fi, how it works by transmitting data through LED light, its advantages over Wi-Fi such as higher bandwidth and more secure communication through visible light. Example applications are given such as using traffic lights and street lamps to transmit data. Challenges for Li-Fi are also noted, such as the need for line of sight transmission and potential interference from other light sources.
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Li fi
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 several advantages over radio-based wireless including increased security, no interference with other devices, and support for multiple users simultaneously. Li-Fi works by varying the intensity of LED light fast enough for the human eye not to detect flickering, and this signal can be received by a photodetector. It has potential applications in areas where radio signals are not desired or possible.
LI-FI
Li-Fi is a wireless optical networking technology that uses LED light bulbs for data transmission. It can transmit data through visible light communication at speeds up to 10Gbps. Li-Fi uses light instead of radio waves to transmit information and has advantages over Wi-Fi such as higher speeds, low costs, and large bandwidth. However, it requires line of sight between the light source and receiver and cannot penetrate walls. Potential applications of Li-Fi include use in homes, offices, hospitals and aviation.
li-fi technology
This document summarizes a seminar presentation on Li-Fi technology. It begins with an introduction explaining that Li-Fi uses LED light bulbs to transmit data wirelessly using visible light communication. It then explains how Li-Fi works by modulating data onto the light from LED bulbs. The document compares Li-Fi to Wi-Fi, noting Li-Fi's higher speeds and more localized coverage. It discusses real-world applications of Li-Fi including on airplanes and underwater. The document concludes by outlining advantages like high speeds and security, as well as challenges like limited range through obstacles.
Lifi(light fidelity)
LIFI (Light Fidelity) is a new technology that uses visible light communication for wireless transmission of data using LED light bulbs. It was introduced by Professor Harald Haas at the University of Edinburgh. LIFI provides illumination as well as high-speed wireless communication and has advantages over WiFi such as higher speed, more secure transmission, lower cost, and an unregulated and vast light spectrum. However, it also faces challenges of light not penetrating solid objects and interference from other light sources. Potential applications of LIFI include use in airplanes, traffic lights, street lamps, and industries where radio transmissions are restricted.
LiFi Technology - Unfolding Future
LiFi uses visible light communication (VLC) to transmit data wirelessly using light waves instead of radio waves. It provides higher speeds than WiFi, with download speeds up to 100Gbps for LiFi compared to 10Gbps for WiFi. LiFi is also more secure, provides non-line-of-sight communication, and has benefits like reduced costs due to using existing LED lighting infrastructure. While initial installation costs may be higher, LiFi systems can become cheaper than WiFi over time. LiFi has potential applications in dense urban environments, transportation, healthcare, and other industries.
Slide on lifi
LiFi is a wireless communication technology that uses visible light communication through LED light bulbs to transmit data. It works by switching LED bulbs on and off very fast to transmit digital signals. A photodetector registers binary ones and zeros to receive messages. LiFi provides wireless connectivity and data transmission rates over 1 Gbps. It has applications in healthcare due to lack of electromagnetic interference, smart lighting through integrating connectivity into lighting infrastructure, and vehicle connectivity through LED headlights and taillights. Limitations include inability to transmit through walls and need for direct line of sight between transmitter and receiver.
LiFi an alternate for WiFi
It is a presentation on LiFi technology which is an new high tech alternate for WiFi. It is still in developing stage but the idea was neat and worth knowing.
Li-Fi Technology (Perfect slides)
This document provides an overview of Li-Fi technology through a presentation on the topic. It discusses the history of Li-Fi, how it works by transmitting data through LED light, its advantages over Wi-Fi such as higher bandwidth and more secure communication through visible light. Example applications are given such as using traffic lights and street lamps to transmit data. Challenges for Li-Fi are also noted, such as the need for line of sight transmission and potential interference from other light sources.
Light Fidelity (Audio streaming via Li Fi)
Stereo Audio Streaming via visible light. We can transfer Audio signal from mobile phone and Human voice via mic
LIFI
Li-Fi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission. It can provide higher data rates than Wi-Fi and has advantages like highly localized coverage so data cannot pass through walls, lower energy consumption than Wi-Fi, and ability to use existing light infrastructure. Li-Fi works by varying the intensity of light from an LED to transmit digital data. A photo detector at the receiver converts light intensity variations back into an electrical signal and data. Potential applications of Li-Fi include use in aircraft, hospitals and other places where Wi-Fi is restricted.
Li fi
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.
Here a practical circuit to transfer audio signal is implemented
Li fi Technology
This document provides an overview of Li-Fi technology. It discusses the history of Li-Fi, invented by Dr. Harald Haas in 2011, how it works using LED lights to transmit data, comparisons to Wi-Fi, applications in traffic control and airlines, advantages like using visible light spectrum for high speed data transfer, and limitations such as needing line of sight and not penetrating solid objects. The conclusion envisions a future where every light bulb is a wireless hotspot for cleaner, greener and safer connectivity.
Li-Fi
Li-Fi is a wireless communication system that uses light from LED bulbs to transmit data. It works by varying the intensity of LED lights faster than the human eye can see to encode binary digits. Li-Fi provides wireless internet connectivity through visible light and has several advantages over traditional Wi-Fi, including much higher data densities and speeds up to 1 Gbps. It could be used in applications such as hospitals, airplanes, and underwater where radio frequencies face interference issues.
Li fi alpna singh
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.
LiFi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission.
Li-Fi based data transfer in underwater system.
LiFi can be used for underwater data transmission using light as the medium. It works by transmitting data using the flickering of an LED, where on and off represents 1s and 0s. This allows data transfer rates of hundreds of Mbps. LiFi has applications for underwater communication between submarines, for fisherman security to send distress signals, and for defense operations to transmit information about unknown ships. It can also be used to transmit speech between deep sea divers. LiFi provides a cost effective alternative to existing underwater communication techniques.
Li fi technology
Li-Fi (Light Fidelity) is a new technology that uses visible light communication for wireless transmission of data using light-emitting diodes (LEDs). LEDs can be switched on and off at extremely high speeds to transmit digital signals. A controller is connected to LED bulbs to encode data onto the light. Researchers have achieved data rates over 500 megabytes per second using white LED lights. Li-Fi provides higher speeds, is more secure, has a larger spectrum range than Wi-Fi, and has applications for vehicles, traffic lights, street lamps, airplanes, and hospitals.
Li-Fi a complete presentation
Li-Fi is a technology that uses light from LED bulbs to transmit data wirelessly. It provides a more efficient alternative to Wi-Fi by using visible light that has a much larger and underutilized spectrum than radio frequencies. Li-Fi works by varying the intensity of light from an LED faster than the human eye can detect to transmit digital signals. It has advantages over Wi-Fi like higher speed, more available spectrum, more security since light cannot pass through walls easily, and energy efficiency since it uses LED bulbs. Potential applications of Li-Fi include use in places where Wi-Fi is restricted like hospitals or aircraft.
Lifi
Li-Fi is a technology that uses light from LED bulbs to transmit data wirelessly. It provides high-speed connectivity and is seen as a supplement to Wi-Fi networks. The document traces the history of Li-Fi from experiments in the 1990s to recent demonstrations of speeds over 100Mbps. It describes how Li-Fi works by switching LED bulbs on and off very fast to transmit binary code. Potential applications include use in vehicles, airplanes, hospitals and underwater. While Li-Fi has limitations like inability to pass through walls, it could provide connectivity through devices like street lamps at a low cost.
Light Fedility PPT
Li-Fi is a visible light communication technology that uses light from LED bulbs to transmit data wirelessly. It was developed by Professor Harald Haas and his team at the University of Edinburgh. Li-Fi uses photo detectors and LED bulbs that can be switched on and off faster than the human eye can detect to transmit data. It provides wireless connections up to 10 times faster than Wi-Fi and has advantages like no interference from radio waves, higher security since light cannot pass through walls, and potential use in environments where Wi-Fi is restricted. Some applications of Li-Fi include use in traffic lights, hospitals, airplanes, and underwater communications.
Lifi final
LIFI (Light Fidelity) is a technology that uses visible light communication and infrared light to transmit data using LED light bulbs. It provides wireless communication that is similar to WiFi but uses the light spectrum instead of radio frequencies. LIFI has several advantages over WiFi like higher speed, more secure connections, and an unregulated spectrum. However, its signals cannot pass through walls like radio waves, so each room would need its own connected light source. LIFI could be used in applications like traffic lights communicating with cars, in airplanes where WiFi is restricted, and in places that need fast and secure data transmission.
lifi
This document discusses Li-Fi (Light Fidelity), a technology that uses visible light communication for wireless transmission of data. It provides a brief history of Li-Fi, noting it was introduced by Professor Harold Haas in 2011. The document outlines issues with current radio spectrum use and how Li-Fi provides a solution using visible light. It describes the basic working of Li-Fi technology and its advantages over Wi-Fi such as higher speeds, stronger security, and free spectrum. Limitations including inability to work in darkness and potential interference are also covered. The document concludes Li-Fi possibilities can be further explored.
Lifi
Li-Fi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission. It provides high-speed communication in a manner similar to Wi-Fi but uses light rather than radio waves. Li-Fi offers benefits over Wi-Fi such as higher speed, increased security, and availability in contexts where radio waves are regulated. Some potential applications of Li-Fi include underwater communications, use in hospitals, and internet access points anywhere that light is available such as from street lamps.
Li fi
This is the best presentation i am providing to all the students, professionals and others. It will give you all a clear picture about what actually this Li-Fi technology is. This is also a easy guide to the students who are taking presentations or seminar based on this topic. LiFi is the next generation epic technology that would totally change the world to a new era which is fully occupied with the light as source for everything..........I REPEAT LIGHT AS SOURCE FOR EVERYTHING
Lifi by krce
Li-Fi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission. It was introduced by Professor Harald Haas in 2011 as a faster and more secure alternative to Wi-Fi. Li-Fi uses visible light communication and is capable of transmission speeds over 100 times faster than Wi-Fi. It provides several advantages over Wi-Fi such as higher speed, more bandwidth availability, more secure communication, and energy efficiency. While Li-Fi remains a promising technology, it faces limitations including inability to pass through opaque objects and potential external light interference.
Li-fi Presentation by Debika sadhukhan
Li-Fi uses visible light communication and LED bulbs to deliver broadband internet and wireless connectivity. It provides higher speeds, greater capacity, and more secure access than traditional Wi-Fi. While under continued research, Li-Fi holds potential economic benefits through reduced costs compared to Wi-Fi and its ability to take advantage of LED lighting that is expected to become ubiquitous. However, challenges remain regarding external light interference and modifications needed for power grid connections and uplinks.
Lifi technology
Li-Fi is a technology that uses light from LED bulbs to transmit data wirelessly. It works by varying the intensity of the light faster than what the human eye can detect. Li-Fi provides wireless connectivity that is much faster than Wi-Fi, with speeds over 1Gbps. It uses visible light within the electromagnetic spectrum instead of radio waves. Li-Fi has advantages over Wi-Fi like increased bandwidth capacity since light spectrum is much larger than radio waves. Potential applications of Li-Fi include use in hazardous environments like hospitals, on aircraft or underwater communications since it avoids issues with radio frequencies in these areas. Future developments could see every light bulb acting as a wireless hotspot to provide connectivity wherever there is light.
Li-FI (NEW)
Li-Fi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission. It is a subset of optical wireless communication that allows for high-speed communication in a manner similar to Wi-Fi. Li-Fi provides higher speeds, greater security, and does not cause any interference with other wireless networks. The document discusses how Li-Fi works using visible light spectrum and LEDs for transmitting and receiving data. It also outlines some advantages like green technology and availability of lighting as hotspots, as well as disadvantages such as line of sight requirement and inability to work in darkness. Potential applications mentioned are underwater communications and location tracking using LEDs.
Li-fi technology presentation
Li-Fi is a technology for wireless communication using light to transmit data and position information. It was invented by Harald Haas at the University of Edinburgh in 2011. Li-Fi uses light-emitting diodes (LEDs) that can be switched on and off at an extremely high speed to transmit data over the visible light spectrum. The LEDs would act as transmitters, while photodetectors act as receivers. Compared to Wi-Fi, Li-Fi has a faster transmission speed of up to 1Gbps, a broader spectrum range, and no interference issues. Potential applications of Li-Fi include use in vehicles, traffic lights, airplanes, underwater, and hospitals due to its availability, efficiency,
DATA TRANSMISSION USING LIFI TECHNOLOGY
This document proposes an eco-friendly audio data transmission system using visible light communication (VLC) through white LEDs. It consists of a transmitter circuit that encodes audio signals onto the LEDs and a receiver circuit containing a solar panel, amplifier, and speaker to recover and playback the audio signals. The system provides a wireless alternative to existing RF-based systems with benefits of higher bandwidth, data rates, and energy efficiency while avoiding interference, high power consumption, and environmental hazards of RF. It is intended for transmitting audio between devices in a household setting.
DATA TRANSMISSION USING LIFI TECHNOLOGY
The document describes a proposed eco-friendly visible light communication (VLC) system that uses white LED lights to transmit audio signals. In the proposed system, a microcontroller and VLC module in the transmitter encode audio and modulate the white LEDs. At the receiver, a solar panel harvests light from the LEDs and provides power to an amplifier and speaker to recover and playback the original audio signal without other power supplies. The system offers advantages over existing RF-based systems like lower interference, power consumption, and installation costs while being more environmentally friendly.
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Light Fidelity (Audio streaming via Li Fi)
Stereo Audio Streaming via visible light. We can transfer Audio signal from mobile phone and Human voice via mic
LIFI
Li-Fi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission. It can provide higher data rates than Wi-Fi and has advantages like highly localized coverage so data cannot pass through walls, lower energy consumption than Wi-Fi, and ability to use existing light infrastructure. Li-Fi works by varying the intensity of light from an LED to transmit digital data. A photo detector at the receiver converts light intensity variations back into an electrical signal and data. Potential applications of Li-Fi include use in aircraft, hospitals and other places where Wi-Fi is restricted.
Li fi
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.
Here a practical circuit to transfer audio signal is implemented
Li fi Technology
This document provides an overview of Li-Fi technology. It discusses the history of Li-Fi, invented by Dr. Harald Haas in 2011, how it works using LED lights to transmit data, comparisons to Wi-Fi, applications in traffic control and airlines, advantages like using visible light spectrum for high speed data transfer, and limitations such as needing line of sight and not penetrating solid objects. The conclusion envisions a future where every light bulb is a wireless hotspot for cleaner, greener and safer connectivity.
Li-Fi
Li-Fi is a wireless communication system that uses light from LED bulbs to transmit data. It works by varying the intensity of LED lights faster than the human eye can see to encode binary digits. Li-Fi provides wireless internet connectivity through visible light and has several advantages over traditional Wi-Fi, including much higher data densities and speeds up to 1 Gbps. It could be used in applications such as hospitals, airplanes, and underwater where radio frequencies face interference issues.
Li fi alpna singh
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.
LiFi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission.
Li-Fi based data transfer in underwater system.
LiFi can be used for underwater data transmission using light as the medium. It works by transmitting data using the flickering of an LED, where on and off represents 1s and 0s. This allows data transfer rates of hundreds of Mbps. LiFi has applications for underwater communication between submarines, for fisherman security to send distress signals, and for defense operations to transmit information about unknown ships. It can also be used to transmit speech between deep sea divers. LiFi provides a cost effective alternative to existing underwater communication techniques.
Li fi technology
Li-Fi (Light Fidelity) is a new technology that uses visible light communication for wireless transmission of data using light-emitting diodes (LEDs). LEDs can be switched on and off at extremely high speeds to transmit digital signals. A controller is connected to LED bulbs to encode data onto the light. Researchers have achieved data rates over 500 megabytes per second using white LED lights. Li-Fi provides higher speeds, is more secure, has a larger spectrum range than Wi-Fi, and has applications for vehicles, traffic lights, street lamps, airplanes, and hospitals.
Li-Fi a complete presentation
Li-Fi is a technology that uses light from LED bulbs to transmit data wirelessly. It provides a more efficient alternative to Wi-Fi by using visible light that has a much larger and underutilized spectrum than radio frequencies. Li-Fi works by varying the intensity of light from an LED faster than the human eye can detect to transmit digital signals. It has advantages over Wi-Fi like higher speed, more available spectrum, more security since light cannot pass through walls easily, and energy efficiency since it uses LED bulbs. Potential applications of Li-Fi include use in places where Wi-Fi is restricted like hospitals or aircraft.
Lifi
Li-Fi is a technology that uses light from LED bulbs to transmit data wirelessly. It provides high-speed connectivity and is seen as a supplement to Wi-Fi networks. The document traces the history of Li-Fi from experiments in the 1990s to recent demonstrations of speeds over 100Mbps. It describes how Li-Fi works by switching LED bulbs on and off very fast to transmit binary code. Potential applications include use in vehicles, airplanes, hospitals and underwater. While Li-Fi has limitations like inability to pass through walls, it could provide connectivity through devices like street lamps at a low cost.
Light Fedility PPT
Li-Fi is a visible light communication technology that uses light from LED bulbs to transmit data wirelessly. It was developed by Professor Harald Haas and his team at the University of Edinburgh. Li-Fi uses photo detectors and LED bulbs that can be switched on and off faster than the human eye can detect to transmit data. It provides wireless connections up to 10 times faster than Wi-Fi and has advantages like no interference from radio waves, higher security since light cannot pass through walls, and potential use in environments where Wi-Fi is restricted. Some applications of Li-Fi include use in traffic lights, hospitals, airplanes, and underwater communications.
Lifi final
LIFI (Light Fidelity) is a technology that uses visible light communication and infrared light to transmit data using LED light bulbs. It provides wireless communication that is similar to WiFi but uses the light spectrum instead of radio frequencies. LIFI has several advantages over WiFi like higher speed, more secure connections, and an unregulated spectrum. However, its signals cannot pass through walls like radio waves, so each room would need its own connected light source. LIFI could be used in applications like traffic lights communicating with cars, in airplanes where WiFi is restricted, and in places that need fast and secure data transmission.
lifi
This document discusses Li-Fi (Light Fidelity), a technology that uses visible light communication for wireless transmission of data. It provides a brief history of Li-Fi, noting it was introduced by Professor Harold Haas in 2011. The document outlines issues with current radio spectrum use and how Li-Fi provides a solution using visible light. It describes the basic working of Li-Fi technology and its advantages over Wi-Fi such as higher speeds, stronger security, and free spectrum. Limitations including inability to work in darkness and potential interference are also covered. The document concludes Li-Fi possibilities can be further explored.
Lifi
Li-Fi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission. It provides high-speed communication in a manner similar to Wi-Fi but uses light rather than radio waves. Li-Fi offers benefits over Wi-Fi such as higher speed, increased security, and availability in contexts where radio waves are regulated. Some potential applications of Li-Fi include underwater communications, use in hospitals, and internet access points anywhere that light is available such as from street lamps.
Li fi
This is the best presentation i am providing to all the students, professionals and others. It will give you all a clear picture about what actually this Li-Fi technology is. This is also a easy guide to the students who are taking presentations or seminar based on this topic. LiFi is the next generation epic technology that would totally change the world to a new era which is fully occupied with the light as source for everything..........I REPEAT LIGHT AS SOURCE FOR EVERYTHING
Lifi by krce
Li-Fi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission. It was introduced by Professor Harald Haas in 2011 as a faster and more secure alternative to Wi-Fi. Li-Fi uses visible light communication and is capable of transmission speeds over 100 times faster than Wi-Fi. It provides several advantages over Wi-Fi such as higher speed, more bandwidth availability, more secure communication, and energy efficiency. While Li-Fi remains a promising technology, it faces limitations including inability to pass through opaque objects and potential external light interference.
Li-fi Presentation by Debika sadhukhan
Li-Fi uses visible light communication and LED bulbs to deliver broadband internet and wireless connectivity. It provides higher speeds, greater capacity, and more secure access than traditional Wi-Fi. While under continued research, Li-Fi holds potential economic benefits through reduced costs compared to Wi-Fi and its ability to take advantage of LED lighting that is expected to become ubiquitous. However, challenges remain regarding external light interference and modifications needed for power grid connections and uplinks.
Lifi technology
Li-Fi is a technology that uses light from LED bulbs to transmit data wirelessly. It works by varying the intensity of the light faster than what the human eye can detect. Li-Fi provides wireless connectivity that is much faster than Wi-Fi, with speeds over 1Gbps. It uses visible light within the electromagnetic spectrum instead of radio waves. Li-Fi has advantages over Wi-Fi like increased bandwidth capacity since light spectrum is much larger than radio waves. Potential applications of Li-Fi include use in hazardous environments like hospitals, on aircraft or underwater communications since it avoids issues with radio frequencies in these areas. Future developments could see every light bulb acting as a wireless hotspot to provide connectivity wherever there is light.
Li-FI (NEW)
Li-Fi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission. It is a subset of optical wireless communication that allows for high-speed communication in a manner similar to Wi-Fi. Li-Fi provides higher speeds, greater security, and does not cause any interference with other wireless networks. The document discusses how Li-Fi works using visible light spectrum and LEDs for transmitting and receiving data. It also outlines some advantages like green technology and availability of lighting as hotspots, as well as disadvantages such as line of sight requirement and inability to work in darkness. Potential applications mentioned are underwater communications and location tracking using LEDs.
Li-fi technology presentation
Li-Fi is a technology for wireless communication using light to transmit data and position information. It was invented by Harald Haas at the University of Edinburgh in 2011. Li-Fi uses light-emitting diodes (LEDs) that can be switched on and off at an extremely high speed to transmit data over the visible light spectrum. The LEDs would act as transmitters, while photodetectors act as receivers. Compared to Wi-Fi, Li-Fi has a faster transmission speed of up to 1Gbps, a broader spectrum range, and no interference issues. Potential applications of Li-Fi include use in vehicles, traffic lights, airplanes, underwater, and hospitals due to its availability, efficiency,
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DATA TRANSMISSION USING LIFI TECHNOLOGY
This document proposes an eco-friendly audio data transmission system using visible light communication (VLC) through white LEDs. It consists of a transmitter circuit that encodes audio signals onto the LEDs and a receiver circuit containing a solar panel, amplifier, and speaker to recover and playback the audio signals. The system provides a wireless alternative to existing RF-based systems with benefits of higher bandwidth, data rates, and energy efficiency while avoiding interference, high power consumption, and environmental hazards of RF. It is intended for transmitting audio between devices in a household setting.
DATA TRANSMISSION USING LIFI TECHNOLOGY
The document describes a proposed eco-friendly visible light communication (VLC) system that uses white LED lights to transmit audio signals. In the proposed system, a microcontroller and VLC module in the transmitter encode audio and modulate the white LEDs. At the receiver, a solar panel harvests light from the LEDs and provides power to an amplifier and speaker to recover and playback the original audio signal without other power supplies. The system offers advantages over existing RF-based systems like lower interference, power consumption, and installation costs while being more environmentally friendly.
Lifi technolagy
LIFI is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission. It is a viable alternative to conventional Wi-Fi and has several advantages such as higher speed, more secure connections, and an unregulated spectrum. LIFI can deliver speeds 100 times faster than Wi-Fi and is particularly suited for applications requiring high bandwidth and low latency.
presentation on lifi technology by suraj kumar yadava
Li-Fi technology uses visible light communication (VLC) to transmit data using LED light bulbs. A German physicist named Harald Haas developed this technology, which can transmit data rates faster than 10 megabits per second. Li-Fi works by varying the flickering speed of LED lights to encode data as strings of 1s and 0s. It has advantages over Wi-Fi like better security, low cost, and no interference with other wireless devices. While Li-Fi is a promising new technology, the document did not provide details about its drawbacks over previous technologies or the differences between Li-Fi and other wireless technologies.
Lifi technology
Report on LIFI Technology
Content:-
LIGHT FIDELITY
NEED FOR LI-FI
OVERCOMING WIFI ISSUES
VISIBLE LIGHT COMMUNICATION
LIFE OF LIFI
HOW IT WORKS?
IMPLEMENTATION
LI-FI NETWORKS
APPLICATIONS
ADVANTAGES
LIMITATIONS
CONCLUSION
LIGHT FIDELITY
Light is used instead of radio-waves to transmit information.
Transceiver fitted LED lamps acts like Wi-Fi modems.
LED lamps can light a room as well as transmit-receive information.
Provides illumination as well as data communication.
Light based WI-FI.
Lifi technology
This document discusses Li-Fi technology, which uses visible light communication to transmit data wirelessly. It explains that Li-Fi uses LED bulbs that can be flickered on and off at extremely high speeds to transmit digital signals. The document outlines some of the key components of a Li-Fi system including light bulbs, photo detectors, and data modulation/demodulation components. It also discusses potential applications for Li-Fi in places like hospitals, aircraft, and underwater environments. The advantages are noted as being harmless to humans, more secure than Wi-Fi, and using part of the light spectrum that is more available than radio waves. Disadvantages include light not passing through opaque objects and potential interference from other light sources.
LIFI TECHNOLOGY
Li-Fi is a wireless communication technology that uses visible light communication to transmit data. It was introduced in 2011 by Professor Harald Haas and works by varying the intensity of light from an LED lamp faster than what the human eye can detect. Unlike Wi-Fi, Li-Fi does not penetrate walls so it provides more secure transmission without interference. It has advantages like high speed connectivity, better security since light cannot pass through walls, and helps address issues of limited radio frequency bandwidth. However, it only works with direct line of sight and data can be obstructed by opaque objects between the transmitter and receiver.
Lifi-Light Fidelity
LiFi technology uses visible light communication to transmit data wirelessly. It was coined and commercialized by Professor Dr. Harald Haas. Speed tests have reached 1.6 Gbit/s and transmission rates continue increasing. LiFi will be needed to handle the massive amounts of data from billions of IoT devices expected by 2020. It works by modulating the light from LED bulbs for transmission. Potential applications include medical, aviation, smart lighting and augmented reality. Advantages are availability, efficiency, security and low cost, but disadvantages are needing line of sight and not penetrating walls. More research is still needed but LiFi shows promise for the future of wireless connectivity.
Lifi technology
Li-Fi is a technology that uses light from LED bulbs to transmit data wirelessly. It was pioneered in the 1990s by researchers in Germany, Korea, and Japan who discovered that LEDs could transmit data signals too quickly for the human eye to detect. The technology was further developed by Harald Haas. Li-Fi offers benefits over traditional Wi-Fi like higher speeds, greater security, and an unlimited and unregulated spectrum. It works by varying the intensity of LED light faster than the eye can see to encode digital signals. Potential applications include using streetlights as free wireless access points.
Visible Light Communication
Visible Light Communication (VLC) uses visible light spectrum for data transmission and illumination simultaneously. It has advantages over wireless technologies like free spectrum, high security, and no health hazards. VLC works by modulating the light intensity of LED bulbs to transmit data. Researchers have demonstrated transmitting high definition video through a table lamp. The VLC industry is expected to grow rapidly as LED lighting becomes more widespread. Challenges include increasing data rates and providing bidirectional communication.
VISIBLE LIGHT COMMUNICATION
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
VLC Visible light communication (leaders of li fi)
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.
LiFi 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
visible light communication
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.
Lifi Technology
Ashish Kumar Baghel and Chandraprakash Verma presented on Li-Fi technology at the Oriental Institute of Science and Tech in Bhopal on March 13, 2013. Li-Fi uses visible light communication to transmit data through LED bulbs that can switch on and off faster than the human eye can detect. The technology was pioneered in the 1990s by researchers in Germany, Korea, and Japan. Harald Haas continues advancing Li-Fi which could help address the congestion issues with radio spectrum as data demands double each year. Li-Fi has potential applications in traffic lights, intrinsically safe environments, and as public internet hotspots using street lamps. While still developing, Li-Fi shows promise to enable wireless
LiFi technology
Li-Fi is a technology that uses visible light communication (VLC) to transmit data through illumination by sending data through an LED light bulb that varies in intensity faster than the human eye can detect. It provides higher data transfer rates than existing wireless networks as bandwidth is not fixed. Li-Fi uses visible light between 400-800 THz as the medium for data transmission and works by turning an LED on and off very fast to transmit digital 1s and 0s. While it has advantages over WiFi like higher capacity and security, it also has disadvantages like only working in direct line of sight and not being able to penetrate walls. Potential applications of Li-Fi include education systems, medical uses, cheaper internet on aircraft and more.
Visible light communication
VLC uses visible light communication to transmit data using LED light sources. It has several advantages over traditional RF including unlimited bandwidth potential, no EMI or health hazards, and low power consumption. However, VLC has a much shorter coverage distance than RF. Key applications of VLC include traffic lights that communicate with vehicles, ship-to-ship communication, and indoor lighting that doubles as a communication system.
Visible light communication
This presentation summarizes indoor visible light communication (VLC). VLC uses visible light from LEDs to transmit data, with the LED as the transmitter, air as the medium, and a photodiode as the receiver. It has advantages over radio frequency communication like large bandwidth and no electromagnetic interference. The presentation describes the basic components of VLC like transmitters, modulation techniques, and applications in areas like mobile connectivity and indoor positioning. Challenges in VLC include limited bandwidth and being a line-of-sight technology susceptible to interruptions.
Visible light communication
The document discusses visible light communication (VLC) technology. VLC utilizes visible light sources like LEDs to transmit data through the air to photodiodes. It has a history dating back to the late 1990s and the Visible Light Communication Consortium was established in 2003 to promote standards. The VLC process involves LED or fluorescent light transmitters that can be modulated, and photodiode receivers. VLC offers advantages like high data rates, unlicensed spectrum, and security, but also has limitations like short range and limited transmission power. Potential applications include indoor positioning, retail environments, transportation systems, and wireless networking and audio.
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Similar to LIFI TECHNOLOGY
Li fi
Light Fidelity(Li-Fi) is a bidirectional, high speed and fully networked wireless communication technology similar to Wi-Fi. The term was coined by Harald Haas and 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 giga bits per second. It is wireless and uses visible light communication or infra-red and near ultraviolet (instead of radio frequency waves) spectrum, part of optical wireless communications technology, which carries much more information, and has been proposed as a solution to the RF-bandwidth limitations.
Tech sem sample ppt (1).pptx
This document provides an overview of Li-Fi technology. It begins with an introduction to Li-Fi, which uses LED lighting to transmit data wirelessly. It then explains that Li-Fi works by varying the intensity of an LED light faster than the human eye can detect to transmit bits of data. The document discusses how Li-Fi communication works and compares it to Bluetooth, Wi-Fi. It outlines some key advantages of Li-Fi such as higher data rates and ubiquity of LED lights. Potential applications mentioned include use on airplanes and public internet hotspots using street lamps. The conclusion states that if implemented, every light bulb could function as a Wi-Fi hotspot.
Li fi technology ppt
The document discusses Li-Fi technology, which uses LED light bulbs to transmit data via visible light communication. It explains how Li-Fi works and its real-time usage. Li-Fi provides higher data transmission rates than Wi-Fi and uses the visible light spectrum, which has more available bandwidth. It also offers advantages like privacy, security and low implementation costs compared to Wi-Fi. Some challenges of Li-Fi include its inability to pass through opaque objects and potential interference from other light sources. The document concludes that if widely adopted, Li-Fi could create a cleaner, greener and brighter future with every light bulb acting as an internet hotspot.
Li-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.
Li fi
Li-Fi uses visible light communication through LED bulbs to transmit data at speeds up to 224 gigabits per second. It works by modulating the light intensity of bulbs to transmit data to a photodetector. While faster than Wi-Fi, Li-Fi has limitations in that the light must be on and signals can't pass through walls. However, Li-Fi provides more secure communication and is being tested in cities to provide internet access through street lights. In the future, Li-Fi may be integrated into most light sources to provide connectivity throughout homes and offices.
LiGHT FIDILITY (LIFI)
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.
Wifi Lifi IQRA Peshawar BBA
Li-Fi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission. It is a faster and more secure alternative to Wi-Fi. Li-Fi transmits data through illumination by sending data through an LED light bulb. It can transmit data at speeds up to 224 gigabits per second, much faster than typical Wi-Fi networks. Li-Fi also has advantages over Wi-Fi in that it has better security since light cannot pass through walls and has virtually no interference. While Li-Fi holds promise, it still needs new infrastructure and has limitations in outdoor settings.
lifi technology..pptx
This document provides an overview of Li-fi technology. Li-fi uses light from LED bulbs to transmit data wirelessly, avoiding limitations of Wi-fi such as interference. It works by varying the intensity of light faster than the human eye can detect. While offering advantages like high speeds and security, Li-fi is currently limited by needing light and high installation costs. However, future developments could see every light bulb act as an internet hotspot, providing a cleaner wireless alternative to radio-based networks.
Presentation on li fi by vaishnavi khandelwal
Li-Fi is a wireless optical communication system that uses light-emitting diodes (LEDs) for transmission of data. It was first demonstrated by Professor Harald Hass at the University of Edinburgh in 2011. Li-Fi works by varying the rate at which LEDs flicker on and off, with higher rates representing 1s and lower rates representing 0s to transmit digital data. Key advantages of Li-Fi over Wi-Fi include higher speed, more available bandwidth, and more secure communication through an inability to penetrate walls.
lifi
Li-Fi is a visible light communication system that uses LED light bulbs to transmit data wirelessly. It can transmit data at speeds up to 224 gigabits per second. While faster than Wi-Fi, Li-Fi has a shorter range and requires light bulbs to be on, as the signals cannot pass through walls. Li-Fi may be better suited than Wi-Fi for applications requiring high speeds and better security due to its limited range. Overall, the document compares the capabilities of the emerging Li-Fi technology to traditional Wi-Fi networks.
LiFi Technology powerpoint for bca .pptx
Li-Fi is a wireless communication technology that uses visible light communication to transmit data at high speeds. It works by rapidly modulating LED lights to transmit digital signals. Key advantages are high speeds of up to 10Gbps, providing wireless connectivity without interfering with other devices, and ability to transmit data in areas where Wi-Fi is not allowed or possible. Main challenges are that light cannot pass through objects and developing effective bidirectional communication methods, but Li-Fi has potential to become an important complement or alternative to radio-based wireless networks in the future.
LIGHT FIDELITY TECHNOLOGY (LI FI)
Topics covered:
1. Introduction to LI-FI
2. LI-FI Construction
3. How Li-Fi Works?
4. Advantages
5. Future Scope
6. Conclusion
Introductio to Li-Fi
Li-Fi is a new technology that uses visible light communication and light-emitting diodes (LEDs) to transmit data wirelessly. It is the optical counterpart to Wi-Fi, transmitting data using light rather than radio waves. Li-Fi can provide much higher speeds than Wi-Fi and has advantages such as no interference with other electronic devices, better security since light cannot pass through walls, and an unlimited number of users without affecting speed. However, it requires line of sight between the transmitter and receiver and is limited by obstructions blocking the light. The document discusses how Li-Fi works, compares it to Wi-Fi, reviews its advantages and disadvantages, and potential applications in areas like hospitals.
LI - FI TECHNOLOGY.pptx
Li-Fi is a wireless communication technology that uses light to transmit data between devices. It was introduced in 2011 as an alternative to Wi-Fi that uses light frequencies instead of radio waves. Li-Fi works by transmitting data through light frequencies of LED bulbs that are switched on and off rapidly, which can achieve speeds over 10 Gbps. It has advantages over Wi-Fi like higher speed, bandwidth and security, but does not work in darkness and can be interrupted by obstacles. Future developments of Li-Fi seek to overcome its limitations and provide a more efficient, cheaper and greener alternative to radio-based wireless networks.
Ashish maheshwari
This presentation provides an overview of Li-Fi technology. It discusses how Li-Fi works by transmitting data through illumination by varying the intensity of LED bulbs faster than the human eye can detect. The history and development of Li-Fi is covered, along with its present use as an alternative to Wi-Fi due to issues with radio spectrum capacity and availability. The working process, applications, advantages over Wi-Fi, and challenges of implementing Li-Fi technology are summarized.
Lifi technology(nimesh bariya)
This document discusses LiFi technology, which transmits data through illumination using LED light bulbs. It was invented in 2012 by German physicist Harald Hass. LiFi works by switching LED lights on and off very quickly to transmit digital 1s and 0s. It provides wireless connectivity at speeds up to 1Gbps, faster than WiFi. Potential applications of LiFi include use in traffic lights, airplanes, and underwater communications since it does not interfere with radio frequencies. While it has advantages over WiFi like higher speeds and bandwidth, LiFi also has limitations such as requiring line of sight and being disrupted by external light sources.
Li fi technology
We are all using internet services but we cannot implement anything. Please implement useful network applications and this type of networks. It is not order it is request.
Li fi(light fidelity),npe
Li-Fi is a wireless communication technology that uses light from LED bulbs to transmit data. It works by switching the state of LED bulbs on and off very fast, in a way imperceptible to the human eye. A photodetector converts the flashes of light into electrical signals to decode the transmitted data. Li-Fi could provide higher speeds than Wi-Fi and has applications in areas where radio frequencies are regulated or restricted. However, it requires line of sight between the light source and detector and may not be suitable to replace Wi-Fi for all use cases.
Li fi technology.pptx
This document discusses Li-Fi technology, which transmits data through illumination by varying the intensity of LED lights faster than the human eye can perceive. Li-Fi uses visible light communication through LED bulbs as an alternative to Wi-Fi networks. It has advantages over Wi-Fi such as higher speeds of over 1Gbps, stronger security, and less interference. However, Li-Fi requires line of sight between the light source and receiver and does not work through walls. The document outlines the history, working principle, applications and advantages of Li-Fi technology.
Rejuvenation of wireless technology [li fi]
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.
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LIFI TECHNOLOGY
- 2. OBJECTIVES What is Li fi?? Construction of Li fi??? Working of Li fi!!! Comparison between Wi-Fi and Li-fi How Li-fi is different?? Applications of Li-fi….. Advantages of Li-fi……. Conclusion……
- 3. What is Li-fi???? Li-fi stands for LIGHT FIDELITY Li-fi is transmission of data through illumination sending data through a LED light bulb that varies in intensity faster than the human eye can follow
- 4. Construction of Li-fi?? The Li-fi product consists of 4 primary sub-assemblies: Bulb RF Power Amplifier Circuit(PA) Printed Circuit Board(PCB) Enclosure
- 5. Working of Li-fi!!!! Its working is much simply explained as follows: If the LED is on, the digital “1” is transmitted. And it is off, the digital “0” is transmitted. It is possible to encode data in the light by varying the rate at which the LED’s flicker on and off to give different strings of 1s and 0s
- 6. Comparison between Wi-Fi and Li-fi s.no parameter Li-fi Wi-Fi 1 SPEED >1 GB/s Around 150Mb/s 2 Medium of data transfer Use light as carrier Use radio spectrum 3 Spectrum range Visible light has 10000 times more Having less spectrum than VLC 4 cost Cheaper expensive 5 Network topology Point to point Point to point 6 Operating frequency Hundreds of Tera Hz 2.4 GHz
- 7. How Li-fi is different?? Li-fi technology is based on the LED’s for the transfer of data. The light can belong to any part of the spectrum, irrespective of the regions Also, the speed of the internet is incredibly high and you can download movies, music, games in just few minutes You no more need to be in a region that is Wi-Fi enable to have access to the internet
- 8. Advantages of Li-fi It is possible to achieve more than 10 GB/s Mostly powered by LED’s so it is cost efficient Transmission of data is fast and easy Its main advantage is it’s band with is 10000 times than the radio waves
- 9. Applications of Li-fi Cheaper than Wi-Fi, since visible light spectrum is a visible light spectrum No licence needed Thousands and millions of street lights can be converted in to Li-fi spots
- 10. 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 Wi-Fi hotspots to transmit wireless data