VISIBLE LIGHT COMMUNICATION - LIFI
Simple Solutions for Complex Connections.
LiFi is the answer to our digital future
Maybe you’ve heard about LiFi and its revolutionary speeds up to 1000 times faster than WiFi, the current wireless Internet technology standard, but what is LiFi exactly? How can we use it? Will LiFi replace WiFi?
NAV WIRELESS TECHNOLOGIES PVT. LTD. is here to help you understand how LiFi is likely to transform our digital world.
Internet of things (IoT) is progressively affiliated to our day-to-day life. The examples enlarge from smart connected homes to wearable to healthcare . IoT applications not only just boost our comfort but also give us more control to reduce periodic work life and personal tasks Communication is the vital part of every IoT applications. Usually, the wireless communication lay on radio waves. In future, the need for bandwidth in radio spectrum will exhaust. The need for the alternative method is important. LiFi was invented by Dr. Harald Haas and successfully demonstrated at TED in 2011 . Li-Fi is a visible light communication and subsidiary part of optical fiber communication.
Optical fiber communication uses coherent light sources and in LiFi use incoherent light sources . The advent of light emitting diodes produce incoherent light, this can be a Li-Fi transmitter.
There are many pros and cons for this technology. The entire radio spectrum communication can not replace by Li-Fi but there is a certain area that can reduce the use of radio waves such as near field communication, office or home applications, safe environmental conditions such as petrochemical plants etc. This paper proposes a high-speed transmission technique through Li-Fi, which is called triplet Li-Fi. The common scenario uses a visible light source for bearing the data.
Know More About LiFi Technology
What is LiFi ?
LiFi is a wireless optical networking technology. Specifically, it is a form of visible light communications (VLC) system that makes use of light-emitting diodes (LED) for data transmission.
LiFi has a special distinction from other VLC systems. Similar to WiFi, LiFi is the only form of VLC that allows the bidirectional transmission of light. However, instead of the radio spectrum, it makes use of the visible light spectrum through LED lightbulbs outfitted with a special chip.
Visible light can be produced by RGB(red, green, blue) colors, it is meant to say that each spectrum can carry different data. The flickering of light is not visible to human eyes and it remains Li-Fi. Through this methodology, the Li-Fi can improve it’s capability by three times and can improve the physical layer security in communication.
Imagine Every Light Could Connect You To The Internet. We Are Not Only Powering The Innovation And Adoption Of LiFi Technology We Are Enabling Ubiquitous, High-Speed, Secure Data Networks Wherever There Is Illumination.
LiFi uses visible light as a medium for the transmission of data. As a type of VLC system, it requires two components: a photodiode and a light source. The photodiode acts as a transceiver that receives light signals and transmits them back. The light source transmits data using emitted light as the medium. In this case, light emitting diodes (LED) serve as the light source. They are outfitted with a chip that serves as the signal processing unit.
LED light bulbs are semiconductors. This means current supplied to the bulb can be modulated, which in turn, modulates the light they emit. This process occurs at extremely high speeds that are unperceivable to the human eye. Data is fed into the light bulb and sends the data at extremely high speeds to the photodiode. It converts the data received into a binary data stream perceivable by humans such as video and audio applications.
Li-Fi is an added networking physical layer argumentation for current RF methods such as wireless fidelity (Wi-Fi) or long term evolution (LTE). In every Li-Fi source, LED is the bidirectional entry point for the downlink . The uplink should not interpret the downlink, this can be an infrared light source . The greatest fallacy of Li-Fi is a line-ofsight (LOS) link technology . The figure 1 illustrates the perspective of Triplet Li-Fi. Visible light can be reversed into RGB. Each color packed with different data. Perfect ratio of RGB mix is achieved through heed current. Red and green spectrum convey the test sequence and it is generated by an astable multivibrator with 50% duty cycle. Blue spectrum can tote a computer generated binary data, which only permits transistor-transistor logic (TTL). The transmitter includes a simple receiver, a non-filtered photodiode in photovoltaic mode which makes it bidirectional. This operation does not deal with any kind of modulation technique. Greater attainments are feasible with modulation scheme such as orthogonal frequency division multiplexing (ODFM). This is the mild implementation of triplet Li-Fi which extends generously to the reader. The figure 2 illustrates depict of the triplet Li-Fi reception. Blended RGB can be discriminated by the colour filters which can feed to photodiodes. Packed data in blue spectrum must be severalized precisely. Implementation of the trans-impedance amplifier does the translation of photocurrent to the prime voltage level with edge frequency of 1.9Mhz. Preamplifier does the principle voltage for the buffer. Buffer deeds the two services in this case. It compromises the noise generated by capacitance effect in the photodiode and isolates among computer. This implementation does not discuss the
Speed: Perhaps the biggest selling point of LiFi technology is that it is able to transmit data at far greater speeds than WiFi. During lab tests, researchers were able to reach bidirectional transfer speeds of 224 gigabits per second. Of course, it would be difficult to reach those speeds in a real-world setting. But reaching even 1% of that means speeds of 2.24 gigabits per second – a significant improvement over WiFi, which nets transfer speeds of about 20 megabits per second.
Versatility: With the current operational concepts of LiFi, its experimental applications center on the use of LED bulbs and lamps. Hence, it is easily integrated into areas that already use LED lighting systems. The internet is readily-accessible wherever there is light and can be used in a variety of applications that require an internet connection.
Cost: Because LED lamps are inexpensive to produce, analysts predict that the deployment of LiFi would be easier and ten times cheaper than WiFi. Plus, they are more energy-efficient than any other lighting technology. As LiFi systems operate to provide illumination and for internet connectivity, you save up on energy costs.
Availability: As the world looks to use green technology, LED light bulbs are becoming a staple everywhere – in homes, offices, businesses, and even transportation. This means soon enough, high-speed internet connectivity will be as ubiquitous as there are light bulbs.
Security: RF communication technology has always been vulnerable to eavesdropping, signal hijacking, or even brute force attacks. However, visible light is unable to permeate opaque surfaces. Signals emitted by LiFi as well as the data transmitted through it remain confined within the space.
Limitations: LiFi offers a limited range. While this may prove useful for security, it also creates disadvantages. Physical barriers limit its operational scope. In order to increase its scope, lamps or bulbs must be strategically placed in various rooms. In contrast, a single WiFi router has a wider, longer range, making them an ideal selection for public networks.
Interference: LiFi signals are susceptible to light interferences, including sunlight. Receivers may have a difficult time to process signals when other sources of light are present. Moreover, because LED lamps must remain on to function, they can further contribute to light pollution, especially if set at higher brightness levels to compensate for possible interference.
Infrastructure: Theoretically speaking, deploying LiFi systems are inexpensive because they only make use of LED lamps. In reality, the installation of LiFi systems can become expensive due to the lack of infrastructure. Additionally, due to its limited range, several LiFi routers will need to be installed for greater connectivity. This means incurring additional purchase and installation costs. In contrast, a small home will only require a single WiFi router.
LiFi Technology is applicable for
FAQ about LiFi :
LiFi is high speed bidirectional networked and mobile communication of data using light. LiFi comprises of multiple light bulbs that form a wireless network.
When an electrical current is applied to a LED light bulb a stream of light (photons) is emitted from the bulb. LED bulbs are semiconductor devices, which means that the brightness of the light flowing through them can be changed at extremely high speeds. This allows us to send a signal by modulating the light at different rates. The signal can then be received by a detector which interprets the changes in light intensity (the signal) as data.
The intensity modulation cannot be seen by the human eye, and thus communication is just as seamless as other radio systems, allowing the users to be connected where there is LiFi enabled light. Using this technique, data can be transmitted from a LED light
We are currently working towards miniaturisation of LiFi technology. Ultimately the end goal is to have LiFi in every mobile device. This means that the technology will be affordable for integration into handsets, tablets and laptops.
Ultimately the end consumer will see minimal or no cost associated with LiFi as the goal is to have LiFi embedded in every wireless mobile device.
Today companies can speak to LiFi about working with us on proof of concept projects and other types of installations. These installations are priced based on individual requirements.
If all power to a light is turned off then there is no LiFi. However, LiFi technology can be enabled to dim low enough that a room will appear dark and still transmit data. There is consistent performance between 10 and 90 percent illumination.
Currently, LiFi’s technology provide communications at light levels down to 60 lux. For comparison the British standard for minimum light level for reading is 400 lux.
There are also other options for using invisible parts of the light spectrum such as infra-red, which is currently already being used for sending information back to the lightbulb (uplink).
Nav Wireless Technologies Pvt. Ltd. is developing the security components and technologies that enable security specialists to deliver more secure wireless communications.
LiFi is significantly more secure than other wireless technologies because light can be contained in a physical space. Our doors and windows can be shut, and physical barriers and adjustments can be implemented to contain and protect the light. We can create the conditions that allow us to shut the door on our wireless data.
It should be understood that the existing security protocols for encryption and authentication can be leveraged in LiFi systems to provide even more secure wireless systems.
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