Hello Mi Fans,
Welcome back to Tech Class, In the previous tech class you learn about eSIM, in this tech class, you will learn about Li-Fi.
What is Li-Fi?
Li-Fi stands for Light Fidelity and is a Visible Light Communications (VLC) system which runs wireless communications that travel at very high speeds. LiFi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission.
LiFi is designed to use LED light bulbs similar to those currently in use in many energy-conscious homes and offices. However, LiFi bulbs are outfitted with a chip that modulates the light imperceptibly for optical data transmission. LiFi data is transmitted by the LED bulbs and received by photoreceptors.
LiFi's early developmental models were capable of 150 megabits-per-second (Mbps). Some commercial kits enabling that speed have been released. In the lab, with stronger LEDs and different technology, researchers have enabled 10 gigabits-per-second (Gbps), which is faster than 802.11ad.
How does it work?
Li-Fi and Wi-Fi are quite similar as both transmit data electromagnetically. However, Wi-Fi uses radio waves, while Li-Fi runs on visible light waves.
As we now know, Li-Fi is a Visible Light Communications (VLC) system. This means that it accommodates a photo-detector to receive light signals and a signal processing element to convert the data into 'streamable' content.
An LED light bulb is a semiconductor light source meaning that the constant current of electricity supplied to an LED light bulb can be dipped and dimmed, up and down at extremely high speeds, without being visible to the human eye.
For example, data is fed into an LED light bulb (with signal processing technology), it then sends data (embedded in its beam) at rapid speeds to the photo-detector (photodiode).
The tiny changes in the rapid dimming of LED bulbs are then converted by the 'receiver' into an electrical signal.
Li-Fi vs Wi-Fi
While some may think that Li-Fi with its 224 gigabits per second leaves Wi-Fi in the dust, Li-Fi's exclusive use of visible light could halt a mass uptake.
Li-Fi signals cannot pass through walls, so in order to enjoy full connectivity, capable LED bulbs will need to be placed throughout the home. Not to mention, Li-Fi requires the light bulb is on at all times to provide connectivity, meaning that the lights will need to be on during the day.
Additionally, where there is a lack of light bulbs, there is a lack of Li-Fi internet so Li-Fi does take a hit when it comes to public Wi-Fi networks.
However, using Li-Fi instead of Wi-Fi, you'll negate lots of security problems associated with shared and often overloaded broadband networks.
It will also be advantageous in areas where radio frequency waves do not reach.
It was announced in 2016 that an extension of standard Wi-Fi was to be launched called Wi-Fi HaLow.
This new project claims to double the range of connectivity while using less power. Due to this, Wi-Fi HaLow is reportedly perfect for battery-powered devices such as smartwatches and smartphones, and also lends itself to the internet of things devices such as sensors and smart applications.
Due to its impressive speeds, Li-Fi could make a huge impact on the internet of things too, with data transferred at much higher levels with even more devices able to connect to one another.
What's more, due to its shorter range, Li-Fi is more secure than Wi-Fi and it's reported that embedded light beams reflected off a surface could still achieve 70 megabits per second.
Applications of Li-Fi
Li-Fi applications are varied as a result of its key features, such as directional lighting, energy efficiency, intrinsic security, high data rate capability, signal blocking by walls and integrated networking capability.
Following are the applications of Li-Fi:
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.
Advantages and Disadvantages
Following are the advantages of Li-Fi:
Following are the disadvantages of Li-Fi:
More Benefits of Li-Fi
By using LiFi in all the lights in and around a building, the technology could enable greater area of coverage than a single WiFi router. Drawbacks to the technology include the need for a clear line of sight, difficulties with mobility and the requirement that lights stay on for operation.
Source: 1, 2, 3, 4
In Case You Missed Previous Threads:
Chapter 53: All About eSIM
Chapter 52: All About Miracast
Chapter 51: All About Power Banks
Chapter 50: All About USB
Chapter 49: All About Airplane Mode
Chapter 48: All About Wireless Charging
Chapter 47: All About LED TVs
Chapter 46: All about Palm ID
Chapter 45: All About GLONASS
Chapter 44: All About Equalizer
Chapter 43: All About NFC
Chapter 42: All about Mobile Camera - In detail
Chapter 41: All about Mobile Earphones
Chapter 40: Android Source code - What we need to know
Chapter 39: All about Retina Display & Pixel Density
Chapter 38: Mobile Touch panel - An Android Input
Chapter 37: Android Voice Recognition - In Detail
Chapter 36: More about on Internet Protocol (IP)
Chapter 35: All about Factory reset
Chapter 34: All you need to know about ADB
Chapter 33: All About Gi-Fi
Chapter 32: All About Fast Charging
Chapter 31: MIMO Technology Explained
Chapter 30: All about USB Debugging
Chapter 29: All About Smartphone's Heat Up And How To Stop it.
Chapter 28: All About IP (Ingress Protection) Ratings
Chapter 27: All You Need To Know About APN
Chapter 26: All You Need To Know About Virtual Reality (VR)
Chapter 25: All About QR Codes.
Chapter 24: All About Barcodes
Chapter 23: All About Display
Chapter 22: All About Sensors
Chapter 21: All about Speakers
Chapter-20: All About Batteries
Chapter 19: All About Data Cables
Chapter 18: All about Memory Cards
Chapter 17: All About RAM
Chapter 16: All About TWRP
Chapter 15: All about CPU Cores
Chapter 14: All you need to know about Wi-Fi
Chapter 13: All About Kernel
Chapter 12: All About Rooting
Chapter 11: All about Network Bands
Chapter 10: PDAF and its difference with CDAF
Chapter 9: Megapixels and Photo Quality
Chapter 8: CPU Architecture, CPU, GPU
Chapter 7: (IR) Infrared Blaster
Chapter 6: Internet of Things & Mi Home
Chapter 5: All About Activity Tracker & Fitness Band
Chapter 4: All You Need To Know About Charging Cycle
Chapter 3: All You Need To Know About Augmented Reality
Chapter 2: All About Processor and Multi-Core Processing
Chapter 1: Introduction to Smartphone Specifications
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