- What is Li-Fi? and Difference between Wifi and Li-fi
- Advantages and disadvantages of Li-Fi.
- Projects related to Li-Fi for Engineering.
Nowadays all of us know about Wifi technology and most of us also know how it works, it works on Radio Frequency (RF).
This article is about Li-fi and the difference between Wifi and Li-fi, so before differentiating them we have some brief details about both of them. Let’s start with Wifi.
What is WiFi?
WiFi, meaning Wireless Fidelity, is the name of the wireless networking technology that uses radio waves to create wireless network connections, provide internet access, or transmit data. It is very popular because it allows users to access networks without the need for a physical wire between the device and the transmitter. When a radio frequency (RF) current is supplied to an antenna, an electromagnetic field is created. The range of Wi-Fi is about 20-50 meters.
Advantages of WiFi
- It is used wirelessly therefore no need o connect to any physical modem through an Ethernet cable.
- We can access the internet through Wi-fi.
- It reduces the cost of cable, therefore it is cheaper than cables cost.
- It can be used anywhere because of wireless transmission.
- Because of Radio Waves, it can be used within the range of 20-50 Meters.
Disadvantages of WiFi
- WiFi connections tend to be insecure.
- The network to be accessed within a 20 to 50 meter radius.
- They are also very expensive to implement.
- Signals tend to be unreliable, because of various interference.
- These interferences can cause a variety of connection problems such as providing weak signals, poor reception, or even loss of connection.
- Wireless connections have speeds ranging from 1 to 54 Mbps whereas wired connections have speeds of 100 Mbps or higher.
What is LiFi?
On the other side of the spectrum, there lies LiFi. LiFi, which means Light Fidelity, is an emerging piece of technology that makes use of Visible Light Communication (VLC) technology instead of radio waves to transmit data. In LiFi, solid-state lighting (SSL) such as LED bulbs are used in the transmission of data and provide access to the internet or a wireless network. This is done by modulating the light given off by the light source (the transmitter) and is received by a photodiode (the receiver). The signals received from the transmitter are then translated into usable data forms that are readily consumed by the end-user. Connections provided by LiFi are typically confined within the space where they are provided due to the nature of visible light.
The Visible Light Spectrum
In contrast to using radio waves, LiFi makes use of visible light. This allows LiFi to have access to a greater range of available frequencies as the visible light spectrum is 10,000 times larger than the entire radio spectrum. The visible light spectrum covers frequencies from 430,000 to 770,000 GHz and colors from near-ultraviolet to near-infrared.
Advantages of LiFi
- One of its biggest benefits comes with its efficiency.
- Users are able to enjoy lower costs in terms of energy consumption.
- They only require working LED lights, which are already available within most households and other establishments, allowing for additional savings in terms of installation costs.
- Light allows LiFi connections to occur almost instantaneously because light travels at extremely fast speeds.
- Faster transmission of data and faster internet connections – about 100 times faster than speeds achievable by WiFi.
- The nature of visible light is that it cannot penetrate opaque walls.
Disadvantages of LiFi
- Its biggest drawback comes in the form of infrastructure (or lack, thereof).
- Plenty of time is still required before the general public can enjoy LiFi technology.
- The light source will need to be constantly turned on in order to provide network access.
- It relies on light to transmit data, it becomes highly susceptible to outside interference.
- Lastly, users are rendered immobile when using LiFi systems due to the limited range of the signal given off by light bulbs. This is, of course, countered by installing multiple LiFi systems within large spaces, creating as many connections as there are light bulbs.
Difference between Wi-Fi and Li-Fi
Following are the important differences between WiFi and LiFi.
|1||Definition||WiFi stands for Wireless Fidelity.||LiFi stands for Light Fidelity.|
|2||Invented||WiFi was invented by NCR corporation in 1991.||LiFi was coined by Prof. Harald Haas in 2011.|
|3||Operation||WiFi transmits data using radio waves using a WiFi router.||LiFi transmits data using light signals using LED bulbs.|
|4||Device Compliance||WLAN 802.11/b/g/n/ac/d standard-compliant devices.||IrDA compliant devices.|
|5||Data Transfer Speed||WiFi transfer speed ranges from 150 Mbps to 2 Gbps.||LiFi transfer speed is about 1 Gbps.|
|6||Frequency||2.4Ghz, 4.9Ghz, and 5Ghz.||10,000 times radio frequency spectrum.|
|7||Coverage||WiFi coverage area is up to 32 meters.||LiFi coverage area is about 10 meters.|
|8||Components||Routers, Modems, and access points.||LED bulb, LED driver, and photodetector.|
|9||Applications||Used in internet browsing using WiFi hotspot.||Used in airlines, undersea explorations.|
When looking at the comparisons between WiFi and LiFi, it would be very difficult to choose one over the other as both have their own merits – and their own disadvantages. That is why a different mindset needs to be adopted and look at these pieces of technology in a different way.
A big misconception about LiFi systems is that it was created to replace WiFi altogether. Considering that most of the existing infrastructure has already been built to accommodate RF technology, it would be very costly and tedious to replace all of that infrastructure to give way to newer technology. For this reason, LiFi needs to be looked at as a complementary technology that aims to improve the performance of the existing technology and provide relief to the already congested radio spectrum used to provide WiFi connections.
Projects of Li-Fi for Engineering Students
There are some of the best projects for Engineering students, you can check them out.
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