28 Jan 2016

LIFI vs WIFI. Which is faster?

Lifi? What is it?

If you’re currently not satisfied with how your Wi-Fi network works, you will be relieved to know that there’s a new innovation now that overpowers normal Wi-Fi speed. Introducing the Li-Fi, a new technology that is 100 times faster than the Wi-Fi.
This new technology offers a speed of up to 224GB per second, which is enough to download 18 movies in just a second. Edinburgh University professor Harald Haas invented the Li-Fi or Light Fidelity using LEDs as the medium for sending data at an incredible speed. Aside from being energy efficient, the Li-Fi is seen as the future of the current Wi-Fi.

The difference between the two services is their ability to manage user traffic that greatly affects their individual speed. The Wi-Fi service uses an unlicensed radio spectrum of 5 GHz while the Li-Fi uses visible light that ranges from 400 to 800 THz.For more information go Here

An increase in the number of Wi-Fi devices will slow down the connection speed, but the Li-Fi will readily fix the jam. If you’re still not convinced with Li-Fi’s capability, the website describes it as a” system that is consisting of an LED transmitter and a solar panel receiver system” and has “speeds of up to 224 gigabits per second.”

The Economic Times mentioned what’s already obvious, and that’s the need for more capacity. The growing number of users and their incredible type of usage have prompted the Wi-Fi service to seek more means of entertaining the growing need for speed. This resulted in overcrowding, which significantly slows down the whole service. The Li-Fi will work at an astounding speed that readily matches the current need of users for capacity and efficiency.

According to the publication, Li-Fi is “essentially an ultra-fast version of turning your flashlight on and off to create a morse code. The flashes occur so fast that they are not seen by the naked eye.”

In its simplest form, a small microchip can be fitted in a potential illumination device and the idea will all be there. It’s about the “illumination and wireless data transmission.” The radio frequency that is currently being used by the Wi-Fi service is so overloaded that it is impossible to improve it more.

How long we have to wait until the Li-Fi is implemented remains to be the question, but the idea of a faster internet is already there and all it needs is some tweaking to make it actually work in volumes.

The following table mentions feature comparison between both:
Full formLight FidelityWireless Fidelity
OperationLiFi transmits data using light with the help of LED bulbs.WiFi transmits data using radio waves with the help of WiFi router.
InterferenceDo not have any interference issues similar to radio frequency waves.Will have interference issues from nearby access points(routers)
TechnologyPresent IrDA compliant devicesWLAN 802.11a/b/g/n/ac/ad standard compliant devices
ApplicationsUsed in airlines, undersea explorations, operation theaters in the hospitals, office and home premises for data transfer and internet browsingUsed for internet browsing with the help of wifi kiosks or wifi hotspots
Merits(advantages)Interference is less, can pass through salty sea water, works in dense regionInterference is more, can not pass through sea water, works in less dense region
PrivacyIn LiFi, light is blocked by the walls and hence will provide more secure data transferIn WiFi, RF signal can not be blocked by the walls and hence need to employ techniques to achieve secure data transfer.
Data transfer speedAbout 1 GbpsWLAN-11n offers 150Mbps, About 1-2 Gbps can be achieved using WiGig/Giga-IR
Frequency of operation10 thousand times frequency spectrum of the radio2.4GHz, 4.9GHz and 5GHz
Data densityWorks in high dense environmentWorks in less dense environment due to interference related issues
Coverage distanceAbout 10 metersAbout 32 meters (WLAN 802.11b/11g), vary based on transmit power and antenna type
System componentsLamp driver, LED bulb(lamp) and photodetector will make up complete LiFi system.requires routers to be installed, subscriber devices (laptops,PDAs,desktops) are referred as stations

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