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What is Light Fidelity (LiFi)? – A Guest Post from Grandmetric Advisor



21.11.2017

LiFi Architecture

Light Fidelity (LiFi) was introduced by Prof. Harald Haas, from the University of Edinburgh in the UK, in his 2011 TED Global Talk titled “Wireless Data from Every Light Bulb”. It is a new broadband wireless communication technology similar to WiFi, but it uses visible light communication (VLC) instead of radio frequency used by WiFi. LiFi can transmit data at incredible speeds in the range of 200 Gbps in laboratory conditions using direct Line of Sight (LOS).

LiFi uses Light-Emitting Diodes (LEDs) bulbs, which flicker on and off at a very high rate not noticeable to the human eye, as a medium to deliver high speed communication. Because LiFi uses light, it cannot penetrate walls and has limited working distance of typically a few meters.

The lack of penetration capability through walls can be disadvantage for some users, but at the same time it is indeed advantageous from security point of view (i.e., LiFi is more secure from hacking, relative to WiFi, because communications cannot be intercepted by anyone in another room).

More details about advantages, drawbacks, potential applications, and commercial product of LiFi are in the PPT presentation.

LiFiTechnology_PPT

 

References:

[1]M. Afgani, H. Haas, H. Elgala, and D. Knipp, “Visible Light Communication using OFDM,” in Proc. of the 2nd International Conference on Testbeds and Research Infrastructures for the Development of Networks and Communities (TRIDENTCOM),  pp. 129-134, March 1-3, 2006

[2]https://purelifi.com/

[3]https://www.t-systems.com/en/perspectives/networks/light-fidelity/li-fi-661390

[4]http://www.archlighting.com/technology/li-fi-high-speed-communication-via-led-modulation_o

[5] http://www.rfwireless-world.com/Terminology/LiFi-internet-vs-WiFi-internet.html

[6] http://www.rfwireless-world.com/Terminology/Advantages-and-Disadvantages-of-LiFi.html

[7] https://techinfographics.com/wifi-vs-lifi-technology-hidden-advantages-will-change-your-perception/

Author

Youssouf Ould Cheikh Mouhamedou

Dr. Youssouf Ould Cheikh Mouhamedou is a Senior Wireless Access Expert. He has 15+ years of international experience in both the academic and telecom sectors in North America (Canada), Europe (Germany and France), and MENA Region (Saudi Arabia) relating to wireless telecommunications, software development, and project management. His interests are in wireless technology innovations and trends, strategy and roadmap, interfacing with vendors, project execution and monitoring, and technical alliances and partnerships. He received Dipl.-Ing. and Ph.D. degrees in electrical and computer engineering from Munich University of Technology (TUM), Germany, and McGill University, Canada, respectively.

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