Technical Bulletin

Bell meets Tesla: Optical wireless communications and power transfer

Published on July 21, 2015

The ‘birth’ of optical wireless communications by Bell “I have heard articulate speech produced by sunlight. I have heard a ray of the sun laugh and cough and sing!” Alexander Graham Bell, February 1879. These were the words of Alexander Graham Bell that expressed his idea of the use of light for communications. The photophone,…


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Highly Sensitive Photon Counting Receivers for Li-Fi Systems

Published on July 3, 2015

Diagram of a SPAD receiver

A New Solution to Long Distance Communication The concept of Li-Fi, first introduced to the general public by Professor Harald Haas, Chair of Mobile Communications at theUniversity of Edinburgh, in a TED Talk in 2011, is currently attracting a great deal of interest and many researches have stepped into the field by proposing new devices…


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SDMA: Creates parallel optical pipes

Published on June 29, 2015

How spatial separation can be used to increase the data rate of Li-Fi Imagine a cocktail party, there are multiple friends and couples who want to talk to each other in a small single room. If they all talk at the same time, the room will be too noisy and no one can hear each…


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Li-Fi Access Nodes Networking Technology – its Inherent Programmable Features

Published on June 24, 2015

Li-Fi communication and networking researchers at the University of Edinburgh are inspired by quantum mechanics to develop systems to control the number of photons in light emitted from a simple off-the-shelf LED light bulb by changing the frequency of the light, making it the most perfect wireless carrier for wirelessly transmitting Internet data in the…


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Li-Fi technology is a true enabler of internet of things and everything

Published on June 3, 2015

Research at the Li-Fi Centre, University of Edinburgh A Li-Fi node is built on strong communication and networking capabilities of optical wireless physical and above TCP/IP layers with a clear vision to connect things and everything anytime, everywhere with very minimal capital expenditure (CAPEX) and operation expenditure (OPEX).  Exploiting (using) genuinely the purpose of the…


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In the future, topology matters the most

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Research at the Li-Fi Centre, University of Edinburgh Consumer market research published worldwide indicates that future networks will be faster but capacity problems could still remain [1]. It further reveals that ‘topology’ – the make-up of transmitters providing the network signal – will be increasingly important for meeting demand in densely-populated areas. We can find…


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Reliable communication and improved networking in a Li-Fi network

Published on May 25, 2015

Research at the Li-Fi Centre, University of Edinburgh Since Li-Fi technology was first introduced to the public by Professor Harald Haas in his 2011 TED Global Talk, it has attracted ever increasing attention from many researchers. Li-Fi is a high-speed, bidirectional and fully networked broadband wireless technology which is aimed at offloading the existing Wi-Fi…


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Li-Fi/Wi-Fi hybrid networks enables the internet everywhere

Published on May 18, 2015

Research at the Li-Fi Centre, University of Edinburgh Due to the wide use of multi-media mobile devices, Wireless Fidelity (Wi-Fi) is getting more and more popular in public. Since 2013, more than 5 billion smart devices use Wi-Fi every day, and this causes a systems overload. This often happens often to people at airports and…


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Is the concept of MIMO suitable for Li-Fi?

Published on May 12, 2015

Research at the Li-Fi Centre, University of Edinburgh Wireless communication has already shaped our daily lives, and multi-media devices such as smart phones and tablet PCs affect the way that we work, entertain and socialise. In addition, in the next couple of years, it is expected that wireless communication will become part of our lives in…


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Robust connection and flexibility in a networked indoor visible light communication (VLC) system

Published on May 8, 2015

Research at the Li-Fi Centre, University of Edinburgh In typical large indoor environment such as a large office or conference room, multiple light emitting diode (LED) lighting fixtures meet the need for lighting. This brings an opportunity of embedding a networked VLC system into an existing lighting network. A potential VLC network system functions as a…


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