Research Team - Digital Telecommunications Systems and Networks Laboratory - ECE Department AUTH

The Wireless Communications Systems Group (WCSG) belongs to the Digital Telecommunications Systems and Networks Laboratory of the Electrical and Computer Engineering Department of Aristotle University of Thessaloniki, Greece. It was established in 2004 by Prof. George K. Karagiannidis. Prof. George K. Karagiannidis is a Fellow of IEEE and he has been recognized by Clarivate Analytics (former Thomson Reuters) as one of the “Highly Cited Researchers and Most Influential Scientific Minds” for the years 2015, 2016, 2017, and 2018.

The WCSG currently consists of one (1) Professor, one (1) postdoctoral researcher and four (4) PhD students. It is a dynamic and particularly active research group that has published hundreds of scientific and technical papers. WCSG conducts fundamental and applied research in the broader fields of telecommunications systems and signal processing, both independently and by means of more than 30 international collaborations. In particular, the research interests and experience of the group spans a variety of research areas: 1. Wireless Communications 2. Wireless Power Transfer and Applications 3. Optical Wireless Communications 4. Communications and Signal Processing for Biomedical Engineering 5. Wireless Security

The subject of his speech...

Lighting up the data rate: On the integration of lightwave technology in wireless networks

In recent years, the needs of the next generation (5G and beyond) networks are pushing us to look for solutions at higher frequencies, such as millimeters (mmWave). The idea of ​​exploiting the optical spectrum for communications has existed for decades, but its most widespread use is in fiber optic communications. Recently, free space optics (FSO), optical communications in unguided media such as air, has attracted the interest of the scientific community. So, the idea of ​​the LiFi (Light Fidelity), visual equivalent of the well-known WiFi, was created. LED lamps, which have already been designed for use with fiber optics, have been established as a solution for illuminating spaces and are now also being studied for transferring information as well. The basic idea is that the intensity of light can fluctuate, thus containing the information at a rate faster than the human eye can perceive. Visible light communication (VLC), which is the term used for this research area, offers ample available spectrum in the scale of hundreds of THz and has the very important property of not interfering with conventional RF communications. The latter feature is very fundamental for future generation networks, which are limited by interference. Also, VLC can achieve higher data speeds for users as well as increased physical layer security, as light does not penetrate through walls.

In this tutorial, we will introduce the concept of VLC and we will take a look at the possible applications, as well as the state of the art.