Conventional energy-constrained wireless systems such as sensor networks are powered by batteries and have a limited lifetime. Wireless power transfer (WPT) is a promising technology for energy-sustainable networks, where terminals can harvest energy from dedicated electromagnetic radiation through appropriate electronic circuits. The integration of WPT technology into communication networks introduces a fundamental co-existence of information and energy flows; radio-frequency signals are used in order to convey information and/or energy. The efficient management of these two flows through sophisticated networking protocols, signal processing/communication techniques, and network architectures, gives rise to a new communication paradigm called wireless-powered communications (WPC). In this talk, we discuss the principles of WPC and we highlight its main network architectures as well as the fundamental trade-off between information and energy transfer. By following a bottom-up cross-layer approach, several examples, that deal with the fundamentals of WPC as well as its integration in modern communication systems, are presented. Specifically, we deal with circuit models for WPT, information-theoretic limits, signal processing aspects, and waveform design, system-level analysis by using stochastic geometry tools. Future research directions and challenges are also pointed out.
Ioannis Krikidis received a diploma in Computer Engineering from the Computer Engineering and Informatics Department (CEID) of the University of Patras, Greece, in 2000, and the M.Sc and Ph.D. degrees from Ecole Nationale Superieure des Telecommunications (ENST), Paris, France, in 2001 and 2005, respectively, all in electrical engineering. From 2006 to 2007 he worked, as a Post-Doctoral researcher, with ENST, Paris, France, and from 2007 to 2010 he was a Research Fellow in the School of Engineering and Electronics at the University of Edinburgh, Edinburgh, UK. He is currently an Associate Professor at the Department of Electrical and Computer Engineering, University of Cyprus, Nicosia, Cyprus. His current research interests include wireless communications, cooperative networks, 6G communication systems, wireless-powered communications, and intelligent reflecting surfaces. Dr. Krikidis serves as an Associate Editor for IEEE Transactions on Wireless Communications and Senior Editor for IEEE Wireless Communications Letters. He is also the Founding Specialty Chief Editor for Communication Theory in Frontiers Communications and Networks. He was the recipient of the Young Researcher Award from the Research Promotion Foundation, Cyprus, in 2013, the recipient of the IEEEComSoc Best Young Professional Award in Academia, in 2016, and the IEEE Signal Processing Letters Best Paper Award in 2019. He has been recognized by the Web of Science as a Highly Cited Researcher for 2017-2021. He is an IEEE Fellow (class 2019) and he has received the prestigious ERC consolidator grant.