[CPCC] Seminar by Prof. Constantinos Papadias

Hamid Jafarkhani hamidj at uci.edu
Thu Oct 6 13:46:35 PDT 2016


Title: Low complexity antenna arrays and techniques for wireless 
communication and sensing

Speaker: Prof. Constantinos Papadias

Date: Oct. 7, 2016, Fri

Time: 9:15 AM

Venue: McDonnell Douglas Engineering Auditorium (MDEA)


ABSTRACT

In this talk we will provide an overview of recently developed 
techniques in the area of compact antenna arrays that have fewer radio 
frequency (RF) chains than elements. These arrays comprise of both 
conventionally fed active antennas and passive ones that radiate due to 
the mutual coupling from neighboring elements. By using load control 
circuits, the mutual coupling between adjacent elements can be exploited 
in order to produce the desired radiation patterns. Compared to 
conventional antenna arrays, which require one RF chain per element, 
these systems have a clear double benefit: they require fewer RF chains, 
making them cheaper and less power-consuming;  and they occupy a smaller 
volume, due to the small inter-element distances needed for strong 
mutual coupling.  However, it is not always straightforward to design 
the mixed analog-digital circuit logic that can produce arbitrary (e.g. 
channel-dependent) beams or other types of spatial multiplexing and 
precoding. A number of recent advances in this direction will be 
provided, including techniques for closed-loop MIMO transmission, as 
well as multi-user precoding. The corresponding applications range from 
MIMO handsets to small cell access points and remote radio heads to 
Massive arrays. The use of such low-complexity arrays in cognitive radio 
networks and other spectrum sharing systems is another important 
application that will be emphasized.  The talk will conclude with the 
presentation of a number of recent over-the-air experiments and demos 
performed at AIT's  Broadband Wireless & Sensor Networks (B-WiSE) 
Research Lab that showcase the benefits of these systems in various 
  setups, which underline their potential for next-generation wireless 
devices and networks.

SPEAKER'S BIOGRAPHY

ConstantinosB. Papadiasis the Dean of Athens Information Technology 
(AIT), in Athens, Greece, where he is also Professor and Head of its 
Broadband Wireless and Sensor Networks (B-WiSE) Research Group. He is 
also Adjunct Professor at Aalborg University in Denmark. He received the 
Diploma of Electrical Engineering from the National Technical University 
of Athens (NTUA) in 1991 and the Doctorate degree in Signal Processing 
(highest honors) from the EcoleNationaleSupérieuredes 
Télécommunications(ENST), Paris, France, in 1995. He was a researcher at 
InstitutEurécom(1992-1995), Stanford University (1995-1997) and Bell 
Labs (as Member of Technical Staff from 1997-2001 and as Technical 
Manager from 2001-2006). He was also Adjunct Professor at Columbia 
University (2004-2005) and Carnegie Mellon University (2006-2011). His 
research interests span several areas of advanced communication systems, 
with emphasis on wireless, cognitive, green and next generation 
networks. He has published over 170 papers, one research monograph, two 
edited books, 6 book chapters, and has received over 6000 citations for 
his work. He has also made standards contributions and holds 12 patents. 
He was a member of the Steering Board of the Wireless World Research 
Forum (WWRF) from 2002-2006, a member and industrial liaison of the 
IEEE's Signal Processing for Communications Technical Committee from 
2003-2008 and a National Representative of Greece to the European 
Research Council's IDEAS program from 2007-2008. He has served as member 
of the IEEE Communications Society's Fellow Evaluation and Awards 
Comities, as well as an Associate Editor for the IEEE Transactions on 
Signal Processing, the IEEE Transactions on Wireless Communications and 
the Journal of Communications and Networks. He has participated in 
several European Commission research grants, including the Horizon2020 
project SANSA in the area of satellite-assisted wireless backhauling and 
another two FP7 research projects where he acts as Technical 
Coordinator: HARP, in the area of remote radio heads, and ADEL, in the 
area of licensed shared access. His distinctions include the Bell Labs 
President's Award (2002); a Bell Labs Teamwork Award (2003); the IEEE 
Signal Processing Society's Young Author Best Paper Award (2003); ESI's 
"most cited paper of the decade" citation in the area of wireless 
networks (2006); his recognition as a "Highly Cited Greek Scientist" 
(2011); and the co-authorship of two papers that earned Best Student 
Paper Awards at the IEEE International Conference on Bioinformatics and 
BioEngineering(2013 & 2014). He was a Distinguished Lecturer of the IEEE 
Communications Society for 2012-2013. Dr. Papadiasis a Member of the 
Technical Chamber of Greece and a Fellow of IEEE.



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