Wave-Controlled Metasurface-Based Reconfigurable Intelligent Surfaces

#6G, #Reconfigurable #Intelligent #Surfaces

Reconfigurable Intelligent Surfaces (RISs) are programmable
metasurfaces that can adaptively steer received electromagnetic energy
in desired directions by employing controllable phase shifting
cells. Among other uses, an RIS can modify the propagation environment
in order to provide wireless access to user locations that are not
otherwise reachable by a base station. Alternatively, an RIS can steer
the waves away from particular locations in space, to eliminate
interference and allow for co-existence of the wireless network with
other types of fixed wireless services (e.g., radars, unlicensed radio
bands, etc.). The novel approach presented in this talk is a
wave-controlled architecture that properly accounts for the maximum
possible change in the local reflection phase that can be achieved by
adjacent RIS elements. It obviates the need for dense wiring and
signal paths that would be required for individual control of every
RIS element, and thus offers a substantial reduction in the required
hardware. We specify this wave-controlled RIS architecture in detail
and discuss signal processing and machine learning methods that
exploit it in both point-to-point and multi-cell MIMO systems. Such
implementations can lead to a dramatic improvement in next-generation
wireless, radar, and navigation systems where RIS finds wide
applications. They have the potential to improve the efficiency of
spectrum utilization and coexistence by orders of magnitude.

  Date and Time




  • Date: 18 Jan 2023
  • Time: 04:00 PM to 05:00 PM
  • All times are (UTC+02:00) Helsinki
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  • Co-sponsored by University of Oulu, Centre for Wireless Communications


Ender Ayanoglu


Ender Ayanoglu received the Ph.D. degree from Stanford University,
Stanford, CA in 1986, in electrical engineering. He was with the
Communications Systems Research Laboratory, part of AT&T Bell
Laboratories, Holmdel, NJ until 1996, and Bell Labs, Lucent
Technologies until 1999. From 1999 until 2002, he was a Systems
Architect at Cisco Systems, Inc., San Jose, CA. Since 2002, he has
been a Professor in the Department of Electrical Engineering and
Computer Science, University of California, Irvine, Irvine, CA, where
he served as the Director of the Center for Pervasive Communications
and Computing and held the Conexant-Broadcom Endowed Chair during
2002-2010. His past accomplishments include invention of the 56K
modems, characterization of wavelength conversion gain in Wavelength
Division Multiplexed (WDM) systems, and diversity coding, a technique
for link failure recovery in communication networks employing erasure
coding introduced in 1990, prior to the publication of the first
papers on network coding. During 2000-2001, he served as the founding
chair of the IEEE-ISTO Broadband Wireless Internet Forum (BWIF), an
industry standards organization which developed and built a broadband
wireless system employing Orthogonal Frequency Division Multiplexing
(OFDM) and a Medium Access Control (MAC) algorithm that provides
Quality-of-Service (QoS) guarantees. This system is the precursor of
today’s Fourth and Fifth Generation (4G and 5G) cellular wireless
systems. From 1993 until 2014, Dr. Ayanoglu was an Editor, and since
January 2014 is a Senior Editor of the IEEE Transactions on
Communications. He served as the Editor-in-Chief of the IEEE
Transactions on Communications from 2004 to 2008. From January 2015
until December 2016 he served as the Editor-in-Chief of the IEEE
Journal on Selected Areas in Communications - Series on Green
Communications and Networking. This series published three special
issues with record number of papers. He led the efforts to start the
IEEE Transactions on Green Communications and Networking and served as
its Founding Editor-in-Chief from August 2016 to August 2020. From
1990 to 2002, he served on the Executive Committee of the IEEE
Communications Society Communication Theory Committee, and from 1999
to 2002, was its Chair. Dr. Ayanoglu is the recipient of the IEEE
Communications Society Stephen O. Rice Prize Paper Award in 1995, the
IEEE Communications Society Best Tutorial Paper Award in 1997, and the
IEEE Communications Society Communication Theory Technical Committee
Outstanding Service Award in 2014. He has been an IEEE Fellow since
1998. He is an IEEE Communications Society Distinguished Lecturer in
2002 and 2023.