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DTSTAMP:20240712T100802Z
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DTSTART;TZID=Europe/Vienna:20240712T100000
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DESCRIPTION:Talk of Dr. Anas Chaaban\, University of British Columbia\, Kel
 owna\, Canada\n\nReconfigurable Intelligent Surfaces (RIS) is envisioned t
 o offer spectral efficiency gains by utilizing a large number of passive r
 eflecting elements that induce phase shifts on the impinging electromagnet
 ic waves to smartly reconfigure the signal propagation environment. This c
 an be particularly relevant bearing in mind the shift towards using higher
  frequencies including the mmWave and THz bands. Many works in the literat
 ure have shown promising gains assuming the availability of perfect channe
 l state information (CSI) at the base station (BS) to optimize its transmi
 ssion and the RIS reflection. This assumption is highly impractical\, and 
 a shift towards less demanding schemes in terms of CSI is needed to improv
 e the feasibility of RIS deployment. In light of this\, we study transmiss
 ion schemes for RIS-assisted systems which have minimal CSI requirement\, 
 and demonstrate that gains can be achieved even in this case. In particula
 r\, we consider transmission schemes that rely on channel statistics only 
 and use random rotations and opportunistic beamforming to enhance performa
 nce while lowering the CSI acquisition requirement. In addition to this\, 
 many works in the literature focus on studying RIS-assisted systems in the
  narrowband. However\, an RIS can have a wideband response\, and such a re
 sponse can be beneficial in some scenarios. We show that an RIS with a wel
 l-designed wideband response can be effective in scenarios where only user
  location is known by leveraging an optimization of the phase-frequency re
 sponse of the RIS. We propose methods for the design of the RIS during its
  fabrication phase as well as methods for its optimization during the oper
 ation phase. As an outlook into future uses of reconfigurable surfaces\, w
 e discuss stacked intelligent metasurfaces and their potential use in futu
 re wireless networks.\n\nCo-sponsored by: Silicon Austria Labs\, Johannes 
 Kepler University Linz\n\nSpeaker(s): Anas Chaaban\n\nRoom: Traunstein mee
 ting forum\, Bldg: Science Park 4\, SAL Linz\, 4th floor\, Johannes Kepler
  University Linz\, Altenbergerstr. 69\, Linz\, Oberosterreich\, Austria\, 
 4040
LOCATION:Room: Traunstein meeting forum\, Bldg: Science Park 4\, SAL Linz\,
  4th floor\, Johannes Kepler University Linz\, Altenbergerstr. 69\, Linz\,
  Oberosterreich\, Austria\, 4040
ORGANIZER:andreas.springer@jku.at
SEQUENCE:18
SUMMARY:Reconfigurable surfaces for wireless communications: Transmission s
 chemes with minimal CSI requirement
URL;VALUE=URI:https://events.vtools.ieee.org/m/425359
X-ALT-DESC:Description: <br /><p>Talk of Dr. Anas Chaaban\, University of B
 ritish Columbia\, Kelowna\, Canada</p>\n<p>Reconfigurable Intelligent Surf
 aces (RIS) is envisioned to offer spectral efficiency gains by utilizing a
  large number of passive reflecting elements that induce phase shifts on t
 he impinging electromagnetic waves to smartly reconfigure the signal propa
 gation environment. This can be particularly relevant bearing in mind the 
 shift towards using higher frequencies including the mmWave and THz bands.
  Many works in the literature have shown promising gains assuming the avai
 lability of perfect channel state information (CSI) at the base station (B
 S) to optimize its transmission and the RIS reflection. This assumption is
  highly impractical\, and a shift towards less demanding schemes in terms 
 of CSI is needed to improve the feasibility of RIS deployment. In light of
  this\, we study transmission schemes for RIS-assisted systems which have 
 minimal CSI requirement\, and demonstrate that gains can be achieved even 
 in this case. In particular\, we consider transmission schemes that rely o
 n channel statistics only and use random rotations and opportunistic beamf
 orming to enhance performance while lowering the CSI acquisition requireme
 nt. In addition to this\, many works in the literature focus on studying R
 IS-assisted systems in the narrowband. However\, an RIS can have a wideban
 d response\, and such a response can be beneficial in some scenarios. We s
 how that an RIS with a well-designed wideband response can be effective in
  scenarios where only user location is known by leveraging an optimization
  of the phase-frequency response of the RIS. We propose methods for the de
 sign of the RIS during its fabrication phase as well as methods for its op
 timization during the operation phase. As an outlook into future uses of r
 econfigurable surfaces\, we discuss stacked intelligent metasurfaces and t
 heir potential use in future wireless networks.</p>
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