14 papers
Deconstructing the Composite Channel for Beyond Diagonal RIS: Channel Estimation and Beamforming Design
Fazal-E Asim, André L. F. de Almeida, Bruno Sokal +2
As beyond-diagonal reconfigurable intelligent surfaces (BD-RISs) gain increasing attention in high-frequency wireless communications, accurate and scalable channel-estimation metho…
Joint Channel and Symbol Estimation for RIS-Assisted Fluid Antenna Systems
Josué V. de Araújo, Daniel C. Alcantara, Gilderlan T. de Araújo +1
This paper addresses joint channel and symbol estimation in reconfigurable intelligent surface (RIS)-aided multiuser uplink systems with fluid antennas (FAs) at the base station. W…
Channel Estimation for Movable Intelligent Surface
Daniel C. Alcantara, Josué V. de Araújo, Gilderlan T. de Araújo +1
This paper proposes a tensor-based channel estimation framework for an uplink MIMO system assisted by a movable intelligent surface. The considered architecture combines a fixed tr…
Dimming Space-Time Code (DSTC) for Visible Light Communication with Semi-Blind Detection
Igor S. C. Rodrigues, Leandro R. Ximenes, André L. F. de Almeida
Visible light communication (VLC) provides a unified framework for wireless data transmission and illumination, but its practical deployment requires transmission schemes that join…
Channel Estimation for Flexible Intelligent Metasurface Aided MIMO Communications
VinÃcius L. Romano, André L. F. de Almeida, Daniel C. Araújo
Flexible Intelligent Metasurfaces (FIMs) enable wireless systems to adapt their three-dimensional geometry through morphing, thereby providing new spatial degrees of freedom. Howev…
Decoupled Delay-Doppler and Angle Estimation in BD-RIS Sensing via Nested Tucker Decomposition
Kenneth BenÃcio, André L. F. de Almeida, Fazal-E-Asim +4
We study single-target localization in a group-connected beyond-diagonal reconfigurable intelligent surface (BD-RIS)-assisted monostatic network with K element groups. We propose a…