213 citations · 258 across the 16 of their papers we have counts for
6 papers · 1 filter
Near-Field Multipath MIMO Channel Model for Imperfect Surface Reflection
Mohamadreza Delbari, George C. Alexandropoulos, Robert Schober +2
Near-field (NF) communications is receiving renewed attention in the context of passive reconfigurable intelligent surfaces (RISs) due to their potentially extremely large dimensio…
Delay Dispersion in IRS-assisted FSO Links
Hedieh Ajam, Vahid Jamali, Bernhard Schmauss +1
The line-of-sight (LOS) requirement of free-space optical (FSO) systems can be relaxed by employing optical intelligent reflecting surfaces (IRSs). In this paper, we model the impa…
User Tracking and Direction Estimation Codebook Design for IRS-Assisted mmWave Communication
Moritz Garkisch, Sebastian Lotter, Gui Zhou +2
Future communication systems are envisioned to employ intelligent reflecting surfaces (IRSs) and the millimeter wave (mmWave) frequency band to provide reliable high-rate services.…
The Road to Next-Generation Multiple Access: A 50-Year Tutorial Review
Yuanwei Liu, Chongjun Ouyang, Zhiguo Ding +1
The evolution of wireless communications has been significantly influenced by remarkable advancements in multiple access (MA) technologies over the past five decades, shaping the l…
Performance Tradeoff Between Overhead and Achievable SNR in RIS Beam Training
Friedemann Laue, Vahid Jamali, Robert Schober
Efficient beam training is the key challenge in the codebook-based configuration of reconfigurable intelligent surfaces (RISs) because the beam training overhead can have a strong…
Far- versus Near-Field RIS Modeling and Beam Design
Mohamadreza Delbari, George C. Alexandropoulos, Robert Schober +1
In this chapter, we investigate the mathematical foundation of the modeling and design of reconfigurable intelligent surfaces (RIS) in both the far- and near-field regimes. More sp…