9 citations · 26 across the 15 of their papers we have counts for
16 papers
Dynamic-Aware LC-DMA Beam Tracking for LEO Satellite Communications
Mohamadreza Delbari, Mohammad Zarei, Denis Giniatoulline +1
Liquid crystal (LC)-based dynamic metasurface antennas (DMAs) offer a power-efficient, low-cost, and scalable solution for low Earth orbit (LEO) satellite communications where larg…
Temperature-aware Optimization of Liquid Crystal Reconfigurable Intelligent Surfaces: Physics-based Modeling and Robust Design
Mohamadreza Delbari, Bowu Wang, Arash Asadi +1
While LC technology facilitates the realization of energy-efficient and scalable RISs, their phase shift response is inherently temperature-dependent. Neglecting this thermal depen…
Fault-Aware Design for Reconfigurable Holographic Surface-Aided ISAC Systems
Lu Wang, Mohamadreza Delbari, Gui Zhou +3
Reconfigurable holographic surface (RHS)-aided integrated sensing and communication (ISAC) systems hold great promise for achieving both sensing and communication with low hardware…
Wideband Illumination with Liquid Crystal Reconfigurable Intelligent Surfaces: Modeling, Design, and Experimental Tests
Mohamadreza Delbari, Robin Neuder, Alejandro Jiménez-Sáez +2
Liquid crystal (LC) is a promising hardware solution for implementing large RISs, as it is cost-effective, energy efficient, scalable, and capable of providing continuous phase shi…
Flexible RISs: Learning-based Array Manifold Estimation and Phase-shift Optimization
Mohamadreza Delbari, Ehsan Mohammadi, Mostafa Darabi +3
Reconfigurable intelligent surfaces (RISs) are envisioned as a key enabler for next-generation wireless networks, offering programmable control over propagation environments. While…
Learning-Based Phase Shift Optimization of Liquid Crystal RIS in Dynamic mmWave Networks
Le Hao, Robin Neuder, Mohamadreza Delbari +4
To enhance coverage and signal quality in millimeter-wave (mmWave) frequencies, reconfigurable intelligent surfaces (RISs) have emerged as a game-changing solution to manipulate th…
Near-Field Multipath MIMO Channels: Modeling Reflectors and Exploiting NLOS Paths
Mohamadreza Delbari, George C. Alexandropoulos, Robert Schober +2
Near-field (NF) communications is receiving renewed interest in the context of multiple-input multiple-output (MIMO) systems involving large physical apertures with respect to the…
Liquid Crystal-Based RIS Loss-Trade-Off Analysis
Bowu Wang, Mohamadreza Delbari, Robin Neuder +2
Liquid crystal (LC) technology has emerged as a promising solution for large reconfigurable intelligent surfaces (RISs) at millimeter wave (mmWave) bands, offering advantages such…
Near-field Liquid Crystal RIS Phase-Shift Design for Secure Wideband Illumination
Mohamadreza Delbari, Qikai Zhou, Robin Neuder +2
Liquid crystal (LC) technology provides a low-power and scalable approach to implement a reconfigurable intelligent surface (RIS). However, the LC-based RIS's phase-shift response…
Temperature-Resilient LC-RIS Phase-Shift Design for Multi-user Downlink Communications
Nairy Moghadas Gholian, Mohamadreza Delbari, Vahid Jamali +1
The reflecting antenna elements in most reconfigurable intelligent surfaces (RISs) use semiconductor-based (e.g., positive-intrinsic-negative (PIN) diodes and varactors) phase shif…
Fast Reconfiguration of Liquid Crystal-RISs: Modeling and Algorithm Design
Mohamadreza Delbari, Robin Neuder, Alejandro Jiménez-Sáez +2
LC technology is a promising hardware solution for realizing extremely large RISs due to its advantages in cost-effectiveness, scalability, energy efficiency, and continuous phase…
Temperature-Aware Phase-shift Design of LC-RIS for Secure Communication
Mohamadreza Delbari, Bowu Wang, Nairy Moghadas Gholian +2
Liquid crystal (LC) technology enables low-power and cost-effective solutions for implementing the reconfigurable intelligent surface (RIS). However, the phase-shift response of LC…
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…
Fast Transition-Aware Reconfiguration of Liquid Crystal-based RISs
Mohamadreza Delbari, Robin Neuder, Alejandro Jiménez-Sáez +2
Liquid crystal (LC) technology offers a cost-effective, scalable, energy-efficient, and continuous phase tunable realization of extremely large reconfigurable intelligent surfaces…
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…
Reconfigurable Intelligent Surfaces with Liquid Crystal Technology: A Hardware Design and Communication Perspective
Alejandro Jiménez-Sáez, Arash Asadi, Robin Neuder +2
With the surge of theoretical work investigating Reconfigurable Intelligent Surfaces (RISs) for wireless communication and sensing, there exists an urgent need of hardware solution…