122 citations · 808 across the 87 of their papers we have counts for
15 papers · 1 filter
Degrees of Freedom of the -User Interference Channel in the Presence of Intelligent Reflecting Surfaces
Ali H. Abdollahi Bafghi, Vahid Jamali, Masoumeh Nasiri-Kenari +1
In this paper, we study the degrees of freedom (DoF) region and sum DoF of the time-selective -user interference channel in the presence of intelligent reflecting surfaces (IRSs…
Joint Beamforming and Phase Shift Optimization for Multicell IRS-aided OFDMA-URLLC Systems
Walid R. Ghanem, Vahid Jamali, Robert Schober
This paper investigates the resource allocation algorithm design for intelligent reflecting surface (IRS) aided multiple-input single-output (MISO) orthogonal frequency division mu…
Resource Allocation for Large IRS-Assisted SWIPT Systems with Non-linear Energy Harvesting Model
Dongfang Xu, Xianghao Yu, Vahid Jamali +2
In this paper, we investigate resource allocation algorithm design for large intelligent reflecting surface (IRS)-assisted simultaneous wireless information and power transfer (SWI…
Channel Modeling for IRS-Assisted FSO Systems
Hedieh Ajam, Marzieh Najafi, Vahid Jamali +1
In this paper, we develop an analytical channel model for intelligent reflecting surface (IRS)-assisted free space optical (FSO) systems. Unlike IRS-assisted radio frequency system…
Optimal Resource Allocation for Multi-user OFDMA-URLLC MEC Systems
Walid R. Ghanem, Vahid Jamali, Robert Schober
In this paper, we study resource allocation algorithm design for multi-user orthogonal frequency division multiple access (OFDMA) ultra-reliable low latency communication (URLLC) i…
Power Efficiency, Overhead, and Complexity Tradeoff in IRS-Assisted Communications -- Quadratic Phase-Shift Design
Vahid Jamali, Marzieh Najafi, Robert Schober +1
In this paper, we focus on large intelligent reflecting surfaces (IRSs) and propose a new codebook construction method to obtain a set of predesigned phase-shift configurations for…
Gridless Multidimensional Angle of Arrival Estimation for Arbitrary 3D Antenna Arrays
Matilde Sánchez-Fernández, Vahid Jamali, Jaime Llorca +1
A full multi--dimensional characterization of the angle of arrival (AoA) has immediate applications to the efficient operation of modern wireless communication systems. In this wor…
Physics-based Modeling of Large Intelligent Reflecting Surfaces for Scalable Optimization
Marzieh Najafi, Vahid Jamali, Robert Schober +1
In this paper, we develop a physics-based model that allows a scalable optimization of large intelligent reflecting surfaces (IRSs). The basic idea is to partition the IRS unit cel…
Joint Uplink-Downlink Resource Allocation for OFDMA-URLLC MEC Systems
Walid R. Ghanem, Vahid Jamali, Qiuyu Zhang +1
In this paper, we study resource allocation algorithm design for multiuser orthogonal frequency division multiple access (OFDMA) ultra-reliable low latency communication (URLLC) in…
Fractionally-Spaced Equalization and Decision Feedback Sequence Detection for Diffusive MC
Trang Ngoc Cao, Vahid Jamali, Nikola Zlatanov +3
In this paper, we consider diffusive molecular communication (MC) systems affected by signal-dependent diffusive noise, inter-symbol interference, and external noise. We design lin…
Physics-based Modeling and Scalable Optimization of Large Intelligent Reflecting Surfaces
Marzieh Najafi, Vahid Jamali, Robert Schober +1
Intelligent reflecting surfaces (IRSs) have the potential to transform wireless communication channels into smart reconfigurable propagation environments. To realize this new parad…
A Single-RF Architecture for Multiuser Massive MIMO via Reflecting Surfaces
Ali Bereyhi, Vahid Jamali, Ralf R. Müller +3
In this work, we propose a new single-RF MIMO architecture which enjoys high scalability and energy-efficiency. The transmitter in this proposal consists of a single RF illuminator…
Resource Allocation for Secure Multi-User Downlink MISO-URLLC Systems
Walid R. Ghanem, Vahid Jamali, Robert Schober
In this paper, we study resource allocation algorithm design for secure multi-user downlink ultra-reliable low latency communication (URLLC). To enhance physical layer security (PL…
Rényi Entropy Bounds on the Active Learning Cost-Performance Tradeoff
Vahid Jamali, Antonia Tulino, Jaime Llorca +1
Semi-supervised classification, one of the most prominent fields in machine learning, studies how to combine the statistical knowledge of the often abundant unlabeled data with the…
Ergodic Sum Rate Analysis of UAV-Based Relay Networks with Mixed RF-FSO Channels
Hedieh Ajam, Marzieh Najafi, Vahid Jamali +1
Unmanned aerial vehicle (UAV)-based communications is a promising new technology that can add a wide range of new capabilities to the current network infrastructure. Given the flex…