118 citations · 357 across the 21 of their papers we have counts for
25 papers
Precoding for Multi-Cell ISAC: from Coordinated Beamforming to Coordinated Multipoint and Bi-Static Sensing
Nithin Babu, Christos Masouros, Constantinos B. Papadias +1
This paper proposes a framework for designing robust precoders for a multi-input single-output (MISO) system that performs integrated sensing and communication (ISAC) across multip…
RSMA for Dual-Polarized Massive MIMO Networks: A SIC-Free Approach
Arthur S. de Sena, Pedro H. J. Nardelli, Daniel B. da Costa +3
Aiming at overcoming practical issues of successive interference cancellation (SIC), this paper proposes a dual-polarized rate-splitting multiple access (RSMA) technique for a down…
Sustainable Wireless Services with UAV Swarms Tailored to Renewable Energy Sources
Igor Donevski, Marco Virgili, Nithin Babu +4
Unmanned Aerial Vehicle (UAV) swarms are often required in off-grid scenarios, such as disaster-struck, war-torn or rural areas, where the UAVs have no access to the power grid and…
Dual-Polarized Massive MIMO-RSMA Networks: Tackling Imperfect SIC
Arthur Sousa de Sena, Pedro H. J. Nardelli, Daniel Benevides da Costa +3
The polarization domain provides an extra degree of freedom (DoF) for improving the performance of multiple-input multiple-output (MIMO) systems. This paper takes advantage of this…
Energy-Efficient Trajectory Design of a Multi-IRS Assisted Portable Access Point
Nithin Babu, Marco Virgili, Mohammad Al-jarrah +6
In this work, we propose a framework for energy-efficient trajectory design of an unmanned aerial vehicle (UAV)-based portable access point (PAP) deployed to serve a set of ground…
Cost-Efficient Deployment of a Reliable Multi-UAV Unmanned Aerial System
Nithin Babu, Petar Popovski, Constantinos B. Papadias
In this work, we study the trade-off between the reliability and the investment cost of an unmanned aerial system (UAS) consisting of a set of unmanned aerial vehicles (UAVs) carry…
Fairness Based Energy-Efficient 3D Path Planning of a Portable Access Point: A Deep Reinforcement Learning Approach
Nithin Babu, Igor Donevski, Alvaro Valcarce +3
In this work, we optimize the 3D trajectory of an unmanned aerial vehicle (UAV)-based portable access point (PAP) that provides wireless services to a set of ground nodes (GNs). Mo…
Optimization of Energy-Constrained IRS-NOMA Using a Complex Circle Manifold Approach
Mahmoud AlaaEldin, Emad Alsusa, Karim G. Seddik +2
This work investigates the performance of intelligent reflective surfaces (IRSs) assisted uplink non-orthogonal multiple access (NOMA) in energy-constrained networks. Specifically,…
Rate-Splitting Multiple Access and its Interplay with Intelligent Reflecting Surfaces
Arthur S. de Sena, Pedro H. J. Nardelli, Daniel B. da Costa +2
Rate-splitting multiple access (RSMA) has recently appeared as a powerful technique for improving the downlink performance of multiple-input multiple-output (MIMO) systems. By flex…
IRS-Assisted Massive MIMO-NOMA Networks with Polarization Diversity
Arthur S. de Sena, Pedro H. J. Nardelli, Daniel B. da Costa +5
In this paper, the appealing features of a dual-polarized intelligent reflecting surface (IRS) are exploited to improve the performance of dual-polarized massive multiple-input mul…
Energy-Efficient 3D Deployment of Aerial Access Points in a UAV Communication System
Nithin Babu, Constantinos B. Papadias, Petar Popovski
In this letter, we propose an energy-efficient 3-dimensional placement of multiple aerial access points (AAPs), in the desired area, acting as flying base stations for uplink commu…
Energy Efficient Altitude Optimization of an Aerial Access Point
Nithin Babu, Konstantinos Ntougias, Constantinos B Papadias +1
In this paper, we propose an energy-efficient optimal altitude for an aerial access point (AAP), which acts as a flying base station to serve a set of ground user equipment (UE). S…
IRS-Assisted Massive MIMO-NOMA Networks: Exploiting Wave Polarization
Arthur S. de Sena, Pedro H. J. Nardelli, Daniel B. da Costa +5
A dual-polarized intelligent reflecting surface (IRS) can contribute to a better multiplexing of interfering wireless users. In this paper, we use this feature to improve the perfo…
What Role Do Intelligent Reflecting Surfaces Play in Multi-Antenna Non-Orthogonal Multiple Access?
Arthur S. de Sena, Dick Carrillo, Fang Fang +6
Massive multiple-input multiple-output (MIMO) and non-orthogonal multiple access (NOMA) are two key techniques for enabling massive connectivity in future wireless networks. A mass…
Objective Multi-variable Classification and Inference of Biological Neuronal Networks
Michael Taynnan Barros, Harun Siljak, Peter Mullen +3
Classification of biological neuron types and networks poses challenges to the full understanding of the brain's organisation and functioning. In this paper, we develop a novel obj…
On CSI-free Multi-Antenna Schemes for Massive RF Wireless Energy Transfer
Onel L. A. López, Samuel Montejo-Sánchez, Richard D. Souza +2
Wireless Energy Transfer (WET) is emerging as a potential green enabler for massive Internet of Things (IoT). Herein, we analyze Channel State Information (CSI)-free multi-antenna…
Maximizing the Mutual Information of Multi-Antenna Links Under an Interfered Receiver Power Constraint
George K. Papageorgiou, Konstantinos Ntougias, Constantinos B. Papadias
Single-user multiple-input / multiple-output (SU-MIMO) communication systems have been successfully used over the years and have provided a significant increase on a wireless link'…
On the Robustness of Coordinated Beamforming to Uncoordinated Interference and CSI Uncertainty
George C. Alexandropoulos, Paul Ferrand, Constantinos B. Papadias
As network deployments become denser, interference arises as a dominant performance degradation factor. To confront with this trend, Long Term Evolution (LTE) incorporated features…
Advanced Coordinated Beamforming for the Downlink of Future LTE Cellular Networks
George C. Alexandropoulos, Paul Ferrand, Jean-Marie Gorce +1
Modern cellular networks in traditional frequency bands are notoriously interference-limited especially in urban areas, where base stations are deployed in close proximity to one a…
Reducing Complexity in Next-Generation MU-MIMO Systems
Konstantinos Ntougias, Dimitrios Ntaikos, Constantinos B. Papadias
Recently, several advanced multi-antenna radio communications technologies have emerged to meet the increased capacity demands in wireless multi-user networks. Despite their great…
Precoding for Multiuser MIMO Systems with Single-Fed Parasitic Antenna Arrays
George C. Alexandropoulos, Vlasis I. Barousis, Constantinos B. Papadias
Transmitter (TX) cooperation at various levels has been shown to increase the sum throughput of multiuser multiple-input multiple-output (MIMO) systems. In this paper we consider a…
Massive Antenna Arrays with Low Front-End Hardware Complexity: An Enabling Technology for the Emerging Small Cell and Distributed Network Architectures
Vlasis I. Barousis, Mohammad A. Sedaghat, Ralf R. Müller +1
This paper presents the current state-of-the-art of massive antenna array architectures with significant front-end hardware savings, as an enabler for future small and powerful cel…
A Reconfigurable Distributed Algorithm for K-user MIMO Interference Networks
George C. Alexandropoulos, Constantinos B. Papadias
It is already well-known that interference alignment (IA) achieves the sum capacity of the K-user interference channel at the high interference regime. On the other hand, it is int…
Interference Alignment: A one-sided approach
Hadi G. Ghauch, Constantinos B. Papadias
Interference Alignment (IA) is the process of designing signals in such a way that they cast overlapping shadows at their unintended receivers, while remaining distinguishable at t…