376 citations · 583 across the 22 of their papers we have counts for
17 papers · 1 filter
Physics-Informed Uncertainty-Aware Beamforming for HAPS Massive MIMO under Imperfect CSI
Akram Y. Sarhan, Osamah A. Abdullah, Khalid T. Musri +1
High-altitude platform station (HAPS) massive multiple-input multiple-output (MIMO) systems are expected to support wide-area, low-latency, and energy-efficient connectivity in fut…
Elevation-Aware Supplementary Uplink for Direct Satellite-to-Device Communications
Rajan Shrestha, Hayder Al-Hraishawi
Direct satellite-to-device (DS2D) communication enables standard mobile devices to connect directly to low Earth orbit (LEO) satellites, providing global coverage without reliance…
Adaptive Pinching Antenna Optimization via Meta-Learning for Physical-Layer Security in Dynamic Wireless Networks
Khalid T. Musri, Akram Y. Sarhan, Osamah A. Abdullah +1
This paper develops a gradient-based meta-learning framework for real-time control of waveguided pinching-antenna systems under user-location uncertainty and physical-layer securit…
In-Lab Carrier Aggregation Testbed for Satellite Communication Systems
Jorge L. Gonzalez-Rios, Eva Lagunas, Hayder Al-Hraishawi +2
Carrier Aggregation (CA) is a technique used in 5G and previous cellular generations to temporarily increase the data rate of a specific user during peak demand periods or to reduc…
Pinching Antenna Systems versus Reconfigurable Intelligent Surfaces in mmWave
Mostafa Samy, Hayder Al-Hraishawi, Madyan Alsenwi +3
Flexible and intelligent antenna designs, such as pinching antenna systems and reconfigurable intelligent surfaces (RIS), have gained extensive research attention due to their pote…
Low-Complexity Channel Estimation Protocol for Non-Diagonal RIS-Assisted Communications
Mostafa Samy, Hayder Al-Hraishawi, Abuzar B. M. Adam +3
Non-diagonal reconfigurable intelligent surfaces (RISs) offer enhanced wireless signal manipulation over conventional RIS by enabling the incident signal on any of its elements…
Beyond Diagonal RIS-Aided Networks: Performance Analysis and Sectorization Tradeoff
Mostafa Samy, Hayder Al-Hraishawi, Abuzar B. M. Adam +3
Reconfigurable intelligent surfaces (RISs) have emerged as a spectrum- and energy-efficient technology to enhance the coverage of wireless communications within the upcoming 6G net…
Artificial Intelligence for Satellite Communication and Non-Terrestrial Networks: A Survey
G. Fontanesi, F. Ortíz, E. Lagunas +18
This paper surveys the application and development of Artificial Intelligence (AI) in Satellite Communication (SatCom) and Non-Terrestrial Networks (NTN). We first present a compre…
An Overview of Channel Models for NGSO Satellites
Victor Monzon Baeza, Eva Lagunas, Hayder Al-Hraishawi +1
Satellite communications industry is currently going through a rapid and profound transformation to adapt to the recent innovations and developments in the realm of non-geostationa…
Joint Beam Hopping and Carrier Aggregation in High Throughput Multi-Beam Satellite Systems
Mirza Golam Kibria, Hayder Al-Hraishawi, Eva Lagunas +2
Beam hopping (BH) and carrier aggregation (CA) are two promising technologies for the next generation satellite communication systems to achieve several orders of magnitude increas…
Improved Gaussian-Bernoulli Restricted Boltzmann Machines for UAV-Ground Communication Systems
Osamah A. Abdullah, Michael C. Batistatos, Hayder Al-Hraishawi
Unmanned aerial vehicle (UAV) is steadily growing as a promising technology for next-generation communication systems due to their appealing features such as wide coverage with hig…
Deep Learning-Based Device-Free Localization in Wireless Sensor Networks
Osamah A. Abdullah, Hayder Al-Hraishawi, Symeon Chatzinotas
Location-based services (LBS) are witnessing a rise in popularity owing to their key features of delivering powerful and personalized digital experiences. The recent developments i…
Multi-layer Space Information Networks: Access Design and Softwarization
Hayder Al-Hraishawi, Mario Minardi, Houcine Chougrani +3
In this paper, we propose an approach for constructing a multi-layer multi-orbit space information network (SIN) to provide high-speed continuous broadband connectivity for space m…
A Survey on Non-Geostationary Satellite Systems: The Communication Perspective
Hayder Al-Hraishawi, Houcine Chougrani, Steven Kisseleff +2
The next phase of satellite technology is being characterized by a new evolution in non-geostationary orbit (NGSO) satellites, which conveys exciting new communication capabilities…
Broadband Non-Geostationary Satellite Communication Systems: Research Challenges and Key Opportunities
Hayder Al-Hraishawi, Symeon Chatzinotas, Björn Ottersten
Besides conventional geostationary (GSO) satellite broadband communication services, non-geostationary (NGSO) satellites are envisioned to support various new communication use cas…
Reconfigurable Intelligent Surfaces for Smart Cities: Research Challenges and Opportunities
Steven Kisseleff, Wallace A. Martins, Hayder Al-Hraishawi +2
The concept of Smart Cities has been introduced as a way to benefit from the digitization of various ecosystems at a city level. To support this concept, future communication netwo…
Traffic Simulator for Multibeam Satellite Communication Systems
Hayder Al-Hraishawi, Eva Lagunas, Symeon Chatzinotas
Assume that a multibeam satellite communication system is designed from scratch to serve a particular area with maximal resource utilization and to satisfactorily accommodate the e…