376 citations · 528 across the 84 of their papers we have counts for
20 papers · 1 filter
Integrated Access and Backhaul via LEO Satellites with Inter-Satellite Links
Zaid Abdullah, Eva Lagunas, Steven Kisseleff +2
The third generation partnership project (3GPP) has recently defined two frequency bands for direct access with satellites, which is a concrete step toward realizing the anticipate…
Genetic Algorithm-based Beamforming in Subarray Architectures for GEO Satellites
Juan Andrés Vásquez-Peralvo, Jorge Querol, Eva Lagunas +5
The incorporation of subarrays in Direct Radiating Arrays for satellite missions is fundamental in reducing the number of Radio Frequency chains, which correspondingly diminishes c…
Supervised Learning Based Real-Time Adaptive Beamforming On-board Multibeam Satellites
Flor Ortiz, Juan A. Vasquez-Peralvo, Jorge Querol +6
Satellite communications (SatCom) are crucial for global connectivity, especially in the era of emerging technologies like 6G and narrowing the digital divide. Traditional SatCom s…
Reconfigurable Intelligent Surfaces for 6G Non-Terrestrial Networks: Assisting Connectivity from the Sky
Wali Ullah Khan, Asad Mahmood, Chandan Kumar Sheemar +3
This paper studies the potential of RIS-integrated NTNs to revolutionize the next-generation connectivity. First, it discusses the fundamentals of RIS technology. Secondly, it delv…
Flexible Payload Configuration for Satellites using Machine Learning
Marcele O. K. Mendonca, Flor G. Ortiz-Gomez, Jorge Querol +5
Satellite communications, essential for modern connectivity, extend access to maritime, aeronautical, and remote areas where terrestrial networks are unfeasible. Current GEO system…
Gateway Station Geographical Planning for Emerging Non-Geostationary Satellites Constellations
Victor Monzon Baeza, Flor Ortiz, Eva Lagunas +2
Among the recent advances and innovations in satellite communications, Non-Geostationary Orbit (NGSO) satellite constellations are gaining popularity as a viable option for providi…
Harnessing Supervised Learning for Adaptive Beamforming in Multibeam Satellite Systems
Flor Ortiz, Juan A. Vasquez-Peralvo, Jorge Querol +5
In today's ever-connected world, the demand for fast and widespread connectivity is insatiable, making multibeam satellite systems an indispensable pillar of modern telecommunicati…
Deep Reinforcement Learning for Backscatter Communications: Augmenting Intelligence in Future Internet of Things
Wali Ullah Khan, Eva Lagunas, Zain Ali +5
Backscatter communication (BC) technology offers sustainable solutions for next-generation Internet-of-Things (IoT) networks, where devices can transmit data by reflecting and adju…
Energy-Efficient On-Board Radio Resource Management for Satellite Communications via Neuromorphic Computing
Flor Ortiz, Nicolas Skatchkovsky, Eva Lagunas +6
The latest satellite communication (SatCom) missions are characterized by a fully reconfigurable on-board software-defined payload, capable of adapting radio resources to the tempo…
Full Duplex Joint Communications and Sensing for 6G: Opportunities and Challenges
Chandan Kumar Sheemar, Sourabh Solanki, George C. Alexandropoulos +4
The paradigm of joint communications and sensing (JCAS) envisions a revolutionary integration of communication and radar functionalities within a unified hardware platform. This no…
Reconfigurable Intelligent Surfaces Enhanced NOMA D2D Communications Underlaying UAV Networks
Wali Ullah Khan, Eva Lagunas, Asad Mahmood +3
Device-to-device (D2D) communications offers high spectral efficiency, low energy consumption and transmission latency. However, one of the main limitations of D2D communications i…
RIS-Assisted Energy-Efficient LEO Satellite Communications with NOMA
Wali Ullah Khan, Eva Lagunas, Asad Mahmood +2
This paper proposes an energy-efficient RIS-assisted downlink NOMA communication for LEO satellite networks. The proposed framework simultaneously optimizes the transmit power of g…
Energy Efficient RAN Slicing and Beams Selection for Multiplexing of Heterogeneous Services in 5G mmWave Networks
PraveenKumar Korrai, Eva Lagunas, Shree Krishna Sharma +1
In this paper, we study a RAN resource-slicing problem for energy-efficient communication in an orthogonal frequency division multiple access (OFDMA) based millimeter-wave (mmWave)…
Digital Twin for Non-Terrestrial Networks: Vision, Challenges, and Enabling Technologies
Hayder Al-Hraishawi, Madyan Alsenwi, Junaid ur Rehman +2
This paper investigates the transformative potential of digital twin (DT) technology for non-terrestrial networks (NTNs). NTNs, comprising airborne and space-borne elements, face u…
Energy-Efficient Precoding and Feeder-Link-Beam Matching Design for Bent-Pipe SATCOM Systems
Vu Nguyen Ha, Juan Carlos Merlano Duncan, Eva Lagunas +2
This paper proposes a joint optimization framework for energy-efficient linear precoding and feeder-link-beam matching design in a multi-gateway multi-beam bent-pipe satellite comm…
Integrated Access and Backhaul via Satellites
Zaid Abdullah, Steven Kisseleff, Eva Lagunas +3
To allow flexible and cost-efficient network densification and deployment, the integrated access and backhaul (IAB) was recently standardized by the third generation partnership pr…
Two-tier User Association and Resource Allocation Design for Integrated Satellite-Terrestrial Networks
Hung Nguyen-Kha, Vu Nguyen Ha, Eva Lagunas +2
This paper presents a study of an integrated satellite-terrestrial network, where Low-Earth-Orbit (LEO) satellites are used to provide the backhaul link between base stations (BSs)…
Large-Scale Beam Placement and Resource Allocation Design for MEO-Constellation SATCOM
Vu Nguyen Ha, Eva Lagunas, Tedros Salih Abdu +3
This paper presents a centralized framework for optimizing the joint design of beam placement, power, and bandwidth allocation in an MEO satellite constellation to fulfill the hete…
Energy-Efficient RIS-Enabled NOMA Communication for 6G LEO Satellite Networks
Wali Ullah Khan, Eva Lagunas, Asad Mahmood +2
This paper proposes an energy-efficient RIS-enabled NOMA communication for LEO satellite networks. The proposed framework simultaneously optimizes the transmit power of ground term…
LEO-to-User Assignment and Resource Allocation for Uplink Transmit Power Minimization
Hung Nguyen-Kha, Vu Nguyen Ha, Eva Lagunas +2
This paper aims to develop satellite-user association and resource allocation mechanisms to minimize the total transmit power for integrated terrestrial and non-terrestrial network…