62 citations · 75 across the 24 of their papers we have counts for
25 papers
Terahertz Inter-Satellite Links: Motivation, Challenges and Opportunities
Chandan Kumar Sheemar, Wali Ullah Khan, Giovanni Iacovelli +5
Inter-satellite links (ISLs) are essential to the evolution of next-generation satellite constellations, providing the foundation for low-latency, resilient, and globally scalable…
Demonstration of Safe Electromagnetic Radiation Emitted by 5G Active Antenna Systems
Sumit Kumar, Chandan Kumar Sheemar, Abdelrahman Astro +2
The careful planning and safe deployment of 5G technologies will bring enormous benefits to society and the economy. Higher frequency, beamforming, and small-cells are key technolo…
Artificial Intelligence Satellite Telecommunication Testbed using Commercial Off-The-Shelf Chipsets
Luis M. Garcés-Socarrás, Amirhossein Nik, Flor Ortiz +13
The Artificial Intelligence Satellite Telecommunications Testbed (AISTT), part of the ESA project SPAICE, is focused on the transformation of the satellite payload by using artific…
Performance Evaluation of Neuromorphic Hardware for Onboard Satellite Communication Applications
Eva Lagunas, Flor Ortiz, Geoffrey Eappen +7
Spiking neural networks (SNNs) implemented on neuromorphic processors (NPs) can enhance the energy efficiency of deployments of artificial intelligence (AI) for specific workloads.…
Interference analysis of Positioning Reference Signals in 5G NTN
Alejandro Gonzalez-Garrido, Jorge Querol, Henk Wymeersch +1
Accurate asset localization holds paramount importance across various industries, ranging from transportation management to search and rescue operations. In scenarios where traditi…
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…
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…
ML-based PBCH symbol detection and equalization for 5G Non-Terrestrial Networks
Inés Larráyoz-Arrigote, Marcele O. K. Mendonca, Alejandro Gonzalez-Garrido +6
This paper delves into the application of Machine Learning (ML) techniques in the realm of 5G Non-Terrestrial Networks (5G-NTN), particularly focusing on symbol detection and equal…
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…
Adaptive Timers and Buffer Optimization for Layer-2 Protocols in 5G Non-Terrestrial Networks
Chandan Kumar Sheemar, Sumit Kumar, Jorge Querol +1
Interest in the integration of Terrestrial Networks (TN) and Non-Terrestrial Networks (NTN); primarily satellites; has been rekindled due to the potential of NTN to provide ubiquit…
Signal Processing Based Antenna Pattern Characterization for MIMO Systems
Chandan Kumar Sheemar, Jorge Querol, Symeon Chatzinotas
Sophisticated antenna technologies are constantly evolving to meet the escalating data demands projected for 6G and future networks. The characterization of these emerging antenna…
IRS Assisted MIMO Full Duplex: Rate Analysis and Beamforming Under Imperfect CSI
Chandan Kumar Sheemar, Sourabh Solanki, Jorge Querol +2
Intelligent reflecting surfaces (IRS) have emerged as a promising technology to enhance the performance of wireless communication systems. By actively manipulating the wireless pro…
Robust Beamforming for IRS Aided MIMO Full Duplex Systems
Chandan Kumar Sheemar, Jorge Querol, Sourabh Solanki +2
In this paper, a novel robust beamforming for an intelligent reflecting surface (IRS) assisted FD system is presented. Since perfect channel state information (CSI) is often challe…
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…
Full-Duplex-Enabled Joint Communications and Sensing with Reconfigurable Intelligent Surfaces
Chandan Kumar Sheemar, George C. Alexandropoulos, Dirk Slock +2
The full-duplex (FD) technology has the potential to radically evolve wireless systems, facilitating the integration of both communications and radar functionalities into a single…
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…
Localization as a key enabler of 6G wireless systems: A comprehensive survey and an outlook
Stylianos E. Trevlakis, Alexandros-Apostolos A. Boulogeorgos, Dimitrios Pliatsios +4
When fully implemented, sixth generation (6G) wireless systems will constitute intelligent wireless networks that enable not only ubiquitous communication but also high-accuracy lo…
Non-Coherent Massive MIMO Integration in Satellite Communication
Victor Monzon, Vu N. Ha, Jorge Querol +1
Massive Multiple Input-Multiple Output (mMIMO) technique has been considered an efficient standard to improve the transmission rate significantly for the following wireless communi…
Architectures and Synchronization Techniques for Distributed Satellite Systems: A Survey
Liz Martinez Marrero, Juan C. Merlano Duncan, Jorge Querol +6
Cohesive Distributed Satellite Systems (CDSS) is a key enabling technology for the future of remote sensing and communication missions. However, they have to meet strict synchroniz…
Parallel and Distributed Hybrid Beamforming for Multicell Millimeter Wave MIMO Full Duplex
Chandan Kumar Sheemar, Symeon Chatzinotas, Dirk Slock +2
Full duplex (FD) is an auspicious wireless technology that holds the potential to double data rates through simultaneous transmission and reception. This paper proposes two innovat…
Random Access Procedure over Non-Terrestrial Networks: From Theory to Practice
O. Kodheli, A. Astro, J. Querol +4
Non-terrestrial Networks (NTNs) have become an appealing concept over the last few years and they are foreseen as a cornerstone for the next generations of mobile communication sys…
End-to-end Precoding Validation over a Live GEO Satellite Forward Link
Jevgenij Krivochiza, Juan Carlos Merlano Duncan, Jorge Querol +5
In this paper we demonstrate end-to-end precoded multi-user multiple-input single-output (MU-MISO) communications over a live GEO satellite link. Precoded communications enable ful…
A Remote Carrier Synchronization Technique for Coherent Distributed Remote Sensing Systems
Juan Merlano Duncan, Liz Martinez-Marrero, Jorge Querol +4
Phase, frequency, and time synchronization are crucial requirements for many applications, such as multi-static remote sensing and communication systems. Moreover, the synchronizat…