Searched for: subject%3A%22Radio%22
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Frey, S. (author), Zhang, Y. (author), Perger, K. (author), An, T. (author), Gabányi, K. (author), Gurvits, L. (author), Hwang, C. Y. (author), Koptelova, E. (author), Paragi, Z. (author), Fogasy, J. (author)
Context. The existence of accreting supermassive black holes of up to billions of solar masses at early cosmological epochs (in the context of this work, redshifts z & 6) requires very fast growth rates that are challenging to explain. The presence of a relativistic jet can be a direct indication of activity and accretion status in active...
journal article 2024
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Srikanth, Vikram (author)
Small satellite systems such as CubeSats and PocketQubes have strict requirements in terms of size, weight, and power available onboard. In light of these constraints, small satellite systems typically omit the inclusion of a ranging system due to its power and specialized hardware requirements. However, new research in satellite ranging...
master thesis 2023
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Agarwal, Sakshi (author)
Reconfigurable Intelligent Surfaces (RIS) are envisioned to become a pivotal transformative technology within the realm of 6G mobile networks. In this study, we introduce three heuristic algorithms designed to optimize radio resource management, ultimately enhancing throughput within a RIS-enhanced mobile network. Our findings demonstrate that...
master thesis 2023
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Tao, Jack (author)
With the development of 5G/6G communication technology, an increasing number of communication protocols for data transmission are created and implemented. At the same time, the redundancy of packet headers has become a matter to be optimized when transferring packets across different protocol layers, which causes high resource occupancy, low...
master thesis 2023
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Beikmirza, M.R. (author), Shen, Y. (author), de Vreede, L.C.N. (author), Alavi, S.M. (author)
This article presents a wideband, energy-efficient digital transmitter (DTX) suitable for multi-mode/multi-band wireless communication applications. It features various operation modes comprising Cartesian (Modes-1/-2) and multi-phase (Modes-3/-4) configurations utilizing LO clocks with different duty cycle in the interleaving/non...
journal article 2023
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Montazerolghaem, M.A. (author), de Vreede, L.C.N. (author), Babaie, M. (author)
By introducing three different techniques, this article, for the first time, presents a wideband highly linear receiver (RX) capable of handling blocking scenarios in fifth-generation (5G) microcell base station applications. First, a parallel preselect filter is introduced to satisfy the base station co-location blocking requirements. Next,...
journal article 2023
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Yang, Jun (author), Paragi, Zsolt (author), Frey, Sándor (author), Gurvits, L. (author), Liao, Mai (author), Liu, Xiang (author), Cui, Lang (author), Yang, Xiaolong (author), Chen, Wen (author)
Dwarf galaxies are characterized by a very low luminosity and low mass. Because of significant accretion and ejection activity of massive black holes, some dwarf galaxies also host low-luminosity active galactic nuclei (AGNs). In a few dwarf AGNs, very long baseline interferometry (VLBI) observations have found faint non-thermal radio...
journal article 2023
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Tiberius, C.C.J.M. (author), Janssen, G.J.M. (author), Koelemeij, Jeroen (author), Dierikx, Erik (author), Diouf, C.E.V. (author), Dun, H. (author)
This paper presents a terrestrial networked positioning system that obtains a reliable time reference from a national time scale realization and distributes it in a prototype to six roadside base stations through a fiber-optic Gigabit Ethernet network. Wireless wideband signals are transmitted by the base stations, thereby enabling...
journal article 2023
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Hudson, Ben (author), Gurvits, L. (author), Wielgus, Maciek (author), Paragi, Zsolt (author), Liu, Lei (author), Zheng, Weimin (author)
Recent advances in technology coupled with the progress of observational radio astronomy methods resulted in achieving a major milestone of astrophysics - a direct image of the shadow of a supermassive black hole, taken by the Earth-based Event Horizon Telescope (EHT). The EHT was able to achieve a resolution of ∼20μas, enabling it to resolve...
journal article 2023
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Chen, Gang (author), Dong, Wei (author), Peng, Peng (author), Alonso Mora, J. (author), Zhu, Xiangyang (author)
Particle-based dynamic occupancy maps were proposed in recent years to model the obstacles in dynamic environments. Current particle-based maps describe the occupancy status in discrete grid form and suffer from the grid size problem, wherein a large grid size is unfavorable for motion planning while a small grid size lowers efficiency and...
journal article 2023
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Singh, G.D. (author), Nemati, Hossein Mashad (author), Alavi, S.M. (author), de Vreede, L.C.N. (author)
This article presents an inverted Doherty power amplifier (IDPA) made load insensitive up to 2:1 voltage standing wave ratio (VSWR) across its fractional bandwidth with a very compact wideband impedance sensor embedded in its output power-combining network (OPCN). To correct for load variation, a low-loss tunable resonator (TR) is used to...
journal article 2023
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Petroulakis, Nikolaos (author), Mattsson, Mats-Olof (author), Chatziadam, Panos (author), Simko, Myrtill (author), Gavrielides, Andreas (author), Yiorkas, Andrianos (author), Zeni, Olga (author), Scarfi, MR (author), Spirito, M. (author)
The evolution of emerging technologies that use Radio Frequency Electromagnetic Field (RF-EMF ) has increased the interest of the scientific community and society regarding the possible adverse effects on human health and the environment. This article provides NextGEM’s vision to<br/>assure safety for EU citizens when employing existing and...
journal article 2023
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Shen, Y. (author), Hoogelander, M. (author), Bootsman, R.J. (author), Alavi, S.M. (author), de Vreede, L.C.N. (author)
A current-mode direct-digital RF modulator (DDRM)-based transmitter (TX) architecture is proposed in this article for energy-efficient wireless applications. To demonstrate its key principles, a 2×13 bit demonstrator is implemented in a 40-nm CMOS technology. This DDRM can operate standalone or as a driver for a common-gate (CG)/common-base ...
journal article 2023
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Anders, Jens (author), Babaie, M. (author), Bashir, Imran (author), Charbon, Edoardo (author), Geck, Lotte (author), Ibrahim, Mohamed I. (author), Sebastiano, F. (author), Staszewski, R.B. (author), Vladimirescu, A. (author)
Over the past decade, significant progress in quantum technologies has been made, and hence, engineering of these systems has become an important research area. Many researchers have become interested in studying ways in which classical integrated circuits can be used to complement quantum mechanical systems, enabling more compact, performant...
journal article 2023
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Sturm, G.S.J. (author), van der Wurff, A. (author), Linnenbank, S. (author), Bonnet, J. (author), Koppert, A. (author)
Thermal pathogen suppression in glasshouse horticulture by treatment with steam generated through combustion of fossil fuel will become progressively less desirable. Radio wave treatment could be an alternative. It has several advantages, the most notable is that it generates heat where it is needed in soil, so that it avoids heat losses and...
journal article 2023
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Falckenheiner Soria, Sebastian (author)
Synthetic Aperture Radars (SAR) have demonstrated to be great instruments for space-based Earth observation in the microwave frequency. Metasurface antennas, on the other side, are a new type of planar antennas with a great potential for space applications, as they are compact and easy to produce. Several methods have been developed in the past...
master thesis 2022
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de Laat, Willem (author)
The need to receive and process higher data rates in computer clusters is an ever-increasing trend. This also applies to radio-astronomic systems, which have become more distributed over the past decades, increasing data traffic between antennas and processing facilities. At the antenna, Field Programmable Gate Arrays (FPGAs) digitise the radio...
master thesis 2022
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Bećiri, Sanel (author)
This is a graduation project within the Public Building studio, where multiplicity and human scale is researched in the typology of a music venue. Hereby the theme of the studio, “Music Marvel - Music &amp; Popular Culture Re-Wired”, is explored and experimented with.<br/><br/>The Binckhorst, in The Hague, is on the brink of change. The formal...
master thesis 2022
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Tanis, Tobias (author)
Autonomous orbit determination could help reducing the growing load on ground-based deep space networks. For small satellites, orbit determination based solely on inter-satellite measurements could be a strong alternative for conventional ground-based navigation support. The possibilities of this autonomous orbit determination method are...
master thesis 2022
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Louwen, Anton (author)
Radio frequency fingerprinting has been identified as a method to increase integrity in aircraft surveillance while retaining its openness. One way to uniquely determine transmitting devices is to distill the device its radio frequency (RF) fingerprint by looking at the physical features of the message signal it transmits. This physical layer...
master thesis 2022
Searched for: subject%3A%22Radio%22
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