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He, Y. (author), Coutino, M. (author), Isufi, E. (author), Leus, G. (author)In this work, we focus on partitioning dynamic graphs with two types of nodes (bi-colored), though not necessarily bipartite graphs. They commonly appear in communication network applications, e.g., one color being base stations, the other users, and the dynamic process being the varying connection status between base stations and moving users....conference paper 2022
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de Martín, L. (author), van Rossum, W. (author)Doppler ambiguities can be avoided by transmitting a burst with irregular pulse intervals and processing it with sparse reconstruction on receive. Furthermore, the time interval for each individual pulse can be optimized to maximize the recovery success. In this line, this work investigates the optimization of pulse intervals for unambiguous...conference paper 2022
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Coutino, M. (author), Uysal, F. (author), Anitori, L. (author)This paper introduces a general framework for waveform-aware optimal window design for mismatch processing. First, the linear relationship between the window function and the output of the mismatch filter, for both frequency and time windowing and a particular waveform, is modeled. Making use of such a relation, typical window constraints are...conference paper 2022
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Natali, A. (author), Isufi, E. (author), Coutino Minguez, M.A. (author)This work proposes an algorithmic framework to learn time-varying graphs from online data. The generality offered by the framework renders it model-independent, i.e., it can be theoretically analyzed in its abstract formulation and then instantiated under a variety of model-dependent graph learning problems. This is possible by phrasing (time...article 2022
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Kokke, C.A. (author), Coutino Minguez, M.A. (author), Heusdens, R. (author), Leus, G. (author), Antori, L. (author)Doppler velocity estimation in pulse-Doppler radar is done by evaluating the target returns of bursts of pulses. While this provides convenience and accuracy, it requires multiple pulses. In adaptive and cognitive radar systems, the ability to adapt on consecutive pulses, instead of bursts, brings potential performance benefits. Hence, with...conference paper 2022
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Korevaar, C.W. (author), Boschma, J.J. (author), den Breeje, R. (author), Ebert, J. (author)Optical feeder links (OFLs) benefit from the vast amount of bandwidth available in the THz-regime of the electro-magnetic spectrum, and could enable future terabit-per-second satellite systems. This study assesses the end-to-end performance of analog coherent OFLs for digital video broadcasting (DVB) applications, employing phase modulation (PM)...conference paper 2022
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Wezeman, R.S. (author), Chiscop, I. (author), Anitori, L. (author), van Rossum, W.L. (author)Compressive sensing is a signal processing technique used to acquire and reconstruct sparse signals using significantly fewer measurement samples. Compressive sensing requires finding the most sparse solution to an underdetermined linear system, which is an NP-hard problem and as a consequence in practise is only solved approximately. In our...conference paper 2022
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Natali, A. (author), Isufi, E. (author), Coutino, M. (author), Leus, G. (author)Topology identification is an important problem across many disciplines, since it reveals pairwise interactions among entities and can be used to interpret graph data. In many scenarios, however, this (unknown) topology is time-varying, rendering the problem even harder. In this paper, we focus on a time-varying version of the structural...conference paper 2021
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de Martin, L. (author), van Rossum, W. (author), Ribeiro, D. (author), Anitori, L. (author)It is well known that noise-like waveforms have the inherent property of suppressing ambiguities due to their nonrepetitive nature, as opposed to the more classical linear frequency modulated (LFM) pulsed waveforms. This aperiodicity also improves the robustness against jammers, making these waveforms harder to detect and classify by an enemy....article 2020
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Cox, P.B. (author), van Rossum, W.L. (author)Recent advances in digital beam forming for phased arrays in combination with digital signal processing should enable the development of multibeam radar in a bistatic configuration. In the bistatic setting, the pulse travelling outward from the transmitter should be followed or “chased” by the receiver. During transmission, depending on the...conference paper 2020
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van Rossum, W.L. (author), Anitori, L. (author)In this article a novel waveform based on agile (or irregular) pulse intervals is presented as a potential approach to simultaneously resolve both range and Doppler ambiguities using a single burst in radar measurements containing very far away and/or very fast targets. The paper shows that, the combination of irregularly spaced transmitted...conference paper 2020
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Thomas, E. (author), Gabriel, A. (author), el Assal, K.M. (author)In traditional video decoding applications, the number of elementary streams that a hardware decoding platform of an end device can decode is determined at runtime by the. Upon request by the application, the decoding platform verifies whether a new decoding instance with an associated requirement in terms of data rate can fit under the current...conference paper 2020
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Toet, A. (author), Hoogervorst, M.A. (author)In military operations signature reduction techniques such as camouflage nets, low-emissive paints, and camouflage patterns are typically deployed to optimize the survivability of high value assets by minimizing their detectability. Various methods have been developed to assess the effectiveness of these camouflage measures. There are three main...article 2020
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Thomas, E.D.R. (author), Gabriel, A. (author), Niamut, O.A. (author), Dijkstra-Soudarissane, S.S. (author)The current state of the art of video coding lacks specific tools to efficiently deal with ultra-high resolutions such as 8K video both at a hardware and software level. At the same time, the increase in video resolutions combined with a larger variety in display resolutions results in a need for spatial scalability at low computational...conference paper 2019
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Dijkstra-Soudarissanane, S.S. (author), Assal, K.E. (author), Gunkel, S.N.B. (author), ter Haar, F.T. (author), Hindriks, H.N. (author), Kleinrouweler, J.W.M. (author), Niamut, O. (author)Recent developments in key technologies like 5G, Augmented and Virtual Reality (AR/VR) and Tactile Internet result in new possibilities for communication. Particularly, these key digital technologies can enable remote communication and collaboration in remote experiences. In this demo, we work towards 6-degrees of freedom (DoF) photo-realistic...conference paper 2019
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Toet, A. (author), Hogervorst, M.A. (author)In military operations signature reduction techniques such as camouflage nets, low-emissive paints, and camouflage patterns are typically deployed to optimize the survivability of high value assets by minimizing their detectability. Various methods have been developed to assess the effectiveness of these camouflage measures. There are three main...article 2019
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- Toet, A. (author), Hogervorst, M.A. (author) public lecture 2019
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Ara, H.A. (author), Behrouzian, A. (author), Hendriks, M. (author), Geilen, M. (author), Goswami, D. (author), Basten, T. (author)Multi-scale dataflow models have actors acting at multiple granularity levels, e.g., a dataflow model of a video processing application with operations on frame, line, and pixel level. The state of the art timing analysis methods for both static and dynamic dataflow types aggregate the behaviours across all granularity levels into one, often...article 2018
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Massaad, J. (author), van Neer, P.L.M.J. (author), van Willigen, D. (author), de Jong, N. (author), Pertijs, M. (author), Verweij, M. (author)Typically, ultrasonic flow meters assume linear wave propagation. Nevertheless, if the transducers of an ultrasonic flow sensor excite a pressure wave with a high amplitude, nonlinear wave propagation effects become significant. The appearance of higher harmonics increases the bandwidth of the received signal, which may potentially lead to a...conference paper 2018
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van Amerongen, A. (author), Rietjens, J. (author), Campo, J. (author), Dogan, E. (author), DIngjan, J. (author), Nalla, R. (author), Caron, J.F. (author), Hasekamp, O. (author)We have developed a 6 dm3-sized optical instrument to characterize the microphysical properties of fine particulate matter or aerosol in the Earth atmosphere from low Earth orbit. Our instrument can provide detailed and worldwide knowledge of aerosol amount, type and properties. This is important for climate and ecosystem science and human...conference paper 2018