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198 results on '"Angeletti, Piero"'

1. Digital Prototype Filter Alternatives for Processing Frequency-Stacked Mobile Subbands Deploying a Single ADC for Beamforming Satellites

Author

Coskun, Adem, Cetinsel, Sevket, Kale, Izzet, Hughes, Robert, Angeletti, Piero, and Ernst, Christoph

Subjects
Electrical Engineering and Systems Science - Signal Processing
Abstract

This article presents a two-stage approach for the processing of frequency-stacked mobile subbands. The frequency stacking is performed in the analog domain to enable the use of a wideband analog-to-digital converter (ADC), instead of employing multiple narrowband ADCs, to support multiple antenna elements for digital satellite beamforming. This analog front end provides a common broadband digital interface to the on-board processor and can be configured to support multiple satellite missions, reducing the cost of commissioning a digital processor for individual satellite missions. This article proposes a framework on the specification of digital prototype filter for the analysis of frequency-stacked mobile subbands. The computational complexity of the analysis operation, with two digital filter alternatives, are evaluated. A series of results, taken from our European Space Agency sponsored project, are presented here to demonstrate the applicability of the proposed two stage approach, reporting on the savings in power consumption when an Nth-band all-pass-based recursive filter having an infinite impulse response is used as the digital prototype filter.

Published
2024
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6. FPGA Implementation of Efficient 2D-FFT Beamforming for On-Board Processing in Satellites

Author

Palisetty, Rakesh, primary, Eappen, Geoffrey, additional, Singh, Vibhum, additional, Socarras, Luis Manuel Garces, additional, Ha, Vu Nguyen, additional, Vásquez-Peralvo, Juan A., additional, Rios, Jorge Luis Gonzalez, additional, Duncan, Juan Carlos Merlano, additional, Martins, Wallace Alves, additional, Chatzinotas, Symeon, additional, Ottersten, Björn, additional, Coskun, Adem, additional, King, Stephen, additional, D’Addio, Salvatore, additional, and Angeletti, Piero, additional

Published
2023
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7. FPGA Implementation of Efficient Beamformer for On-Board Processing in MEO Satellites

Author

Palisetty, Rakesh, primary, Garces Socarras, Luis Manuel, additional, Chaker, Haythem, additional, Singh, Vibhum, additional, Eappen, Geoffrey, additional, Martins, Wallace Alves, additional, Ha, Vu Nguyen, additional, Vásquez-Peralvo, Juan A., additional, Gonzalez Rios, Jorge Luis, additional, Merlano Duncan, Juan Carlos, additional, Chatzinotas, Symeon, additional, Ottersten, Björn, additional, Coskun, Adem, additional, King, Stephen, additional, D’Addio, Salvatore, additional, and Angeletti, Piero, additional

Published
2023
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9. Optimizing a Formation-of-Arrays (FoA) Satellite Antenna System for Very High-Throughput Communications

Author

Bacci, Giacomo, De Gaudenzi, Riccardo, Luise, Marco, Sebastiani, Elena, Angeletti, Piero, and Gonzalez, Jose Ramon

Abstract

Formation of arrays (FoA) distributed antenna technology has recently been proposed to provide 5G-like mobile satellites services in the context of the integration of nonterrestrial with terrestrial networks—the overall system goal being a sufficiently high throughput in terms of bit rate per unit area on the ground. This large distributed array configuration (resulting from the formation of many satellites each carrying its own small antenna) must be carefully engineered to provide the desired benefits. In this article, we tackle some fundamental issues related to FoA design, namely, frequency selectivity, power generation, and optimal formation configuration. Concerning frequency selectivity, we evaluate the intrinsic FoA frequency response assuming a wideband signal, and suggest how to mitigate possible impairments from a communication system perspective. Regarding power generation, we show how to decouple the functions of antenna and solar arrays to come to a power-efficient satellite configuration and design. Finally, in terms of formation optimization, we investigate a formation thinning approach with random placement of satellites on a grid, leading to a significant reduction of secondary beams in the emission of the FoA as well as fully satisfying the constraints placed by optimum power generation.

Published
2024
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15. Digital Prototype Filter Alternatives for Processing Frequency-Stacked Mobile Subbands Deploying a Single ADC for Beamforming Satellites

Author

Coskun, Adem, Cetinsel, Sevket, Kale, Izzet, Hughes, Robert, Angeletti, Piero, and Ernst, Christoph

Abstract

This article presents a two-stage approach for the processing of frequency-stacked mobile subbands. The frequency stacking is performed in the analog domain to enable the use of a wideband analog-to-digital converter (ADC), instead of employing multiple narrowband ADCs, to support multiple antenna elements for digital satellite beamforming. This analog front end provides a common broadband digital interface to the on-board processor and can be configured to support multiple satellite missions, reducing the cost of commissioning a digital processor for individual satellite missions. This article proposes a framework on the specification of digital prototype filter for the analysis of frequency-stacked mobile subbands. The computational complexity of the analysis operation, with two digital filter alternatives, are evaluated. A series of results, taken from our European Space Agency sponsored project, are presented here to demonstrate the applicability of the proposed two stage approach, reporting on the savings in power consumption when an Nth-band all-pass-based recursive filter having an infinite impulse response is used as the digital prototype filter.

Published
2023
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16. Fully-Metallic Additively Manufactured Monolithic Double-Ridged Waveguide Rotman Lens in the K/K a -Band.

Author

Fonseca, Nelson J. G., Gomanne, Sophie-Abigaël, Rico-Fernández, José, Jankovic, Petar, Galdeano, Jaione, Toso, Giovanni, Angeletti, Piero, Arrebola, Manuel, and Quevedo-Teruel, Oscar

Subjects
TELECOMMUNICATION satellites, REFLECTANCE, ANTENNAS (Electronics), SUBSTRATE integrated waveguides, DIRECTIONAL antennas, STANDARD deviations, BEAMFORMING
Abstract

This paper reports on the design and experimental validation of a fully-metallic double-ridged waveguide 10 × 10 Rotman lens additively manufactured as a single part. The wide band operation of this quasi-optical beamformer enables us to cover the uplink and downlink frequencies allocated to satellite communications in the K/K a -band, from 17.3 GHz to 30 GHz. The feeding port design was adjusted to enable vertical printing, thus minimizing the use of supporting structures. A prototype was manufactured and tested. The reported results indicate losses in the range of 0.5 dB in the lower-frequency band and 0.8 dB in the upper-frequency band, including the waveguide transitions added for test purposes. The measured reflection and coupling coefficients remain below −11.5 dB over the operating band. The standard deviation of the residual phase error across the array ports is below 5 ° in simulation and below 10 ° in measurements. Array factors synthesized using the scattering parameters confirm the good stability of the beamforming functionality over the wide frequency band analyzed. This monolithic design is a promising step toward more integrated antenna systems, such as a compact dual-stack configuration for planar array design. [ABSTRACT FROM AUTHOR]

Published
2023
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20. Technology developments and R&D activities at the European Space Agency for satellite communication payloads based on active antennas and digital processors

Author

D'Addio, Salvatore, primary, Angeletti, Piero, additional, Ayllon, Natanael, additional, Davies, Iain, additional, Valenta, Vaclav, additional, Cortazar, Bingen, additional, Deborgies, Francois, additional, Folio, Benedicte-Marie, additional, Toso, Giovanni, additional, Fonseca, Nelson, additional, and Ernst, Christoph, additional

Published
2022
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30. On-ground beam forming techniques for mobile satellite systems applications

Author

Angeletti, Piero, primary, Cioni, Stefano, additional, Tronc, Jerome, additional, Campa, Claudio, additional, Di Cecca, Filippo, additional, Gallinaro, Gennaro, additional, Rossini, Eugenio, additional, Suffritti, Rosalba, additional, Candreva, Enzo, additional, Primo, Elisabetta, additional, and Vanelli-Coralli, Alessandro, additional

Published
2015
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31. List of contributors

Author

Alagha, Nader, primary, Alegre-Godoy, Ricard, additional, Angeletti, Piero, additional, Arapoglou, Pantelis-Daniel, additional, Arnau, Jesús, additional, Byman, Aaron, additional, Campa, Claudio, additional, Candreva, Enzo, additional, Di Cecca, Filippo, additional, Chatzinotas, Symeon, additional, Chen, Xianfu, additional, Christopoulos, Dimitrios, additional, Chuberre, Nicolas, additional, Cioni, Stefano, additional, Cocco, Giuseppe, additional, Evans, Barry, additional, Gallinaro, Gennaro, additional, De Gaudenzi, Riccardo, additional, Ginesi, Alberto, additional, Grotz, Joel, additional, Guidotti, Alessandro, additional, Gupta, Smrati, additional, Höyhtyä, Marko, additional, Hulkkonen, Ari, additional, Ibars, Christian, additional, Janhunen, Janne, additional, de Lamare, Rodrigo, additional, Leinonen, Marko, additional, Liolis, Konstantinos, additional, Lopez-Benitez, Miguel, additional, Lucani, Daniel E., additional, Mämmelä, Aarne, additional, Maleki, Sina, additional, Mosquera, Carlos, additional, Ottersten, Björn, additional, Pérez-Neira, Ana, additional, Piazza, Roberto, additional, Prieto-Cerdeira, Roberto, additional, Primo, Elisabetta, additional, del Río Herrero, Oscar, additional, Roivainen, Antti, additional, Rossini, Eugenio, additional, Shankar, Bhavani M.R., additional, Sharma, Shree Krishna, additional, Suffritti, Rosalba, additional, Tang, Wuchen, additional, Tarchi, Daniele, additional, Taricco, Giorgio, additional, Tronc, Jerome, additional, Vanelli-Coralli, Alessandro, additional, Vázquez-Castro, Angeles, additional, Vázquez, Miguel Angel, additional, Vieira, Fausto, additional, and Ylitalo, Juha, additional

Published
2015
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33. Accurate characterization of TWTA distortion in multicarrier operation by means of a correlation-based method

Author

Aloisio, Marinella, Angeletti, Piero, Casini, Enrico, Colzi, Enrico, D'Addio, Salvatore, and Oliva-Balague, Roger

Subjects
Amplifiers (Electronics) -- Design and construction, Communications satellites -- Evaluation, Electric distortion -- Analysis, Traveling-wave tubes -- Evaluation, Business, Electronics, Electronics and electrical industries
Abstract

The article presents a newly developed correlation-based approach that can be used for an accurate characterization of the traveling-wave tube amplifier (TWTA) distortion in various multicarrier operations. The methodology is shown to be extremely accurate and efficient and hence can be used in various other applications.

Published
2009

44. Multiport power amplifiers for flexible satellite antennas and payloads

Author

Lisi, Marco and Angeletti, Piero

Subjects
Power amplifiers -- Research, Satellite communications -- Equipment and supplies, Satellite communications, Business, Electronics and electrical industries, Engineering and manufacturing industries, Telecommunications industry
Abstract

The use of multiport power amplifiers for satellite transponders is described. These amplifiers have enabled higher edge of coverage gains and more efficient use of the frequency spectrum.

Published
2010

45. Beam-forming network development for European satellite antennas

Author

Angeletti, Piero and Lisi, Marco

Subjects
Beamforming -- Research, Aerospace engineering -- Research, Artificial satellites, European -- Research, Business, Electronics and electrical industries, Engineering and manufacturing industries, Telecommunications industry
Abstract

The most recent developments in beam-forming network (BFN) technology for satellite multiple beams and reconfigurable antennas in Europe are discussed. The European space industry, which has been at the forefront of development of these systems, needs to expand development and production capability to attain independence and competitiveness.

Published
2007

46. Generalized Kronecker Array Transform.

Author

Angeletti, Piero

Subjects
MATRIX multiplications, KRONECKER products, MATRIX decomposition, FAST Fourier transforms, ARRAY processing
Abstract

Fast evaluation of the array response matrix and its vector or matrix products play a central role in several applied electromagnetics and array processing applications. In this context, the Kronecker Array Transform (KAT) has been introduced by Ribeiro and Nascimento as an efficient factorization technique that can be applied when the elements of a planar array and the wavevectors exhibit separability. The computational savings leverage on the decomposition of the full array response matrix in the Kronecker product of two smaller array response matrices. In this contribution we extend and apply the generalized Kronecker product introduced by Fino and Algazi to the array response matrix decomposition problem. The resulting Generalized Kronecker Array Transform (GKAT) broadens the class of problems that can be addressed while achieving the same computational savings. The complexity of GKAT is compared with Non-Uniform Fast Fourier Transform (NUFFT), and optimal integration of the two techniques is elaborated. [ABSTRACT FROM AUTHOR]

Published
2021
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48. Future technologies for very high throughput satellite systems.

Author

De Gaudenzi, Riccardo, Angeletti, Piero, Petrolati, Daniele, and Re, Emiliano

Subjects
HIGH technology, SYSTEMS design, 5G networks, TELECOMMUNICATION satellites
Abstract

Summary: In this paper, we investigate the possible satellite's role and technical solutions required for providing broadband services complementing the terrestrial fifth generation wireless standards. First, we review the satellite networks use cases, services, and system requirements. Then we investigate the satellite potential purpose for broadband service provision and the associated challenges with focus on the system and space/ground technological aspects. Different architectural satellite network solutions are illustrated jointly with the key system design trade‐offs. Particular emphasis is dedicated to the payload architecture. Finally, we illustrate the space and ground segment technologies enabling the successful satellite contribution to broadband services provision. [ABSTRACT FROM AUTHOR]

Published
2020
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