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321 results on '"Cattoni, Andrea"'

103. Ultrathin PECVD epitaxial Si solar cells on glass via low-temperature transfer process

Author

Cariou, Romain, Chen, Wanghua, Cosme-Bolanos, Ismael, Maurice, Jean-Luc, Foldyna, Martin, Depauw, Valérie, Patriarche, Gilles, Gaucher, Alexandre, Cattoni, Andrea, Massiot, Ines, Collin, Stéphane, Cadel, Emmanuel, Pareige, Philippe, Roca I Cabarrocas, Pere, Laboratoire de physique des interfaces et des couches minces [Palaiseau] (LPICM), École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), IMEC (IMEC), Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven), Laboratoire de photonique et de nanostructures (LPN), Centre National de la Recherche Scientifique (CNRS), Groupe de physique des matériaux (GPM), Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2015

105. Cognitive Radio and Networking for Heterogeneous Wireless Networks

Author

Di Benedetto, Maria-Gabriella, Cattoni, Andrea, Fiorina, Jocelyn, Bader, Faouzi, De Nardis, Luca, Università degli Studi di Roma 'La Sapienza' = Sapienza University [Rome], Laboratoire des signaux et systèmes (L2S), Université Paris-Sud - Paris 11 (UP11)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Institut d'Électronique et des Technologies du numéRique (IETR), Université de Nantes (UN)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Università degli Studi di Roma 'La Sapienza' = Sapienza University [Rome] (UNIROMA), Université de Nantes (UN)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), and Nantes Université (NU)-Université de Rennes 1 (UR1)

Subjects
[SPI]Engineering Sciences [physics], [SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing
Abstract

International audience; This book, written by leading experts from academia and industry, offers a condensed overview on hot topics among the Cognitive Radios and Networks scientific and industrial communities (including those considered within the framework of the European COST Action IC0902) and presents exciting visions for the future. Examples of the subjects considered include the design of new filter bank-based air interfaces for spectrum sharing, medium access control design protocols, the design of cloud-based radio access networks, an evolutionary vision for the development and deployment of cognitive TCP/IP, and regulations relevant to the development of a spectrum sharing market. The concluding chapter comprises a practical, hands-on tutorial for those interested in developing their own research test beds. By focusing on the most recent advances and future avenues, this book will assist researchers in understanding the current issues and solutions in Cognitive Radios and Networks designs.

Published
2015

106. Reflective Back Contacts for Ultrathin Cu(In,Ga)Se2-Based Solar Cells

Author

Gouillart, Louis, Collin, Stephane, Chen, Wei-Chao, Cattoni, Andrea, Goffard, Julie, Riekehr, Lars, Keller, Jan, Jubault, Marie, Naghavi, Negar, and Edoff, Marika

Abstract

We report on the development of highly reflective back contacts (RBCs) made of multilayer stacks for ultrathin CIGS solar cells. Two architectures are compared: they are made of a silver mirror coated either with a single layer of In2O3:Sn (ITO) or with a bilayer of ZnO:Al/ITO. Due to the improvement of CIGS rear reflectance, both back contacts result in a significant external quantum efficiency enhancement, in agreement with optical simulations. However, solar cells fabricated with Ag/ITO back contacts exhibit a strong shunting behavior. The key role of the ZnO:Al layer to control the morphology of the top ITO layer and to avoid silver diffusion through the back contact is highlighted. For a 500-nm-thick CIGS layer, this optimized RBC leads to a best cell with a short-circuit current of 27.8 mA/cm2 (+2.2 mA/cm2 as compared to a Mo back contact) and a 12.2%-efficiency (+2.5% absolute).

Published
2020
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108. Spectrum aggregation : Initial outcomes from SAMURAI project

Author

Vivier, Guillaume, Badic, Biljana, Cattoni, Andrea, Choi, Hyung-Nam, Duplicy, Jonathan, Kaltenberger, Florian, Kovacs, Istvan Z., Nguyen, Hung T., Sezginer, Serdar, Vivier, Guillaume, Badic, Biljana, Cattoni, Andrea, Choi, Hyung-Nam, Duplicy, Jonathan, Kaltenberger, Florian, Kovacs, Istvan Z., Nguyen, Hung T., and Sezginer, Serdar

Subjects
4G, Carrier Aggregation, LTE-Advanced, system simulation
Published
2011

111. Time-Resolved Photoluminescence in Gold Nanoantennas

Author

Sakat, Emilie, primary, Bargigia, Ilaria, additional, Celebrano, Michele, additional, Cattoni, Andrea, additional, Collin, Stéphane, additional, Brida, Daniele, additional, Finazzi, Marco, additional, D’Andrea, Cosimo, additional, and Biagioni, Paolo, additional

Published
2016
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113. 200nm-Thick GaAs solar cells with a nanostructured silver mirror

Author

Chen, Hung-Ling, primary, Cattoni, Andrea, additional, Vandamme, Nicolas, additional, Goffard, Julie, additional, Lemaitre, Aristide, additional, Delamarre, Amaury, additional, Behaghel, Benoit, additional, Watanabe, Kentaroh, additional, Sugiyama, Masakazu, additional, Guillemoles, Jean-Francois, additional, and Collin, Stephane, additional

Published
2016
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114. An end-to-end testing ecosystem for 5G

Author

Cattoni, Andrea F., primary, Madueno, German Corrales, additional, Dieudonne, Michael, additional, Merino, Pedro, additional, Zayas, Almudena Diaz, additional, Salmeron, Alberto, additional, Carlier, Frederik, additional, Germain, Bart Saint, additional, Morris, Donald, additional, Figueiredo, Ricardo, additional, Caffrey, Jeanne, additional, Banos, Janie, additional, Cardenas, Carlos, additional, Roche, Niall, additional, and Moore, Alastair, additional

Published
2016
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115. Multi-resonant light trapping in ultrathin CIGS solar cells

Author

Goffard, Julie, primary, Cattoni, Andrea, additional, Mollica, Fabien, additional, Jubault, Marie, additional, Colin, Clement, additional, Guillemoles, Jean-Francois, additional, Lincot, Daniel, additional, Naghavi, Negar, additional, and Collin, Stephane, additional

Published
2016
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117. Ultrathin PECVD epitaxial Si solar cells on glass via low-temperature transfer process

Author

Cariou, Romain, primary, Chen, Wanghua, additional, Cosme-Bolanos, Ismael, additional, Maurice, Jean-Luc, additional, Foldyna, Martin, additional, Depauw, Valérie, additional, Patriarche, Gilles, additional, Gaucher, Alexandre, additional, Cattoni, Andrea, additional, Massiot, Ines, additional, Collin, Stéphane, additional, Cadel, Emmanuel, additional, Pareige, Philippe, additional, and Roca i Cabarrocas, Pere, additional

Published
2016
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123. Real-world experimentation of distributed DSA network algorithms

Author

Tonelli, Oscar, Berardinelli, Gilberto, Tavares, Fernando Menezes Leitão, Cattoni, Andrea Fabio, Popovski, Petar, Sørensen, Troels Bundgaard, and Mogensen, Preben

Subjects
Experimental Investigation, Dynamic Spectrum Allocation, Testbed, Software Platform, Software Defined Radio, Cognitive Radio
Abstract

The problem of spectrum scarcity in uncoordinated and/or heterogeneous wireless networks is the key aspect driving the research in the field of flexible management of frequency resources. In particular, distributed dynamic spectrum access (DSA) algorithms enable an efficient sharing of the available spectrum by nodes in a network, without centralized coordination. While proof-of-concept and statistical validation of such algorithms is typically achieved by using system level simulations, experimental activities are valuable contributions for the investigation of particular aspects such as a dynamic propagation environment, human presence impact and terminals mobility. This chapter focuses on the practical aspects related to the real world-experimentation with distributed DSA network algorithms over a testbed network. Challenges and solutions are extensively discussed, from the testbed design to the setup of experiments. A practical example of experimentation process with a DSA algorithm is also provided.

Published
2013

125. Light absorption enhancement in ultra-thin layers for hot-carrier solar cells: first developments towards the experimental demonstration of an enhanced hot-carrier effect with light trapping

Author

Freundlich, Alexandre, Lombez, Laurent, Sugiyama, Masakazu, Giteau, Maxime, Watanabe, Kentaroh, Miyashita, Naoya, Sodabanlu, Hassanet, Goffard, Julie, Delamarre, Amaury, Suchet, Daniel, Tamaki, Ryo, Jehl, Zacharie, Lombez, Laurent, Sugiyama, Masakazu, Cattoni, Andrea, Collin, Stéphane, Guillemoles, Jean-François, and Okada, Yoshitaka

Published
2019
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130. Architecture Design Approaches and Issues in Cross Layer Systems

Author

Cattoni, Andrea Fabio, Sørensen, Troels Bundgaard, Mogensen, Preben, Rashvand, Habib, and S. Kavian, Yousef

Subjects
Cognitive Radio Technology, cross-layer
Abstract

However, Cross Layer also carries a risk due to possibly unexpected and undesired effects. In this chapter, the authors provide architecture designers with a set of guidelines synthesized from an analysis of the state of the art, but enriched with the perspective of the development of future generations of communication systems such as Cognitive Radio. Wireless communications are a fast grown part of the telecommunication market. While new types of traffic and challenges related to the wireless medium are appearing, the methodologies for designing system architectures are substantially remaining the same. Under the increasing pressure of market, users, and physical medium issues, designers are in the need for new approaches.Cross Layer becomes than a handy solution for coping with such problems. In fact, it allows both tighter optimizations of the existing functionalities, and the introduction of new ones, that do not fit within the traditional protocol stack design methodology. However, Cross Layer also carries a risk due to possibly unexpected and undesired effects. In this chapter we want to provide architecture designers with a set of tools and recommendations synthesized from an analysis of the state of art, but enriched with the perspective of the development of future generations of communication systems such as Cognitive Radio.

Published
2012

134. Spectrum Aggregation: initial outcomes from SAMURAI project

Author

Vivier, Guillame, Badic, Biljana, Cattoni, Andrea Fabio, Choi, Hyung-Nam, Duplicy, Jonathan, Kaltenberger, Florian, Kovacs, Istvàn, Nguyen, Hung Tuan, Sezginer, Serdar, Cunningham, Paul, and Cunningham, Miriam

Abstract

Multi-user MIMO and Spectrum Aggregation (also referred to Carrier Aggregation) are two key enablers of next generation wireless systems. Although those techniques were already quite well investigated at theoretical level, their practical implementation is not immediate and raises numerous challenges. The SAMURAI project aims at investigating such challenges as well as at providing realistic performance results. This paper presents first outcomes of the project, with a specific focus of Carrier Aggregation (CA). Two aspects are discussed: CA at PHY/RF level with implementation challenges. Then, the system aspect of CA, providing new flexibility in terms of radio resource management is investigated. System simulations show capacity improvement when CA is enabled. SAMURAI outcomes in the MU-MIMO aspects are reported in a companion paper.

Published
2011

137. Interference mitigation in cognitive femtocells

Author

W. O. da Costa Gustavo, Victor Alvarez Roig, E. Mogensen Preben, and F. Cattoni Andrea

Subjects
Cognitive radio, Computer science, business.industry, Femto, Femtocell, Cellular network, Throughput, Adjacent-channel interference, business, Frequency reuse, Frequency allocation, Power control, Computer network
Abstract

Femtocells are expected to take a major role on increasing the data rates on cellular network access over the next years. However, femtocells pose significant challenges, especially in terms of interference management and mitigation. In femtocell scenario, the costs for tradional network planning, management and optimization can be prohibitive. Instead, self-optimization of an uncoordinated deployment should be considered. Cognitive Radio enabled femtocells are considered to be a promising solution to enable self-optimizing femtocells to effectively manage the inter-cell interference, especially in densely deployed femto scenarios. In this paper, two key elements of cognitive femtocells are combined: a power control algorithm and a fully distributed dynamic spectrum allocation method. The resulting solution was evaluated through system-level simulations and compared to the separate algorithms and fixed frequency reuses. The outage throughput performance of the combined algorithm exceeds all other options, proving the efficiency of the method in reducing inter-cell interference.

Published
2010

146. Ultrathin GaAs Solar Cells With a Silver Back Mirror

Author

Vandamme, Nicolas, primary, Chen, Hung-Ling, additional, Gaucher, Alexandre, additional, Behaghel, Benoit, additional, Lemaitre, Aristide, additional, Cattoni, Andrea, additional, Dupuis, Christophe, additional, Bardou, Nathalie, additional, Guillemoles, Jean-Francois, additional, and Collin, Stephane, additional

Published
2015
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149. Surface electronic and magnetic properties of La(2/3)Sr(1/3)MnO(3) thin films with extended metallicity above the Curie temperature

Author

Bertacco, Riccardo, Tagliaferri, Alberto, Riva, M., Signorini, L., Cantoni, Matteo, Cattoni, Andrea, Ciccacci, Franco, Davidson, B. A., Maccherozzi, F., Vobornik, I., and Panaccione, G.

Subjects
Condensed Matter::Materials Science, SPECTROSCOPY, magnetic oxides, x-ray absorption (XAS), thin films, PULSED-LASER DEPOSITION, MIXED-VALENCE MANGANITES, Condensed Matter::Strongly Correlated Electrons, LA0.7SR0.3MNO3, angle-resolved photoemission (ARPES), RESISTIVITY, electronic structure
Abstract

The surface electronic and magnetic properties of epitaxial La2/3Sr1/3MnO3/SrTiO3(001) films with extended bulk metallicity above the Curie temperature have been investigated. By angle-resolved photoemission we show that the surface electronic structure presents the e(g) dispersing band, responsible for the half-metallicity, crossing the Fermi level and leading to a sharp Fermi edge. Quasiparticle excitations, reflecting the coherent polaronic ferromagnetic and metallic ground state, are clearly visible at the Fermi level and 16 K, while they disappear at room temperature, where a Fermi edge is still clearly visible. X-ray magnetic circular dichroism shows a robust subsurface magnetization up to T-C, while spin-polarization Mott spectroscopy indicates a rapid suppression of the surface magnetization which disappears around room temperature. These results clearly demonstrate that a robust surface metallic electronic structure does not necessarily ensure the concomitant stabilization of long-range magnetic order.

Published
2008

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