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Techniques En Appui Des Formats De Modulation Avances Pour Les Futurs Reseaux Optiques
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Book Synopsis Techniques en appui des formats de modulation avancés pour les futurs réseaux optiques by : Siamak Amiralizadeh
Download or read book Techniques en appui des formats de modulation avancés pour les futurs réseaux optiques written by Siamak Amiralizadeh and published by . This book was released on 2016 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les systèmes de communication optique avec des formats de modulation avancés sont actuellement l'un des sujets de recherche les plus importants dans le domaine de communication optique. Cette recherche est stimulée par les exigences pour des débits de transmission de donnée plus élevés. Dans cette thèse, on examinera les techniques efficaces pour la modulation avancée avec une détection cohérente, et multiplexage par répartition en fréquence orthogonale (OFDM) et multiples tonalités discrètes (DMT) pour la détection directe et la détection cohérente afin d'améliorer la performance de réseaux optiques. Dans la première partie, nous examinons la rétropropagation avec filtre numérique (DFBP) comme une simple technique d'atténuation de nonlinéarité d'amplificateur optique semiconducteur (SOA) dans le système de détection cohérente. Pour la première fois, nous démontrons expérimentalement l'efficacité de DFBP pour compenser les nonlinéarités générées par SOA dans un système de détection cohérente porteur unique 16-QAM. Nous comparons la performance de DFBP avec la méthode de Runge-Kutta quatrième ordre. Nous examinons la sensibilité de performance de DFBP par rapport à ses paramètres. Par la suite, nous proposons une nouvelle méthode d'estimation de paramètre pour DFBP. Finalement, nous démontrons la transmission de signaux de 16-QAM aux taux de 22 Gbaud sur 80km de fibre optique avec la technique d'estimation de paramètre proposée pour DFBP. Dans la deuxième partie, nous nous concentrons sur les techniques afin d'améliorer la performance des systèmes OFDM optiques en examinent OFDM optiques cohérente (CO-OFDM) ainsi que OFDM optiques détection directe (DDO-OFDM). Premièrement, nous proposons une combinaison de coupure et prédistorsion pour compenser les distorsions nonlinéaires d'émetteur de CO-OFDM. Nous utilisons une interpolation linéaire par morceaux (PLI) pour charactériser la nonlinéarité d'émetteur. Dans l'émetteur nous utilisons l'inverse de l'estimation de PLI pour compenser les nonlinéarités induites à l'émetteur de CO-OFDM. Deuxièmement, nous concevons des constellations irrégulières optimisées pour les systèmes DDO-OFDM courte distance en considérant deux modèles de bruit de canal. Nous démontrons expérimentalement 100Gb/s+ OFDM/DMT avec la détection directe en utilisant les constellations QAM optimisées. Dans la troisième partie, nous proposons une architecture réseaux optiques passifs (PON) avec DDO-OFDM pour la liaison descendante et CO-OFDM pour la liaison montante. Nous examinons deux scénarios pour l'allocations de fréquence et le format de modulation des signaux. Nous identifions la détérioration limitante principale du PON bidirectionnelle et offrons des solutions pour minimiser ses effets.
Book Synopsis Techniques de pré-distorsion numérique pour l'optimisation des réseaux d'accès optiques by : Mohamad Younes
Download or read book Techniques de pré-distorsion numérique pour l'optimisation des réseaux d'accès optiques written by Mohamad Younes and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: La montée en débit et la flexibilité d'accès sont des enjeux majeurs pour les futurs réseaux de télécommunication. Dans cette perspective, la fibre optique constitue un support de transmission incontournable permettant à ce jour des débits symétriques de l'ordre du Gb/s. La détection cohérente et l'emploi de formats de modulation multi-porteuse ont récemment eu un impact profond dans le domaine des communications optiques et l'une des implémentations les plus remarquables concerne l'OFDM optique cohérent (CO-OFDM). Cependant, l'OFDM présente un facteur de crête important, ce qui constitue un inconvénient notable limitant ses performances, en raison des non-linéarités diverses du canal. Cette thèse a eu pour objectif d'optimiser les performances d'un système de transmission CO-OFDM, en explorant la piste de la pré-distorsion des signaux numériques en bande de base en vue d'une linéarisation de l'émetteur, et principalement de l'amplificateur optique à semi-conducteurs (SOA). Divers algorithmes de pré-distorsion ont été comparés et ont montré leur intérêt au regard du compromis performance - faible complexité paramétrique. Le système de pré-distorsion étant non adaptatif, sa robustesse aux variations de caractéristiques de l'émetteur et du point de fonctionnement de l'amplificateur a été évaluée. L'optimisation d'une structure particulière de pré-distorsion a également été proposée.
Book Synopsis Formats de modulation pour les télécommunications optiques by : Carlos Eduardo Perez Valenzuela
Download or read book Formats de modulation pour les télécommunications optiques written by Carlos Eduardo Perez Valenzuela and published by . This book was released on 2006 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: Après une période de croissance explosive puis de déprime, le marché des réseaux optiques de transmission atteint maintenant une phase de maturité dans laquelle les coûts constitue la contrainte la plus sévère. Aujourd'hui, l'exigence des opérateurs porte plus que jamais sur des systèmes de transmission à la fois performantes, flexibles en capacité, faciles à gérer et surtout à des coûts d'investissement et d'opération très bas. Un des axes de progrès les plus étudiés dans la recherche d'un bon compromis performance-complexité-coût réside dans les formats de modulation en transmission. Jusqu'à maintenant, les systèmes de transmission ont majoritairement utilisé les formats classiques NRZ (Non-return to Zero) et RZ (Return to Zero) jusqu'à des débits de 10 Gbit/s. La transmission sur fibre optique à des débits de 40 Gbit/s et plus doit faire appel à des format de modulation plus évolués. Ce travail de thèse a porté sur la conception d'un nouveau format de modulation optique qui concilie une bonne résistance à l'ensemble des effets de propagation dans la fibre et un impact réduit sur l'architecture des systèmes de transmission. Pour ce faire, une méthode de conception a été développée et une étude détaillée pour différentes configurations génériques de transmission a été menée afin d'établir sa pertinence dans différents domaines d'application.
Book Synopsis Étude Des Potentialités Des Techniques de Modulation Multiporteuse Pour Les Futurs Réseaux D'accès Optique WDM Et TDM PON by : Luiz Anet Neto
Download or read book Étude Des Potentialités Des Techniques de Modulation Multiporteuse Pour Les Futurs Réseaux D'accès Optique WDM Et TDM PON written by Luiz Anet Neto and published by . This book was released on 2012 with total page 255 pages. Available in PDF, EPUB and Kindle. Book excerpt: Despite its success in radio-frequency applications, OFDM has only recently started to draw the attention of the optical community owing principally to the outstanding advancements in electronics and the increasing demands in terms of bit-rates in the last miles of the network. OFDM appears as one possible solution to cost-effectively provide the long-awaited flexibility that lacks on today's somewhat "rigid" passive optical networks (PON). It may also allow their evolution towards higher bit-rates, longer transmission distances and increased number of subscribers per PON tree. Here, we focus on the IMDD approach, which can manage to keep the simplicity and cost-effectiveness at the optical plane by transferring the "hard work" to the digital signal processing domain. We focus this work on two main axes. In the first one, we study the influence of the dispersive IMDD channel frequency response characterized by the interplay between fiber chromatic dispersion and the parasite phase modulation of the light source (chirp) and the ways of optimizing the system's throughput by means of bit and power loading algorithms. Secondly, we evaluate the IMDD OFDM approach under different architectures. Those architectures characterize distinct solutions to share the network ressources between the subscribers, namely time, wavelength and frequency multiplexing.
Book Synopsis Quantum Mechanics, Volume 3 by : Claude Cohen-Tannoudji
Download or read book Quantum Mechanics, Volume 3 written by Claude Cohen-Tannoudji and published by John Wiley & Sons. This book was released on 2019-12-16 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new, third volume of Cohen-Tannoudji's groundbreaking textbook covers advanced topics of quantum mechanics such as uncorrelated and correlated identical particles, the quantum theory of the electromagnetic field, absorption, emission and scattering of photons by atoms, and quantum entanglement. Written in a didactically unrivalled manner, the textbook explains the fundamental concepts in seven chapters which are elaborated in accompanying complements that provide more detailed discussions, examples and applications. * Completing the success story: the third and final volume of the quantum mechanics textbook written by 1997 Nobel laureate Claude Cohen-Tannoudji and his colleagues Bernard Diu and Franck Laloë * As easily comprehensible as possible: all steps of the physical background and its mathematical representation are spelled out explicitly * Comprehensive: in addition to the fundamentals themselves, the books comes with a wealth of elaborately explained examples and applications Claude Cohen-Tannoudji was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris where he also studied and received his PhD in 1962. In 1973 he became Professor of atomic and molecular physics at the Collège des France. His main research interests were optical pumping, quantum optics and atom-photon interactions. In 1997, Claude Cohen-Tannoudji, together with Steven Chu and William D. Phillips, was awarded the Nobel Prize in Physics for his research on laser cooling and trapping of neutral atoms. Bernard Diu was Professor at the Denis Diderot University (Paris VII). He was engaged in research at the Laboratory of Theoretical Physics and High Energy where his focus was on strong interactions physics and statistical mechanics. Franck Laloë was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris. His first assignment was with the University of Paris VI before he was appointed to the CNRS, the French National Research Center. His research was focused on optical pumping, statistical mechanics of quantum gases, musical acoustics and the foundations of quantum mechanics.
Book Synopsis Building Wireless Community Networks by : Rob Flickenger
Download or read book Building Wireless Community Networks written by Rob Flickenger and published by "O'Reilly Media, Inc.". This book was released on 2003 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: Building Wireless Community Networks is about getting people online using wireless network technology. The 802.11b standard (also known as WiFi) makes it possible to network towns, schools, neighborhoods, small business, and almost any kind of organization. All that's required is a willingness to cooperate and share resources. The first edition of this book helped thousands of people engage in community networking activities. At the time, it was impossible to predict how quickly and thoroughly WiFi would penetrate the marketplace. Today, with WiFi-enabled computers almost as common as Ethernet, it makes even more sense to take the next step and network your community using nothing but freely available radio spectrum. This book has showed many people how to make their network available, even from the park bench, how to extend high-speed Internet access into the many areas not served by DSL and cable providers, and how to build working communities and a shared though intangible network. All that's required to create an access point for high-speed Internet connection is a gateway or base station. Once that is set up, any computer with a wireless card can log onto the network and share its resources. Rob Flickenger built such a network in northern California, and continues to participate in network-building efforts. His nuts-and-bolts guide covers: Selecting the appropriate equipment Finding antenna sites, and building and installing antennas Protecting your network from inappropriate access New network monitoring tools and techniques (new) Regulations affecting wireless deployment (new) IP network administration, including DNS and IP Tunneling (new) His expertise, as well as his sense of humor and enthusiasm for the topic, makes Building Wireless Community Networks a very useful and readable book for anyone interested in wireless connectivity.
Download or read book Wireless Hacks written by Rob Flickenger and published by "O'Reilly Media, Inc.". This book was released on 2003 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: Continuing with the successful Hack Series, this title provides real-world working examples of how to make useful things happen with wireless equipment.
Book Synopsis NATO Glossary of Terms and Definitions by : North Atlantic Treaty Organization
Download or read book NATO Glossary of Terms and Definitions written by North Atlantic Treaty Organization and published by CreateSpace. This book was released on 2013-03-08 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: NATO Glossary of terms and definitions (English and French). Listing terms of military significance and their definitions for use in NATO.
Book Synopsis Handbook for Integrating Risk Analysis in the Economic Analysis of Projects by : Asian Development Bank
Download or read book Handbook for Integrating Risk Analysis in the Economic Analysis of Projects written by Asian Development Bank and published by . This book was released on 2002 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aiming to support the development of a framework for the analysis of risk in project design and economic analysis, this handbook outlines technical approaches to modeling risk. Also summarized is the nature and practice of sensitivity analysis in dealing with uncertain outcomes as well as the principles to consider in typical risk analysis situations sector by sector. Case studies are included to demonstrate the application of quantitative risk analysis using actual Asian Development Bank projects to help improve project design and quality. Handbook users will learn to identify factors that are the key determinants of project outcomes, determine the likelihood of an individual project's returns being unacceptable, and design measures to mitigate the risks arising from the identified key factors.
Book Synopsis La traduction de l'anglais au français by : Michel Ballard
Download or read book La traduction de l'anglais au français written by Michel Ballard and published by . This book was released on 2005 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: S'adressant à ceux qui souhaitent s'initier et s'entraîner, de manière raisonnée, à la pratique de la traduction, cet ouvrage offre une méthode d'analyse originale et efficace. La pratique observée est sans cesse présente sous forme d'exemples abondants et variés, les principes dégagés sont illustrés par des exercices. La démarche utilise les différents apports des sciences du langage en les subordonnant à la spécificité de l'acte de traduire. Les termes techniques sont chaque fois clairement définis. L'ordre suivi va du signe à l'énoncé, sans jamais perdre de vue les éléments constituants d'un ensemble qui est le texte. L'ouvrage représente un ensemble cohérent disposé avec ordre mais dont les éléments modulaires sont utilisables séparément, un système de renvois multiples permettant de mettre en perspective les chapitres.
Book Synopsis Translators Through History by : Jean Delisle
Download or read book Translators Through History written by Jean Delisle and published by John Benjamins Publishing. This book was released on 2012 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: Acclaimed, when it first appeared, as a seminal work a groundbreaking book that was both informative and highly readable Translators through History is being released in a new edition, substantially revised and expanded by Judith Woodsworth. Translators have played a key role in intellectual exchange through the ages and across borders. This account of how they have contributed to the development of languages, the emergence of literatures, the dissemination of knowledge and the spread of values tells the story of world culture itself. Content has been updated, new elements introduced and recent directions in translation scholarship incorporated, providing fresh insights and a more nuanced view of past events. The bibliography contains over 100 new titles and illustrations have been refreshed and enhanced. An invaluable tool for students, scholars and professionals in the field of translation, the latest version of Translators through History remains a vital resource for researchers in other disciplines and a fascinating read for the wider public.
Book Synopsis Jean-Baptiste Say and Political Economy by : Jean-Baptiste Say
Download or read book Jean-Baptiste Say and Political Economy written by Jean-Baptiste Say and published by Taylor & Francis. This book was released on 2016-11-10 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: Jean-Baptiste Say (1767–1832) was one of the first great economists to have laid down the foundations of economic science. Author of the famous Treatise on Political Economy in 1803, which was revised and re-edited on several occasions, he published numerous other works including a voluminous Complete Course in Practical Political Economy in 1828–9. He also taught political economy successively from 1815 until his death in three Parisian establishments: the Athénée, the Conservatory of Arts and Trades, and the Collège de France. The texts in which Say exposes his approach to political economy have not been available in the English language until now except for the fourth edition of the ‘Preliminary Discourse’ which serves as an introduction to the Treatise. This book presents a translation which renders his works accessible to the English speaking world. For the first time, English readers will be able to become directly immersed in Say’s principal texts, where he develops his conception of political economy. Jean-Baptiste Say and Political Economy proposes a translation of a selection of eleven of Say’s texts. The first three are versions of the ‘Preliminary Discourse’ from the Treatise’s editions of 1803, 1814 and 1826 with the variations of the editions of 1817, 1819 and 1841. The following four texts are the opening discourses pronounced at the Conservatory in 1820 and 1828 and the Collège de France in 1831 and 1832. The eighth text is the ‘General Considerations’ which open the Complete Course in Practical Political Economy of 1828, with the variations of the 1840 re-edition. The final three texts are those Say devotes to ‘the progress of political economy’ in what is akin to a history of economic thought. This volume is of great importance to economic historians and people studying Jean-Baptiste Say, as well as those who are interested in economic theory and philosophy and political economy.
Author :North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Flight Vehicle Integration Panel. Symposium Publisher : ISBN 13 : Total Pages :402 pages Book Rating :4.E/5 ( download)
Book Synopsis Advances in Rotorcraft Technology by : North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Flight Vehicle Integration Panel. Symposium
Download or read book Advances in Rotorcraft Technology written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Flight Vehicle Integration Panel. Symposium and published by . This book was released on 1997 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis MICHEL SERRES by : Christopher Watkin
Download or read book MICHEL SERRES written by Christopher Watkin and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis NATO Glossary of Abbreviations Used in NATO Documents and Publications by :
Download or read book NATO Glossary of Abbreviations Used in NATO Documents and Publications written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Disappearance of Darkness written by and published by Princeton Architectural Press. This book was released on 2012-11-07 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past decade, photographer Robert Burley has traveled the world documenting the abandonment and destruction of film-based photography, namely, the factories where film was produced and the labs that developed it. Burley's atmospheric large-format photographs transport viewers to rarely seen sites where the alchemy of the photographic process was practiced over the last century-from the Polaroid plant in Waltham, Massachusetts to the Kodak-Pathé plant in Chalon-sur-Saône, France, the birthplace in 1827 of photography itself. As both fine art and documentary, The Disappearance of Darkness is an elegiac reflection on the resilience of traditional art forms in the digital era and a vital commemoration of a century-old industry that seems to have disappeared overnight.
Book Synopsis Season of the Shadow by : Léonora Miano
Download or read book Season of the Shadow written by Léonora Miano and published by . This book was released on 2021-08-15 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: Now in paperback, a brutal and dreamlike story about the first victims of the transatlantic slave trade. This powerful novel presents the early days of the transatlantic slave trade from a new perspective: that of the sub-Saharan population that became its first victims. Cameroonian novelist Léonora Miano presents a world on the brink of disappearing--a pre-colonial civilization with roots that stretch back for centuries. One day, a group of villagers finds twelve of their people missing. Where have they gone? Who is responsible? A collective dream, troubling a group of mothers in a communal dwelling, may have some of the answers, as the women's missing sons call to them in terror; at the same time, a thick shadow settles over the huts, blocking out the light of day. It is the shadow of slavery, which will soon grow to blight the whole world. Miano renders this brutal story in deliberately strange, dreamlike prose, befitting a situation that is, on its face, all but impossible for the villagers to believe.
