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Etude De Loptimisation Dun Systeme Dmt Adsl
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Book Synopsis Etude de l'optimisation d'un systeme DMT-ADSL. Application a la transmission video MPEG-2 en mode hierarchique by : Marie Zwingelstein
Download or read book Etude de l'optimisation d'un systeme DMT-ADSL. Application a la transmission video MPEG-2 en mode hierarchique written by Marie Zwingelstein and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Etude de l'optimisation d'un système DMT-ADSL by : Marie Colin
Download or read book Etude de l'optimisation d'un système DMT-ADSL written by Marie Colin and published by . This book was released on 1999 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: Le travail présenté dans cette thèse se rapporte au système de transmission numérique ADSL (asymétrique digital suscrite line), dont le principe est d'exploiter les lignes téléphoniques d'abonnés existantes en paire torsadée cuivrée pour assurer une transmission de données à un débit de plusieurs mégabits par seconde. Un des éléments clés de l’ADSL est d'utiliser la modulation multi porteuse DMT (discrète multizone) qui permet d'adapter facilement le signal émis au canal de transmission par le biais du choix des répartitions fréquentielles du débit et de la puissance. Après avoir rappelé comment ces répartitions influencent le TEB (taux d'erreur par bit) atteint, nous développons dans une première partie deux méthodes originales qui optimisent ces répartitions, avec des compromis performance/complexité différents. Pour les deux méthodes, nous proposons un calcul simple de la répartition fréquentielle du débit, optimal au sens de la capacité du canal. En ce qui concerne la puissance, la première méthode, optimale, détermine la répartition qui minimise le TEB, et la seconde, plus simple, celle qui satisfait à l'hypothèse habituelle et légèrement sous-optimale d'un TES (taux d'erreur par symbole) identique sur toutes les fréquences. Les résultats de simulation sur un ensemble de lignes CSA caractéristiques ont montré que les deux méthodes proposées aboutissent à des performances plus élevées que les méthodes courantes, en particulier les méthodes de Hughes-Hartogs et de Peter Chow, avec une complexité de calcul généralement inférieure. Dans la deuxième partie du travail, nous nous intéressons à l'application d'une transmission de données vidéo, codées suivant la norme internationale MPEG-2, sur ADSL. L'originalité repose sur le choix d'un mode de codage et de transmission bi-résolution qui privilégie les données vidéo les plus importantes au détriment des autres données, dans le but d'améliorer la qualité de service. Dans ce cadre, nous avons proposé trois architectures ADSL bi-résolution, agissant soit au niveau de la modulation DMT, soit au niveau du codage FEC (foirard errer correction), en attribuant des codes Reed-Solomon différents aux données importantes et moins importantes. Les résultats ont démontré la validité de tels schémas, avec, compte tenu d'une proportion voisine de 30% pour les données importantes, une réduction du TEB des données importantes d'un facteur 100 par rapport au TEB mono-résolution, alors que le teb des données moins importantes n'est augmente que d'environ un facteur 2.
Book Synopsis OFDM for Optical Communications by : William Shieh
Download or read book OFDM for Optical Communications written by William Shieh and published by Academic Press. This book was released on 2009-09-18 with total page 457 pages. Available in PDF, EPUB and Kindle. Book excerpt: - The first book on optical OFDM by the leading pioneers in the field - The only book to cover error correction codes for optical OFDM - Gives applications of OFDM to free-space communications, optical access networks, and metro and log haul transports show optical OFDM can be implemented - Contains introductions to signal processing for optical engineers and optical communication fundamentals for wireless engineers This book gives a coherent and comprehensive introduction to the fundamentals of OFDM signal processing, with a distinctive focus on its broad range of applications. It evaluates the architecture, design and performance of a number of OFDM variations, discusses coded OFDM, and gives a detailed study of error correction codes for access networks, 100 Gb/s Ethernet and future optical networks. The emerging applications of optical OFDM, including single-mode fiber transmission, multimode fiber transmission, free space optical systems, and optical access networks are examined, with particular attention paid to passive optical networks, radio-over-fiber, WiMAX and UWB communications. Written by two of the leading contributors to the field, this book will be a unique reference for optical communications engineers and scientists. Students, technical managers and telecom executives seeking to understand this new technology for future-generation optical networks will find the book invaluable. William Shieh is an associate professor and reader in the electrical and electronic engineering department, The University of Melbourne, Australia. He received his M.S. degree in electrical engineering and Ph.D. degree in physics both from University of Southern California. Ivan Djordjevic is an Assistant Professor of Electrical and Computer Engineering at the University of Arizona, Tucson, where he directs the Optical Communications Systems Laboratory (OCSL). His current research interests include optical networks, error control coding, constrained coding, coded modulation, turbo equalization, OFDM applications, and quantum error correction. "This wonderful book is the first one to address the rapidly emerging optical OFDM field. Written by two leading researchers in the field, the book is structured to comprehensively cover any optical OFDM aspect one could possibly think of, from the most fundamental to the most specialized. The book adopts a coherent line of presentation, while striking a thoughtful balance between the various topics, gradually developing the optical-physics and communication-theoretic concepts required for deep comprehension of the topic, eventually treating the multiple optical OFDM methods, variations and applications. In my view this book will remain relevant for many years to come, and will be increasingly accessed by graduate students, accomplished researchers as well as telecommunication engineers and managers keen to attain a perspective on the emerging role of OFDM in the evolution of photonic networks." -- Prof. Moshe Nazarathy, EE Dept., Technion, Israel Institute of Technology - The first book on optical OFDM by the leading pioneers in the field - The only book to cover error correction codes for optical OFDM - Applications of OFDM to free-space communications, optical access networks, and metro and log haul transports show optical OFDM can be implemented - An introduction to signal processing for optical communications - An introduction to optical communication fundamentals for the wireless engineer
Book Synopsis Quantum Communications and Cryptography by : Alexander V. Sergienko
Download or read book Quantum Communications and Cryptography written by Alexander V. Sergienko and published by CRC Press. This book was released on 2018-10-03 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: All current methods of secure communication such as public-key cryptography can eventually be broken by faster computing. At the interface of physics and computer science lies a powerful solution for secure communications: quantum cryptography. Because eavesdropping changes the physical nature of the information, users in a quantum exchange can easily detect eavesdroppers. This allows for totally secure random key distribution, a central requirement for use of the one-time pad. Since the one-time pad is theoretically proven to be undecipherable, quantum cryptography is the key to perfect secrecy. Quantum Communications and Cryptography is the first comprehensive review of the past, present, and potential developments in this dynamic field. Leading expert contributors from around the world discuss the scientific foundations, experimental and theoretical developments, and cutting-edge technical and engineering advances in quantum communications and cryptography. The book describes the engineering principles and practical implementations in a real-world metropolitan network as well as physical principles and experimental results of such technologies as entanglement swapping and quantum teleportation. It also offers the first detailed treatment of quantum information processing with continuous variables. Technologies include both free-space and fiber-based communications systems along with the necessary protocols and information processing approaches. Bridging the gap between physics and engineering, Quantum Communications and Cryptography supplies a springboard for further developments and breakthroughs in this rapidly growing area.
Download or read book Arms & Explosives written by and published by . This book was released on 1899 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis State Aid and the Single Market by :
Download or read book State Aid and the Single Market written by and published by . This book was released on 1999 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mobile Broadband written by Mustafa Ergen and published by Springer Science & Business Media. This book was released on 2009-04-05 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book addresses the emerging technology for Orthogonal Frequency Division Multiple Access (OFDMA), covering OFDMA physical layer as well as network technology. The book also includes information on IEEE 802.16e and WiMAX networks and also offers a comparison with other OFDMA technologies. OFDMA is the fastest growing area in the wireless marketplace, and the backbone of systems used in WiMAX. WiMAX is the technology that enables wireless users to communicate at any time from any location without having to find a WiFi hotspot.
Book Synopsis Optical Fiber Telecommunications IV-A by : Ivan Kaminow
Download or read book Optical Fiber Telecommunications IV-A written by Ivan Kaminow and published by Elsevier. This book was released on 2002-05-22 with total page 898 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume IVA is devoted to progress in optical component research and development. Topics include design of optical fiber for a variety of applications, plus new materials for fiber amplifiers, modulators, optical switches, light wave devices, lasers, and high bit-rate electronics. This volume is an excellent companion to Optical Fiber Telecommunications IVB: Systems and Impairments (March 2002, ISBN: 0-12-3951739).- Fourth in a respected and comprehensive series- Authoritative authors from a range of organizations- Suitable for active lightwave R&D designers, developers, purchasers, operators, students, and analysts- Lightwave components reviewed in Volume A-Lightwave systems and impairments reviewed in Volume B- Up-to-the minute coverage
Book Synopsis State Aid to Investment and R & D by : David R. Collie
Download or read book State Aid to Investment and R & D written by David R. Collie and published by . This book was released on 2005 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Digital Audio Broadcasting by : Wolfgang Hoeg
Download or read book Digital Audio Broadcasting written by Wolfgang Hoeg and published by John Wiley & Sons. This book was released on 2004-01-09 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt: Now the standardisation work of DAB (Digital Audio Broadcasting)system is finished many broadcast organisations, network providersand receiver manufacturers in European countries and outside ofEurope (for example Canada and the Far East) will be installing DABbroadcast services as pilot projects or public services. Inaddition some value added services (data and video services) areunder development or have already started as pilot projects. The new digital broadcast system DAB distinguishes itself fromexisting conventional broadcast systems, and the various newinternational standards and related documents (from ITU-R, ISO/IEC,ETSI, EBU, EUREKA147, and others) are not readily available and aredifficult to read for users. Therefore it is essential that a wellstructured technical handbook should be available. The Second Edition of Digital Audio Broadcasting has beenfully updated with new sections and chapters added to reflect allthe latest developments and advances. Digital Audio Broadcasting: Provides a fully updated comprehensive overview of DAB Covers international standards, applications and othertechnical issues Combines the expertise of leading researchers in the field ofDAB Now covers such new areas as: IP-Tunneling via DAB; ElectronicProgramme Guide for DAB; and Metadata A comprehensive overview of DAB specifically written forplanning and system engineers, developers for professional anddomestic equipment manufacturers, service providers, as well aspostgraduate students and lecturers in communicationstechnology.
Book Synopsis Nonlinear Microwave Circuits by : Stephen A. Maas
Download or read book Nonlinear Microwave Circuits written by Stephen A. Maas and published by Wiley-IEEE Press. This book was released on 1997 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt: This classic text is an excellent resource and time-saver for engineers who need to tackle troublesome nonlinear components that remain in use despite recent advances in microwave technology. NONLINEAR MICROWAVE CIRCUITS offers detailed, technically substantial coverage of key methods for the analysis, design, and optimization of nonlinear microwave circuits. Using minimal mathematics, it integrates in-depth, "readable" coverage of the underlying theories that guide these methods. This book is replete with valuable "how to" information on a wide range of topics.
Book Synopsis Multi-Carrier Digital Communications by : Ahmad R.S. Bahai
Download or read book Multi-Carrier Digital Communications written by Ahmad R.S. Bahai and published by Springer Science & Business Media. This book was released on 2006-04-11 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multi-carrier modulation, in particular orthogonal frequency division multiplexing (OFDM), has been successfully applied to a wide variety of digital communications applications for several years. Although OFDM has been chosen as the physical layer standard for a diversity of important systems, the theory, algorithms, and implementation techniques remain subjects of current interest. This book is intended to be a concise summary of the present state of the art of the theory and practice of OFDM technology. This book offers a unified presentation of OFDM theory and high speed and wireless applications. In particular, ADSL, wireless LAN, and digital broadcasting technologies are explained. It is hoped that this book will prove valuable both to developers of such systems, and to researchers and graduate students involved in analysis of digital communications, and will remain a valuable summary of the technology, providing an understanding of new advances as well as the present core technology.
Book Synopsis Trade Policy for Troubled Industries by : Gary Clyde Hufbauer
Download or read book Trade Policy for Troubled Industries written by Gary Clyde Hufbauer and published by Peterson Institute. This book was released on 1986 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An In-Depth Analysis of Rising Household Indebtedness in an Upper Middle by :
Download or read book An In-Depth Analysis of Rising Household Indebtedness in an Upper Middle written by and published by . This book was released on 2016-09-01 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book OFDM and MC-CDMA written by Lajos Hanzo and published by John Wiley & Sons. This book was released on 2007-01-11 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wireless communications has witnessed a tremendous growth during the past decade and further spectacular enabling technology advances are expected in an effort to render ubiquitous wireless connectivity a reality. Currently, a technical in-depth book on this subject is unavailable, which has a similar detailed exposure of OFDM, MIMO-OFDM and MC-CDMA. A further attraction of the joint treatment of these topics is that it allows the reader to view their design trade-offs in a comparative context. Divided into three main parts: Part I provides a detailed exposure of OFDM designed for employment in various applications Part II is another design alternative applicable in the context of OFDM systems where the channel quality fluctuations observed are averaged out with the aid of frequency-domain spreading codes, which leads to the concept of MC-CDMA Part III discusses how to employ multiple antennas at the base station for the sake of supporting multiple users in the uplink By providing an all-encompassing self-contained treatment this volume will appeal to a wide readership, as it is both an easy-reading textbook and a high-level research monograph.
Book Synopsis Automatic Electric Technical Journal by :
Download or read book Automatic Electric Technical Journal written by and published by . This book was released on 1970 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt:
