Systèmes de transmission avec précodage linéaire et traitement itératif

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ISBN 13 :
Total Pages : 134 pages
Book Rating : 4.:/5 (863 download)

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Book Synopsis Systèmes de transmission avec précodage linéaire et traitement itératif by : Jérôme Le Masson

Download or read book Systèmes de transmission avec précodage linéaire et traitement itératif written by Jérôme Le Masson and published by . This book was released on 2005 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cette thèse présente l'étude des systèmes itératifs pour le traitement du précodage linéaire et son application à l'OFDM et aux systèmes à antennes multiples. Le précodage linéaire est une méthode permettant de profiter de la diversité temporelle, fréquentielle ou spatiale du canal. Cependant, le détecteur optimal pour ce type de dispositif a une complexité qui croît de manière exponentielle avec les dimensions du système. Les algorithmes itératifs récemment dérivés du principe ``turbo'' permettent au détecteur de bénéficier d'un information \apriori fournie par un code correcteur d'erreurs. Les principaux détecteurs applicables au précodage linéaire sont ainsi étudiés et une méthode de traitement itératif est adaptée à partir du récepteur MMSE-IC-LE pour la turbo-égalisation. Le traitement proposé ainsi que les autres détecteurs étudiés offrent un gain en diversité potentiellement identique quel que soit le critère de détection choisi, MAP ou MMSE. Les performances théoriques sont déterminées en considérant une information \apriori parfaite en entrée du détecteur. Sur un canal de Rayleigh, l'ordre de diversité est ainsi égal au produit de la diversité du code par la taille de la matrice de précodage. D'autre part, nous observons l'influence du traitement et des paramètres du système sur la convergence à l'aide de diagrammes EXIT. La méthode proposée offre un bon compromis entre performance et complexité, même si le seuil de convergence est retardé lorsque l'efficacité spectrale (modulation, rendement de code) et la taille du précodage linéaire augmentent. Le précodage linéaire avec un traitement itératif en réception est alors appliqué à deux cas réalistes. La modulation multi-porteuses du standard 802.11a est tout d'abord considérée. Dans un contexte de diversité limitée en temps et en fréquence, le précodage linéaire est capable d'apporter un gain significatif avec un traitement de faible complexité Enfin, le précodage linéaire est associé à un système multi-antennes. La forme générale utilisée pour décrire les architectures étudiée permet d'effectuer un traitement itératif conjoint du précodage linéaire et du multiplexage spatial. L'ordre de diversité obtenu précédemment est alors multiplié par le nombre d'antennes de réception. L'étude de la convergence du traitement itératif proposé montre que l'utilisation du précodage linéaire améliore les performances à fort rapport signal à bruit au prix d'une dégradation de la convergence.

Les systèmes de décodage itératif et leurs applications aux modems filaires et non-filaires

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ISBN 13 :
Total Pages : 167 pages
Book Rating : 4.:/5 (49 download)

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Book Synopsis Les systèmes de décodage itératif et leurs applications aux modems filaires et non-filaires by : Frédéric Lehmann

Download or read book Les systèmes de décodage itératif et leurs applications aux modems filaires et non-filaires written by Frédéric Lehmann and published by . This book was released on 2002 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: Récemment, il a été démontré que les systèmes de décodage itératif peuvent fonctionner à des rendements très proches de la limite de Shannon avec toutefois une complexité raisonnable. En particulier, les codes LDPC (" low-density parity-check ") irréguliers et les turbo codes sont des candidats prometteurs pour de futures applications. En premier lieu, la dynamique non-linéaire du décodage itératif est étudiée de manière expérimentale. Celle-ci étant très complexe, un modèle simplifié basé sur les densités de probabilité gaussiennes est proposé pour analyser le décodage itératif. En particulier, nous verrons comment expliquer le seuil de bruit et comment caractériser la dynamique en fonction des paramètres du code. Ensuite, grâce à une analyse théorique, un lien est établi entre les propriétés des codes LDPC et la dynamique du décodage itératif associé. Finalement, les performances des systèmes de décodage itératif sont évaluées pour les applications VDSL et ATM sans fil.

Annales des télécommunications

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ISBN 13 :
Total Pages : 752 pages
Book Rating : 4.:/5 (334 download)

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Book Synopsis Annales des télécommunications by :

Download or read book Annales des télécommunications written by and published by . This book was released on 2005-07 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Neural Networks

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Publisher : Springer Science & Business Media
ISBN 13 : 3540288473
Total Pages : 509 pages
Book Rating : 4.5/5 (42 download)

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Book Synopsis Neural Networks by : Gérard Dreyfus

Download or read book Neural Networks written by Gérard Dreyfus and published by Springer Science & Business Media. This book was released on 2005-11-25 with total page 509 pages. Available in PDF, EPUB and Kindle. Book excerpt: Neural networks represent a powerful data processing technique that has reached maturity and broad application. When clearly understood and appropriately used, they are a mandatory component in the toolbox of any engineer who wants make the best use of the available data, in order to build models, make predictions, mine data, recognize shapes or signals, etc. Ranging from theoretical foundations to real-life applications, this book is intended to provide engineers and researchers with clear methodologies for taking advantage of neural networks in industrial, financial or banking applications, many instances of which are presented in the book. For the benefit of readers wishing to gain deeper knowledge of the topics, the book features appendices that provide theoretical details for greater insight, and algorithmic details for efficient programming and implementation. The chapters have been written by experts and edited to present a coherent and comprehensive, yet not redundant, practically oriented introduction.

Basic Concepts in Information Theory and Coding

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Publisher : Springer Science & Business Media
ISBN 13 : 9780306445446
Total Pages : 444 pages
Book Rating : 4.4/5 (454 download)

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Book Synopsis Basic Concepts in Information Theory and Coding by : Solomon W. Golomb

Download or read book Basic Concepts in Information Theory and Coding written by Solomon W. Golomb and published by Springer Science & Business Media. This book was released on 1994-04-30 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: This highly readable text provides a clear exposition of the implications and interpretations of the fundamentals of discrete information theory and coding. Focusing on the results of practical applications, the authors cover information measures, Shannon's channel capacity/coding theorems, and source and channel coding concepts. The clear, accessible text will serve as an introduction to the field for professionals and students in communication systems, computer science, and electrical systems science.

New Splitting Iterative Methods for Solving Multidimensional Neutron Transport Equations

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Publisher : Universal-Publishers
ISBN 13 : 1599423960
Total Pages : 161 pages
Book Rating : 4.5/5 (994 download)

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Book Synopsis New Splitting Iterative Methods for Solving Multidimensional Neutron Transport Equations by : Jacques Tagoudjeu

Download or read book New Splitting Iterative Methods for Solving Multidimensional Neutron Transport Equations written by Jacques Tagoudjeu and published by Universal-Publishers. This book was released on 2011-04 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis focuses on iterative methods for the treatment of the steady state neutron transport equation in slab geometry, bounded convex domain of Rn (n = 2,3) and in 1-D spherical geometry. We introduce a generic Alternate Direction Implicit (ADI)-like iterative method based on positive definite and m-accretive splitting (PAS) for linear operator equations with operators admitting such splitting. This method converges unconditionally and its SOR acceleration yields convergence results similar to those obtained in presence of finite dimensional systems with matrices possessing the Young property A. The proposed methods are illustrated by a numerical example in which an integro-differential problem of transport theory is considered. In the particular case where the positive definite part of the linear equation operator is self-adjoint, an upper bound for the contraction factor of the iterative method, which depends solely on the spectrum of the self-adjoint part is derived. As such, this method has been successfully applied to the neutron transport equation in slab and 2-D cartesian geometry and in 1-D spherical geometry. The self-adjoint and m-accretive splitting leads to a fixed point problem where the operator is a 2 by 2 matrix of operators. An infinite dimensional adaptation of minimal residual and preconditioned minimal residual algorithms using Gauss-Seidel, symmetric Gauss-Seidel and polynomial preconditioning are then applied to solve the matrix operator equation. Theoretical analysis shows that the methods converge unconditionally and upper bounds of the rate of residual decreasing which depend solely on the spectrum of the self-adjoint part of the operator are derived. The convergence of theses solvers is illustrated numerically on a sample neutron transport problem in 2-D geometry. Various test cases, including pure scattering and optically thick domains are considered.

Design and Modeling of Mechanical Systems

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Publisher : Springer Science & Business Media
ISBN 13 : 3642371434
Total Pages : 653 pages
Book Rating : 4.6/5 (423 download)

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Book Synopsis Design and Modeling of Mechanical Systems by : Mohamed Haddar

Download or read book Design and Modeling of Mechanical Systems written by Mohamed Haddar and published by Springer Science & Business Media. This book was released on 2013-03-12 with total page 653 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 5th International Congress on Design and Modeling of Mechanical Systems (CMSM) was held in Djerba, Tunisia on March 25-27, 2013 and followed four previous successful editions, which brought together international experts in the fields of design and modeling of mechanical systems, thus contributing to the exchange of information and skills and leading to a considerable progress in research among the participating teams. The fifth edition of the congress (CMSM ́2013), organized by the Unit of Mechanics, Modeling and Manufacturing (U2MP) of the National School of Engineers of Sfax, Tunisia, the Mechanical Engineering Laboratory (MBL) of the National School of Engineers of Monastir, Tunisia and the Mechanics Laboratory of Sousse (LMS) of the National School of Engineers of Sousse, Tunisia, saw a significant increase of the international participation. This edition brought together nearly 300 attendees who exposed their work on the following topics: mechatronics and robotics, dynamics of mechanical systems, fluid structure interaction and vibroacoustics, modeling and analysis of materials and structures, design and manufacturing of mechanical systems. This book is the proceedings of CMSM ́2013 and contains a careful selection of high quality contributions, which were exposed during various sessions of the congress. The original articles presented here provide an overview of recent research advancements accomplished in the field mechanical engineering.

Dynamique Non-linéaire Et Le Chaos

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ISBN 13 :
Total Pages : 130 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis Dynamique Non-linéaire Et Le Chaos by :

Download or read book Dynamique Non-linéaire Et Le Chaos written by and published by . This book was released on 1993 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:

AGARD Conference Proceedings

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ISBN 13 :
Total Pages : 466 pages
Book Rating : 4.3/5 (243 download)

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Book Synopsis AGARD Conference Proceedings by : North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development

Download or read book AGARD Conference Proceedings written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development and published by . This book was released on 1976 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Introduction to the Explicit Finite Element Method for Nonlinear Transient Dynamics

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Publisher : John Wiley & Sons
ISBN 13 : 1118382072
Total Pages : 352 pages
Book Rating : 4.1/5 (183 download)

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Book Synopsis Introduction to the Explicit Finite Element Method for Nonlinear Transient Dynamics by : Shen R. Wu

Download or read book Introduction to the Explicit Finite Element Method for Nonlinear Transient Dynamics written by Shen R. Wu and published by John Wiley & Sons. This book was released on 2012-07-30 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: A systematic introduction to the theories and formulations of the explicit finite element method As numerical technology continues to grow and evolve with industrial applications, understanding the explicit finite element method has become increasingly important, particularly in the areas of crashworthiness, metal forming, and impact engineering. Introduction to the Explicit Finite Element Method for Nonlinear Transient Dynamics is the first book to address specifically what is now accepted as the most successful numerical tool for nonlinear transient dynamics. The book aids readers in mastering the explicit finite element method and programming code without requiring extensive background knowledge of the general finite element. The authors present topics relating to the variational principle, numerical procedure, mechanical formulation, and fundamental achievements of the convergence theory. In addition, key topics and techniques are provided in four clearly organized sections: • Fundamentals explores a framework of the explicit finite element method for nonlinear transient dynamics and highlights achievements related to the convergence theory • Element Technology discusses four-node, three-node, eight-node, and two-node element theories • Material Models outlines models of plasticity and other nonlinear materials as well as the mechanics model of ductile damage • Contact and Constraint Conditions covers subjects related to three-dimensional surface contact, with examples solved analytically, as well as discussions on kinematic constraint conditions Throughout the book, vivid figures illustrate the ideas and key features of the explicit finite element method. Examples clearly present results, featuring both theoretical assessments and industrial applications. Introduction to the Explicit Finite Element Method for Nonlinear Transient Dynamics is an ideal book for both engineers who require more theoretical discussions and for theoreticians searching for interesting and challenging research topics. The book also serves as an excellent resource for courses on applied mathematics, applied mechanics, and numerical methods at the graduate level.

Secure Multiparty Computation

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Publisher : Cambridge University Press
ISBN 13 : 1107043050
Total Pages : 385 pages
Book Rating : 4.1/5 (7 download)

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Book Synopsis Secure Multiparty Computation by : Ronald Cramer

Download or read book Secure Multiparty Computation written by Ronald Cramer and published by Cambridge University Press. This book was released on 2015-07-15 with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides information on theoretically secure multiparty computation (MPC) and secret sharing, and the fascinating relationship between the two concepts.

Mechanical Vibrations in Spacecraft Design

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Publisher : Springer Science & Business Media
ISBN 13 : 3662085879
Total Pages : 443 pages
Book Rating : 4.6/5 (62 download)

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Book Synopsis Mechanical Vibrations in Spacecraft Design by : J. Jaap Wijker

Download or read book Mechanical Vibrations in Spacecraft Design written by J. Jaap Wijker and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 443 pages. Available in PDF, EPUB and Kindle. Book excerpt: All typical and special modal and response analysis methods, applied within the frame of the design of spacecraft structures, are described in this book. It therefore addresses graduate students and engineers in the aerospace field.

An Introduction To Plasmonics

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Publisher : World Scientific
ISBN 13 : 1800613415
Total Pages : 356 pages
Book Rating : 4.8/5 (6 download)

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Book Synopsis An Introduction To Plasmonics by : Olivier Pluchery

Download or read book An Introduction To Plasmonics written by Olivier Pluchery and published by World Scientific. This book was released on 2023-08-28 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: What is a plasmon? Is it a particle, like a photon or a wave? Plasmonics stands at the frontier of condensed matter physics, which is the world of electrons, optics and of photons. Plasmonics is one of the most active fields in nanophotonics. This book begins by exploring the concepts behind waves, and the electromagnetic description of light when it interacts with metals; it dedicates every chapter thereafter to all aspects of plasmonics. In particular, the surface plasmon polariton wave is explained in full detail, as well as the localized surface plasmon resonance of metallic nanoparticles. The active research area opened by plasmonics, as well as its applications, are also briefly explained, such as advanced biosensing, subwavelength waveguiding, quantum plasmonics, nanoparticle-based cancer therapies, optical nano-antenna and high-efficiency photovoltaic cells.The book is adapted for graduate students and places a special emphasis on providing complete explanations of the fundamental concepts of plasmonics. Further, each of these concepts is illustrated with examples drawn from the most recent scientific literature. Each chapter ends with a set of exercises that will help the reader revise the concepts and go deeper into the world of plasmonics. More than 70 exercises are included.

Turbo-like Codes

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Publisher : Springer Science & Business Media
ISBN 13 : 1402063911
Total Pages : 94 pages
Book Rating : 4.4/5 (2 download)

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Book Synopsis Turbo-like Codes by : Aliazam Abbasfar

Download or read book Turbo-like Codes written by Aliazam Abbasfar and published by Springer Science & Business Media. This book was released on 2007-09-09 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces turbo error correcting concept in a simple language, including a general theory and the algorithms for decoding turbo-like code. It presents a unified framework for the design and analysis of turbo codes and LDPC codes and their decoding algorithms. A major focus is on high speed turbo decoding, which targets applications with data rates of several hundred million bits per second (Mbps).

bookdown

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Publisher : CRC Press
ISBN 13 : 1351792601
Total Pages : 140 pages
Book Rating : 4.3/5 (517 download)

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Book Synopsis bookdown by : Yihui Xie

Download or read book bookdown written by Yihui Xie and published by CRC Press. This book was released on 2016-12-12 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: bookdown: Authoring Books and Technical Documents with R Markdown presents a much easier way to write books and technical publications than traditional tools such as LaTeX and Word. The bookdown package inherits the simplicity of syntax and flexibility for data analysis from R Markdown, and extends R Markdown for technical writing, so that you can make better use of document elements such as figures, tables, equations, theorems, citations, and references. Similar to LaTeX, you can number and cross-reference these elements with bookdown. Your document can even include live examples so readers can interact with them while reading the book. The book can be rendered to multiple output formats, including LaTeX/PDF, HTML, EPUB, and Word, thus making it easy to put your documents online. The style and theme of these output formats can be customized. We used books and R primarily for examples in this book, but bookdown is not only for books or R. Most features introduced in this book also apply to other types of publications: journal papers, reports, dissertations, course handouts, study notes, and even novels. You do not have to use R, either. Other choices of computing languages include Python, C, C++, SQL, Bash, Stan, JavaScript, and so on, although R is best supported. You can also leave out computing, for example, to write a fiction. This book itself is an example of publishing with bookdown and R Markdown, and its source is fully available on GitHub.

Connections in Steel Structures

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Publisher : CRC Press
ISBN 13 : 1482286424
Total Pages : 415 pages
Book Rating : 4.4/5 (822 download)

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Book Synopsis Connections in Steel Structures by : R. Bjorhovde

Download or read book Connections in Steel Structures written by R. Bjorhovde and published by CRC Press. This book was released on 1988-02-19 with total page 415 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the Proceedings of a State-of-the-Art Workshop on Connenctions and the Behaviour, Strength and Design of Steel Structures held at Laboratoire de Mecanique et Technologie, Ecole Normale, Cachan France from 25th to 27th May 1987. It contains the papers presented at the above proceedings and is split into eight main sections covering: Local Analysis of Joints, Mathematical Models, Classification, Frame Analysis, Frame Stability and Simplified Methods, Design Requirements, Data Base Organisation, Research and Development Needs. With papers from 50 international contributors this text will provide essential reading for all those involved with steel structures.

Instabilités Plastiques

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Publisher :
ISBN 13 :
Total Pages : 358 pages
Book Rating : 4.3/5 (243 download)

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Book Synopsis Instabilités Plastiques by :

Download or read book Instabilités Plastiques written by and published by . This book was released on 1985 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: