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Separation Aveugle De Sources Dans Les Systemes De Communication Mimo
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Book Synopsis Séparation aveugle de sources dans les systèmes de communication MIMO by : Aissa Ikhlef
Download or read book Séparation aveugle de sources dans les systèmes de communication MIMO written by Aissa Ikhlef and published by . This book was released on 2008 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cette thèse traite de la séparation aveugle de sources dans les systèmes de communication multi-antennes à l’émission et à la réception MIMO. Nous nous intéressons au cas de signaux sources indépendants traversant un canal MIMO linéaire, instantané ou convolutif, et invariant dans le temps. Au début, nous exposons quelques outils associés à la séparation aveugle de sources. Ensuite nous considérons le cas d’un canal MIMO instantané. Nous commençons par proposer un nouvel algorithme CMA basé sur les rotations de Givens complexes. Nous proposons aussi une extension de la classe des algorithmes à nome constante CNA au cas MIMO, où à partir du critère général nous dérivons trois autres algorithmes. Enfin nous considérons le cas d’un canal MIMO convolutif. Nous proposons un nouvel algorithme permettant de contrôler le retard avec lequel les signaux sources seront récupérés. L’étude des points stationnaires du critère est également proposée.
Book Synopsis Démodulation Aveugle En Interception de Signaux Mimo by : Steredenn DAUMONT
Download or read book Démodulation Aveugle En Interception de Signaux Mimo written by Steredenn DAUMONT and published by Omniscriptum. This book was released on 2018-02-28 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les systèmes MIMO (Multiple Input Multiple Output) ont été proposés par le laboratoire Bell dans les années 90 afin d'augmenter le débit des transmissions. Par la suite, ces systèmes ont été utilisés pour augmenter la fiabilité de la transmission en introduisant de la redondance. L'objectif de cet ouvrage est de proposer des techniques d'estimation, en aveugle, des symboles transmis sur des canaux MIMO. La séparation aveugle de sources, ou BSS pour Blind Source Separation, permet d'estimer les symboles transmis de manière aveugle i.e. sans connaissance du canal de transmission ou de symboles pilotes. Cependant la BSS estime les sources à une rotation et permutation près. D'autres part, les méthodes de BSS utilisant un gradient stochastique sont lentes à converger, ce qui les rend difficilement utilisables sur des canaux variant rapidement dans le temps. Ainsi les axes de recherches sont l'exploitation de la redondance introduite par les codes STBC pour lever des ambiguïtés générées par la BSS, puis l'implémentation de certains critères de manière analytique et enfin l'initialisation d'un filtre de Kalman par la BSS.
Book Synopsis Techniques de démodulation aveugle en interception de signaux MIMO by : Steredenn Daumont
Download or read book Techniques de démodulation aveugle en interception de signaux MIMO written by Steredenn Daumont and published by . This book was released on 2009 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les systèmes MIMO ont été proposés par le laboratoire Bell afin d'augmenter le débit des transmissions. Par la suite ces systèmes ont été utilisés pour augmenter la fiabilité de la transmission en utilisant des codes introduisant de la redondance. Cette thèse CIFRE est menée en collaboration entre la société IPSIS-IT Link et l'équipe SCEE de Supélec membre du laboratoire IETR. L’objectif de cette thèse est de proposer des techniques d’estimation, en aveugle, des symboles transmis sur des canaux MIMO. La séparation aveugle de sources, ou BSS pour Blind Source Separation, permet d'estimer de manière aveugle, i.e. sans connaissance du canal de transmission et de symboles pilotes, les symboles transmis. C'est ce type de méthode que nous utiliserons principalement dans cette thèse. Cependant, la BSS estime les sources à une rotation et permutation près. D’autre part, les méthodes de BSS utilisant un gradient stochastique sont lentes à converger, ce qui les rend difficilement utilisables sur des canaux variant rapidement dans le temps. Ainsi, les axes de recherche exploités durant cette thèse sont : - L'exploitation de la redondance introduite par les codes STBC pour lever les ambiguïtés introduites par la BSS. - L’implémentation de certains critères de manière analytique. Les méthodes analytiques implémentées de manière adaptative convergent rapidement dans le temps, permettant ainsi une utilisation sur des canaux qui varient rapidement dans le temps. - L’initialisation du filtre de Kalman, connu pour ses qualités de poursuite, par la séparation aveugle de sources. Ce type d’association permet de poursuivre des canaux instantanés ou convolutifs variant dans le temps.
Book Synopsis Séparation aveugle de mélanges convolutifs de sources cyclostationnaires by : Elena Florian
Download or read book Séparation aveugle de mélanges convolutifs de sources cyclostationnaires written by Elena Florian and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dans cette thèse, nous nous sommes intéressés aux méthodes de séparation de mélanges convolutifs de signaux cyclostationnaires, et particulièrement de signaux issus de systèmes de communications numériques. Les résultats de ces travaux concernent principalement les méthodes de séparation basées sur la minimisation d'un critère du type CMA avec une approche par déflation. Dans la première partie de ce manuscrit nous nous sommes concentrés sur les mélanges de sources non-circulaires à l'ordre 2, notamment des sources BPSK ou CPM d'indice 1/2. Nous avons montré que dans le cas où les sources ont des caractéristiques différentes (en terme de débit et de résidu de porteuse) la minimisation du critère du module constant couplée avec une approche par déflation permet d'extraire les sources du mélange sans connaître leurs fréquences cycliques ni leurs fréquences cycliques non conjuguées. Dans le cas opposé, où les sources partagent les mêmes fréquences cycliques et les mêmes fréquences cycliques non conjuguées, nous avons prouvé l'existence de minima locaux non-séparants du critère du CMA. Nous avons aussi montré que le critère du CMA converge dans un grand nombre de cas vers ces points et que par conséquent la séparation de sources n'est pas toujours réalisée pour ce type de mélanges. Nous avons ensuite proposé un nouveau critère basé sur le critère du CMA qui, couplé avec une approche par déflation, assure l'extraction des sources dans ces situations. Ce nouveau critère ne nécessite pas la connaissance des fréquences cycliques des signaux mais nécessite quand même la connaissance des fréquences cycliques non-conjuguées les plus significatives. Nous avons proposé une méthode assez grossière d'estimation de ces fréquences et nous avons montré que, avec les fréquences cycliques non-conjuguées significatives ainsi estimées, l'algorithme proposé fonctionne correctement et qu'il est capable d'extraire les sources des mélanges pour lesquels le critère du CMA échoue. Dans la deuxième partie de ce manuscript, nous nous sommes intéressés aux séparateurs dérivés du principe du maximum de vraisemblance. Nous avons d'abord étudié des mélanges instantanés des signaux cyclostationnaires et circulaires à l'ordre 2. Dans ce contexte, nous avons mis en évidence des estimateurs basés sur le principe du maximum de vraisemblance et nous avons présenté une méthode pour les implanter. Nous avons ensuite étudié les propriétés asymptotiques de ces estimateurs et nous avons montré que, dans des conditions idéales (absence du bruit), ces estimateurs permettent d'améliorer les performances du critère du CMA. Toujours dans ces conditions, nous avons montré que les estimateurs dérivés du critère du maximum de vraisemblance permettent dans certains cas d'estimer la source ayant la bande passante la plus petite avec une erreur plus petite que les méthodes usuelles. Ces résultats ne sont malheureusement plus vrais dans un context plus réaliste comme en présence de bruit. Nous avons généralisé les idées développées dans le cas de mélanges instantanés au cas de mélanges convolutifs mais pour ce type de mélanges, nous n'avons pas constaté d'amélioration des performances du critère du CMA même dans le cas non-bruité. Bien qu'en pratique cette étude n'apporte pas de grandes contributions, elle a néanmoins un intérêt théorique certain.
Book Synopsis Blind Speech Separation by : Shoji Makino
Download or read book Blind Speech Separation written by Shoji Makino and published by Springer Science & Business Media. This book was released on 2007-09-07 with total page 439 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the world’s first edited book on independent component analysis (ICA)-based blind source separation (BSS) of convolutive mixtures of speech. This book brings together a small number of leading researchers to provide tutorial-like and in-depth treatment on major ICA-based BSS topics, with the objective of becoming the definitive source for current, comprehensive, authoritative, and yet accessible treatment.
Book Synopsis A Dictionary of Medical Science by : Robley Dunglison
Download or read book A Dictionary of Medical Science written by Robley Dunglison and published by . This book was released on 1857 with total page 998 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Introduction to Global Optimization by : R. Horst
Download or read book Introduction to Global Optimization written by R. Horst and published by Springer Science & Business Media. This book was released on 2000-12-31 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: A textbook for an undergraduate course in mathematical programming for students with a knowledge of elementary real analysis, linear algebra, and classical linear programming (simple techniques). Focuses on the computation and characterization of global optima of nonlinear functions, rather than the locally optimal solutions addressed by most books on optimization. Incorporates the theoretical, algorithmic, and computational advances of the past three decades that help solve globally multi-extreme problems in the mathematical modeling of real world systems. Annotation copyright by Book News, Inc., Portland, OR
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.
Book Synopsis Signal Processing for Wireless Communication Systems by : H. Vincent Poor
Download or read book Signal Processing for Wireless Communication Systems written by H. Vincent Poor and published by Springer Science & Business Media. This book was released on 2006-01-19 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: Signal Processing for Wireless Communication Systems brings together in one place important contributions and up-to-date research results in this fast moving area. The Contributors to this work were selected from leading researchers and practitioners in this field. The book's 18 chapters are divided into three areas: systems, Networks, and Implementation Issues; Channel Estimation and Equalization; and Multiuser Detection. The Work, originally published as Volume 30, Numbers 1-3 of the Journal of VLSI Signal Processing Systems for Signal, Image, and Video Technology, will be valuable to anyone working or researching in the field of wireless communication systems. It serves as an excellent reference, providing insight into some of the most challenging issues being examined today.
Book Synopsis Automatic Modulation Classification by : Zhechen Zhu
Download or read book Automatic Modulation Classification written by Zhechen Zhu and published by John Wiley & Sons. This book was released on 2015-02-16 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: Automatic Modulation Classification (AMC) has been a key technology in many military, security, and civilian telecommunication applications for decades. In military and security applications, modulation often serves as another level of encryption; in modern civilian applications, multiple modulation types can be employed by a signal transmitter to control the data rate and link reliability. This book offers comprehensive documentation of AMC models, algorithms and implementations for successful modulation recognition. It provides an invaluable theoretical and numerical comparison of AMC algorithms, as well as guidance on state-of-the-art classification designs with specific military and civilian applications in mind. Key Features: Provides an important collection of AMC algorithms in five major categories, from likelihood-based classifiers and distribution-test-based classifiers to feature-based classifiers, machine learning assisted classifiers and blind modulation classifiers Lists detailed implementation for each algorithm based on a unified theoretical background and a comprehensive theoretical and numerical performance comparison Gives clear guidance for the design of specific automatic modulation classifiers for different practical applications in both civilian and military communication systems Includes a MATLAB toolbox on a companion website offering the implementation of a selection of methods discussed in the book
Book Synopsis Religion in International Relations by : F. Petito
Download or read book Religion in International Relations written by F. Petito and published by Springer. This book was released on 2003-06-13 with total page 297 pages. Available in PDF, EPUB and Kindle. Book excerpt: Are the secular foundations of international relations sustainable at present? This comprehensive study shows how the global resurgence of religion confronts international relations theory with a theoretical challenge comparable to that raised by the end of the Cold War or the emergence of globalization. The volume tries to shake the secular foundational myths of the discipline and outline the need for an expansion into religiously inspired spheres of thought. It also challenges the most condemning accusation against religion: the view that the politicization of religion is always a threat to security and inimical to the resolution of conflict. Finally, the task of demystifying religion is taken further with an argument for a stronger and "progressive" political engagement of the worldwide religious traditions in the contemporary globalized era.
Book Synopsis Classical and Modern Direction-of-Arrival Estimation by : T. Engin Tuncer
Download or read book Classical and Modern Direction-of-Arrival Estimation written by T. Engin Tuncer and published by Academic Press. This book was released on 2009-07-10 with total page 451 pages. Available in PDF, EPUB and Kindle. Book excerpt: Classical and Modern Direction of Arrival Estimation contains both theory and practice of direction finding by the leading researchers in the field. This unique blend of techniques used in commercial DF systems and state-of-the art super-resolution methods is a valuable source of information for both practicing engineers and researchers. Key topics covered are: - Classical methods of direction finding - Practical DF methods used in commercial systems - Calibration in antenna arrays - Array mapping, fast algorithms and wideband processing - Spatial time-frequency distributions for DOA estimation - DOA estimation in threshold region - Higher order statistics for DOA estimation - Localization in sensor networks and direct position estimation - Brings together in one book classical and modern DOA techniques, showing the connections between them - Contains contributions from the leading people in the field - Gives a concise and easy- to- read introduction to the classical techniques - Evaluates the strengths and weaknesses of key super-resolution techniques - Includes applications to sensor networks
Book Synopsis The Margins of Society in Late Medieval Paris by : Bronislaw Geremek
Download or read book The Margins of Society in Late Medieval Paris written by Bronislaw Geremek and published by Cambridge University Press. This book was released on 2006-04-27 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses the 'marginal' people of late medieval Paris, the large and shifting group of men and women who existed on the margins of conventional organized society. Professor Geremek examines the various groups which made up the marginal world - beggars, prostitutes, procuresses and pimps, petty criminals, casual workers and the unemployed - their haunts in and around Paris, their way of life, and their relation to 'normal' society. Professor Geremek has made with this book a major contribution to the study of late medieval society which illuminates the little-known area of the medieval underworld in a fascinating and very accessible manner. Translated by Jean Birrell from the French edition of 1976, this edition includes a new introduction by Jean-Claude Schmitt, which offers a frank appraisal of the author's life and career to date.
Book Synopsis Ultra Wide Band Antennas by : Xavier Begaud
Download or read book Ultra Wide Band Antennas written by Xavier Begaud and published by John Wiley & Sons. This book was released on 2013-03-04 with total page 217 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultra Wide Band Technology (UWB) has reached a level of maturity that allows us to offer wireless links with either high or low data rates. These wireless links are frequently associated with a location capability for which ultimate accuracy varies with the inverse of the frequency bandwidth. Using time or frequency domain waveforms, they are currently the subject of international standards facilitating their commercial implementation. Drawing up a complete state of the art, Ultra Wide Band Antennas is aimed at students, engineers and researchers and presents a summary of internationally recognized studies.
Book Synopsis Wireless Communications by : H. Vincent Poor
Download or read book Wireless Communications written by H. Vincent Poor and published by Prentice Hall. This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A complete guide to the state-of-the-art in signal processing for wireless communications. Complete coverage is given of data compression, channel coding, modulator/demodulator design, receiver and transmitter design, and antenna design.
Download or read book MIMO written by Alain Sibille and published by Academic Press. This book was released on 2010-12-03 with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt: Foreword from Arogyaswami Paulraj, Professor (Emeritus), Stanford University (USA) - The first book to show how MIMO principles can be implemented in today's mobile broadband networks and components - Explains and solves some of the practical difficulties that arise in designing and implementing MIMO systems - Both theory and implementation sections are written in the context of the most recent standards: IEEE 802.11n (WiFi); IEEE 802.16 (WIMAX); 4G networks (3GPP/3GPP2, LTE)
Book Synopsis Making Stars Physical by : Stephen Case
Download or read book Making Stars Physical written by Stephen Case and published by University of Pittsburgh Press. This book was released on 2018-11-03 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: Making Stars Physical offers the first extensive look at the astronomical career of John Herschel, son of William Herschel and one of the leading scientific figures in Britain throughout much of the nineteenth century. Herschel’s astronomical career is usually relegated to a continuation of his father, William’s, sweeps for nebulae. However, as Stephen Case argues, John Herschel was pivotal in establishing the sidereal revolution his father had begun: a shift of attention from the planetary system to the study of nebulous regions in the heavens and speculations on the nature of the Milky Way and the sun’s position within it. Through John Herschel’s astronomical career—in particular his work on constellation reform, double stars, and variable stars—the study of stellar objects became part of mainstream astronomy. He leveraged his mathematical expertise and his position within the scientific community to make sidereal astronomy accessible even to casual observers, allowing amateurs to make useful observations that could contribute to theories on the nature of stars. With this book, Case shows how Herschel’s work made the stars physical and laid the foundations for modern astrophysics.
