Download or read book Traitements d antenne pour signaux non circulaires et ou non gaussiens written by Audrey Blin and published by . This book was released on 2008 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cette thèse est consacrée à l’exploitation de la non-circularité au second-ordre et de la non-gaussiannité potentielles des signaux bruités en traitement d’antenne. Une partie de cette thèse se déroule dans un contexte d’écoute passive, alors qu’une autre concerne la détection. Pour des observations non-stationnaires, potentiellement non-circulaires (NC) au second ordre, les filtres complexes optimaux au second-ordre sont variants dans le temps (VT) et, sous certaines conditions de non-circularité, linéaires au sens large (LSL). En outre pour des applications telles que le contrôle du spectre ou l’écoute passive, les formes d’onde des sources sont inconnues et aucune séquence d’apprentissage ni code d’étalement ne sont a priori disponibles. C’est dans ce contexte que cette thèse introduit le récepteur à éponse sans distortion et à minimum de variance (ou Minimum variance distortionless response, MVDR) invariant dans le temps (IT) et LSL pour la réception optimale d’un signal inconnu, i.e. dont la forme d’onde est inconnue mais dont le vecteur directeur est connu, ce signal est en outre corrompu par des interférences potentiellement non-circulaires. Un chapitre de la thèse est donc consacré à l’étude des propriétés, performances ainsi qu’à l’implémentation adaptative d’un tel récepteur dans des contextes non-circulaires. Après analyse, il se trouve que, pour des interférences non-circulaires, ce récepteur optimal améliore toujours, en régime stable, les performances du récepteur de Capon pour des interférences non-circulaires. En outre, il est montré que ce récepteur optimal permet de traiter jusqu’à2(N −1) interférences rectilinéaires issues d’un réseau de N capteurs. Finalement, àla fin de ce chapitre, une version qui varie avec le temps, le MVDR LSL VT, est proposée afin de traiter les interférences non-circulaires au second-ordre ayant un résidu de porteuse non-nul ou un offset en fréquence. Pour des observations non-gaussiennes, les filtres optimaux complexes sont non-linéaires. Toujours dans un contexte d’écoute passive, un nouveau chapitre de la thèse introduit un récepteur MVDR de Volterra invariant dans le temps, qui possède une structure de type Global Sidelobe Canceller de Volterra et dont le but est la réception d’un signal inconnu de forme d’onde inconnue mais dont le vecteur directeur est connu, et qui serait corrompu par des interférences potentiellement non-gaussiennes, omniprésentes dans des situations d’intérêt pratique. Les propriétés, performances ainsi que l’implémentation adaptative de ce récepteur en présence d’interférences non-gaussiennes sont analysées dans ce chapitre. Par la suite, il est même montré que ce nouveau récepteur améliore toujours, en régime stable, les performances du célèbre récepteur MVDR de Capon pour des interférences non-gaussiennes. Enfin, une extension dite“complète”prenant en compte à la fois la non-circularité et la non-gaussiannité des interférences est introduite. La détection d’un signal connu, de paramètres (i.e. l’amplitude, la phase, le vecteur directeur) inconnus, perturbé par des interférences inconnues (i.e. statistiques de second ordre inconnues) est un problème qui a reçu beaucoup d’attention ces dernières décennies. Les applications concernées sont les radars, la localisation par satellite ou l’acquisition temporelle en radiocommunications. Toutefois, la plupart des détecteurs actuellement disponible supposent les interférences circulaires au second ordre. Ils deviennent complètement sous-optimaux en présence d’interférences non-circulaires au second-ordre, omniprésentes en pratique. Les rares récepteurs disponibles qui prennent en compte la non-circularité potentielle au second-ordre du bruit total ont été développés sous la condition restrictive que le signal est entièrement connu ou sous l’hypothèse d’un signal aléatoire. Pour cette raison, en suivant une approche de type Test du Rapport de Vraisemblance Généralisé (TRVG), l’objectif de ce dernier chapitre est d’introduire et d’analyser les performances de plusieurs récepteurs pour la détection d’un signal connu, de paramètres inconnus, perturbé par des interférences inconnues et noncirculaires au second-ordre. Afin de simplifier cette étude, cette analyse se limite aux signaux rectilinéaires connus, pour lesquels la représentation en bande de base est réelle. Cette hypothèse n’est pas si restrictive dans la mesure o`u les signaux rectilinéaires, et notamment les signaux binaires, sont couramment utilisés dans un grand nombre d’applications telles que les réseaux de radiocommunications DS-CDMA, les systèmes GPS, certains systèmes d’identification Ami-Ennemi ou certains systèmes radars qui utilisent des signaux codés binairement. Ces différents récepteurs sont associés à différents jeux de paramètres inconnus. Des gains en performance importants par rapport aux détecteurs conventionnels sont mis en évidence.
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
Download or read book Principles of Radar and Sonar Signal Processing written by Chevalier François Le and published by Artech House. This book was released on 2002 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Low Frequency Scattering written by George Dassios and published by Oxford University Press. This book was released on 2000 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scattering theory deals with the interactions of waves with obstacles in their path, and low frequency scattering occurs when the obstacles involved are very small. This book gives an overview of the subject for graduates and researchers, for the first time unifying the theories covering acoustic, electromagnetic and elastic waves.
Download or read book An approach to self written by and published by Gokuldas Bagdi. This book was released on with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: Miss-conception of achieving happiness from worldly objects through wealth, health, prestige and power and being ignorant of vast unfathomable ocean of bliss in Self-realization is the cause of suffering and bondage in the circle of life and death..This eternal truth preached by Upanishads along with four measures—विवेक,वैराग्य,षट् सम्पति -मुमुक्षा-- to be adopted for being eligible for self -realization and thereafter meditating on four Mahavakyas ---अयम् आत्मा ब्रह्म - --अहम ब्रह्मास्मि---तत्त्वमसि –प्रज्ञानम् ब्रह्म—extracted one from each of four Vedas –is the only way to feel eternal Bliss and to be free from bondage of life and death. --- has been explained by me in my two books ---Aatm-chintnam in Hindi and “An Approach to self in English.
Download or read book Signal Processing for Communications written by Paolo Prandoni and published by Collection Savoir suisse. This book was released on 2008-06-17 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: With a novel, less classical approach to the subject, the authors have written a book with the conviction that signal processing should be taught to be fun. The treatment is therefore less focused on the mathematics and more on the conceptual aspects, the idea being to allow the readers to think about the subject at a higher conceptual level, thus building the foundations for more advanced topics. The book remains an engineering text, with the goal of helping students solve real-world problems. In this vein, the last chapter pulls together the individual topics as discussed throughout the book into an in-depth look at the development of an end-to-end communication system, namely, a modem for communicating digital information over an analog channel.
Download or read book Antennas and Propagation for Wireless Communication Systems written by Simon R. Saunders and published by John Wiley & Sons. This book was released on 2007-05-07 with total page 547 pages. Available in PDF, EPUB and Kindle. Book excerpt: Antennas and propagation are of fundamental importance to the coverage, capacity and quality of all wireless communication systems. This book provides a solid grounding in antennas and propagation, covering terrestrial and satellite radio systems in both mobile and fixed contexts. Building on the highly successful first edition, this fully updated text features significant new material and brand new exercises and supplementary materials to support course tutors. A vital source of information for practising and aspiring wireless communication engineers as well as for students at postgraduate and senior undergraduate levels, this book provides a fundamental grounding in the principles of antennas and propagation without excessive recourse to mathematics. It also equips the reader with practical prediction techniques for the design and analysis of a very wide range of common wireless communication systems. Including: Overview of the fundamental electromagnetic principles underlying propagation and antennas. Basic concepts of antennas and their application to specific wireless systems. Propagation measurement, modelling and prediction for fixed links, macrocells, microcells, picocells and megacells Narrowband and wideband channel modelling and the effect of the channel on communication system performance. Methods that overcome and transform channel impairments to enhance performance using diversity, adaptive antennas and equalisers. Key second edition updates: New chapters on Antennas for Mobile Systems and Channel Measurements for Mobile Radio Systems. Coverage of new technologies, including MIMO antenna systems, Ultra Wideband (UWB) and the OFDM technology used in Wi-Fi and WiMax systems. Many new propagation models for macrocells, microcells and picocells. Fully revised and expanded end-of-chapter exercises. The Solutions Manual can be requested from www.wiley.com/go/saunders_antennas_2e
Download or read book Geosimulation written by Itzhak Benenson and published by John Wiley & Sons. This book was released on 2004-08-20 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geosimulation is hailed as ‘the next big thing’ in geographic modelling for urban studies. This book presents readers with an overview of this new and innovative field by introducing the spatial modelling environment and describing the latest research and development using cellular automata and multi-agent systems. Extensive case studies and working code is available from an associated website which demonstrate the technicalities of geosimulation, and provide readers with the tools to carry out their own modelling and testing. The first book to treat urban geosimulation explicitly, integrating socio-economic and environmental modelling approaches Provides the reader with a sound theoretical base in the science of geosimulation as well as applied material on the construction of geosimulation models Cross-references to an author-maintained associated website with downloadable working code for readers to apply the models presented in the book Visit the Author's Website for further information on Geosimulation, Geographic Automata Systems and Geographic Automata Software http://www.geosimulationbook.com
Download or read book Proof Theory and Automated Deduction written by Jean Goubault-Larrecq and published by Springer Science & Business Media. This book was released on 2001-11-30 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interest in computer applications has led to a new attitude to applied logic in which researchers tailor a logic in the same way they define a computer language. In response to this attitude, this text for undergraduate and graduate students discusses major algorithmic methodologies, and tableaux and resolution methods. The authors focus on first-order logic, the use of proof theory, and the computer application of automated searches for proofs of mathematical propositions. Annotation copyrighted by Book News, Inc., Portland, OR
Download or read book Modern Radar Detection Theory written by Antonio De Maio and published by IET. This book was released on 2015-11-25 with total page 395 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern radar detection is the new frontier for advanced radar systems capable of operating in challenging scenarios with a plurality of interference sources, both manmade and natural. Written by top researchers and recognized leaders in the field, this is the first book to provide a comprehensive understanding of the current research trends in modern radar detection. It updates readers with the latest radar signal processing algorithms now capable with high-speed computer chips and sophisticated programs. It also includes examples and applications from real systems. This is essential reading for radar systems design engineers within aerospace companies, military radar engineers, and aerospace contractors/consultants.
Download or read book The Physics of Information Technology written by Neil Gershenfeld and published by Cambridge University Press. This book was released on 2000-10-16 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Physics of Information Technology explores the familiar devices that we use to collect, transform, transmit, and interact with electronic information. Many such devices operate surprisingly close to very many fundamental physical limits. Understanding how such devices work, and how they can (and cannot) be improved, requires deep insight into the character of physical law as well as engineering practice. The book starts with an introduction to units, forces, and the probabilistic foundations of noise and signalling, then progresses through the electromagnetics of wired and wireless communications, and the quantum mechanics of electronic, optical, and magnetic materials, to discussions of mechanisms for computation, storage, sensing, and display. This self-contained volume will help both physical scientists and computer scientists see beyond the conventional division between hardware and software to understand the implications of physical theory for information manipulation.
Download or read book A Short Introduction to Quantum Information and Quantum Computation written by Michel Le Bellac and published by Cambridge University Press. This book was released on 2006-06-15 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum information and computation is a rapidly expanding and cross-disciplinary subject. This book, first published in 2006, gives a self-contained introduction to the field for physicists, mathematicians and computer scientists who want to know more about this exciting subject. After a step-by-step introduction to the quantum bit (qubit) and its main properties, the author presents the necessary background in quantum mechanics. The core of the subject, quantum computation, is illustrated by a detailed treatment of three quantum algorithms: Deutsch, Grover and Shor. The final chapters are devoted to the physical implementation of quantum computers, including the most recent aspects, such as superconducting qubits and quantum dots, and to a short account of quantum information. Written at a level suitable for undergraduates in physical sciences, no previous knowledge of quantum mechanics is assumed, and only elementary notions of physics are required. The book includes many short exercises, with solutions available to instructors through [email protected].
Download or read book Foundations of Signal Processing written by Martin Vetterli and published by Cambridge University Press. This book was released on 2014-09-04 with total page 745 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive and engaging textbook introduces the basic principles and techniques of signal processing, from the fundamental ideas of signals and systems theory to real-world applications. Students are introduced to the powerful foundations of modern signal processing, including the basic geometry of Hilbert space, the mathematics of Fourier transforms, and essentials of sampling, interpolation, approximation and compression The authors discuss real-world issues and hurdles to using these tools, and ways of adapting them to overcome problems of finiteness and localization, the limitations of uncertainty, and computational costs. It includes over 160 homework problems and over 220 worked examples, specifically designed to test and expand students' understanding of the fundamentals of signal processing, and is accompanied by extensive online materials designed to aid learning, including Mathematica® resources and interactive demonstrations.
Download or read book Global Warming and Climate Change written by Emma Carlson Berne and published by Referencepoint Press. This book was released on 2008 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: Throughout the world, the cause and impact of global warming and climate change is being passionately debated. While many claim that a climate crisis is imminent if greenhouse gases are not curbed, others argue that the effects have been overblown. Through objective overviews, primary sources, and full-color illustrations, this title will examine What Is Global Warming and Climate Change? What Are the Consequences of Global Warming? What Are the Controversies Surrounding Global Warming? What Are the Solutions for Global Warming?
Download or read book Logic for Computer Science written by Jean H. Gallier and published by Courier Dover Publications. This book was released on 2015-06-18 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt: This advanced text for undergraduate and graduate students introduces mathematical logic with an emphasis on proof theory and procedures for algorithmic construction of formal proofs. The self-contained treatment is also useful for computer scientists and mathematically inclined readers interested in the formalization of proofs and basics of automatic theorem proving. Topics include propositional logic and its resolution, first-order logic, Gentzen's cut elimination theorem and applications, and Gentzen's sharpened Hauptsatz and Herbrand's theorem. Additional subjects include resolution in first-order logic; SLD-resolution, logic programming, and the foundations of PROLOG; and many-sorted first-order logic. Numerous problems appear throughout the book, and two Appendixes provide practical background information.
Download or read book Advanced Ultrawideband Radar written by James D. Taylor and published by CRC Press. This book was released on 2016-12-19 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the latest theory, developments, and applications related to high resolution materials-penetrating sensor systems. An international team of expert researchers explains the problems and solutions for developing new techniques and applications. Subject areas include ultrawideband (UWB) signals propagation and scattering, materials-penetrating radar techniques for small object detection and imaging, biolocation using holographic techniques, tomography, medical applications, nondestructive testing methods, electronic warfare principles, through-the-wall radar propagation effects, and target identification through measuring the target return signal spectrum changes.
Download or read book Linear Algebra and Its Applications written by David C. Lay and published by . This book was released on 2013-07-29 with total page 800 pages. Available in PDF, EPUB and Kindle. Book excerpt: NOTE: This edition features the same content as the traditional text in a convenient, three-hole-punched, loose-leaf version. Books a la Carte also offer a great value--this format costs significantly less than a new textbook. Before purchasing, check with your instructor or review your course syllabus to ensure that you select the correct ISBN. Several versions of Pearson's MyLab & Mastering products exist for each title, including customized versions for individual schools, and registrations are not transferable. In addition, you may need a CourseID, provided by your instructor, to register for and use Pearson's MyLab & Mastering products. xxxxxxxxxxxxxxx For courses in linear algebra.This package includes MyMathLab(R). With traditional linear algebra texts, the course is relatively easy for students during the early stages as material is presented in a familiar, concrete setting. However, when abstract concepts are introduced, students often hit a wall. Instructors seem to agree that certain concepts (such as linear independence, spanning, subspace, vector space, and linear transformations) are not easily understood and require time to assimilate. These concepts are fundamental to the study of linear algebra, so students' understanding of them is vital to mastering the subject. This text makes these concepts more accessible by introducing them early in a familiar, concrete "Rn" setting, developing them gradually, and returning to them throughout the text so that when they are discussed in the abstract, students are readily able to understand. Personalize learning with MyMathLabMyMathLab is an online homework, tutorial, and assessment program designed to work with this text to engage students and improve results. MyMathLab includes assignable algorithmic exercises, the complete eBook, interactive figures, tools to personalize learning, and more.
