Download or read book Traitement de signaux par r seau d antennes auto adaptatives written by Yves PICAT and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Traitement de signaux par r seau d antennes autoadaptatives en large bande written by Didier FAYDIT and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book M thodes de traitement d antenne adapt es aux radiocommunications written by Luc Fety and published by . This book was released on 1989 with total page 231 pages. Available in PDF, EPUB and Kindle. Book excerpt: DANS LES SYSTEMES DE RADIOCOMMUNICATION, LA LUTTE CONTRE LE BROUILLAGE EST ASSUREE PAR UNE DISCRIMINATION EN FREQUENCE DES SIGNAUX RECUS PAR L'ANTENNE. AU COURS DE CETTE THESE, L'EMPLOI DE TECHNIQUES DE TRAITEMENT D'ANTENNE EST ENVISAGE COMME MOYEN COMPLEMENTAIRE DE LUTTE CONTRE LE BROUILLAGE. L'ACCENT EST MIS SUR L'ADAPTATION DE L'ANTENNE RESEAU. ON MONTRE QUE SEULES LES METHODES DE TRAITEMENT BASEES SUR LA DISCRIMINATION DES SOURCES A PARTIR DES SIGNAUX QU'ELLES EMETTENT PERMETTENT D'ESPERER DES PERFORMANCES CORRECTES. LES METHODES CLASSIQUES RECHERCHENT CETTE DISCRIMINATION EN METTANT A PROFIT DES INFORMATIONS EXPLICITES (SIGNAL REPLIQUE, ...). EN L'ABSENCE DE TELLES INFORMATIONS, ON PROPOSE DES METHODES ORIGINALES QUI TENTENT DE SEPARER LES SIGNAUX SOURCES EN METTANT A PROFIT CERTAINES DE LEURS PROPRIETES (DECORRELATION, DIFFERENCES SPECTRALES, INDEPENDANCE STATISTIQUE). D'AUTRE PART, LE CAS D'UN CANAL DISPERSIF EST CONSIDERE. DIFFERENTES STRUCTURES DE TRAITEMENT SONT PROPOSEES. LEUR ADAPTATION EST RECHERCHEE GRACE A DES ALGORITHMES DES MOINDRES CARREES RECURSIFS RAPIDES.

Download or read book Colloque de Physique written by and published by . This book was released on 1990 with total page 722 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Journal de Physique written by and published by . This book was released on 1991 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ANTENNE ADAPTATIVE written by JEROME.. GALY and published by . This book was released on 1998 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: EN TRAITEMENT D'ANTENNE, ON UTILISE LES SIGNAUX RECUS SUR UN RESEAU DE CAPTEURS POUR CARACTERISER UN OU PLUSIEURS EMETTEURS OU BRUITEURS (LES SOURCES) PLUS OU MOINS CONNUS. POUR IDENTIFIER CES SOURCES, ON COMBINE LES DIFFERENTES SORTIES DES CAPTEURS OU UN CERTAIN NOMBRE D'ENTRE ELLES, LES DIFFERENTES METHODES DE TRAITEMENT D'ANTENNE PERMETTENT D'EXTRAIRE LE SIGNAL QUI NOUS INTERESSE A PARTIR DU MELANGE DE TOUS LES SIGNAUX PRESENTS. CE TRAVAIL DE RECHERCHE A POUR OBJET D'ETUDIER DES METHODES DE TRAITEMENT D'ANTENNE QUI PERMETTENT DE RESOUDRE LES PROBLEMES DE SEPARATION ET DE LOCALISATION DE SIGNAUX UTILES DANS UN CONTEXTE BRUITE. LA PREMIERE PARTIE SE PREOCCUPE DE LA DEFINITION DU FILTRE SPATIO-TEMPOREL OU SPATIO-FREQUENTIEL AU SENS DU MAXIMUM DE VRAISEMBLANCE. LE FILTRE OBTENU EST COMPARE AU FILTRE QUI MAXIMISE LE RAPPORT SIGNAL A BRUIT OU QUI MINIMISE LA PUISSANCES DES NUISANCES EN SORTIE SOUS LA CONTRAINTE DE NON-DEFORMATION DU SIGNAL. CEPENDANT LORSQU'AUCUNE INFORMATION N'EST DISPONIBLE A PRIORI, ON UTILISE LES STATISTIQUES D'ORDRE SUPERIEUR POUR LA SEPARATION DE SOURCES. L'ALGORITHME JADE UTILISEE POUR LA SEPARATION DE SOURCES BANDE ETROITE EST ETENDU AU CAS DE SIGNAUX LARGE BANDE. DANS LE CONTEXTE DES TELECOMMUNICATIONS, ON UTILISE LA PROPRIETE DE NON-CIRCULARITE DES SIGNAUX BPSK POUR LA SEPARATION ET LA LOCALISATION DES SOURCES. DEUX NOUVEAUX ALGORITHMES SONT PRESENTES : L'ALGORITHME MUSIC ET L'ANALYSE EN CORRELATION CANONIQUE SONT ETENDUS AU CAS DE SIGNAUX NON-CIRCULAIRES. ENFIN, LA DERNIERE PARTIE EST CONSACREE A LA VALIDATION DES DIFFERENTES METHODES. DES ALGORITHMES PAR BLOCS ET ITERATIFS ADAPTABLES AU CONTEXTE DES TELECOMMUNICATIONS SONT TESTES SUR DES SIGNAUX SYNTHETIQUES AINSI QUE SUR DES DONNEES REELLES.

Download or read book CONTRIBUTION A L ETUDE ET A LA REALISATION D UNE ANTENNE ADAPTATIVE FAIBLE COUT A TEMPS DE REPONSE MINIMALE POUR COMMUNICATIONS RADIOMOBILES written by MAGAYE.. DIOP and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: EN TELECOMMUNICATIONS, LA MULTIPLICATION DES LIAISONS RADIO-CIVILES (TELEVISION, TELEPHONIE, ETC...) ACCROIT CONSIDERABLEMENT LA DENSITE DE SOURCES DANS CERTAINES GAMMES DE FREQUENCES (HF, VHF, UHF,...), ALORS QUE LES AUTRES LIAISONS RADIO SONT DE PLUS EN PLUS EXPOSEES AU BROUILLAGE VOLONTAIRE VOIRE INTELLIGENT. LES ANTENNES RESEAUX A TRAITEMENT DU SIGNAL (ANTENNES ADAPTATIVES) CONTRIBUENT A LA REJECTION DES BROUILLEURS EN OPTIMISANT UN CRITERE GENERALEMENT SOUS-OPTIMAL MAIS SIMPLE A MANIPULER. LES TRAVAUX PRESENTES DANS CE MEMOIRE S'INSCRIVENT DANS LE CADRE DE LA FAISABILITE D'UNE ANTENNE ADAPTATIVE FAIBLE COUT DANS LA BANDE UHF POUR COMMUNICATIONS RADIOMOBILES. DANS UN PREMIER TEMPS, LE PROBLEME DE SIMULATION DES SIGNAUX BANDE ETROITE ISSUS DES CAPTEURS A ETE ETUDIE. EN VUE D'UNE IMPLANTATION PRATIQUE, LES PERFORMANCES DE TROIS TECHNIQUES DE TRAITEMENT ADAPTATIF ONT ETE DEVELOPPEES. ENSUITE, DEUX REALISATIONS SATISFAISANT LE CRITERE FAIBLE COUT ONT ETE PROPOSEES. LA PREMIERE EST BASEE SUR LA METHODE D'INVERSION DE PUISSANCE DONT LE CRITERE D'OPTIMISATION VISE A MINIMISER LA PUISSANCE DE SORTIE SOUS UNE CONTRAINTE LINEAIRE, NON DIRECTIONNELLE. ELLE EST INTERESSANTE SI L'INFORMATION SUR LES SIGNAUX CAPTEURS N'EST DISPONIBLE QU'A LA SORTIE DU RESEAU ET CORRESPOND A UN ENVIRONNEMENT PARTICULIER DE SIGNAUX, TYPE SIGNAL UTILE FAIBLE/BROUILLEURS FORTS. LA SECONDE REALISATION CORRESPONDANT A UN RESEAU ADAPTATIF OPTIMAL, PROCEDE A UNE MINIMISATION DE L'ERREUR QUADRATIQUE MOYENNE (EQM) ENTRE UN SIGNAL DE REFERENCE ET LA SORTIE DU RESEAU. POUR GENERER CE TYPE DE SIGNAL, LE RECEPTEUR EXPLOITE LES PROPRIETES DES CODES DE MARKOV INTRODUITS DANS LA MODULATION DU SIGNAL UTILE. UNE MAQUETTE A DEUX ELEMENTS AVEC QUATRE VOIES ADAPTATIVES A ETE CONSTRUITE. ELLE SE PRESENTE SOUS FORME HYBRIDE (ANALOGIQUE ET NUMERIQUE). LES MESURES EXPERIMENTALES SONT PRESENTEES SOUS UNE FORME COMPARATIVE

Download or read book Annales des t l communications written by and published by . This book was released on 1997-07 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings 1995 International Symposium on Nonlinear Theory and Its Applications written by and published by . This book was released on 1995 with total page 678 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modelling the Wireless Propagation Channel written by Fernando P¿rez Font¿n and published by John Wiley & Sons. This book was released on 2008-09-15 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: A practical tool for propagation channel modeling with MATLAB® simulations. Many books on wireless propagation channel provide a highly theoretical coverage, which for some interested readers, may be difficult to follow. This book takes a very practical approach by introducing the theory in each chapter first, and then carrying out simulations showing how exactly put the theory into practice. The resulting plots are analyzed and commented for clarity, and conclusions are drawn and explained from the obtained results. Key features include: A unique approach to propagation channel modeling with accompanying MATLAB® simulations to demonstrate the theory in practice Contains step by step commentary and analysis of the obtained simulation results in order to provide a comprehensive and structured learning tool Covers a wide range of topics including shadowing effects, coverage and interference, Multipath Narrowband channel, Multipath Wideband channel, propagation in micro and pico-cells, the land mobile satellite (LMS) channel, the directional Multipath channel and MIMO and propagation effects in fixed radio links (terrestrial and satellite) The book comes with an accompanying website that contains the MATLAB® simulations and allows readers to try them out themselves Well suited for lab-use, as reference and as a self-learning tool both for advanced students and professionals Modeling the Wireless Propagation Channel: A simulation approach with MATLAB® will be best suited for postgraduate (Masters and PhD) students and practicing engineers in telecommunications and electrical engineering fields, who are seeking to familiarise themselves with the topic without too many formulas. The book will also be of interest to network engineers, system engineers and researchers

Download or read book Earthquake Early Warning Systems written by Paolo Gasparini and published by Springer Science & Business Media. This book was released on 2007-08-10 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book provides information on the major EEW systems in operation and on the state-of-the-art of the different blocks forming an EW system: the rapid detection and estimation of the earthquake’s focal parameters, the signal transmission, the engineering interface and the information reliability/false alarm problem. It is the first time that so many aspects of EEW systems have been specifically focused upon within a single book.

Download or read book Glowworm Swarm Optimization written by Krishnanand N. Kaipa and published by Springer. This book was released on 2017-01-10 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive account of the glowworm swarm optimization (GSO) algorithm, including details of the underlying ideas, theoretical foundations, algorithm development, various applications, and MATLAB programs for the basic GSO algorithm. It also discusses several research problems at different levels of sophistication that can be attempted by interested researchers. The generality of the GSO algorithm is evident in its application to diverse problems ranging from optimization to robotics. Examples include computation of multiple optima, annual crop planning, cooperative exploration, distributed search, multiple source localization, contaminant boundary mapping, wireless sensor networks, clustering, knapsack, numerical integration, solving fixed point equations, solving systems of nonlinear equations, and engineering design optimization. The book is a valuable resource for researchers as well as graduate and undergraduate students in the area of swarm intelligence and computational intelligence and working on these topics.

Download or read book Spherical Near field Antenna Measurements written by Jesper E. Hansen and published by IET. This book was released on 1988 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the aspects of antenna test ranges, data processing schemes and measurement schemes.

Download or read book Gazette Du Bureau Des Brevets written by Canadian Intellectual Property Office. Patent Office and published by . This book was released on with total page 1376 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Gazette Du Bureau Des Brevets written by Canada. Patent Office and published by . This book was released on 1990 with total page 938 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes annual cumulative index of inventors and patentees.

Download or read book Space Systems as Contributors to the NATO Defence Mission written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Mission Systems Panel. Symposium and published by . This book was released on 1997 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The European Landscape Convention written by Michael Jones and published by Springer Science & Business Media. This book was released on 2011-02-09 with total page 327 pages. Available in PDF, EPUB and Kindle. Book excerpt: This important and insightful book provides, for the first time, a broad presentation of ongoing research into public participation in landscape conservation, management and planning, following the 2000 European Landscape Convention which came into force in 2004. The book examines both the theory of participation and what lessons can be learnt from specific European examples. It explores in what manner and to what extent the provisions for participation in the European Landscape Convention have been followed up and implemented. It also presents and compares different experiences of participation in selected countries from northern, southern, eastern and western Europe, and provides a critical examination of public participation in practice. However, while the book’s focus is necessarily on Europe, many of the conclusions drawn are of global relevance. The book provides a valuable reference for researchers and advanced students in landscape policies and management, as well as for professionals and others interested in land-use planning and environmental management.