Download or read book Identification de Canal Et galisation Aveugles Et Semi aveugles Pour Les Communications Mobiles written by Élisabeth de Carvalho and published by . This book was released on 1999 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Estimation et galisation aveugles de canal pour les communications mobiles written by Jaouhar Ayadi and published by . This book was released on 1999 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: NOUS TRAITONS LE PROBLEME DE L'ESTIMATION ET DE L'EGALISATION AVEUGLES DE CANAL DANS LE CONTEXTE DES COMMUNICATIONS MOBILES. LES METHODES D'IDENTIFICATION QUE NOUS DEVELOPPONS UTILISENT UN MODELE MULTI-CANAL POUR DECRIRE LE CANAL DE TRANSMISSION ENTRE L'EMETTEUR ET LE RECEPTEUR. NOUS COMMENCONS PAR LA DESCRIPTION DES SOUS-ESPACES SIGNAL ET BRUIT CORRESPONDANT A L'ESTIMATION DES PARAMETRES DU CANAL, ET NOUS DISCUTONS DES DIFFERENTES PARAMETRISATIONS DU SOUS-ESPACE BRUIT AINSI QUE LEUR RELATION AVEC L'ENGENDREMENT DE CE DERNIER. NOUS PRESENTONS, ENSUITE, DES METHODES D'ESTIMATION DETERMINISTES QUI INCLUENT LES APPROCHES D'AJUSTEMENT DE SOUS-ESPACES POUR LESQUELLES NOUS PROPOSONS DES TECHNIQUES ALTERNATIVES QUI EVITENT LA DECOMPOSITION PROPRE DE LA MATRICE DE COVARIANCE. UNE AUTRE CLASSE INTERESSANTE DE METHODES DETERMINISTES EST CELLE QUI EST BASEE SUR LE CRITERE DE MAXIMUM DE VRAISEMBLANCE. NOUS PROPOSONS DEUX ALGORITHMES POUR OPTIMISER CE CRITERE. LE PREMIER ALGORITHME PERMET DE DEBRUITER LE CRITERE CONSIDERE ET PAR CONSEQUENT D'OBTENIR DES ESTIMEES SANS BIAIS DU CANAL. POUR CE QUI EST DU DEUXIEME ALGORITHME, IL SE BASE SUR UNE REFORMULATION DE LA FONCTION DE COUT CONSIDEREE COMME UN CRITERE QUADRATIQUE PONDERE DE FACON A CE QUE SON GRADIENT CORRESPONDE EXACTEMENT AU GRADIENT DU CRITERE DE MAXIMUM DE VRAISEMBLANCE. ASYMPTOTIQUEMENT, CES DEUX ALGORITHMES SONT GLOBALEMENT CONVERGENTS ET LEUR CONVERGENCE NECESSITE QUELQUES ITERATIONS. LA PERFORMANCE DU DEUXIEME ALGORITHME RESTE ETROITEMENT PROCHE DE LA BORNE DE CRAMER-RAO. NOUS EXPLOITONS, ENSUITE, LA CONNAISSANCE A PRIORI DES FILTRES DE TRANSMISSION/RECEPTION. NOUS ETENDONS LES METHODES AVEUGLES POUR INCORPORER CETTE CONNAISSANCE ET NOUS CALCULONS LES BORNES DE CRAMER-RAO CORRESPONDANT A CE CAS. NOUS CONSTATONS QUE LES METHODES ETENDUES ABOUTISSENT A DES PERFORMANCES MEILLEURES. EN EFFET, LES BORNES DE PERFORMANCE SONT BEAUCOUP PLUS BASSES QUE CELLES CORRESPONDANT AU CAS PUREMENT AVEUGLE, LES CRITERES A OPTIMISER SONT MIEUX CONDITIONNES ET DES CANAUX QUI NE SONT PAS IDENTIFIABLES PAR DES METHODES AVEUGLES PEUVENT ETRE IDENTIFIES GRACE A L'EXPLOITATION DE CETTE CONNAISSANCE. NOUS PROPOSONS DEUX PROCEDURES ALTERNATIVES POUR PRESERVER LA ROBUSTESSE DES METHODES D'ESTIMATION AVEUGLE EN ABSENCE DE CONNAISSANCE PRECISE SUR LA LONGUEUR DU CANAL. EN FAIT, LA PREMIERE APPROCHE PEUT ETRE VUE COMME UN MECANISME DE DETECTION IMPLICITE DE L'ORDRE DU CANAL, PAR CONTRE LA SECONDE APPROCHE DETECTE CET ORDRE DE FACON EXPLICITE. NOUS DEVELOPPONS UNE METHODE D'AJUSTEMENT DE SOUS-ESPACE POUR IDENTIFIER LE CANAL LORSQUE LE BRUIT ADDITIF N'EST PLUS SUPPOSE BLANC MAIS UNIQUEMENT STATIONNAIRE DE COULEUR INCONNUE. LA METHODE PROPOSEE EXPLOITE UNE STRUCTURE DE DEPLACEMENT DE LA MATRICE DE COVARIANCE DU SIGNAL RECU DANS LAQUELLE LA CONTRIBUTION DU BRUIT DISPARAIT. NOUS ETENDONS, ENSUITE, LA METHODE PROPOSEE POUR EXPLOITER LA CONNAISSANCE A PRIORI DES FILTRES DE TRANSMISSION/RECEPTION AFIN D'AMELIORER SA PERFORMANCE. NOUS PROPOSONS AUSSI UNE METHODE D'ESTIMATION DE CANAL BASEE SUR LE CRITERE D'EGALISATION AVEUGLE DE FORCAGE A ZERO MINIMISANT L'ERREUR QUADRATIQUE MOYENNE. NOUS AVONS PROUVE, DANS CE CONTEXTE, L'EQUIVALENCE ENTRE PLUSIEURS CRITERES D'EGALISATION DANS LE CAS SANS BRUIT ET SOUS LA CONTRAINTE D'ABSENCE DU BIAIS. PAR CONSEQUENT, NOUS AVONS DEDUIT QU'UNE ETAPE DE DEBRUITAGE DE LA MATRICE DE COVARIANCE DU SIGNAL RECU EST NECESSAIRE AVANT SON UTILISATION DANS LA METHODE D'ESTIMATION AVEUGLE. L'AVANTAGE PRINCIPAL DE CETTE METHODE EST QU'ELLE EVITE LA DECOMPOSITION PROPRE DE LA MATRICE DE COVARIANCE TOUT EN ABOUTISSANT A DES PERFORMANCES OPTIMALES PAR RAPPORT A LA BORNE DE CRAMER-RAO.
Download or read book Dictionary of Building and Civil Engineering written by Don Montague and published by Taylor & Francis. This book was released on 1996 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dual-language dictionary lists over 20,000 specialist terms in both French and English, covering architecture, building, engineering and property terms. It meets the needs of all building professionals working on projects overseas. It has been comprehensively researched and compiled to provide an invaluable reference source in an increasingly European marketplace.
Download or read book Dictionary of the French and English Languages written by Gabriel Surenne and published by . This book was released on 1856 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book This Is Not an Atlas written by kollektiv orangotango and published by transcript Verlag. This book was released on 2018-11-30 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Is Not an Atlas gathers more than 40 counter-cartographies from all over the world. This collection shows how maps are created and transformed as a part of political struggle, for critical research or in art and education: from indigenous territories in the Amazon to the anti-eviction movement in San Francisco; from defending commons in Mexico to mapping refugee camps with balloons in Lebanon; from slums in Nairobi to squats in Berlin; from supporting communities in the Philippines to reporting sexual harassment in Cairo. This Is Not an Atlas seeks to inspire, to document the underrepresented, and to be a useful companion when becoming a counter-cartographer yourself.
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.
Download or read book A German English Dictionary for Chemists written by Austin M 1876-1956 Patterson and published by Scholar Select. This book was released on 2015-08-08 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Download or read book A New Pocket Dictionary of the French and English Languages in Two Parts written by Thomas Nugent and published by . This book was released on 1770 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Government at a Glance Southeast Asia 2019 written by OECD and published by OECD Publishing. This book was released on 2019-09-10 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: Government at a Glance Southeast Asia 2019 is the first edition in the Government at a Glance series for the region. It provides the latest available data on public administrations in the 10 ASEAN member countries: Brunei Darussalam, Cambodia, Indonesia, Lao People’s Democratic Republic, Malaysia, Myanmar, the Philippines, Singapore, Thailand and Viet Nam.
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 An Italian Dictionary written by Alfred Hoare and published by . This book was released on 1915 with total page 828 pages. Available in PDF, EPUB and Kindle. Book excerpt: Italian-English. "List of some Italian dictionaries"; "List of philological books treating of or bearing upon Italian etymology": pages xiii. "A concise English-Italian vocabulary": cxxxv page.
Download or read book Toward Peace building written by and published by . This book was released on 1987 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Building Wireless Community Networks written by Rob Flickenger and published by "O'Reilly Media, Inc.". This book was released on 2003 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: Building Wireless Community Networks is about getting people online using wireless network technology. The 802.11b standard (also known as WiFi) makes it possible to network towns, schools, neighborhoods, small business, and almost any kind of organization. All that's required is a willingness to cooperate and share resources. The first edition of this book helped thousands of people engage in community networking activities. At the time, it was impossible to predict how quickly and thoroughly WiFi would penetrate the marketplace. Today, with WiFi-enabled computers almost as common as Ethernet, it makes even more sense to take the next step and network your community using nothing but freely available radio spectrum. This book has showed many people how to make their network available, even from the park bench, how to extend high-speed Internet access into the many areas not served by DSL and cable providers, and how to build working communities and a shared though intangible network. All that's required to create an access point for high-speed Internet connection is a gateway or base station. Once that is set up, any computer with a wireless card can log onto the network and share its resources. Rob Flickenger built such a network in northern California, and continues to participate in network-building efforts. His nuts-and-bolts guide covers: Selecting the appropriate equipment Finding antenna sites, and building and installing antennas Protecting your network from inappropriate access New network monitoring tools and techniques (new) Regulations affecting wireless deployment (new) IP network administration, including DNS and IP Tunneling (new) His expertise, as well as his sense of humor and enthusiasm for the topic, makes Building Wireless Community Networks a very useful and readable book for anyone interested in wireless connectivity.
Download or read book Wireless Hacks written by Rob Flickenger and published by "O'Reilly Media, Inc.". This book was released on 2003 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: Continuing with the successful Hack Series, this title provides real-world working examples of how to make useful things happen with wireless equipment.
Download or read book Egypt s Ruin written by Fedor Aronovich Rotshtein and published by . This book was released on 1910 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Philostratus written by Philostratus (the Athenian) and published by . This book was released on 1912 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
