ETUDE D'ARCHITECTURE DE RECEPTION A SOUS ECHANTILLONNAGE DESTINEES A DES APPLICATIONS RADIOFREQUENCES PDF Download
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Author: Tony Vasseaux
Publisher:
ISBN:
Category :
Languages : fr
Pages : 180
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Book Description
LES SYSTEMES DE COMMUNICATIONS MODERNES TELS QUE LES TELEPHONES RADIO MOBILES ET LES MESSAGERIES ELECTRONIQUES SONT DEVENUS EN QUELQUES ANNEES DES PRODUITS GRAND PUBLIC. LEUR SUCCES EST EN GRANDE PARTIE DU A LEURS FACILITES D'UTILISATIONS ET AUX NOMBREUX SERVICES QU'ILS OFFRENT. AUJOURD'HUI, ON ESSAIE D'INTEGRER LE MAXIMUM DE FONCTIONS D'UN TELEPHONE RADIO MOBILE DANS DES TECHNOLOGIES CMOS, POUR REDUIRE LES COUTS DE FABRICATION DES SYSTEMES ET DIMINUER LA CONSOMMATION DES CIRCUITS. DE NOMBREUX PROGRES ONT ETE REALISES DANS CE SENS, CEPENDANT L'INTEGRATION TOTALE DE LA PARTIE RECEPTION N'A TOUJOURS PAS ETE REALISEE. C'EST DANS CE CONTEXTE QUE S'INSCRIT CE TRAVAIL DE RECHERCHE. NOUS NOUS SOMMES INTERESSES A UNE ARCHITECTURE INNOVANTE DE RECEPTEURS, QUE L'ON NOMME DANS LA LITTERATURE LE SOFTWARE RADIO (RADIO NUMERIQUE). L'IDEE DANS CE TYPE DE RECEPTEUR EST DE REDUIRE LE PLUS POSSIBLE LE NOMBRE DE CIRCUITS ANALOGIQUES NECESSAIRES. THEORIQUEMENT, CE TYPE DE RECEPTEUR PERMETTRAIT D'OBTENIR UNE PLUS GRANDE INTEGRATION ET UNE CONSOMMATION MOINDRE QUE LES ARCHITECTURES CLASSIQUES. LA DIFFICULTE TECHNIQUE A SURMONTER POUR REALISER CE TYPE DE RECEPTEUR, RESIDE DANS LA REALISATION DE L'ECHANTILLONNEUR BLOQUEUR ET DU CONVERTISSEUR ANALOGIQUE NUMERIQUE QUI DOIVENT ETRE TRES PERFORMANTS A LA FOIS EN RAPIDITE ET EN PRECISION. AU COURS DE CET EXPOSE, NOUS DONNERONS LA TOPOLOGIE ET LE FONCTIONNEMENT D'UN SYSTEME DE RECEPTION FONCTIONNANT SUIVANT CETTE APPLICATION. NOUS PROPOSONS AUSSI UNE METHODE DE CONCEPTION POUR L'ECHANTILLONNEUR BLOQUEUR ET LE CONVERTISSEUR ANALOGIQUE NUMERIQUE. DES MESURES RECUEILLIES A PARTIR D'UN ECHANTILLONNEUR BLOQUEUR EXPERIMENTAL SERONT EGALEMENT DONNEES.
Author: Tony Vasseaux
Publisher:
ISBN:
Category :
Languages : fr
Pages : 180
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Book Description
LES SYSTEMES DE COMMUNICATIONS MODERNES TELS QUE LES TELEPHONES RADIO MOBILES ET LES MESSAGERIES ELECTRONIQUES SONT DEVENUS EN QUELQUES ANNEES DES PRODUITS GRAND PUBLIC. LEUR SUCCES EST EN GRANDE PARTIE DU A LEURS FACILITES D'UTILISATIONS ET AUX NOMBREUX SERVICES QU'ILS OFFRENT. AUJOURD'HUI, ON ESSAIE D'INTEGRER LE MAXIMUM DE FONCTIONS D'UN TELEPHONE RADIO MOBILE DANS DES TECHNOLOGIES CMOS, POUR REDUIRE LES COUTS DE FABRICATION DES SYSTEMES ET DIMINUER LA CONSOMMATION DES CIRCUITS. DE NOMBREUX PROGRES ONT ETE REALISES DANS CE SENS, CEPENDANT L'INTEGRATION TOTALE DE LA PARTIE RECEPTION N'A TOUJOURS PAS ETE REALISEE. C'EST DANS CE CONTEXTE QUE S'INSCRIT CE TRAVAIL DE RECHERCHE. NOUS NOUS SOMMES INTERESSES A UNE ARCHITECTURE INNOVANTE DE RECEPTEURS, QUE L'ON NOMME DANS LA LITTERATURE LE SOFTWARE RADIO (RADIO NUMERIQUE). L'IDEE DANS CE TYPE DE RECEPTEUR EST DE REDUIRE LE PLUS POSSIBLE LE NOMBRE DE CIRCUITS ANALOGIQUES NECESSAIRES. THEORIQUEMENT, CE TYPE DE RECEPTEUR PERMETTRAIT D'OBTENIR UNE PLUS GRANDE INTEGRATION ET UNE CONSOMMATION MOINDRE QUE LES ARCHITECTURES CLASSIQUES. LA DIFFICULTE TECHNIQUE A SURMONTER POUR REALISER CE TYPE DE RECEPTEUR, RESIDE DANS LA REALISATION DE L'ECHANTILLONNEUR BLOQUEUR ET DU CONVERTISSEUR ANALOGIQUE NUMERIQUE QUI DOIVENT ETRE TRES PERFORMANTS A LA FOIS EN RAPIDITE ET EN PRECISION. AU COURS DE CET EXPOSE, NOUS DONNERONS LA TOPOLOGIE ET LE FONCTIONNEMENT D'UN SYSTEME DE RECEPTION FONCTIONNANT SUIVANT CETTE APPLICATION. NOUS PROPOSONS AUSSI UNE METHODE DE CONCEPTION POUR L'ECHANTILLONNEUR BLOQUEUR ET LE CONVERTISSEUR ANALOGIQUE NUMERIQUE. DES MESURES RECUEILLIES A PARTIR D'UN ECHANTILLONNEUR BLOQUEUR EXPERIMENTAL SERONT EGALEMENT DONNEES.
Author: Tony Vasseaux
Publisher:
ISBN:
Category :
Languages : fr
Pages : 180
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Book Description
Author: North Atlantic Treaty Organization
Publisher: CreateSpace
ISBN: 9781482679441
Category : Reference
Languages : en
Pages : 450
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Book Description
NATO Glossary of terms and definitions (English and French). Listing terms of military significance and their definitions for use in NATO.
Author: Agnes Buka
Publisher: World Scientific
ISBN: 1848167997
Category : Science
Languages : en
Pages : 299
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Book Description
The book intends to give a state-of-the-art overview of flexoelectricity, a linear physical coupling between mechanical (orientational) deformations and electric polarization, which is specific to systems with orientational order, such as liquid crystals. Chapters written by experts in the field shed light on theoretical as well as experimental aspects of research carried out since the discovery of flexoelectricity. Besides a common macroscopic (continuum) description the microscopic theory of flexoelectricity is also addressed. Electro-optic effects due to or modified by flexoelectricity as well as various (direct and indirect) measurement methods are discussed. Special emphasis is given to the role of flexoelectricity in pattern-forming instabilities. While the main focus of the book lies in flexoelectricity in nematic liquid crystals, peculiarities of other mesophases (bent-core systems, cholesterics, and smectics) are also reviewed. Flexoelectricity has relevance to biological (living) systems and can also offer possibilities for technical applications. The basics of these two interdisciplinary fields are also summarized.
Author: Xinyuan Wang
Publisher: UCL Press
ISBN: 191063462X
Category : Social Science
Languages : en
Pages : 238
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Book Description
Life outside the mobile phone is unbearable.’ Lily, 19, factory worker. Described as the biggest migration in human history, an estimated 250 million Chinese people have left their villages in recent decades to live and work in urban areas. Xinyuan Wang spent 15 months living among a community of these migrants in a small factory town in southeast China to track their use of social media. It was here she witnessed a second migration taking place: a movement from offline to online. As Wang argues, this is not simply a convenient analogy but represents the convergence of two phenomena as profound and consequential as each other, where the online world now provides a home for the migrant workers who feel otherwise ‘homeless’. Wang’s fascinating study explores the full range of preconceptions commonly held about Chinese people – their relationship with education, with family, with politics, with ‘home’ – and argues why, for this vast population, it is time to reassess what we think we know about contemporary China and the evolving role of social media.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Bas Aarts
Publisher: OUP Oxford
ISBN: 0191079006
Category : Reference
Languages : en
Pages : 464
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Book Description
The Oxford Dictionary of English Grammar is a straightforward and accessible A-Z guide to the diverse and often complex terminology of English grammar. It contains over 1,600 entries with clear and concise definitions, enhanced by numerous example sentences, as well as relevant quotations from the scholarly literature of the field. This second edition is written and edited by Professor Bas Aarts of University College London, writer of the acclaimed Oxford Modern English Grammar. It has been fully revised and updated, with particular attention paid to refreshing the example sentences included within the text. There are over 150 new entries that cover current terminology which has arisen since the publication of the first edition, and there are also new entries on the most important English grammars published since the start of the 20th century. Hundreds of new cross-references enhance the user-friendly nature of the text, and the list of works cited has been thoroughly updated to reflect the current state of the field. A short appendix of web links has been added. All in all, this Dictionary is an invaluable guide to English grammar for all students and teachers of the subject, as well as all those with an informed interest in the English language.
Author:
Publisher:
ISBN:
Category : Arctic regions
Languages : en
Pages : 344
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Book Description
Author: R L Trask
Publisher: Penguin UK
ISBN: 0141991585
Category : Language Arts & Disciplines
Languages : en
Pages : 112
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Book Description
The Penguin Guide to Punctuation is indispensable for anyone who needs to get to grips with using punctuation in their written work. Whether you are puzzled by colons and semicolons, unsure of where commas should go or baffled by apostrophes, this jargon-free, succinct guide is for you.
Author: R.L. Trask
Publisher: Routledge
ISBN: 1134884206
Category : Language Arts & Disciplines
Languages : en
Pages : 348
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Book Description
This dictionary of grammatical terms covers both current and traditional terminology in syntax and morphology. It includes descriptive terms, the major theoretical concepts of the most influential grammatical frameworks, and the chief terms from mathematical and computational linguistics. It contains over 1500 entries, providing definitions and examples, pronunciations, the earliest sources of terms and suggestions for further reading, and recommendations about competing and conflicting usages. The book focuses on non-theory-boumd descriptive terms, which are likely to remain current for some years. Aimed at students and teachers of linguistics, it allows a reader puzzled by a grammatical term to look it up and locate further reading with ease.
