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Author: Hichem Mrabet
Publisher: Editions Universitaires Europeennes
ISBN: 9783841793539
Category :
Languages : fr
Pages : 164
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Book Description
L'objectif de ce travail est d'etudier et d'ameliorer les techniques CDMA optique en termes de codage et de reception, en utilisant des codes optiques a deux dimensions(2-D) dans le contexte d'un reseau LAN optique. D'abord une etude theorique de performance d'un systeme CDMA optique dote de code optique a deux dimensions a ete menee en termes de taux d'erreur binaire et de capacite de multiplexage, au moyen de deux approches, en l'occurrence, l'approche gaussienne et l'approche combinatoire. Ensuite, afin de reduire les interferences d'acces multiples(IAM) et d'atteindre la capacite de multiplexage theorique du systeme CDMA optique etudie en fonction des proprietes du code utilise, nous avons employe un recepteur CDMA optique a annulation d'interference serie(recepteur SIC), tout en minimisant le nombre d'etages d'annulation et en optimisant leurs parametres."
Author: Hichem Mrabet
Publisher: Editions Universitaires Europeennes
ISBN: 9783841793539
Category :
Languages : fr
Pages : 164
Get Book Here
Book Description
L'objectif de ce travail est d'etudier et d'ameliorer les techniques CDMA optique en termes de codage et de reception, en utilisant des codes optiques a deux dimensions(2-D) dans le contexte d'un reseau LAN optique. D'abord une etude theorique de performance d'un systeme CDMA optique dote de code optique a deux dimensions a ete menee en termes de taux d'erreur binaire et de capacite de multiplexage, au moyen de deux approches, en l'occurrence, l'approche gaussienne et l'approche combinatoire. Ensuite, afin de reduire les interferences d'acces multiples(IAM) et d'atteindre la capacite de multiplexage theorique du systeme CDMA optique etudie en fonction des proprietes du code utilise, nous avons employe un recepteur CDMA optique a annulation d'interference serie(recepteur SIC), tout en minimisant le nombre d'etages d'annulation et en optimisant leurs parametres."
Author: Younes Zouine
Publisher:
ISBN:
Category :
Languages : fr
Pages : 170
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Book Description
La technique CDMA (Code Division Multiple Access ou Accès Multiple par Répartition de Codes) est largement utilisée dans le domaine radiofréquence (3G) et suscite un intérêt croissant pour tirer parti de la largeur de bande offerte par la fibre optique. Associée au DWDM (Dense Wavelength Digital Multplexing), cette technique permettrait en effet un accroissement important du nombre d’utilisateurs au niveau local sans accroître les besoins en nombre de fibres du réseau de transport. Elle s’accompagnerait donc d’une diminution évidente du coût du bit/km. Ce type d’étude est gouverné par des contraintes liées au traitement du signal et aux performances des composants. Les recherches rapportées dans ce mémoire consistent en une étude exploratoire par la simulation système des contraintes imposées par les composants et fonctions optoélectroniques qui pourraient répondre aux besoins d’architectures de réseaux locaux optiques basés sur l’application du CDMA. Les limitations dues aux composants des fonctions émission et réception ont été particulièrement étudiées (laser + modulateur, photodiodes, électronique large bande associée,....). De plus, les propriétés de la fibre optique (dispersion, atténuation,....) sont prises en compte dans le cas spécifique des réseaux locaux.
Author: Stéphane Nobilet
Publisher:
ISBN:
Category :
Languages : fr
Pages : 248
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Book Description
Author: The Ceramic Society of Japan
Publisher: Springer Science & Business Media
ISBN: 4431539131
Category : Science
Languages : en
Pages : 507
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Book Description
Advanced Ceramic Technologies & Products describes the development, materials, and manufacturing processes for various ceramic products. The text focuses on the products themselves, and tries to clarify how ceramics have contributed to our lives.
Author: Paul R. Prucnal
Publisher: CRC Press
ISBN: 1420026615
Category : Science
Languages : en
Pages : 402
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Book Description
Code-division multiple access (CDMA) technology has been widely adopted in cell phones. Its astonishing success has led many to evaluate the promise of this technology for optical networks. This field has come to be known as Optical CDMA (OCDMA). Surveying the field from its infancy to the current state, Optical Code Division Multiple Access: Fundamentals and Applications offers the first comprehensive treatment of OCDMA from technology to systems. The book opens with a historical perspective, demonstrating the growth and development of the technologies that would eventually evolve into today's optical networks. Building on this background, the discussion moves to coherent and incoherent optical CDMA coding techniques and performance analysis of these codes in fiber optic transmission systems. Individual chapters provide detailed examinations of fiber Bragg grating (FBG) technology including theory, design, and applications; coherent OCDMA systems; and incoherent OCDMA systems. Turning to implementation, the book includes hybrid multiplexing techniques along with system examples and conversion techniques to connect networks that use different multiplexing platforms, state-of-the-art integration technologies, OCDMA network security issues, and OCDMA network architectures and applications, including a look at possible future directions. Featuring contributions from a team of international experts led by a pioneer in optical technology, Optical Code Division Multiple Access: Fundamentals and Applications places the concepts, techniques, and technologies in clear focus for anyone working to build next-generation optical networks.
Author: Erik Dahlman
Publisher: Academic Press
ISBN: 9780123725332
Category : Technology & Engineering
Languages : en
Pages : 448
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Book Description
This practical book, written by engineers working closely in 3GPP, gives insight into the new technologies adopted by 3GPP, with detailed explanations of the specific solutions chosen and their implementation in HSPA and LTE. The key technologies presented include multi-carrier transmission, advanced single-carrier transmission, advanced receivers, OFDM, MIMO and adaptive antenna solutions, advanced radio resource management and protocols, and different radio network architectures. Their role and use in the context of mobile broadband access in general is explained. Both a high-level overview and more detailed step-by-step explanations of HSPA and LTE implementation are given. An overview of other related systems such as TD SCDMA, CDMA2000, and WIMAX is also provided.This is a ‘must-have’ resource for engineers and other professionals working with cellular or wireless broadband technologies who need to know how to utilize the new technology to stay ahead of the competition. Gives the first explanation of the radio access technologies and key international standards for moving to the next stage of 3G evolution- fully operational mobile broadband Describes the new technologies selected by the 3GPP to realise High Speed Packet Access (HSPA) and Long Term Evolution (LTE) for mobile broadband Gives both higher-level overviews and detailed explanations of HSPA and LTE as specified by 3GPP
Author: Xin-She Yang
Publisher: Springer Nature
ISBN: 9811617813
Category : Technology & Engineering
Languages : en
Pages : 1058
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Book Description
This book gathers selected high-quality research papers presented at the Sixth International Congress on Information and Communication Technology, held at Brunel University, London, on February 25–26, 2021. It discusses emerging topics pertaining to information and communication technology (ICT) for managerial applications, e-governance, e-agriculture, e-education and computing technologies, the Internet of things (IoT) and e-mining. Written by respected experts and researchers working on ICT, the book offers a valuable asset for young researchers involved in advanced studies. The book is presented in four volumes.
Author: Biswanath Mukherjee
Publisher: McGraw-Hill Companies
ISBN:
Category : Computers
Languages : en
Pages : 616
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Book Description
Author: North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Mission Systems Panel. Symposium
Publisher:
ISBN:
Category : Command and control systems
Languages : en
Pages : 202
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Book Description
Author: Alexander V. Sergienko
Publisher: CRC Press
ISBN: 1420026607
Category : Science
Languages : en
Pages : 248
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Book Description
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.
