Convergence des techniques de transmission fibre optique et radio MIMO haut débit PDF Download
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Author: Vincent Dobremez
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
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Book Description
Pour répondre à l'accroissement de la demande en bande passante, de nouveaux réseaux optiques sont mis en place. Ce déploiement s'accompagne de la mise en service de nouveaux standards de fibres optiques, ce qui pose la question de l'utilisation et de la mise en valeur du réseau fibré existant, et notamment des fibres multimodes déjà installées, rapidement vouées à l'obsolescence. On cherche ainsi à mettre à profit la diversité spatiale que procure la nature multimode des ces fibres, via une analogie avec le domaine radiofréquences. L'utilisation des techniques MIMO, largement répandue dans le contexte de transmission radiofréquences, peut constituer une solution à cette amélioration nécessaire de la capacité de transmission de ces fibres optiques multimodes. Ce travail de thèse s'intéresse donc à l'étude et à la transposition des techniques MIMO dans le cadre de transmissions sur fibre optique et aux enjeux et défis associés. La transmission de signaux OFDM via un schéma de transmission SIMO optique permet de démontrer l'intérêt de la transposition des techniques MIMO à l'optique et la faisabilité de tels dispositifs.
Author: Vincent Dobremez
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
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Book Description
Pour répondre à l'accroissement de la demande en bande passante, de nouveaux réseaux optiques sont mis en place. Ce déploiement s'accompagne de la mise en service de nouveaux standards de fibres optiques, ce qui pose la question de l'utilisation et de la mise en valeur du réseau fibré existant, et notamment des fibres multimodes déjà installées, rapidement vouées à l'obsolescence. On cherche ainsi à mettre à profit la diversité spatiale que procure la nature multimode des ces fibres, via une analogie avec le domaine radiofréquences. L'utilisation des techniques MIMO, largement répandue dans le contexte de transmission radiofréquences, peut constituer une solution à cette amélioration nécessaire de la capacité de transmission de ces fibres optiques multimodes. Ce travail de thèse s'intéresse donc à l'étude et à la transposition des techniques MIMO dans le cadre de transmissions sur fibre optique et aux enjeux et défis associés. La transmission de signaux OFDM via un schéma de transmission SIMO optique permet de démontrer l'intérêt de la transposition des techniques MIMO à l'optique et la faisabilité de tels dispositifs.
Author: Institute of Electrical and Electronics Engineers
Publisher:
ISBN:
Category :
Languages : en
Pages : 674
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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.
Author: Michel J.F. Digonnet
Publisher: CRC Press
ISBN: 0824741641
Category : Technology & Engineering
Languages : en
Pages : 956
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Book Description
A discussion of the theories, operating characteristics, and current technology of main fiber laser and amplifier devices based on rare-earth-doped silica and fluorozirconate fibers. It describes the principles, designs, and properties of the erbium-doped fiber amplifier and its role as the cornerstone component in optical communication systems. This second edition contains new and revised material reflecting major developments in academia and industry.
Author: Martin Maier
Publisher: Cambridge University Press
ISBN: 1139504665
Category : Technology & Engineering
Languages : en
Pages : 276
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Book Description
The evolution of broadband access networks toward bimodal fiber-wireless (FiWi) access networks, described in this book, may be viewed as the endgame of broadband access. After discussing the economic impact of broadband access and current worldwide deployment statistics, all the major legacy wireline and wireless broadband access technologies are reviewed. State-of-the-art GPON and EPON fiber access networks are described, including their migration to next-generation systems such as OCDMA and OFDMA PONs. The latest developments of wireless access networks are covered, including VHT WLAN, Gigabit WiMAX, LTE and WMN. The advantages of FiWi access networks are demonstrated by applying powerful network coding, heterogeneous optical and wireless protection, hierarchical frame aggregation, hybrid routing and QoS continuity techniques across the optical-wireless interface. The book is an essential reference for anyone working on optical fiber access networks, wireless access networks or converged FiWi systems.
Author: Mihaela van der Schaar
Publisher: Elsevier
ISBN: 0080474969
Category : Computers
Languages : en
Pages : 713
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Book Description
Multimedia over IP and Wireless Networks is an indispensable guide for professionals or researchers working in areas such as networking, communications, data compression, multimedia processing, streaming architectures, and computer graphics. Beginning with a concise overview of the fundamental principles and challenges of multimedia communication and networking, this book then branches off organically to tackle compression and networking next before moving on to systems, wireless multimedia and more advanced topics. The Compression section advises on the best means and methodology to ensure multimedia signal (images, text, audio and data) integrity for transmissions on wireless and wired systems. The Networking section addresses channel protection and performance. In the Systems section, the focus is on streaming media on demand, live broadcast and video and voice's role in real-time communication. Wireless multimedia transmission and Quality of Service issues are discussed in the Wireless Multimedia section. An Advanced Topics section concludes the book with an assortment of topics including Peer-to-Peer multimedia communication and multipath networks. Up-to-date coverage of existing standards for multimedia networking Synergistic tutorial approach reinforces knowledge gained in previous chapters Balanced treatment of audio and video with coverage of end-to-end systems
Author: Xavier Begaud
Publisher: John Wiley & Sons
ISBN: 1118586573
Category : Technology & Engineering
Languages : en
Pages : 217
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Book Description
Ultra Wide Band Technology (UWB) has reached a level of maturity that allows us to offer wireless links with either high or low data rates. These wireless links are frequently associated with a location capability for which ultimate accuracy varies with the inverse of the frequency bandwidth. Using time or frequency domain waveforms, they are currently the subject of international standards facilitating their commercial implementation. Drawing up a complete state of the art, Ultra Wide Band Antennas is aimed at students, engineers and researchers and presents a summary of internationally recognized studies.
Author: Alain Sibille
Publisher: Academic Press
ISBN: 0123821959
Category : Technology & Engineering
Languages : es
Pages : 385
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Book Description
Foreword from Arogyaswami Paulraj, Professor (Emeritus), Stanford University (USA) - The first book to show how MIMO principles can be implemented in today's mobile broadband networks and components - Explains and solves some of the practical difficulties that arise in designing and implementing MIMO systems - Both theory and implementation sections are written in the context of the most recent standards: IEEE 802.11n (WiFi); IEEE 802.16 (WIMAX); 4G networks (3GPP/3GPP2, LTE)
Author: Eric Brousseau
Publisher: Cambridge University Press
ISBN: 1107013429
Category : Business & Economics
Languages : en
Pages : 463
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Book Description
An interdisciplinary survey of the issues surrounding the governance of the Internet.
Author: Roberto Verdone
Publisher: Springer Science & Business Media
ISBN: 144712314X
Category : Computers
Languages : en
Pages : 696
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Book Description
Reporting the findings of COST 2100, a major European intergovernmental project, this volume offers system designers a good source of guidelines based on channel characterization and measurement-based modeling, as well as worthwhile ideas for future research.
