code division multiple access (155 Ergebnisse)

Zustand: Gut. Zustand: Gut | Seiten: 364 | Sprache: Englisch | Produktart: Bücher.

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Zustand: Sehr gut. Zustand: Sehr gut | Seiten: 143 | Sprache: Englisch | Produktart: Bücher.

Taschenbuch. Zustand: Neu. Neuware -This book covers the basic aspects of Code Division Multiple Access or CDMA. It begins with an introduction to the basic ideas behind fixed and random access systems in order to demonstrate the difference between CDMA and the more widely understood TDMA, FDMA or CSMA. Secondly, a review of basic spread spectrum techniques are presented which are used in CDMA systems including direct sequence, frequency-hopping and time-hopping approaches. The basic concept of CDMA is presented, followed by the four basic principles of CDMA systems that impact their performance: interference averaging, universal frequency reuse, soft handoff, and statistical multiplexing. The focus of the discussion will then shift to applications. The most common application of CDMA currently is cellular systems. A detailed discussion on cellular voice systems based on CDMA, specifically IS-95, is presented. The capacity of such systems will be examined as well as performance enhancement techniques such as coding and spatial filtering. Also discussed are Third Generation CDMA cellular systems and how they differ from Second Generation systems. A second application of CDMA that is covered is spread spectrum packet radio networks. Finally, there is an examination of multi-user detection and interference cancellation and how such techniques impact CDMA networks. This book should be of interest and value to engineers, advanced students, and researchers in communications.Springer Verlag GmbH, Tiergartenstr. 17, 69121 Heidelberg 196 pp. Englisch.

Taschenbuch. Zustand: Neu. Neuware -Free Space Optical (FSO) Communication is the technology in the optical communication system in which the light travelling in free space is used to transmit data wirelessly for computer networking or telecommunication. Several years ago, Optical code division multiple access (OCDMA) systems have proven to be a helpful in combining the flexibility of CDMA technique with unlimited bandwidth of fiber to achieve high speed connectivity with high quality of transmission. It combines the large bandwidth of optical with the flexibility of the CDMA technique to achieve high speed connectivity.Books on Demand GmbH, Überseering 33, 22297 Hamburg 68 pp. Englisch.

Zustand: Hervorragend. Zustand: Hervorragend | Seiten: 400 | Sprache: Englisch | Produktart: Bücher.

Hardcover. Zustand: Bon. Ancien livre de bibliothèque. Traces d'usure sur la couverture. Pages cornées. Edition 2004. Ammareal reverse jusqu'à 15% du prix net de cet article à des organisations caritatives. ENGLISH DESCRIPTION Book Condition: Used, Good. Former library book. Signs of wear on the cover. Dog-eared pages. Edition 2004. Ammareal gives back up to 15% of this item's net price to charity organizations.

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Taschenbuch. Zustand: Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - In communication networks, security is traditionally divided into three categories: integrity, confidentiality and availability. Potentially, optical code-division multiple-access (OCDMA) system may provide both confidentiality and availability protection. Therefore, OCDMA has been seen as a superior candidate to offer confidentiality. However, OCDMA techniques still suffer from inherent security disadvantages, such as eavesdropping by an attacker with specific device to intercept and recover the transmitted signals that has been encoded. In this book, a scheme of signature code reconfiguration over OCDMA network is proposed to enhance multiple-users data transmission security.

Taschenbuch. Zustand: Neu. Neuware -This book focuses on Image Transmission through MC-CDMA Channel in low SNR environment. The whole MC-CDMA system is composed of 5 main components which are the compressor, transmitter model, channel model, receiver model and decompressor. The system involves multi-user image transmission. The original image with PPM or PGM file extension is compressed by using JPEG2000 standards (Wavelet Image Compression). The compressed image is inserted into the digital system and the image data is transmitted through the system. The multi-user image data are received in the output of the receiver. Then this image goes to the decompressor. The multi-user image data are decompressed into an image with PPM or PGM file extension. The reconstructed image for JPEG2000 is compared with the original image by using PSNR and RMSE. The difference between the quality of the original image and the reconstructed image is observed.To examine the quality of the reconstructed images at low SNR MC-CDMA channel, the channel¿s SNR is varied from 10,8,6,5, and finally to 4.At each SNR value, two test images were transmitted and its reconstructed image were compared with original image by using PSNR and RMSE.Books on Demand GmbH, Überseering 33, 22297 Hamburg 172 pp. Englisch.

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paperback. Zustand: New. Pub Date :1996-10 Publisher: People's Posts and Telecommunications Press Summary: CDMA personal communication is one of the most promising communication technology. this book first introduces the principle and method. Book selected by frequency division multiple access. TDMA and CDMA comparison expounded CDMA for the superiority of the wireless access. Book about the key technology of the code division multiple access to the main space: the spreading code synchronization. encoding and spreadi.

Zustand: New. pp. xi + 382.

Hardcover. Zustand: New in new dust jacket. Hardcover, INTERNATIONAL EDITION. ***INTERNATIONAL EDITION*** Read carefully before purchase: This book is the international edition in mint condition with the different ISBN and book cover design, the major content is printed in full English as same as the original North American edition. The book printed in black and white, generally send in twenty-four hours after the order confirmed. All shipments contain tracking numbers. Great professional textbook selling experience and expedite shipping service. 330 p. Audience: Professional and scholarly.

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Taschenbuch. Zustand: Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - This book presents another approach of implementing quality of service (QoS) differentiation in physical layer, particularly the optical domain. Spectral amplitude coding techniques of optical code division multiple access (OCDMA) was used as the means of differentiating signal quality based on bit error rate. This approach is not a complete alternative to the current network layer QoS. However, it is believed that algorithm complexity in the higher layer can be reduced by implementing QoS provisioning at the prescribed bit level. Practical application of the proposed OCDMA codes as the add-drop multiplexer has enabled signal dropping based on different service requirements. There is a thorough explanation which includes mathematical analysis, software simulation and hardware experiment to support the feasibility of implementation of the proposed techniques.

Taschenbuch. Zustand: Neu. Druck auf Anfrage Neuware - Printed after ordering - Code Division Multiple Access (CDMA) has become one of the main candidates for the next generation of mobile land and satellite communication systems. CDMA is based on spread spectrum techniques, which have been used in military applications for over half a century. Only recently, however, has it been recognised that spread spectrum techniques, combined with some additional steps, can provide higher capacity and better flexibility for the mobile cellular radio communications. Code Division Multiple Access Communications comprises a set of contributions from the most distinguished world scientists in the field. These papers review the basic theory and some of the most important problems related to spread spectrum and CDMA. The topics covered centre on the information theory aspects of CDMA; interference suppression and performance analysis. The material presented in this book summarises the main problems in modern CDMA theory and practice and gives a solid starting point for studying this complex and still challenging field. As such Code Division Multiple Access Communications is essential reading for all researchers and designers working in mobile communication systems and provides an excellent text for a course on the subject.

Kartoniert / Broschiert. Zustand: New. Dieser Artikel ist ein Print on Demand Artikel und wird nach Ihrer Bestellung fuer Sie gedruckt. Autor/Autorin: Fathallah HabibAssociate Professor, EE, College of Eng., King Saud University, Saudi Arabia. Adjunct Professor, ECE, Laval University, Canada (2003-09). He pioneered the use of Bragg Gratings for optical CDMA and authored ten paten.

Soft cover. Zustand: New. Language:Chinese.Author:WEI CHU QIAN.Binding:Soft cover.Publisher:Defense Industry Press Pub. Date :2008-01-01.

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Paperback. Zustand: Brand New. 136 pages. 9.00x7.00x0.31 inches. This item is printed on demand.