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Author : Samson Lasaulce
Publisher :
ISBN 13 :
Total Pages : 125 pages
Book Rating : 4.:/5 (469 download)
Download or read book Estimation de Canal Et Détection Multi-utilisateur Pour Les Systèmes TD-CDMA written by Samson Lasaulce and published by . This book was released on 2002 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Piero Castoldi
Publisher : Artech House
ISBN 13 : 1580533302
Total Pages : 235 pages
Book Rating : 4.5/5 (85 download)
Download or read book Multiuser Detection in CDMA Mobile Terminals written by Piero Castoldi and published by Artech House. This book was released on 2002 with total page 235 pages. Available in PDF, EPUB and Kindle. Book excerpt: Here's an authoritative, cutting-edge resource that gives you a thorough understanding of CDMA transmission and detection. It offers practical guidance in designing interference-reducing multi-user receivers for mobile radio systems and multi-user adaptive modems for accessing satellite earth stations. The book provides in-depth descriptions of CDMA principles, and of linear and non-linear multi-user detection , and covers the fine details of the realization of a linear multi-user receiver.
Author : Sergeï Burykh
Publisher :
ISBN 13 :
Total Pages : 153 pages
Book Rating : 4.:/5 (47 download)
Download or read book Multi-user Detection and Blind Channel Estimation for DS-CDMA Systems written by Sergeï Burykh and published by . This book was released on 2003 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Serguei Burykh
Publisher :
ISBN 13 :
Total Pages : 151 pages
Book Rating : 4.:/5 (492 download)
Download or read book Détection multi-utilisateurs et estimation aveugle du canal pour les systèmes CDMA written by Serguei Burykh and published by . This book was released on 2003 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cette thèse est consacrée à la détection multi-utilisateurs et l'estimation aveugle du canal pour les systèmes DS/CDMA. La détection multi-utilisateurs représente un ensemble d'algorithmes de traitement du signal dont le but ets de combattre l'interférence de l'accès multiple et leseffets du canal de propagation. L'estimation du canal en aveugle a pour l'objectif d'identifier le canal de propagation à partir des signaux observés à la sortie du canal en faisant des hypothèses statistiques sur les signaux d'entrée. Dans ce travail, nous proposons un nombre des techniques pour les récepteurs des systèmes DS/CDMA qui peuvent être implémentés en liaison montante mais aussi en liaison descendante. Nos hypothèses de base sont la périodicité des codes d'étalement et la disponibilité du code de l'utilisateur désiré au récepteur. Le premier groupe des algorithmes considérés correspond à celui des détecteurs multi-utilisateurs linéaires. Dans ce groupe, nous nous intéressons aux filtres de Wiener à rang réduit et nous proposons un nouveau filtre de rang réduit CGRRF. Ensuite, nous considérons le détecteur multi-utilisateurs aveugle de Wang & Poor et nous proposons son implémentation adaptative efficace pour la suppression conjointe de MAi et ISI. La partie suivante de travaill est consacrée aux techniques non-linéaires sous-optimales de détection multi-utilisateurs. En particulier, nous proposons le suppresseur d'interférence aveugle (BIC) qui estime les codes et les énergies des interféreurs en aveugle et qui est donc implémentable au niveau du mobile. La dernière partie de la thèse est dédiée à l'estimation du canal en aveugle en présence des résidus de porteuse.
Author : Shahrokh Nayeb Nazar
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (128 download)
Download or read book Blind Channel Estimation and Single-user Detection for Multi-carrier and Spread-spectrum Systems with Transmit Diversity written by Shahrokh Nayeb Nazar and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The application of transmit diversity techniques such as Space-Time Block Coding (STBC) to the downlink of multiuser wireless communications systems has received considerable attention. The main advantage of such an approach is its ability to provide diversity gains through the use of multiple antennas only at the transmitting side without significantly increasing the complexity at the receiving end. Among the many multiple access techniques proposed, Multi-Carrier (MC) and Direct Sequence (DS) Code Division Multiple Access (CDMA) techniques are known as the most promising candidates for future broadband mobile communication networks. In MC and DS-CDMA systems or combination thereof, employing transmit diversity, the spatial diversity gains can only be realized if the underlying channels are accurately acquired at the receiver. Furthermore, such systems suffer from high computational complexity which should be properly addressed for practical implementations. Motivated by these observations, in the first part of this dissertation, we introduce the chip-level ST block coding scheme for DS-CDMA systems. For this scheme, we address the problems of single-user detection as well as blind channel estimation, and we show that chip-level coding does not suffer from antenna order ambiguity. Moreover, we demonstrate that chip-level schemes exhibit low decoding delay and allow for the design of adaptive single-user detectors with improved short data-record performance characteristics compared to their symbol-level counterparts. In the second part of this dissertation, we present a novel transmission scheme for the downlink of MC-CDMA systems with transmit diversity that is based on chip-level Space-Frequency (SF) block coding. For this scheme, we investigate the problem of blind channel estimation when the received signal processing is done (i) pre-Fast Fourier Transform (FFT); and (ii) post-FFT. We propose two blind channel estimation algorithms based on subspace and Minimum Variance Distortionless Response (MVDR) principles. Moreover, we present an analytical performance analysis of the proposed algorithms by investigating the bias as well as the finite data record mean-square error of the channel estimates. Our analysis shows that SFBC MC-CDMA systems do not suffer from antenna order ambiguity. In addition, to benchmark the accuracy of our estimation algorithms, we derive the corresponding Cramer-Rao bounds (CRB) based on a novel approach that assumes the knowledge of only the spreading code of the desired user. Our approach has the advantage of providing lower bounds which are tighter than the CRBs with known signatures. We also study the problem of single user detection for downlink transmissions to address the issue of multiuser interference. In the case of the post-FFT approach, we take advantage of the SFBC-induced signal structure to derive linear single-user detectors with improved performance in short data-record situations. Finally, in order to address the issue of computational complexity, we exploit the structure of the covariance matrix of the received signal to simplify the computations involved in estimating the channel, and forming the detector."--
Author : Hui Cheng
Publisher :
ISBN 13 : 9781361084854
Total Pages : pages
Book Rating : 4.0/5 (848 download)
Download or read book New Channel Estimation and Multiuser Detection Algorithms for Multicarrier(mc)-Cdma Communications Systems written by Hui Cheng and published by . This book was released on 2017-01-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "New Channel Estimation and Multiuser Detection Algorithms for Multicarrier(MC)-CDMA Communications Systems" by Hui, Cheng, 成慧, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of the thesis entitled New Channel Estimation and Multiuser Detection Algorithms For Multicarrier (MC)-CDMA Communications Systems submitted by Cheng Hui for the degree of Doctor of Philosophy at the University of Hong Kong in September 2005 Multicarrier code division multiple access (MC-CDMA) has been recently proposed as an efficient multicarrier transmission scheme for supporting multiple access communications. However, MC-CDMA is an interference-limited system, which is rather sensitive to multiple access interference (MAI). Multiuser detection techniques are critical to mitigate MAI. Meanwhile, channel estimation is essential to the coherent detection of MC-CDMA signals. This thesis is dedicated to new channel estimation and multiuser detection algorithms for wireless MC-CDMA systems. New blind constrained minimum output energy (CMOE)-based and subspace-based multiuser detection and channel estimation algorithms are first developed. In particular, a new blind CMOE receiver is proposed. The proposed CMOE receiver is based on recursive least square (RLS) updating, and it minimizes the receiver''s output energy while preserving the components of the desired signal. iiiBy imposing quadratic weight constraint, the CMOE detector is made more robust against the channel and correlation matrix estimation errors, and a better performance over the standard CMOE detector is obtained. The steady-state signal-to-interference-plus-noise ratio (SINR) performance of the blind adaptive CMOE and training adaptive minimum mean squared-error (MMSE) detectors is also analyzed. A blind mode decision-directed MMSE detector is then proposed to further improve the performance of the blind CMOE receivers. Simulation results show that the blind mode decision-directed MMSE detector substantially improves the system performance when the frequency-selective channel is slowly varying. Blind and group-blind subspace-based MMSE multiuser detectors are also developed, where the channel coefficients can be blindly estimated. The proposed group-blind multiuser detector considerably outperforms the blind subspace-based method in uplink MC-CDMA channels. It exploits the spreading codes of a group of known users within the cell, while suppressing the unknown interferers from other cells using the MMSE principle. The adaptive implementation of the blind and group-blind multiuser detectors is also studied based on signal and noise subspace tracking algorithms. Numerical simulations show that the convergence of the projection approximation subspace tracking with deflation (PASTd) algorithm is quite slow, while the more complicated bi-iteration square-root singular value decomposition (Bi-SVD) signal subspace tracker presents performance close to the solution with exact singular value decomposition (SVD). MC-CDMA systems are sensitive to narrowband interference (NBI). A new robust channel estimator and a robust multiuser detector are developed to combat time-varying NBI. In particular, an efficient weighted recursive least M-estimate (WRLM) algorithm is proposed to recursively estimate the frequency-selective ivfading channel while providing improved robustness to the time-varying NBI. Furthermore, a weighted least M-estimate (WLM) detector is developed to jointly suppress MAI and time-varying NBI. Simulations show that the proposed robust channel estimator and multiuser d
Author :
Publisher :
ISBN 13 :
Total Pages : 622 pages
Book Rating : 4.:/5 (334 download)
Download or read book Annales des télécommunications written by and published by . This book was released on 1999 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Yanrong Zhang
Publisher :
ISBN 13 :
Total Pages : 109 pages
Book Rating : 4.:/5 (546 download)
Download or read book Channel Estimation and Multiuser Detection for CDMA Wireless Communication System written by Yanrong Zhang and published by . This book was released on 2001 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Lei Huang
Publisher :
ISBN 13 :
Total Pages : 256 pages
Book Rating : 4.:/5 (224 download)
Download or read book Blind Channel Estimation and Multiuser Detection for Multi-rate CDMA Communications written by Lei Huang and published by . This book was released on 2003 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Multiuser Detection and Channel Estimation for Synchronous CDMA Systems written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Yong Soo Cho
Publisher : John Wiley & Sons
ISBN 13 : 0470825626
Total Pages : 458 pages
Book Rating : 4.4/5 (78 download)
Download or read book MIMO-OFDM Wireless Communications with MATLAB written by Yong Soo Cho and published by John Wiley & Sons. This book was released on 2010-08-20 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt: MIMO-OFDM is a key technology for next-generation cellular communications (3GPP-LTE, Mobile WiMAX, IMT-Advanced) as well as wireless LAN (IEEE 802.11a, IEEE 802.11n), wireless PAN (MB-OFDM), and broadcasting (DAB, DVB, DMB). In MIMO-OFDM Wireless Communications with MATLAB®, the authors provide a comprehensive introduction to the theory and practice of wireless channel modeling, OFDM, and MIMO, using MATLAB® programs to simulate the various techniques on MIMO-OFDM systems. One of the only books in the area dedicated to explaining simulation aspects Covers implementation to help cement the key concepts Uses materials that have been classroom-tested in numerous universities Provides the analytic solutions and practical examples with downloadable MATLAB® codes Simulation examples based on actual industry and research projects Presentation slides with key equations and figures for instructor use MIMO-OFDM Wireless Communications with MATLAB® is a key text for graduate students in wireless communications. Professionals and technicians in wireless communication fields, graduate students in signal processing, as well as senior undergraduates majoring in wireless communications will find this book a practical introduction to the MIMO-OFDM techniques. Instructor materials and MATLAB® code examples available for download at www.wiley.com/go/chomimo
Author : H. Vincent Poor
Publisher : Springer Science & Business Media
ISBN 13 : 0306473224
Total Pages : 299 pages
Book Rating : 4.3/5 (64 download)
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.
Author :
Publisher :
ISBN 13 :
Total Pages : 264 pages
Book Rating : 4.3/5 (21 download)
Download or read book Guide to Best Practices for Ocean Acidification Research and Data Reporting written by and published by . This book was released on 2011 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sabu M. Thampi
Publisher : Springer Nature
ISBN 13 : 9811548285
Total Pages : 414 pages
Book Rating : 4.8/5 (115 download)
Download or read book Advances in Signal Processing and Intelligent Recognition Systems written by Sabu M. Thampi and published by Springer Nature. This book was released on 2020-04-30 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceedings of the 5th International Symposium on Advances in Signal Processing and Intelligent Recognition Systems, SIRS 2019, held in Trivandrum, India, in December 2019. The 19 revised full papers and 8 revised short papers presented were carefully reviewed and selected from 63 submissions. The papers cover wide research fields including information retrieval, human-computer interaction (HCI), information extraction, speech recognition.
Author : Abbas Jamalipour
Publisher : John Wiley & Sons
ISBN 13 :
Total Pages : 496 pages
Book Rating : 4.3/5 (91 download)
Download or read book The Wireless Mobile Internet written by Abbas Jamalipour and published by John Wiley & Sons. This book was released on 2003-03-07 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: Providing Internet services to mobile users has become the most significant topic within the telecommunications research community in the past few years. As a result several books have been published by the experts from the cellular communications world and researchers from the computer science field. While cellular books cover architecture and air interface of the second- and third-generation wireless systems, computer networks and Internet books overview some fundamentals and protocols on migrating the fix-IP into mobile environment. Other books that claimed to cover the both topics in the past, however, also failed to provide a complete literature on wireless IP, because of focusing on either access technology or network protocols. The Wireless Mobile Internet - Architectures, Protocols, and Services elegantly bridges this gap and therefore provides the first complete literature for the wireless Internet both describing the standard activities and the current status of the wireless IP, as well as detailing network models and specific techniques. While some chapters in the Wireless Mobile Internet describe the standard activities and the current status of the wireless IP other chapters detail network models and specific techniques that usually approached by academic researchers. * Comprehensive yet simple understanding of the wireless Internet through usage of more than 250 conceptual and numerical result figures * Logical organization for customized use as a reference book on the state-of-the-art technology for wireless Internet, a text for fundamental components of the wireless Internet, standards, and a guideline for advanced research topics * Provides an easy-to-read but complete reference for core network and access technology of 2G and 3G cellular systems as well as related standards * Illustrates the main features of future mobile networks * Offers a thorough literature on essentials for a mobile network: quality of service, traffic modelling and management, mobility management, transport protocols, and network protocols * Uniquely covers all relevant telecommunication access and network technologies for wireless Internet from wireless LAN to satellite Essential reading for researchers from industry and academia in the field of wireless cellular networks and Internet, practicing engineers who need a single text on the subject as well as senior level undergraduates and first-year postgraduates.
Author : Kenneth C. Laudon
Publisher : Pearson Educación
ISBN 13 : 9789702605287
Total Pages : 618 pages
Book Rating : 4.6/5 (52 download)
Download or read book Management Information Systems written by Kenneth C. Laudon and published by Pearson Educación. This book was released on 2004 with total page 618 pages. Available in PDF, EPUB and Kindle. Book excerpt: Management Information Systems provides comprehensive and integrative coverage of essential new technologies, information system applications, and their impact on business models and managerial decision-making in an exciting and interactive manner. The twelfth edition focuses on the major changes that have been made in information technology over the past two years, and includes new opening, closing, and Interactive Session cases.
Author : Kewei Sha
Publisher : River Publishers
ISBN 13 : 8793379897
Total Pages : 446 pages
Book Rating : 4.7/5 (933 download)
Download or read book Security, Privacy and Reliability in Computer Communications and Networks written by Kewei Sha and published by River Publishers. This book was released on 2016-11-30 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: Future communication networks aim to build an intelligent and efficient living environment by connecting a variety of heterogeneous networks to fulfill complicated tasks. These communication networks bring significant challenges in building secure and reliable communication networks to address the numerous threat and privacy concerns. New research technologies are essential to preserve privacy, prevent attacks, and achieve the requisite reliability. Security, Privacy and Reliability in Computer Communications and Networks studies and presents recent advances reflecting the state-of-the-art research achievements in novel cryptographic algorithm design, intrusion detection, privacy preserving techniques and reliable routing protocols. Technical topics discussed in the book include: Vulnerabilities and Intrusion DetectionCryptographic Algorithms and EvaluationPrivacy Reliable Routing Protocols This book is ideal for personnel in computer communication and networking industries as well as academic staff and collegial, master, Ph.D. students in computer science, computer engineering, cyber security, information insurance and telecommunication systems.
