Cooperative Relaying And Its Application
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Cooperative Relaying And Its Application
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Author : Stefan Valentin
language : en
Publisher: Sudwestdeutscher Verlag Fur Hochschulschriften AG
Release Date : 2010-10
Cooperative Relaying And Its Application written by Stefan Valentin and has been published by Sudwestdeutscher Verlag Fur Hochschulschriften AG this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-10 with categories.
Cooperative relaying is a promising approach to improve data rate and coverage in wireless networks. Although the benefits of cooperation have been consistently shown in theory, the performance of realistic cooperative networks is still not clear. Bridging this gap between theory and practice is the objective of this thesis. This is done in three steps. First, practical selection relaying protocols are analyzed under realistic assumptions. Second, efficient protocol extensions are described and, third, a prototype for cooperative Wireless Local Area Networks (WLANs) is demonstrated. Based on theoretical findings and extensive field measurements, this thesis provides insight into the performance regions of realistic cooperative networks and into implementing cooperative devices. Furthermore, the basic elements of cooperative systems are introduced and a concise taxonomy of common designs is given. This text is, thus, helpful for researchers and engineers who implement cooperative systems, plan to support their networks by relaying, or look for an introduction in the field.
Application Of Cooperative Relaying Schemes In Downlink Uplink Communications In Cellular Networks
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Author : Joseph Sanju George
language : en
Publisher:
Release Date : 2011
Application Of Cooperative Relaying Schemes In Downlink Uplink Communications In Cellular Networks written by Joseph Sanju George and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
In this thesis we have compared the Bit Error Rate (BER) performance of Amplify and Forward (AF), Ideal Decode and Forward (DF) cooperative communication system with conventional system where no cooperation is used. The BER performance of AF, ideal DF cooperative system and conventional system with no cooperation using BPSK is plotted against P/No. An interesting observed made is that both AF and ideal DF cooperative system are comparable in performance when the relay is selected at a faster rate and the channel is estimated at a faster rate for a wider range of P/No values. However, the ideal DF cooperative system shows better BER performance than AF cooperative system when the relay is selected at a slower rate and channel is estimated at a slower rate. At a faster relay selection and channel estimation rate AF cooperative system is better than ideal DF cooperative system since BER performance is comparable and complexity of AF is much less than DF cooperative system.^One disadvantage of increasing the relay selection and channel estimation rate is that the overhead time used to select the relay increases and the throughput efficiency is reduced. It can be concluded that for a system using AF there is a tradeoff between the BER performance and throughput efficiency. The second interesting observation is that when the relay is selected and channel is estimated at a much slower rate BER performance of both AF and ideal DF cooperative system saturates for higher values of P/No. No improvement in BER performance of both AF and ideal DF cooperative system with increase in P/No was observed for slower relay selection and channel estimation rate after a certain value of P/No. We have also proposed a relay selection protocol for cooperative systems using AF cooperation protocol. The proposed relay selection protocol in this thesis has some advantages over the existing protocols proposed for cellular communication.^In our protocol the relay selection is always done at the Base Station for both Uplink and Downlink transmission. This allows us to have a system in which the hardware and software needed for relay selection to be present only at the base station. Also the cooperation threshold value need not be known to all the mobile phones in the cellular network since only the Base Station will use it.
Physical Layer Security For Cooperative Relay Networks
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Author : Yulong Zou
language : en
Publisher: Springer
Release Date : 2016-04-20
Physical Layer Security For Cooperative Relay Networks written by Yulong Zou and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-04-20 with Computers categories.
This book presents physical-layer security as a promising paradigm for achieving the information-theoretic secrecy required for wireless networks. It explains how wireless networks are extremely vulnerable to eavesdropping attacks and discusses a range of security techniques including information-theoretic security, artificial noise aided security, security-oriented beamforming, and diversity assisted security approaches. It also provides an overview of the cooperative relaying methods for wireless networks such as orthogonal relaying, non-orthogonal relaying, and relay selection.Chapters explore the relay-selection designs for improving wireless secrecy against eavesdropping in time-varying fading environments and a joint relay and jammer selection for wireless physical-layer security, where a relay is used to assist the transmission from the source to destination and a friendly jammer is employed to transmit an artificial noise for confusing the eavesdropper. Additionally, the security-reliability tradeoff (SRT) is mathematically characterized for wireless communications and two main relay-selection schemes, the single-relay and multi-relay selection, are devised for the wireless SRT improvement. In the single-relay selection, only the single best relay is chosen for assisting the wireless transmission, while the multi-relay selection invokes multiple relays for simultaneously forwarding the source transmission to the destination.Physical-Layer Security for Cooperative Relay Networks is designed for researchers and professionals working with networking or wireless security. Advanced-level students interested in networks, wireless, or privacy will also find this book a useful resource.
Opportunities Benefits And Constraints Of Relaying In Mobile Communication Systems
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Author : Peter Matthias R. Rost
language : en
Publisher: Jörg Vogt Verlag
Release Date : 2009
Opportunities Benefits And Constraints Of Relaying In Mobile Communication Systems written by Peter Matthias R. Rost and has been published by Jörg Vogt Verlag this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
Cooperative Networking
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Author : Mohammad S. Obaidat
language : en
Publisher: John Wiley & Sons
Release Date : 2011-08-15
Cooperative Networking written by Mohammad S. Obaidat and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-08-15 with Technology & Engineering categories.
This book focuses on the latest trends and research results in Cooperative Networking This book discusses the issues involved in cooperative networking, namely, bottleneck resource management, resource utilization, servers and content, security, and so on. In addition, the authors address instances of cooperation in nature which actively encourage the development of cooperation in telecommunication networks. Following an introduction to the fundamentals and issues surrounding cooperative networking, the book addresses models of cooperation, inspirations of successful cooperation from nature and society, cooperation in networking (for e.g. Peer-to-Peer, wireless ad-hoc and sensor, client-server, and autonomous vehicular networks), cooperation and ambient networking, cooperative caching, cooperative networking for streaming media content, optimal node-task allocation, heterogeneity issues in cooperative networking, cooperative search in networks, and security and privacy issues with cooperative networking. It contains contributions from high profile researchers and is edited by leading experts in this field. Key Features: Focuses on higher layer networking Addresses the latest trends and research results Covers fundamental concepts, models, advanced topics and performance issues in cooperative networking Contains contributions from leading experts in the field Provides an insight into the future direction of cooperative networking Includes an accompanying website containing PowerPoint slides and a glossary of terms (www.wiley.com/go/obaidat_cooperative) This book is an ideal reference for researchers and practitioners working in the field. It will also serve as an excellent textbook for graduate and senior undergraduate courses in computer science, computer engineering, electrical engineering, software engineering, and information engineering and science.
Coherent Cooperative Relaying In Low Mobility Wireless Multiuser Networks
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Author : Stefan Berger
language : en
Publisher: Logos Verlag Berlin GmbH
Release Date : 2010
Coherent Cooperative Relaying In Low Mobility Wireless Multiuser Networks written by Stefan Berger and has been published by Logos Verlag Berlin GmbH this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
In this thesis, several important aspects of cooperative wireless multiuser networks are investigated. The focus lies on coherent two-hop relaying networks where several amplify-and-forward (AF) relays assist the communication between multiple source-destination pairs. First, the impact of local oscillator (LO) imperfections and I/Q imbalance at the relays on two-hop relaying is investigated. A special focus lies on the comparison between frequency division duplexing (FDD) and time division duplexing (TDD) relays. Based on the observation that the direction in which a channel between two wireless nodes is measured has an impact on the estimate, phase synchronization requirements for coherent relaying networks are then found. Several channel estimation protocols that differ in the direction in which the single-hop channels are measured are furthermore identi'ed and their performance is compared. Next, a very simple phase synchronization scheme is presented that provides a set of relays with a common LO phase. Two coherent beamforming schemes, namely multiuser zero-forcing (MUZF) and multiuser minimum mean squared error (MMSE) relaying, are then investigated. Finally, a real-world demonstrator for distributed wireless communication networks (called RACooN Lab) is presented. It was used to implement coherent cooperative communication schemes on a practical two-hop relaying network.
Geographic Relaying And Its Application To Cooperative Routing In Wireless Networks
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Author : 薛學儒
language : en
Publisher:
Release Date : 2013
Geographic Relaying And Its Application To Cooperative Routing In Wireless Networks written by 薛學儒 and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Cooperative Wireless Communications
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Author : Yan Zhang
language : en
Publisher: CRC Press
Release Date : 2009-03-10
Cooperative Wireless Communications written by Yan Zhang and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009-03-10 with Computers categories.
Cooperative devices and mechanisms are increasingly important to enhance the performance of wireless communications and networks, with their ability to decrease power consumption and packet loss rate and increase system capacity, computation, and network resilience. Considering the wide range of applications, strategies, and benefits associated wit
Lte Advanced Relay Technology And Standardization
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Author : Yifei Yuan
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-07-25
Lte Advanced Relay Technology And Standardization written by Yifei Yuan and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-07-25 with Technology & Engineering categories.
LTE-Advanced relay technology and standardization provides a timely reference work for relay technology with the finalizing of LTE Release 10 specifications. LTE-Advanced is quickly becoming the global standard for 4G cellular communications. The relay technology, as one of the key features in LTE-Advanced, helps not only to improve the system coverage and capacity, but also to save the costs of laying wireline backhaul. As a leading researcher in the field of LTE-Advanced standards, the author provides an in-depth description of LTE-A relay technology, and explains in detail the standard specification and design principles. Readers from both academic and industrial fields can find sections of interest to them: Sections 2 & 4 could benefit researchers in academia and those who are engaged in exploratory work, while Sections 3 & 4 are more useful to engineers. Dr. Yifei Yuan is the Technical Director at the Standards Department of ZTE Inc.
Innovative Data Communication Technologies And Application
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Author : Jennifer S. Raj
language : en
Publisher: Springer Nature
Release Date : 2021-02-02
Innovative Data Communication Technologies And Application written by Jennifer S. Raj and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-02-02 with Computers categories.
This book presents the latest research in the fields of computational intelligence, ubiquitous computing models, communication intelligence, communication security, machine learning, informatics, mobile computing, cloud computing and big data analytics. The best selected papers, presented at the International Conference on Innovative Data Communication Technologies and Application (ICIDCA 2020), are included in the book. The book focuses on the theory, design, analysis, implementation and applications of distributed systems and networks.