Cooperative Relaying and Its Application PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Cooperative Relaying and Its Application PDF full book. Access full book title Cooperative Relaying and Its Application by Stefan Valentin. Download full books in PDF and EPUB format.
Author: Stefan Valentin
Publisher: Sudwestdeutscher Verlag Fur Hochschulschriften AG
ISBN: 9783838118581
Category :
Languages : en
Pages : 224
Get Book Here
Book Description
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.
Author: Stefan Valentin
Publisher: Sudwestdeutscher Verlag Fur Hochschulschriften AG
ISBN: 9783838118581
Category :
Languages : en
Pages : 224
Get Book Here
Book Description
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.
Author: Stefan Berger
Publisher: Logos Verlag Berlin GmbH
ISBN: 383252536X
Category :
Languages : en
Pages : 337
Get Book Here
Book Description
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.
Author: Peter Matthias R. Rost
Publisher: Jörg Vogt Verlag
ISBN: 3938860235
Category :
Languages : en
Pages : 226
Get Book Here
Book Description
Author: Joseph Sanju George
Publisher:
ISBN:
Category :
Languages : en
Pages : 36
Get Book Here
Book Description
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.
Author: Yulong Zou
Publisher: Springer
ISBN: 3319311743
Category : Computers
Languages : en
Pages : 110
Get Book Here
Book Description
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.
Author: Mohammad S. Obaidat
Publisher: John Wiley & Sons
ISBN: 0470749156
Category : Technology & Engineering
Languages : en
Pages : 354
Get Book Here
Book Description
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.
Author: Jingyuan Zhao
Publisher:
ISBN: 9781799868712
Category :
Languages : en
Pages :
Get Book Here
Book Description
Author: Y.-W. Peter Hong
Publisher: Springer Science & Business Media
ISBN: 1441971947
Category : Technology & Engineering
Languages : en
Pages : 411
Get Book Here
Book Description
Cooperative and relay communications have recently become the most widely explored topics in communications, whereby users cooperate in transmitting their messages to the destination, instead of conventional networks which operate independently and compete among each other for channel resources. As the field has progressed, cooperative communications have become a design concept rather than a specific transmission technology. This concept has revolutionized the design of wireless networks, allowing increased coverage, throughput, and transmission reliability even as conventional transmission techniques gradually reach their limits. Cooperative and relay technologies have also made their way toward next generation wireless standards, such as IEEE802.16 (WiMAX) or LTE, and have been incorporated into many modern wireless applications, such as cognitive radio and secret communications. Cooperative Communications and Networking: Technologies and System Design provides a systematic introduction to the fundamental concepts of cooperative communications and relays technology to enable engineers, researchers or graduate students to conduct advanced research and development in this area. Cooperative Communications and Networking: Technologies and System Design provides researchers, graduate students, and practical engineers with sufficient knowledge of both the background of cooperative communications and networking, and potential research directions.
Author: 薛學儒
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Author: K. J. Ray Liu
Publisher: Cambridge University Press
ISBN: 0521895138
Category : Computers
Languages : en
Pages : 643
Get Book Here
Book Description
Presents the fundamentals of cooperative communications and networking with a holistic approach to principal topics where improvements can be obtained.
