Download or read book Partial Decode forward in Relay Networks written by Yao Tang and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In the second part of the thesis, we first introduce a discrete memoryless relay network model consisting of one source, one destination and N relays. We then design a scheme based on partial decode-forward relaying. The source splits its message into one common part and N+1 private parts which are to be decoded at different relays. The source encodessplit message parts using length-N block Markov coding, in which each private message part is independently superimposed on the common parts of the current and N previous blocks. Using joint sliding window decoding, each relay fully recovers the common message part and its intended private message part with the same block index, then forwards them together to the following nodes in the next block. We derive the achievable rate of this scheme in a compact form.
Download or read book Performance Analysis of Relay Network Using Partial Compute and Forward Scheme and Physical layer Network Coding written by Navyatha Gavvala and published by . This book was released on 2011 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, the bit error rate (BER) performance of a relay network using both a partial compute-and-forward (PCF) strategy and a decode-and-forward (DF) strategy is studied. The system model considered is a relay network, which has multiple sources, multiple relay nodes, and one destination. First, in this thesis, BER performance of the relay network is analyzed using a decode-and-forward strategy. Second, another approach, called a partial compute-and-forward strategy, is proposed. The key idea here is to add dither, to the transmitted messages, then encode and forward the messages to the relay nodes like lattice codes. Once the relay nodes receive the linear combination of transmitted signals, they first remove the dithered signal and then map it to a linear combination of the transmitted message. This linear combination of the message is forwarded to the destination under a power constraint at the relay. Results show that the BER performance of the partial compute-and-forward strategy is better than the decode-and-forward strategy applied at the relay nodes. This thesis also analyzes the BER performance of a four-user physical-layer network coding (PNC), the implementation of which enhances the throughput and routing capabilities of a relay network.
Download or read book Network Information Theory written by Abbas El Gamal and published by Cambridge University Press. This book was released on 2011-12-08 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive treatment of network information theory and its applications provides the first unified coverage of both classical and recent results. With an approach that balances the introduction of new models and new coding techniques, readers are guided through Shannon's point-to-point information theory, single-hop networks, multihop networks, and extensions to distributed computing, secrecy, wireless communication, and networking. Elementary mathematical tools and techniques are used throughout, requiring only basic knowledge of probability, whilst unified proofs of coding theorems are based on a few simple lemmas, making the text accessible to newcomers. Key topics covered include successive cancellation and superposition coding, MIMO wireless communication, network coding, and cooperative relaying. Also covered are feedback and interactive communication, capacity approximations and scaling laws, and asynchronous and random access channels. This book is ideal for use in the classroom, for self-study, and as a reference for researchers and engineers in industry and academia.
Download or read book Coherent Cooperative Relaying in Low Mobility Wireless Multiuser Networks written by Stefan Berger and published by Logos Verlag Berlin GmbH. This book was released on 2010 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Distributed Opportunistic Wireless Channel Access in Decode and forward Relay Networks written by Shuai Zhou and published by . This book was released on 2015 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main goal of this thesis is to develop an opportunistic scheduling strategy in distributed networks with decode-and-forward (DF) relays without direct link. Two cases are considered: 1) the winner source has full CSI (CSI of source-relay link and relay-destination link), 2) the winner source has partial CSI (CSI of source-relay link only). For the first case, a pure threshold scheduling strategy is proposed. Specifically, only when the minimum of the detected signal-to-noise ratio (SNR) of the source-relay link and relay-destination link exceeds a certain threshold, it is optimal for the source to transmit data. For the second case, the scheduling strategy is also threshold-based. In specific, when the detected SNR of the source-relay link exceeds a certain threshold, it is optimal for the winner source to transmit data. After the relay receives the data, the optimal strategy is probing the second hop until the second-hop channel condition is good.
Download or read book Opportunities Benefits and Constraints of Relaying in Mobile Communication Systems written by Peter Matthias R. Rost and published by Jörg Vogt Verlag. This book was released on 2009 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cognitive Wireless Networks written by Frank H. P. Fitzek and published by Springer Science & Business Media. This book was released on 2007-09-04 with total page 725 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book advocates the idea of breaking up the cellular communication architecture by introducing cooperative strategies among wireless devices through cognitive wireless networking. It details the cooperative and cognitive aspects for future wireless communication networks. Coverage includes social and biological inspired behavior applied to wireless networks, peer-to-peer networking, cooperative networks, and spectrum sensing and management.
Download or read book Topics in Multi User Information Theory written by Gerhard Kramer and published by Now Publishers Inc. This book was released on 2008 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents a review of eleven of the fundamental issues in multi-user information theory. Each chapter is devoted to one particular issue and follows the same structure and starts with a problem description and then describes solutions to the problem for general and specific cases.
Download or read book Issues in Information Science Research 2013 Edition written by and published by ScholarlyEditions. This book was released on 2013-05-01 with total page 981 pages. Available in PDF, EPUB and Kindle. Book excerpt: Issues in Information Science Research / 2013 Edition is a ScholarlyEditions™ book that delivers timely, authoritative, and comprehensive information about Web and Grid Services. The editors have built Issues in Information Science Research: 2013 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Web and Grid Services in this book to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Issues in Information Science Research: 2013 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.
Download or read book Layered Transmissions Over Decode and Forward Wireless Relay Networks written by Tu Viet Nguyen and published by . This book was released on 2013 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this dissertation, we consider a wireless relay network with a single source, a single destination, and multiple relays. The relays are half-duplex and use the decode-and-forward protocol. In the first part, we consider the layered transmission using an information-theoretic approach, where a successively refinable Gaussian source is transmitted using superposition coding. In the second part, we consider the layered transmission using a communication-theoretic approach, where a layered video-encoded bitstream is transmitted using hierarchical modulation. In both cases, we assume the transmitted source can be partitioned into a base layer (BL) and an enhancement layer (EL). The BL is more important than the EL, and the source cannot be reconstructed without the BL. It takes two time slots for each transmission. In the first time slot, the source broadcasts a message that consists of a BL and an EL to all the relays and the destination. The relays detect the transmitted message individually. Each relay detects the BL first, and, if successful, then it detects the EL. Unlike other cooperation techniques, we assume the relays are not able to communicate with each other, and that there is no feedback channel from the destination to the relays, or from the relays to the source. Hence, a given relay does not know if any other relay successfully decodes a specific layer. Rather, we assume that, in the second time slot, each relay will forward all its successfully decoded layers to the destination. That is, a relay can transmit either only the BL or both the BL and the EL to the destination (or not transmit at all).
Download or read book Intelligent Data Engineering and Analytics written by Vikrant Bhateja and published by Springer Nature. This book was released on 2023-02-23 with total page 627 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book presents the proceedings of the 10th International Conference on Frontiers of Intelligent Computing: Theory and Applications (FICTA 2022), held at NIT Mizoram, Aizawl, Mizoram, India during 18 – 19 June 2022. Researchers, scientists, engineers, and practitioners exchange new ideas and experiences in the domain of intelligent computing theories with prospective applications in various engineering disciplines in the book. These proceedings are divided into two volumes. It covers broad areas of information and decision sciences, with papers exploring both the theoretical and practical aspects of data-intensive computing, data mining, evolutionary computation, knowledge management and networks, sensor networks, signal processing, wireless networks, protocols and architectures. This volume is a valuable resource for postgraduate students in various engineering disciplines.
Download or read book Physical Layer Security for Cooperative Relay Networks written by Yulong Zou and published by Springer. This book was released on 2016-04-20 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Integrated Terrestrial and Non Terrestrial Networks written by Muhammad Ali Jamshed and published by Springer Nature. This book was released on with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wireless Network Information Flow written by Amir S. Avestimehr and published by . This book was released on 2008 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Green Energy Efficient and Sustainable Networks written by Josip Lorincz and published by MDPI. This book was released on 2020-01-21 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book Green, Energy-Efficient and Sustainable Networks provides insights and solutions for a range of problems in the field of obtaining greener, energy-efficient, and sustainable networks. The book contains the outcomes of the Special Issue on “Green, Energy-Efficient and Sustainable Networks” of the Sensors journal. Seventeen high-quality papers published in the Special Issue have been collected and reproduced in this book, demonstrating significant achievements in the field. Among the published papers, one paper is an editorial and one is a review, while the remaining 15 works are research articles. The published papers are self-contained peer-reviewed scientific works that are authored by more than 75 different contributors with both academic and industry backgrounds. The editorial paper gives an introduction to the problem of information and communication technology (ICT) energy consumption and greenhouse gas emissions, presenting the state of the art and future trends in terms of improving the energy-efficiency of wireless networks and data centers, as the major energy consumers in the ICT sector. In addition, the published articles aim to improve energy efficiency in the fields of software-defined networking, Internet of things, machine learning, authentication, energy harvesting, wireless relay systems, routing metrics, wireless sensor networks, device-to-device communications, heterogeneous wireless networks, and image sensing. The last paper is a review that gives a detailed overview of energy-efficiency improvements and methods for the implementation of fifth-generation networks and beyond. This book can serve as a source of information in industrial, teaching, and/or research and development activities. The book is a valuable source of information, since it presents recent advances in different fields related to greening and improving the energy-efficiency and sustainability of those ICTs particularly addressed in this book
Download or read book Multiple Access Channels written by Ezio Biglieri and published by IOS Press. This book was released on 2007 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surveys general results on multiple-access channels, and gives an overview of the problems of CDMA solutions. This work includes chapters devoted to the information-theoretical aspects of multiple-access communication. It discusses multiple-access techniques and covers coding techniques.
