Multicast And Relay Beamforming In Wireless Multi User Networks
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Multiuser Transmit Beamforming for Maximum Sum Capacity in Tactical Wireless Multicast Networks
| Author | : |
| Publisher | : |
| Total Pages | : 171 |
| Release | : 2006 |
| Genre | : |
| ISBN | : |
Tactical wireless networks often comprise clusters of nodes, which are fed information from a head node. Transmit antenna arrays mounted on the head node (e.g., unmanned aerial vehicle) offer an attractive means of boosting capacity and assuring quality of service through transmit beamforming. The central goal of our research was to investigate efficient multiuser transmit beamforming strategies, and develop high-throughput low-complexity algorithms that will meet the needs of future tactical wireless networks. Sum capacity, quality of service, and fair service objectives were considered, under unicast and multicast scenarios. A key innovation of our work is the concept of physical layer multicasting, which affords significant capacity gains. A number of effective and efficient algorithms were developed, drawing upon and contributing to semidefinite relaxation (SDR) tools. Closely-related added-value topics of our research program included: i) computationally efficient quasi-optimal multiple input multiple output detection (using lattice search, data association, and SDR tools); ii) accurate and scalable node localization from pairwise distance estimates; and iii) tracking of time-varying carrier signals (using and developing associated particle filtering tools). Our work on these topics has been reported in seven (IEEE, SIAM) journal papers and seven IEEE conference papers. Variants of some of our published algorithms are currently considered for adoption by industry.
Coherent Cooperative Relaying in Low Mobility Wireless Multiuser Networks
| Author | : Stefan Berger |
| Publisher | : Logos Verlag Berlin GmbH |
| Total Pages | : 337 |
| Release | : 2010 |
| Genre | : |
| ISBN | : 383252536X |
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.
New Directions in Wireless Communications Research
| Author | : Vahid Tarokh |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 483 |
| Release | : 2009-08-19 |
| Genre | : Technology & Engineering |
| ISBN | : 1441906738 |
New Directions in Wireless Communications Research addresses critical issues in the design and performance analysis of current and future wireless system design. Intended for use by system designers and academic researchers, the contributions are by acknowledged international leaders in their field. Topics covered include: (1) Characterization of wireless channels; (2) The principles and challenges of OFDM; (3) Low-correlation sequences for communications; (4) Resource allocation in wireless systems; (5) Signal processing for wireless systems, including iterative systems collaborative beamforming and interference rejection and network coding; (6) Multi-user and multiple input-multiple output (MIMO) communications; (7) Cooperative wireless networks, cognitive radio systems and coded bidirectional relaying in wireless networks; (8) Fourth generation standards such as LTE and WiMax and standard proposals such as UMB. With chapters from some of the leading researchers in the field, this book is an invaluable reference for those studying and practicing in the field of wireless communications. The book provides the most recent information on topics of current interest to the research community including topics such as sensor networks, coding for networks, cognitive networks and many more.
Advanced Computational Methods for Knowledge Engineering
| Author | : Thanh Binh Nguyen |
| Publisher | : Springer |
| Total Pages | : 290 |
| Release | : 2016-05-01 |
| Genre | : Technology & Engineering |
| ISBN | : 3319388843 |
This proceedings consists of 20 papers which have been selected and invited from the submissions to the 4th International Conference on Computer Science, Applied Mathematics and Applications (ICCSAMA 2016) held on 2-3 May, 2016 in Laxenburg, Austria. The conference is organized into 5 sessions: Advanced Optimization Methods and Their Applications, Models for ICT applications, Topics on discrete mathematics, Data Analytic Methods and Applications and Feature Extractio, respectively. All chapters in the book discuss theoretical and practical issues connected with computational methods and optimization methods for knowledge engineering. The editors hope that this volume can be useful for graduate and Ph.D. students and researchers in Applied Sciences, Computer Science and Applied Mathematics.
Millimeter-Wave Networks
| Author | : Peng Yang |
| Publisher | : Springer Nature |
| Total Pages | : 169 |
| Release | : 2021-10-27 |
| Genre | : Computers |
| ISBN | : 3030886301 |
This book provides a comprehensive review and in-depth study on efficient beamforming design and rigorous performance analysis in mmWave networks, covering beam alignment, beamforming training and beamforming-aided caching. Due to significant beam alignment latency between the transmitter and the receiver in existing mmWave systems, this book proposes a machine learning based beam alignment algorithm for mmWave networks to determine the optimal beam pair with a low latency. Then, to analyze and enhance the performance of beamforming training (BFT) protocol in 802.11ad mmWave networks, an analytical model is presented to evaluate the performance of BFT protocol and an enhancement scheme is proposed to improve its performance in high user density scenarios. Furthermore, it investigates the beamforming-aided caching problem in mmWave networks, and proposes a device-to-device assisted cooperative edge caching to alleviate backhaul congestion and reduce content retrieval delay. This book concludes with future research directions in the related fields of study. The presented beamforming designs and the corresponding research results covered in this book, provides valuable insights for practical mmWave network deployment and motivate new ideas for future mmWave networking. This book targets researchers working in the fields of mmWave networks, beamforming design, and resource management as well as graduate students studying the areas of electrical engineering, computing engineering and computer science. Professionals in industry who work in this field will find this book useful as a reference.
802.11ac: A Survival Guide
| Author | : Matthew S. Gast |
| Publisher | : "O'Reilly Media, Inc." |
| Total Pages | : 176 |
| Release | : 2013-07-23 |
| Genre | : Computers |
| ISBN | : 1449357725 |
The next frontier for wireless LANs is 802.11ac, a standard that increases throughput beyond one gigabit per second. This concise guide provides in-depth information to help you plan for 802.11ac, with technical details on design, network operations, deployment, and monitoring. Author Matthew Gast—an industry expert who led the development of 802.11-2012 and security task groups at the Wi-Fi Alliance—explains how 802.11ac will not only increase the speed of your network, but its capacity as well. Whether you need to serve more clients with your current level of throughput, or serve your existing client load with higher throughput, 802.11ac is the solution. This book gets you started. Understand how the 802.11ac protocol works to improve the speed and capacity of a wireless LAN Explore how beamforming increases speed capacity by improving link margin, and lays the foundation for multi-user MIMO Learn how multi-user MIMO increases capacity by enabling an AP to send data to multiple clients simultaneously Plan when and how to upgrade your network to 802.11ac by evaluating client devices, applications, and network connections
Beamforming Antennas in Wireless Networks
| Author | : Osama Bazan |
| Publisher | : Springer Nature |
| Total Pages | : 128 |
| Release | : 2021-07-08 |
| Genre | : Technology & Engineering |
| ISBN | : 3030774597 |
Wireless networks are facing growing demand for high capacity, better coverage, support of new applications and broad range of services. In this book, the authors first present an overview of beamforming antennas and millimeter wave communications followed by a discussion on the challenges and issues facing MAC and multi-hop routing in the wireless networks with beamforming antennas. Then, they discuss various MAC and routing protocols that are specifically designed to address those issues and exploit the benefits of millimeter wave and beamforming antennas. Authors also present a framework to provide Quality of Service (QoS) in contention-based wireless networks with beamforming antennas. Finally, the book is concluded with a discussion on open research topics for future generation WLAN systems.
