Author: George D. KondylisPublisher:
ISBN:
Category :
Languages : en
Pages : 444
Book Description
On Indoor Wireless Channel Characterization and the Design of Interference Aware Medium Access Control Protocols for Packet Switched Networks
Author: George D. KondylisDissertation Abstracts International
Author: Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 924
Book Description
Proceedings
Author: Embracing Interference in Wireless Systems
Author: Shyamnath GollakotaPublisher: Morgan & Claypool Publishers
ISBN: 1627054766
Category : Computers
Languages : en
Pages : 246
Book Description
The wireless medium is a shared resource. If nearby devices transmit at the same time, their signals interfere, resulting in a collision. In traditional networks, collisions cause the loss of the transmitted information. For this reason, wireless networks have been designed with the assumption that interference is intrinsically harmful and must be avoided. This book, a revised version of the author's award-winning Ph.D. dissertation, takes an alternate approach: Instead of viewing interference as an inherently counterproductive phenomenon that should to be avoided, we design practical systems that transform interference into a harmless, and even a beneficial phenomenon. To achieve this goal, we consider how wireless signals interact when they interfere, and use this understanding in our system designs. Specifically, when interference occurs, the signals get mixed on the wireless medium. By understanding the parameters of this mixing, we can invert the mixing and decode the interfered packets; thus, making interference harmless. Furthermore, we can control this mixing process to create strategic interference that allow decodability at a particular receiver of interest, but prevent decodability at unintended receivers and adversaries. Hence, we can transform interference into a beneficial phenomenon that provides security. Building on this approach, we make four main contributions: We present the first WiFi receiver that can successfully reconstruct the transmitted information in the presence of packet collisions. Next, we introduce a WiFi receiver design that can decode in the presence of high-power cross-technology interference from devices like baby monitors, cordless phones, microwave ovens, or even unknown technologies. We then show how we can harness interference to improve security. In particular, we develop the first system that secures an insecure medical implant without any modification to the implant itself. Finally, we present a solution that establishes secure connections between any two WiFi devices, without having users enter passwords or use pre-shared secret keys.
Medium Access Control Protocols and Routing Strategies for Wireless Local and Personal Area Networks
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Recent advances in portable computing and wireless technologies are opening up exciting possibilities for the future of wireless mobile networking. More notably, Wireless Local and Personal Area Networks (WLANs and WPANs) technologies are expected to revolutionize the way we live. Given their unprecedented importance, in this dissertation we investigate and suggest new solutions in the context of WLANs and WPANs systems. In the world of WLANs, we study its major representative, namely, the IEEE standard 802.11, while we explore the Bluetooth technology as it is the most prominent solution in the world of WPANs. In the field of Bluetooth, we have identified key issues and made considerable contributions. We have carried out a detailed analytical and simulation analysis of radio interference impact on Bluetooth and proposed ways of mitigating it, such as a novel interference-aware packet segmentation protocol (IBLUES). Moreover, we also introduce an integrated IEEE 802.11 and Bluetooth architecture (BlueStar), which enables efficient information interchange between these two widely used technologies. BlueStar is analyzed in great detail and, among other things, it features a new coexistence method between IEEE 802.11 and Bluetooth which employs a novel combination of carrier sense and adaptive frequency hopping. Next, to handle the inefficiency of the current Bluetooth master/slave communication paradigm, we propose a novel QoS-driven dynamic slot assignment and piconet partitioning algorithms. In the context of IEEE 802.11, we initially investigate advanced MAC-based routing strategies. These strategies, referred to as COPAS (contention-based path selection), are intentionally devised and observed to boost TCP performance over the multi-hop type of IEEE 802.11 ad hoc networks, giventhat TCP is by far the most important and widely used transport protocol in today2s networks. Finally, we design and evaluate a new power control MAC protocol for spatial reusability over ad hoc networks, which is observed to considerably outperform existing MAC protocols. We conclude with some promising future work in the areas of both Bluetooth and IEEE 802.11.
Adaptation and Cross Layer Design in Wireless Networks
Author: Mohamed IbnkahlaPublisher: CRC Press
ISBN: 135183570X
Category : Technology & Engineering
Languages : en
Pages : 428
Book Description
Adaptive techniques play a key role in modern wireless communication systems. The concept of adaptation is emphasized in the Adaptation in Wireless Communications Series through a unified framework across all layers of the wireless protocol stack ranging from the physical layer to the application layer, and from cellular systems to next-generation wireless networks. Adaptation and Cross Layer Design in Wireless Networks is devoted to adaptation in the data link layer, network layer, and application layer. The book presents state-of-the-art adaptation techniques and methodologies, including cross-layer adaptation, joint signal processing, coding and networking, selfishness in mobile ad hoc networks, cooperative and opportunistic protocols, adaptation techniques for multimedia support, self –organizing routing, and tunable security services. It presents several new theoretical paradigms and analytical findings which are supported with various simulation and experimental results. Adaptation in wireless communications is needed in order to achieve high capacity and ubiquitous communications. The current trend in wireless communication systems is to make adaptation dependent upon the state of the relevant parameters in all layers of the system. Focusing on simplified cross layer design approaches, this volume describes advanced techniques such as adaptive resource management, adaptive modulation and coding, 4G communications, QoS, diversity combining, and energy and mobility aware MAC protocols. The first volume in the series, Adaptive Signal Processing in Wireless Communications (cat no.46012) covers adaptive signal processing at the physical layer.
Protocol Design and Analysis for Cooperative Wireless Networks
Author: Wei SongPublisher: Springer
ISBN: 3319477269
Category : Technology & Engineering
Languages : en
Pages : 135
Book Description
This book focuses on the design and analysis of protocols for cooperative wireless networks, especially at the medium access control (MAC) layer and for crosslayer design between the MAC layer and the physical layer. It highlights two main points that are often neglected in other books: energy-efficiency and spatial random distribution of wireless devices. Effective methods in stochastic geometry for the design and analysis of wireless networks are also explored. After providing a comprehensive review of existing studies in the literature, the authors point out the challenges that are worth further investigation. Then, they introduce several novel solutions for cooperative wireless network protocols that reduce energy consumption and address spatial random distribution of wireless nodes. For each solution, the book offers a clear system model and problem formulation, details of the proposed cooperative schemes, comprehensive performance analysis, and extensive numerical and simulation results that validate the analysis and examine the performance under various conditions. The last section of this book reveals several potential directions for the research on cooperative wireless networks that deserve future exploration. Researchers, professionals, engineers, and consultants in wireless communication and mobile networks will find this book valuable. It is also helpful for technical staff in mobile network operations, wireless equipment manufacturers, wireless communication standardization bodies, and governmental regulation agencies.
Design and Analysis of Medium Access Control Protocols for Broadband Wireless Networks
Author: Lin CaiPublisher:
ISBN:
Category :
Languages : en
Pages : 169
Book Description
The next-generation wireless networks are expected to integrate diverse network architectures and various wireless access technologies to provide a robust solution for ubiquitous broadband wireless access, such as wireless local area networks (WLANs), Ultra-Wideband (UWB), and millimeter-wave (mmWave) based wireless personal area networks (WPANs), etc. To enhance the spectral efficiency and link reliability, smart antenna systems have been proposed as a promising candidate for future broadband access networks. To effectively exploit the increased capabilities of the emerging wireless networks, the different network characteristics and the underlying physical layer features need to be considered in the medium access control (MAC) design, which plays a critical role in providing efficient and fair resource sharing among multiple users. In this thesis, we comprehensively investigate the MAC design in both single- and multi-hop broadband wireless networks, with and without infrastructure support.
Networking Fundamentals
Author: Kaveh PahlavanPublisher: John Wiley & Sons
ISBN: 9780470779439
Category : Technology & Engineering
Languages : en
Pages : 656
Book Description
Focusing on the physical layer, Networking Fundamentals provides essential information on networking technologies that are used in both wired and wireless networks designed for local area networks (LANs) and wide-area networks (WANs). The book starts with an overview of telecommunications followed by four parts, each including several chapters. Part I explains the principles of design and analysis of information networks at the lowest layers. It concentrates on the characteristics of the transmission media, applied transmission and coding, and medium access control. Parts II and III are devoted to detailed descriptions of important WANs and LANs respectively with Part II describing the wired Ethernet and Internet as well as cellular networks while Part III covers popular wired LANs and wireless LANs (WLANs), as well as wireless personal area network (WPAN) technologies. Part IV concludes by examining security, localization and sensor networking. The partitioned structure of the book allows flexibility in teaching the material, encouraging the reader to grasp the more simple concepts and to build on these foundations when moving onto more complex information. Networking Fundamentals contains numerous illustrations, case studies and tables to supplement the text, as well as exercises with solutions at the end of each chapter. There is also a companion website with password protected solutions manual for instructors along with other useful resources. Provides a unique holistic approach covering wireless communication technologies, wired technologies and networking One of the first textbooks to integrate all aspects of information networks while placing an emphasis on the physical layer and systems engineering aspects Contains numerous illustrations, case studies and tables to supplement the text, as well as exercises with solutions at the end of each chapter Companion website with password protected solutions manual and other useful resources
Distributed Medium Access Control in Wireless Networks
Author: Ping WangPublisher: Springer Science & Business Media
ISBN: 1461466024
Category : Computers
Languages : en
Pages : 117
Book Description
This brief investigates distributed medium access control (MAC) with QoS provisioning for both single- and multi-hop wireless networks including wireless local area networks (WLANs), wireless ad hoc networks, and wireless mesh networks. For WLANs, an efficient MAC scheme and a call admission control algorithm are presented to provide guaranteed QoS for voice traffic and, at the same time, increase the voice capacity significantly compared with the current WLAN standard. In addition, a novel token-based scheduling scheme is proposed to provide great flexibility and facility to the network service provider for service class management. Also proposed is a novel busy-tone based distributed MAC scheme for wireless ad hoc networks and a collision-free MAC scheme for wireless mesh networks, respectively, taking the different network characteristics into consideration. The proposed schemes enhance the QoS provisioning capability to real-time traffic and, at the same time, significantly improve the system throughput and fairness performance for data traffic, as compared with the most popular IEEE 802.11 MAC scheme.