Author: Karthikeyan Sundaresan
Publisher:
ISBN:
Category :
Languages : en
Pages : 240
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Book Description
For heterogeneous smart antenna networks, we develop theoretical performance bounds by studying the impact of increasing degree of heterogeneity on network throughput performance. Given that the antenna technologies are already unified in the network, unified solutions are not required. However, we do develop efficient MAC and routing protocols to best leverage the available heterogeneous capabilities present in the network. We also design efficient cooperation strategies that will further help the communication protocols in exploiting the available heterogeneous capabilities in the network to the best possible extent.
Author: Prasant Mohapatra
Publisher: Springer Science & Business Media
ISBN: 0387226907
Category : Technology & Engineering
Languages : en
Pages : 287
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Book Description
AD HOC NETWORKS: Technologies and Protocols is a concise in-depth treatment of various constituent components of ad hoc network protocols. It reviews issues related to medium access control, scalable routing, group communications, use of directional/smart antennas, network security, and power management among other topics. The authors examine various technologies that may aid ad hoc networking including the presence of an ability to tune transmission power levels or the deployment of sophisticated smart antennae. Contributors to this volume include experts that have been active in ad hoc network research and have published in the premier conferences and journals in this subject area. AD HOC NETWORKS: Protocols and Technologies will be immensely useful as a reference work to engineers and researchers as well as to advanced level students in the areas of wireless networks, and computer networks.
Author: Somprakash Bandyopadhyay
Publisher: CRC Press
ISBN: 1420013238
Category : Computers
Languages : en
Pages : 210
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Book Description
A large portion of the network capacity of an ad hoc network can be wasted by the medium access mechanisms of omni-directional antennas. To overcome this problem, researchers propose the use of directional or adaptive antennas that largely reduce radio interference, improving the utilization of wireless medium and the resulting network throughput.
Author: Sk. Mohammad Rokonuzzaman
Publisher:
ISBN:
Category :
Languages : en
Pages : 560
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Book Description
Wireless ad hoc networks can suffer from capacity and scalability problems, especially when omni-directional antennas are used. Meeting the required Quality of Service (QoS) of the communications becomes a difficult task in such networks. To help alleviate these traditional problems of wireless ad hoc networks, this thesis presents the design and analysis of low level protocols and algorithms that intelligently use adaptive beamforming smart antennas to facilitate the provision of communications meeting QoS constraints of applications. The network model for which the protocols and algorithms in this thesis are designed is a cooperative, community wireless ad hoc network where nodes are in general fixed and there is no centrally owned infrastructure. This is an extension to the Suburban Ad-Hoc Network (SAHN). Though SAHN is a quasi-static network, much of the work of this thesis can be extended to include mobility. In this thesis medium access control, routing and topology control protocols and algorithms that are aware of QoS requirements of communications have been developed, simulated and evaluated. These protocols and algorithms take advantage of special characteristics of smart antennas. As a complete system, the new algorithms and protocols within a smart antenna equipped wireless ad hoc network, offers significant performance gains over traditional wireless networks.
Author: Sun, Chen
Publisher: IGI Global
ISBN: 1599049899
Category : Education
Languages : en
Pages : 584
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Book Description
Provides information on smart antenna technologies featuring contributions with in-depth descriptions of terminologies, concepts, methods, and applications related to smart antennas in various wireless systems.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Wireless LANs are networks that are typically set up to provide data connectivity to an access point for a set of user nodes. In such localized networks, since all nodes have "equal" right to the bandwidth resources of the access point, the nodes compete for the common wireless medium in a distributed manner. Wireless ad hoc networks are extensions of wireless LANs such that nodes connect without the intervention of an access point. It is well known that such networks employ omnidirectional antennas at nodes and access points, adversely affecting throughput performance. In ad hoc networks, poor single hop performance results in poor multihop throughput, especially if some nodes are path "bottlenecks". In this work, we study and evaluate the performance improvement in wireless LANs and ad hoc networks with multiple-beam smart antennas. Our work examines a variety of issues that arise with the deployment of smart antennas at nodes, at different layers of the protocol stack, especially those related to medium access control, PHY-MAC interaction, scheduling, mulithop performance, and analytical bounds on achievable throughput. We propose schemes for medium access control with spatial multiplexing based on Carrier Sense Multiple Access (CSMA), to maximize one-hop throughput in wireless LANs and ad hoc networks. We develop an analytical model for the throughput in such networks for two different protocols, CSMA and Slotted Aloha, wherein nodes are equipped with smart antennas. Our model gives us insight into the choice of a medium access protocol based on the ambient traffic conditions, since we can predict the behavior of the protocol under different values of offered load. We also attempt to modify the basic protocols for improved performance with smart antennas. In addition, we examine the different types of smart antenna techniques that may be used at nodes of a mobile ad hoc network and study their relative merits and demerits. Further, we explore how efficient scheduling may be carried out in an ad hoc network where nodes are equipped with smart antennas, for which we study different heuristics. Finally, we perform multihop network simulation to evaluate the performance of multiple beam smart antennas at nodes in a distributed ad hoc network. Our analytical and simulation results are encouraging, and show that we can obtain drastic performance improvements in one-hop throughput with the use of smart antennas and suitably designed medium access protocols. Also, bottlenecks in congested areas (heavily loaded single hop) in multihop ad hoc networks may be cleared with such antennas. This provides tremendous improvement in the aggregate network throughput. In summary, our research on protocol design and throughput evaluation provides sufficient evidence for considering the deployment of smart antenna access points or nodes in wireless LANs and ad hoc networks.
Author: Ekram Hossain
Publisher: Springer Science & Business Media
ISBN: 0387688390
Category : Technology & Engineering
Languages : en
Pages : 351
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Book Description
This book collects articles featuring recent advances in the theory and applications of wireless mesh networking technology. The contributed articles, from the leading experts in the field, cover both theoretical concepts and system-level implementation issues. The book starts with the essential background on the basic concepts and architectures of wireless mesh networking and then presents advanced level materials in a step-by-step fashion.
Author: Juan P. Maícas
Publisher: BoD – Books on Demand
ISBN: 953307910X
Category : Technology & Engineering
Languages : en
Pages : 288
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Book Description
Recent Developments in Mobile Communications - A Multidisciplinary Approach offers a multidisciplinary perspective on the mobile telecommunications industry. The aim of the chapters is to offer both comprehensive and up-to-date surveys of recent developments and the state-of-the-art of various economical and technical aspects of mobile telecommunications markets. The economy-oriented section offers a variety of chapters dealing with different topics within the field. An overview is given on the effects of privatization on mobile service providers' performance; application of the LAM model to market segmentation; the details of WAC; the current state of the telecommunication market; a potential framework for the analysis of the composition of both ecosystems and value networks using tussles and control points; the return of quality investments applied to the mobile telecommunications industry; the current state in the networks effects literature. The other section of the book approaches the field from the technical side. Some of the topics dealt with are antenna parameters for mobile communication systems; emerging wireless technologies that can be employed in RVC communication; ad hoc networks in mobile communications; DoA-based Switching (DoAS); Coordinated MultiPoint transmission and reception (CoMP); conventional and unconventional CACs; and water quality dynamic monitoring systems based on web-server-embedded technology.
Author: Osama Bazan
Publisher: Springer Nature
ISBN: 3030774597
Category : Technology & Engineering
Languages : en
Pages : 128
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Book Description
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.
