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Performance Improvement Of Ad Hoc Networks Using Directional Antennas And Power Control
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Book Synopsis Performance improvement of ad hoc networks using directional antennas and power control by : Qilei Bian
Download or read book Performance improvement of ad hoc networks using directional antennas and power control written by Qilei Bian and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Performance Improvement of Ad Hoc Networks Using Directional Antennas and Power Control by :
Download or read book Performance Improvement of Ad Hoc Networks Using Directional Antennas and Power Control written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Au cours de la dernière décennie, un intérêt remarquable a été éprouvé en matière des réseaux ad hoc sans fil capables de s'organiser sans soutien des infrastructures. L'utilisation potentielle d'un tel réseau existe dans de nombreux scénarios, qui vont du génie civil et secours en cas de catastrophes aux réseaux de capteurs et applications militaires. La Fonction de coordination distribuée (DCF) du standard IEEE 802.11 est le protocole dominant des réseaux ad hoc sans fil. Cependant, la méthode DCF n'aide pas à profiter efficacement du canal partagé et éprouve de divers problèmes tels que le problème de terminal exposé et de terminal caché. Par conséquent, au cours des dernières années, de différentes méthodes ont été développées en vue de régler ces problèmes, ce qui a entraîné la croissance de débits d'ensemble des réseaux. Ces méthodes englobent essentiellement la mise au point de seuil de détecteur de porteuse, le remplacement des antennes omnidirectionnelles par des antennes directionnelles et le contrôle de puissance pour émettre des paquets adéquatement. Comparées avec les antennes omnidirectionnelles, les antennes directionnelles ont de nombreux avantages et peuvent améliorer la performance des réseaux ad hoc. Ces antennes ne fixent leurs énergies qu'envers la direction cible et ont une portée d'émission et de réception plus large avec la même somme de puissance. Cette particularité peut être exploitée pour ajuster la puissance d'un transmetteur en cas d'utilisation d'une antenne directionnelle. Certains protocoles de contrôle de puissance directionnel MAC ont été proposés dans les documentations. La majorité de ces suggestions prennent seulement la transmission directionnelle en considération et, dans leurs résultats de simulation, ces études ont l'habitude de supposer que la portée de transmission des antennes omnidirectionnelles et directionnelles est la même. Apparemment, cette supposition n'est pas toujours vraie dans les situations réelles. De surcroî
Book Synopsis Wireless Network Performance Enhancement via Directional Antennas: Models, Protocols, and Systems by : John D. Matyjas
Download or read book Wireless Network Performance Enhancement via Directional Antennas: Models, Protocols, and Systems written by John D. Matyjas and published by CRC Press. This book was released on 2015-11-18 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: Directional antenna technologies have made significant advancements in the last decade. These advances have opened the door to many exciting new design opportunities for wireless networks to enhance quality of service (QoS), performance, and network capacity. In this book, experts from around the world present the latest research and development in
Book Synopsis Enhancing the Performance of Ad Hoc Wireless Networks with Smart Antennas by : Somprakash Bandyopadhyay
Download or read book Enhancing the Performance of Ad Hoc Wireless Networks with Smart Antennas written by Somprakash Bandyopadhyay and published by CRC Press. This book was released on 2016-04-19 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Power Management in Wireless Ad Hoc Networks with Directional Antennas by : Ankur Gupta
Download or read book Power Management in Wireless Ad Hoc Networks with Directional Antennas written by Ankur Gupta and published by . This book was released on 2010 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: The past decade has witnessed a remarkable interest in wireless ad hoc networks that operate without any infrastructure support. The potential for deployment of such networks exists in many scenarios ranging from civil and construction engineering, disaster relief to sensor networks and military applications. The IEEE 802.11 Distributed Coordination Function (DCF) is the dominant MAC (layer) protocol for wireless ad hoc networks. Though the DCF scheme has survived the test of time, it still has its characteristic flaws namely the hidden and exposed terminal problems. Various protocols have been suggested to address these problems thereby leading to an overall increase in network throughput. Some of the popular protocols involve adjusting the carrier sensing threshold, replacing the omni directional antennas with directional antennas and intelligent calibration of transmission power. Studies have shown that directional antennas offer numerous advantages over omni directional antennas and thus has the potential to enhance the performance of ad hoc networks. For one, directional antennas have the ability to streamline their power in the direction of the receiver thereby offering longer transmission and reception ranges for the same amount of power. MAC layer protocols specifically designed to support such directional transmission and reception has been a current active area of research. Most of these protocols consider directional transmission under the assumption that the communication range of omni and directional antennas are the same. Apparently this assumption is not supported in any realistic situation. Moreover, the scientific community has not researched in depth the effect of topology on power consumption in ad hoc networks. In this thesis, we propose a cross-layer power optimization scheme for wireless ad hoc networks. The novelty of our work lies in the fact that we exploit the knowledge of the network topology to dynamically calibrate transmission power. The information about the network topology is retrieved from the Network Layer. Specifically, we consider three different network topologies -- (i) a sparse topology, (ii) a dense topology and a (iii) clusterbased topology. The MAC layer implements a dynamic power control scheme which regulates the transmission power of a transmitting node based on the node density at the receiver's end. In addition a transmitting node can adjust its own transmission power to the optimal level if the SINR value at the receiving node is known. Our cross-layer power control algorithm takes the above fact into account. Extensive simulation in NS2 shows that in all the three topologies our cross layer power control scheme (use of directional antennas with power control) leads to prolonged network lifetime and significantly increases the system throughput.
Book Synopsis Annual Review of Communications: Volume 59 by : International Engineering Consortium
Download or read book Annual Review of Communications: Volume 59 written by International Engineering Consortium and published by Intl. Engineering Consortiu. This book was released on 2007 with total page 740 pages. Available in PDF, EPUB and Kindle. Book excerpt: An indispensable reference publication for telecommunication and information-industry professionals. Each year, the IEC brings together into one unique resource the most current thinking and practical experience of industry leaders around the world on a variety of topics facing their areas of specialization. This 700+ page reference tool is a must for executives, managers, engineers, analysts, and educators in all sectors of today's changing information industry.
Book Synopsis AD HOC NETWORKS by : Prasant Mohapatra
Download or read book AD HOC NETWORKS written by Prasant Mohapatra and published by Springer Science & Business Media. This book was released on 2006-01-16 with total page 287 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis NETWORKING 2008 Ad Hoc and Sensor Networks, Wireless Networks, Next Generation Internet by : Amitabha Das
Download or read book NETWORKING 2008 Ad Hoc and Sensor Networks, Wireless Networks, Next Generation Internet written by Amitabha Das and published by Springer Science & Business Media. This book was released on 2008-04-25 with total page 965 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceedings of the 7th International IFIP-TC6 Networking Conference, NETWORKING 2008, held in Singapore, in May 2008. The 82 revised full papers were carefully reviewed and selected from numerous submissions for inclusion in the book. The papers are organized in topical sections on ad hoc and sensor networks: design and optimization, MAC protocol, overlay networking, and routing; next generation internet: authentication, modeling and performance evaluation, multicast, network measurement and testbed, optical networks, peer-to-peer and overlay networking, peer-to-peer services, QoS, routing, security, traffic engineering, and transport protocols; wireless networks: MAC performance, mesh networks, and mixed networks.
Book Synopsis Medium Access Control in Ad Hoc Networks with Omni-directional and Directional Antennas by : Yu Wang
Download or read book Medium Access Control in Ad Hoc Networks with Omni-directional and Directional Antennas written by Yu Wang and published by . This book was released on 2004 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: An ad hoc network is a dynamic network formed on demand by a group of nodes without the aid of any pre-existing network infrastructure. An efficient and effective medium access control (MAC) protocol which regulates nodes access to the shared channel(s) is essential in an ad hoc network. Our work is focused on the throughput and fairness properties of existing omni-directional MAC protocols as well as enhancement of their performance with directional antennas via both analytical and simulation approaches. In the first part, we present the first analytical modeling of collision avoidance MAC protocols including the popular IEEE 802.11 MAC protocol in multi-hop ad hoc networks. We show that in ad hoc networks with a lot of hidden terminals, collision avoidance even if done correctly, can still limit achievable throughput significantly because of the much reduced spatial reuse. Then we advance the analytical modeling to evaluate those MAC protocols which use directional antennas and can achieve much higher throughput through directing transmissions and receptions to desired directions only. We show that the gain in spatial reuse outweighs that of collision avoidance and hence an aggressive all-directional scheme is more advantageous than other hybrid schemes that take conservative (or unnecessary) tradeoff between collision avoidance and spatial reuse. All the analytical work has provided very useful insight on the interaction between spatial reuse, interference reduction and collision avoidance that previous work lacked.
Book Synopsis Quality of Service Aware Topology Control for Wireless Ad Hoc Networks Using Smart Antennas by : Sk. Mohammad Rokonuzzaman
Download or read book Quality of Service Aware Topology Control for Wireless Ad Hoc Networks Using Smart Antennas written by Sk. Mohammad Rokonuzzaman and published by . This book was released on 2010 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Adaptive Topology Control of Wireless Ad Hoc Networks Using Directional Antennas by : Chandra Sekhar V R N S. Poduri
Download or read book Adaptive Topology Control of Wireless Ad Hoc Networks Using Directional Antennas written by Chandra Sekhar V R N S. Poduri and published by . This book was released on 2009 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ad Hoc and Sensor Networks by : Carlos de Morais Cordeiro
Download or read book Ad Hoc and Sensor Networks written by Carlos de Morais Cordeiro and published by World Scientific. This book was released on 2011 with total page 663 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive yet easy coverage of ad hoc and sensor networks and fills the gap of existing literature in this growing field. It emphasizes that there is a major interdependence among various layers of the network protocol stack. Contrary to wired or even one-hop cellular networks, the lack of a fixed infrastructure, the inherent mobility, the wireless channel, and the underlying routing mechanism by ad hoc and sensor networks introduce a number of technological challenges that are difficult to address within the boundaries of a single protocol layer. All existing textbooks on the subject often focus on a specific aspect of the technology, and fail to provide critical insights on cross-layer interdependencies. To fully understand these intriguing networks, one need to grasp specific solutions individually, and also the many interdependencies and cross-layer interactions.
Book Synopsis Neighbor-aware Control in Ad Hoc Networks by : Lichun Luke Bao
Download or read book Neighbor-aware Control in Ad Hoc Networks written by Lichun Luke Bao and published by . This book was released on 2002 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ad hoc networks have very unique features, such as dynamic topologies, relatively limited bandwidth and wireless signal propagation schemes, which present difficult challenges for wireless communication. We propose control mechanisms for channel access scheduling and topology control in ad hoc networks, respectively, which utilize the neighborhood information within two hops to cope with the difficulties of communicating in ad hoc networks. First, we present the neighbor-aware contention resolution (NCR) algorithm, and analyze its generic performance with regard to the contention delay and system throughput. The required neighbor information in NCR for ad hoc networks is acquired through the neighbor protocol, which is based on a random channel access mechanism and a reliable message propagation scheme using retransmissions. Then, four channel access protocols based on NCR are presented, namely NAMA, LAMA, PAMA and HAMA, which correspond to node-, link-, pair- wise- and hybrid-activation multiple access protocols, respectively. These protocols are aimed at ad hoc networks with omnidirectional antennas, and their performance is analyzed. Furthermore, channel access protocols, adapted from NAMA and PAMA, are considered for heterogeneous ad hoc networks that include unidirectional links, which may occur due to power and signal propagation differences between wireless stations.
Book Synopsis Mobile Ad Hoc Networking by : Stefano Basagni
Download or read book Mobile Ad Hoc Networking written by Stefano Basagni and published by John Wiley & Sons. This book was released on 2004-10-07 with total page 479 pages. Available in PDF, EPUB and Kindle. Book excerpt: From physical issues up to applications aspects, Mobile Ad Hoc Networking comprehensively covers all areas of the technology, including protocols and models, with an emphasis on the most current research and development in the rapidly growing area of ad hoc networks. All material has been carefully screened for quality and relevance and reviewed by the most renowned and involved experts in the field. Explores the most recent research and development in the rapidly growing area of ad hoc networks. Includes coverage of ad hoc networking trends, possible architectures, and the advantages/limits for future commercial, social, and educational applications. Ad hoc networks have been an intense area of research and development but many products that fully utilize this technology are only now being widely deployed throughout the world.
Book Synopsis Energy-efficient Protocols for Wireless Ad Hoc Networks by : Kang Wang
Download or read book Energy-efficient Protocols for Wireless Ad Hoc Networks written by Kang Wang and published by . This book was released on 2004 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Broadcast Traffic in Ad Hoc Networks with Directional Antennas by :
Download or read book Broadcast Traffic in Ad Hoc Networks with Directional Antennas written by and published by . This book was released on 2003 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors explore the use of directional antennas to improve the performance of broadcasting in ad hoc networks. They investigate both the performance of unicast traffic in the presence of broadcast traffic, and the performance of broadcast traffic when mixed with unicast traffic, which is different from previous investigations reported in the literature in which broadcast traffic was investigated in isolation. Through extensive simulation experiments with three Medium Access Control (MAC) schemes, they show that throughput and delay can vary widely even in networks in which nodes are uniformly distributed. They also show that the use of a MAC protocol that utilizes directional antennas can help to improve the performance of broadcast traffic in ad hoc networks, in terms of both throughput and delay, through a more aggressive channel access scheme that maximizes spatial reuse.
Book Synopsis Simulation in Computer Network Design and Modeling: Use and Analysis by : Al-Bahadili, Hussein
Download or read book Simulation in Computer Network Design and Modeling: Use and Analysis written by Al-Bahadili, Hussein and published by IGI Global. This book was released on 2012-02-29 with total page 582 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This book reviews methodologies in computer network simulation and modeling, illustrates the benefits of simulation in computer networks design, modeling, and analysis, and identifies the main issues that face efficient and effective computer network simulation"--Provided by publisher.