SDMA-Based MAC Protocol for Wireless Ad Hoc Networks with Smart Antennas PDF Download
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Languages : en
Pages : 0
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Author:
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Languages : en
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Author: Yu Xin Pan
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Languages : en
Pages : 0
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Use of directional antennas in wireless networks has been widely studied in recent years. Since the Medium Access Control (MAC) protocol of the IEEE 802.11 standard is designed for the use of omnidirectional antennas, it cannot work properly when directional antennas are used. To maximize the system throughput in mobile ad hoc networks, one needs to design new MAC protocols that work well with directional antennas. In this thesis, we propose a new MAC protocol that can efficiently utilize the large throughput offered by directional antennas in ad hoc networks. The proposed MAC protocol makes use of two main modes; (i) omnidirectional mode where one antenna is used for the transmission of users' control frames, and (ii) directional mode where antenna arrays are used for the transmission of data frames. We define two separate channels, one for control information and the second for data transmission. We incorporate a simple routing protocol to deal with the out-of-range problem encountered in practical scenarios. The proposed protocol takes into consideration the effect of interference arising from the side-lobes of different stations. Using a practical ad hoc network model, we present performance comparisons with different MAC protocols (including the IEEE 802.11) where we show the large throughput gains achieved using the proposed MAC protocol.
Author: Ruay-Shiung Chang
Publisher: Springer Science & Business Media
ISBN: 3642354521
Category : Technology & Engineering
Languages : en
Pages : 721
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Book Description
The field of Intelligent Systems and Applications has expanded enormously during the last two decades. Theoretical and practical results in this area are growing rapidly due to many successful applications and new theories derived from many diverse problems. This book is dedicated to the Intelligent Systems and Applications in many different aspects. In particular, this book is to provide highlights of the current research in Intelligent Systems and Applications. It consists of research papers in the following specific topics: l Graph Theory and Algorithms l Interconnection Networks and Combinatorial Algorithms l Artificial Intelligence and Fuzzy Systems l Database, Data Mining, and Information Retrieval l Information Literacy, e-Learning, and Social Media l Computer Networks and Web Service/Technologies l Wireless Sensor Networks l Wireless Network Protocols l Wireless Data Processing This book provides a reference to theoretical problems as well as practical solutions and applications for the state-of-the-art results in Intelligent Systems and Applications on the aforementioned topics. In particular, both the academic community (graduate students, post-doctors and faculties) in Electrical Engineering, Computer Science, and Applied Mathematics; and the industrial community (engineers, engineering managers, programmers, research lab staffs and managers, security managers) will find this book interesting.
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: 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: Sultan Budhwani
Publisher:
ISBN:
Category :
Languages : en
Pages : 44
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Using directional antenna in ad hoc networks, offer many benefits in contrast to their classical omni-directional counterparts. The most important benefits are the significant improvement in spatial reuse, reduction of the radio interference, increase in coverage range and subsequently an increase in network capacity on the whole. On the other hand, directional transmission increases the hidden terminal problem and the problem of deafness. To best utilize directional antennas, a suitable Medium Access Control (MAC) protocol must be designed. Current MAC protocols, such as the IEEE 802.11 standard for Wireless LANs, assume the omni-directional antenna at its Physical layer and thus do not fully exploit the capabilities of a directional antenna. In this thesis, we propose a MAC protocol for wireless ad hoc networks which fully exploits the potentials of directional antennas. The first part of our design studies the issues related to directional MAC protocols and we use this knowledge to carefully design the proposed MAC protocol for ad hoc networks using directional antennas. We evaluate our work through simulation studies performed on the network simulator - NS2. Numerical results obtained are promising and show that our protocol offers significant improvement in throughput when compared to the performance of traditional 802.11 MAC protocol and D-MAC which is a Directional MAC protocol for ad hoc networks.
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: Yi-Sheng Liu
Publisher:
ISBN:
Category : Bluetooth technology
Languages : en
Pages :
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Author: Liqun Fu
Publisher: Springer Nature
ISBN: 3031572963
Category :
Languages : en
Pages : 158
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Author: Yogesh Ratnaparkhi
Publisher:
ISBN:
Category : Computer networks
Languages : en
Pages : 106
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Book Description
