Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 34 for “"ad hoc wireless networks"”.
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Energy efficiency in ad-hoc wireless networks
In ad-hoc wireless networks, nodes are typically battery-powered, therefore energy limitations are among the critical constraints in ad-hoc wireless networks' development. The approaches investigated in this thesis to achieve energy efficient performance in wireless networks can be grouped into …
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Cooperation enforcement in ad-hoc wireless networks
Ad-hoc networks consist of a system of wireless nodes that can freely and dynamically self-organise into a working network topology. This allows people to internetwork seamlessly in areas that have no preexisting communication infrastructure. Nodes are expected to forward the traffic of other nodes …
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Reliable Multicast in Mobile Ad Hoc Wireless Networks
A mobile wireless ad hoc network (MANET) consists of a group of mobile nodes communicating wirelessly with no fixed infrastructure. Each node acts as source or receiver, and all play a role in path discovery and packet routing. MANETs are growing in popularity due to multiple usage models, ease of …
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Optimal scheduling algorithms for ad hoc wireless networks
… scheduling algorithm is throughput-optimal in wireless networks. However, its complexity is exponential in the number of links in an ad hoc network. In this work, we consider a greedy variant of the MaxWeight algorithm, called Longest Queue First (LQF). A synchronous version of LQF is known to …
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Multiple-antenna systems in ad-hoc wireless networks
The increasing demand for wireless communication services has resulted in crowding of the electromagnetic spectrum. The "spectral-commons" model, where a portion of the electromagnetic spectrum is public and used on an ad-hoc basis, has been proposed to free up spectrum that has been allocated but …
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Interference and power control in ad hoc wireless networks
… is applied to maximize the network capacity. In ad hoc networks, the RTS/CTS dialog or virtual carrier sensing is less effective since a transmission takes place over three ranges: interference range, carrier sense range and transmission range. The values of interference range do not interrupt a …
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An improved MultiAnts-Aodv routing protocol for ad hoc wireless networks
Compared to the conventional table-driven and on-demand routing protocols, a hybrid routing protocol [71], which uses mobile agents and reactive route discovery, introduced a more realistic solution to this problem. However, the mobile agents were not fully exploited in this protocol. In this …
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Multicast outing protocols and architectures in mobile ad-hoc wireless networks
… services. The emerging group communication wireless applications, such as multipoint data dissemination and multiparty conferencing tools have made the design and development of efficient multicast techniques in mobile ad-hoc networking environments a necessity and not just a desire. …
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Power conservation and performance analysis of mobile ad hoc wireless networks
Mobile ad-hoc network (MANET) have emerged as a new systems and the most promising fields for research and development of wireless network. As the popularity of mobile device and wireless networks significantly increased over the past years, MANET has now become one of the most vibrant and active …
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An augmentation algorithm for improving longevity in ad hoc wireless networks
… an investigation into improving the longevity of wireless ad hoc networks. The primary contribution of this study is an augmentation algorithm that takes a two-dimensional network arrangement. and systematically adds augmented nodes to create a bi-connected topology. Simulations were run to …
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Implementation of a power-saving protocol for ad hoc wireless networks
… implementation of a power-saving protocol for ad hoc wireless networks. We present the Span power-saving protocol and discuss its implementation in the context of the Linux operating system. We address the issues of ad hoc routing, link layer design, and integration with the Linux networking …
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A cooperative communication protocol for wireless ad-hoc networks
… efficiently transfer data. Multi-hop routing in ad-hoc wireless networks realizes some scalability benefits over direct transmission by utilizing cooperation in the network layer, where all nodes act as routers to relay messages. Cooperative transmission takes this idea a step further, moving …
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Distributed construction of energy-efficient ad hoc wireless broadcast trees
We address the energy-efficient broadcasting problem in ad hoc wireless networks. First we show that finding the minimum energy broadcast tree is NP-complete and develop an approximation algorithm, which computes sub-optimal solutions in polynomial time. We present a distributed algorithm that …
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Novel approaches to performance evaluation and benchmarking for energy-efficient multicast: empirical study of coded packet wireless networks
With the advancement of communication networks, a great number of multicast applications such as multimedia, video and audio communications have emerged. As a result, energy efficient multicast in wireless networks is becoming increasingly important in the field of Information and Communications …
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Quality-aware voice convergecast in mobile low power wireless networks
… voice communication for mobile users. Low power ad hoc wireless networks have become a promising alternative for voice communication in emergency scenarios because of their low cost and portability. In order to increase communication amongst moving emergency personnel and disaster victims, we …
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Backpressure Policies for Wireless ad hoc Networks
Interference in ad hoc wireless networks causes the performance of traditional networking protocols to suffer. However, some user applications in ad hoc networks demand high throughput and low end-user delay. In the literature, the backpressure policy, i.e. queue backlog differential-based joint …
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Throughput Optimization and Transmitter Power Saving (TOTPS) Algorithm and Extended TOTPS (ETOTPS) Algorithm for IEEE 802.11 Links
The IEEE 802.11 wireless local area network (WLAN) standard supports multiple transmission modes. However, the higher mandatory data rate mode does not necessarily yield higher throughput. This research started from the relationship between the link throughput and the channel's carrier-to-noise …
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An Investigation of a Theoretical Zigbee-Based Border Crossing System
… crossings threaten the mobility of people and trading of goods. The management of transportation infrastructure generally requires continuous and real-time monitoring, formulation, and dissemination of information and guidance to motorists and other parties. This thesis proposes and studies a …
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Dynamic power allocation and routing for satellite and wireless networks with time varying channels
Satellite and wireless networks operate over time varying channels that depend on attenuation conditions, power allocation decisions, and inter-channel interference. In order to reliably integrate these systems into a high speed data network and meet the increasing demand for high throughput and …
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Proactive mobile wireless networks : an infrastructureless wireless network architecture for delay-sensitive applications
Infrastructureless wireless networks are an important class of wireless networks that is best suited for scenarios where there is temporary and localized telecommunication demand. Such networks consist of wireless devices that can form a network autonomously without the need for pre-deployed …
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