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No description available.

During the last decade, the demand for ubiquitous data access and spontaneous data exchange has increased significantly and with predictions to grow even further in the future. To satisfy such increasing demand, new protocols, standards and products addressing wireless networking have emerged. Mobility often implies the need for easy and fast deployment without any prior notice or any underlying infrastructure and with little or no administrative effort. This kind of self-organising mobile network is called an ad hoc network (AHN) or mobile ad hoc network (MANET). A mobile ad hoc network (MANET) is an attractive solution when it is not feasible to set up a fixed network infrastructure due to time or monetary constraints, eg. historical, and disaster sites or military operations. Another application field is in spontaneous self-organisation of mobile entities, such as for logistics, traffic control and conference. / This thesis is mainly focused on performance analysis and performance improvement of ad hoc networks. Based on these themes, we identify that congestion is one of the most important factors degrading the performance of ad hoc networks. We then propose a multi-path routing protocol with load balance policy which reduces the network congestion and hence improves the network performance significantly. The protocol is also shown, using simulation, to achieve a lower average end-to-end packet delay. We also propose a comprehensive theoretical framework modelling the overheads, congestions, connection throughput and average packet delay. The theoretical framework is shown to be consistent with the simulation results. It is also important to emphasise that the framework allows us to select routes that guarantee a better performance. They can also indicate in the first place whether for a particular network, using multi-path routing will bring any improvement. Next, we carry out a literature review on the performance of TCP in ad hoc networks. Despite its good performance in wired networks, TCP has been shown to perform very badly in ad hoc networks. It is mainly caused by high packet loss rate due to link breakage and channel errors. We propose a new coding technique which reduces the packet loss rate and thus improves the network performance. We also study the impact of wireless channels in ad hoc networks. The study leads to an innovative cross layer design, employing the predictability of the Rayleigh wireless channel, to improve the performance of ad hoc networks. In order to study the cross layer design analytically, we propose new comprehensive theoretical models for the IEEE 802.11 medium access control protocol (MAC) and the Rayleigh channel. BY combining these two models, we are able to analyse the cross layer design in detail. It is expected that this framework will motivate future theoretical studies of ad hoc networks. / Thesis (PhDTelecommunications)--University of South Australia, 2005.

Thesis (PhDTelecommunications)--University of South Australia, 2002.

Bibliography: leaves 203-219. / 226 leaves : ill. ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Develops efficient analytical methodologies for multimedia traffic integration and improved design tools to enhance data performance. The call admission control policies proposed are not only able to enhance traffic performance but also maintain communication quality at an acceptable level. In particular, the multiple priority scheme is a promising technique for the control of packet congestion in a high-speed wireless multimedia environment. / Thesis (Ph.D.)--University of Adelaide, Dept. of Electrical and Electronic Engineering, 2000?

This thesis presents an analysis of the Modified Cramer Rao Bound (MCRB) for synchroniser performance in burst mode communication applications. This is accomplished by introducing the topic of burst mode communications and its practical applications, discussing the importance of synchronisation, presenting a model through which the mathematical analysis of this thesis is based upon, deriving a set of equations which can be used to calculate the MCRB and finally by performing various calculations of the MCRB with different parameters to examine their effects on the MCRB. The methods presented in this thesis are different from those presented in existing literature, which generally do not address the issue of burst mode synchronisation directly. The differences between the methods presented in this thesis and those of existing literature is also discussed.

Thesis (Ph. D.)--Ohio State University, 2008. / Title from first page of PDF file. Includes bibliographical references (p. 200-208).

Thesis (Ph.D.)--University of Adelaide, Dept. of Electrical and Electronic Engineering, 2000? / Bibliography: leaves 203-219.

Thesis (Ph.D.)--University of Wollongong, 2007. / Typescript. Includes bibliographical references: leaf 189-204.

Thesis (Ph.D.)--University of Delaware, 2009. / Principal faculty advisor: Keith W. Goossen, Dept. of Electrical & Computer Engineering. Includes bibliographical references.