Telephony (VoIP) and Wireless Localisation over Mobile Ad Hoc Networks

Hui Zhang (2010). Telephony (VoIP) and Wireless Localisation over Mobile Ad Hoc Networks , School of Information Technology and Electrical Engineering, The University of Queensland.

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Author Hui Zhang
Thesis Title Telephony (VoIP) and Wireless Localisation over Mobile Ad Hoc Networks
School, Centre or Institute School of Information Technology and Electrical Engineering
Institution The University of Queensland
Publication date 2010-07
Supervisor Professor Marek Edward Bialkowski
Dr. Garry Einicke
Dr. John Patrick Homer
Total pages 210
Total colour pages 27
Total black and white pages 183
Subjects 08 Information and Computing Sciences
Abstract/Summary With technological advancement, wireless networking has become an attractive technology to suit various communication purposes of modern society. Because of inherent flexibility, mobile ad hoc network (MANET), being one kind of wireless network, has gained huge popularity. The major challenge to mobile ad hoc network is caused by infrastructureless, multi-hop and topologically dynamic features, which are quite different to infrastructure wireless networks. The unpredictable characteristics associated with mobility bring a number of challenges in applications of MANETs. This thesis seeks to address current issues associated with voice over Internet protocol (VoIP) and node localisation using on the MANET platform. In the first part, this thesis investigates the quality and performance issues with respect to real-time voice packets transmission over MANET. It is shown that the real-time voice communication exhibits poor performance on multi-hop IEEE802.11b MANET using currently available protocols. In order to improve the quality of service (QoS) of VoIP in MANET, a new route-discover strategy based on the existing Ad-hoc On-Demand Distance Vector (AODV) protocol is proposed in this thesis. The newly proposed protocol, named here as extended AODV (EAODV), employs a new metric to discover more stable routings. The use of this new metric permits more efficient use of idle channel routings as well as reducing the adverse effects of channel interference and congestion. The validity of these new strategies greatly enhancing VoIP performance in ad hoc networks has been demonstrated by extensive computer simulations performed using Network Simulatior-2 (NS-2). In the second part, the thesis proposes the use of double time difference of arrival (DTDOA) data fusion method to locate the wireless nodes in MANET. The DTDOA method is a time-based location estimation method, and relies on measuring the difference in time at which two data packets arrive at multiple receiver nodes. The advantage of this approach is that it overcomes the requirement of the network synchronization problem on which some earlier proposed methods relied on. Its other advantage is high time resolution in measurement leading to a more accurate node location. As a result, the proposed approach is suitable for network-based location, especially for mobile ad hoc networks. Its validity is demonstrated in Line of Sight (LOS) and non-Line of Sight (NLOS) environments. The proposed method is capable of estimating the node location very accurately in MANET without carrying out complicated computations. In addition, a Kalman tracking algorithm is proposed to improve the results for static node location as well as to predict a mobile node trajectory. The Kalman filter which is used in the proposed algorithm estimates the mobile node track directly from the DTDOA measurement. Hence it represents a further enhancement of the DTDOA method in application to mobile ad hoc networks.
Keyword mobile ad hoc network (MANET), extended AODV (EAODV), voice over Internet Protocol (VOIP), wireless localisation, double time difference of arrival (DTDOA), Kalman filter
Additional Notes Pages should be printed in colour: 25, 93, 104, 111, 112, 117, 118, 120, 121, 131, 135, 139, 141-143, 151, 168, 172, 175, 178-182, 188-190

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Created: Tue, 05 Apr 2011, 13:50:16 EST by Mr Hui Zhang on behalf of Library - Information Access Service