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 37 for “"1005 Communications Technologies"”.
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Co-channel interference cancellation in mobile cellular communication systems
In recent years, mobile communications has become very popular and the demand for its services has increased dramatically. The capacity of mobile communication systems is mainly limited by co-channel interference caused by frequency reuse. The acceptable co-channel interference at the receiver …
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Optical fibre surface plasmon resonance sensors based on a metallic array of sub-wavelength apertures
… index (RI) as compared to cheaper existing technologies.
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Interference mitigation in colocated wireless systems
The placement of base station transceivers at close proximity to one another is a major challenge for RF engineers. In a colocated setting, the base station receivers have to receive weak desired signals in the presence of high-power transmit/jamming signals from colocated base station …
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Developed mechanisms for cross-tier and co-tier interference avoidance in femtocell networks
To deal with the increasing demand of high speed data streaming and good quality voice traffic from mobile users at home, Femtocell Networks are deployed in homes that enables an indoor mobile user to achieve high speed downloading from the internet and make good quality voice calls. A femtocell …
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A local area network using spread spectrum techniques
Local Area Networks (LANs) have become fairly common in recent years. This thesis considers the application of Spread Spectrum (SB) communication techniques to the implementation of a LAN.
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Reliable satellite broadcast transmission: protoccol design, simulation and analysis
… Australia's Bureau of Meteorology, and on Optus Communications' Omnicast Digital satellite service. Protocols commonly used for point-to-point satellites transmission were analysed—mainly to identify protocol procedures that inhibit good performance over a satellite link.
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Digital image compression on parallel computer architectures
Main aim of this project is to investigate the application of parallel processing techniques to digital image compression. Digital image compression is used to reduce the number of bits required to store an image in computer memory and/or transmit it over a communication link. Over the past decade …
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Outage performance of cooperative cognitive relay networks
This thesis considers the incorporation of cooperative relays into a cognitive radio network. Cognitive radio is a potential solution to the growing scarcity of radio spectrum and the increased demand for wireless services. Cooperative relay networks can help cognitive radios to improve their …
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Quality of service management for multimedia communications : investigations on usability of interfaces for desktop and portable systems
… of Service (QoS) requests. However, these technologies often fall short of user expectations by not providing effective user interfaces that can facilitate negotiations between the user and the system. In this thesis, a set of conceptual models are developed to create a user-centred QoS …
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Handover in digital cellular mobile communication systems
A mathematical formulation is developed for systematic tracking of the random movement of a mobile station in a cellular environment. It incorporates mobility parameters under generalized conditions, so that the model could be tailored to be applicable in most cellular environments. This model is …
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A digital signal processing solution for multichannel base stations
Radio communication systems of the future will require a large increase in user capacity. To achieve this, cell sizes will reduce and the number of base stations will increase. Current base station architectures use analogue combining techniques which are expensive, voluminous and inflexible. This …
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Peak power reduction in orthogonal frequency division multiplexing transmitters
… the increasing demand for higher data rates in communications which can be used in both wired and wireless environments. This thesis describes the issue of the Peak to Average Power Ratio (PAPR) in OFDM which is a major drawback, and presents new and variations to existing algorithms to reduce …
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Optical fibre refractive index, voltage and strain sensors : fabrication and applications
The focus of this thesis is the study of intensity and wavelength-based optical fibre sensors (OFSs) for various applications in three major sensing areas: refractive index (RI), voltage and strain. The thesis aims to provide detailed information on the design and performance of particular …
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Spectrum sharing in cognitive radio networks
Years of growth in wireless communication services and conservative spectrum allocation policies by government regulators have led to spectrum scarcity. On the other hand, spectrum measurement campaigns have indicated that the actual occupancy of most licensed frequency bands is quite low. In …
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Opportunistic resource allocation and relaying methods for quality of service in the downlink of future cellular wireless networks
Wireless communications is on the brink of a major change. New technologies called multiple antenna systems (MIMO) and orthogonal frequency division multiple access (OFDMA) will be put together in the deployment of the next generation of cellular standards known as 4G. Consumers can expect peak …
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Microscopic and spectral characterisation of optical Fibre Bragg gratings
… in lasers, amplifiers, signal filtering in telecommunications and sensing. The underlying mechanisms and fundamental properties of FBGs are not completely understood, which stands in the way of full exploitation of FBG-based devices across a range of technologies. Differential Interference …
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Performance analysis of relay based cooperative MAC protocols
This thesis aims at contributing to the field of cooperative AHNs. The focus of this research is on the relay based MAC layer: design of cooperative MAC protocols, performance modelling, and protocol enhancements. The first contribution of this thesis is dedicated to the modelling of energy …
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A digital up-conversion architecture for future high efficiency wireless base stations
… there has been a growing need for wireless communications with higher data rates and ubiquitous coverage, and these must be achieved at reduced cost and with a lower carbon footprint. This evolution in wireless demand places a big burden on transmitter architectures. The need for higher …
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Fuzzy technology application for mobile positioning in cellular communication
… the utilization of fuzzy logic in mobile communications systems is recent and limited. Understanding general mobile communications is essential in order to go on and develop a mobile positioning application. The successful applications of Fuzzy Logic Control (FLC) techniques in many areas …
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Smart card application design
This study investigated sociotechnical criteria in the design and specification processes of smart card based projects through a case study. The adoption of the innovations in the case study was investigated. The study consisted of three phases: analysis, design and implementation. These were in …
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