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 13 of 13 for “"Centre for Telecommunications and Micro-Electronics (CTME)"”.
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Optical fibre refractive index, voltage and strain sensors : fabrication and applications
… 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
… 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 recent …
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Opportunistic resource allocation and relaying methods for quality of service in the downlink of future cellular wireless networks
… 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 data rates up to 160 Mbps. If the user is to have a good network …
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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
… layer: design of cooperative MAC protocols, performance modelling, and protocol enhancements. The first contribution of this thesis is dedicated to the modelling of energy consumption which aids MAC protocol developers in the design phase to devise efficient protocols and energy saving …
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Channel assignment strategies for throughput enhancement in high density wireless local area networks
… years is a testament to both the insatiable demands for wireless broadband services and the ubiquity of WLAN technology. The increased density of WLAN deployments brings with it the potential of increased capacity, extended coverage and exciting new applications. On the other hand, however, the …
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A digital up-conversion architecture for future high efficiency wireless base stations
… past few years, 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 …
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Characterisation of optical fibre amplifiers: amplifiers for the 632.8 nm He-Ne wavelength in praseodymium-doped ZBLAN
… determined independently of the gain and used to model the performance of the amplifier.
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Low coherence fibre interferometry with a multi-wavelength light source
… coherence fibre interferometry. The development and performance of the all-fibre interferometric measurement systems utilising multi-wavelength combination sources are described. Principal aspects of the low-coherence sensor interrogation scheme are analysed in order to substantiate the …
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Lidar and infrared radiometer studies of stratocumulus clouds
… clouds measured by ground-based Lidar and Infrared RADiometry (or LIRAD). The clouds were measured in northwestern Tasmania in the winter of 1993 and summer of 1995 during the Southern Ocean Cloud Experiment (SOCEX). The study done for this thesis represents the first application of the …
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Microscopic characterisation of fibre Bragg gratings
The focus of this thesis is the study of microscopic characterization of optical fibres and fibre Bragg gratings, by the use of a non-invasive microscopic technique, namely differential interference contrast microscopy. The thesis aims to provide detailed information on the structural and optical …
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Wideband propagation measurements for personal communication systems
… pronounced, causing small scale fading in narrowband channels, and inter-symbol interference in wideband systems because of delay spread in the channel impulse response. Multipath propagation becomes more pronounced as the wavelength decreases, and at the frequencies around 2GHz assigned for 3rd. …
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Multiple input multiple output channel measurements and system performance
… a single antenna element at the transmitter and receiver are heavily influenced by the multipath scattering arising from objects in the transmission environment. Unlike conventional systems, a concept referred to as Multiple-Input Multiple-Output or MIMO not only thrives under multipath …