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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Modelling and performance assessment of OFDM and fast-OFDM wireless communication systemsKarampatsis, Dimitrios January 2004 (has links)
This thesis is mainly concerned with the design, modelling and performance assessment of modulation techniques for use in wireless communication systems. The work is divided, broadly in three areas; a multimode system proposal, an assessment of a new modulation scheme and a system optimisation technique. A multimode system architecture employing GSM and EDGE systems and an Orthogonal Frequency Division Multiplexing (OFDM) system is proposed. The OFDM system is designed to have similar frame structure, channel allocation and spectrum shape to those of the GSM and EDGE systems. The multimode system is evaluated under typical multipath fading environments specified for GSM/EDGE and adjacent-channel and co-channel interference. The results indicated that the proposed OFDM system can be perfectly integrated within the GSM/EDGE network core. Furthermore, a novel modulation technique is investigated. Fast-OFDM (FOFDM) is a variation of OFDM, which offers twice the bandwidth efficiency when compared to OFDM. However, the bandwidth efficiency only applies to one dimensional modulation schemes (BPSK or M-ASK). The suitability of FOFDM for wireless communications is assessed by studying its performance under receiver front-end distortions and multipath fading environments. The performance of the FOFDM system is compared with the performance of a similar OFDM system. The results indicated that under small distortion conditions, the performance of FOFDM and OFDM is comparable. Finally, the effect of interpolation filtering on OFDM systems in noise limited and interference limited environments is investigated. The aim of this study is to highlight that interference should be taken into consideration when designing systems for wireless communications. In addition, this study can be utilised in software defined radio schemes, offering optimised performance. Overall, this thesis presents work over a range of research areas, providing system proposals, modulation comparisons and system optimisation techniques that can be used by developers of future mobile systems.
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Realization of the standard of sound pressure through the calibration of half-inch laboratory standard condenser microphonesJarvis, Duncan Robert January 1989 (has links)
No description available.
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Novel TDE demodulator and kernal-PCA denoising algorithms for improvement of reception of communication signalKoutsogiannis, Grigorios January 2004 (has links)
No description available.
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Adaptive nonlinear equaliser structures for intersymbol and co-channel interference suppressionPaterson, Gavin John January 2006 (has links)
No description available.
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The radio spectrum requirements of broadband power line telecommunications systemsBrannon, Raymond James January 2005 (has links)
No description available.
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Performance analysis of wireless communications systems in fading channelsLiu, Xiang January 2006 (has links)
No description available.
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Enhanced signal coding using stochastic resonance with application to the auditory systemDas, Aruneema January 2006 (has links)
No description available.
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Bayesian non-linear blind signal separationWei, Chen January 2007 (has links)
No description available.
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Internal model adaptive controlOram, Paul January 2004 (has links)
No description available.
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Detection and carrier recovery algorithms for CDMA systems in impulsive noise environmentsFa, Rui January 2007 (has links)
No description available.
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