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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.
Search results
Showing 121 to 130 of 3005 (0.01 seconds)| 121 |
A set theoretic approach to broadcast encryptionMartin, Thomas January 2005 (has links)
No description available.
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| 122 |
Error protection and security for data transmissionAmmar, Bassem AbuBakr January 2004 (has links)
No description available.
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| 123 |
Analysis of multiple-input multiple-output wireless communication systems in cochannel interferenceWebb, Matthew William January 2006 (has links)
No description available.
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| 124 |
Stochastic approximations for reduced complexity signal processing algorithms in MIMO wireless communicationsJia, Yugang January 2007 (has links)
No description available.
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| 125 |
Multiple description video coding for robust transmission over unreliable networkWang, Dong January 2006 (has links)
No description available.
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| 126 |
Channel modelling for urban multi-hop/ad hoc networksWang, Zhenyu January 2007 (has links)
No description available.
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| 127 |
Performance of OFDM based multimedia wireless local area networks, with and without antenna sectorisationDoufexi, Angela January 2002 (has links)
No description available.
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| 128 |
Topics in the design of digital transmission systemsBates, R. J. S. January 1980 (has links)
No description available.
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| 129 |
Improving signaling performance of proactive MANET routing protocolsHuang, Yangcheng January 2007 (has links)
No description available.
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| 130 |
Fast orthogonal frequency division multiplexing (Fast-OFDM) for wireless communicationsLi, Kai January 2008 (has links)
This thesis presents research that has addressed various design issues related to an adapted orthogonal frequency division multiplexing scheme, namely Fast-OFDM. A comparative study of the system with conventional OFDM in various signal mapping conditions has been investigated. The thesis reports on performance assessment in terms of bit-error-rate (BER) performance, spectral efficiency, peak-to-average-power ratio (PAPR), nonlinear effects and adjacent channel interference (ACI) analysis. The results show that the performance of Fast-OFDM is comparable to OFDM for single dimensional modulation scheme, whereas for complex modulation schemes, the performance of Fast-OFDM degrades severely due to the loss of orthogonality between subcarriers. Two multi-carrier CDMA schemes, multi-carrier direct sequence CDMA (MC DS-CDMA) and multi-tone CDMA (MT-CDMA), have been studied in different modulation scenarios. The performance of the overlapping multi-carrier CDMA schemes compared to OFDM and Fast-OFDM has been evaluated in terms of BER, spectral efficiency, PAPR and ACI analysis. The results reveal that the overlapping multi-carrier CDMA systems are comparable to the Fast-OFDM system under single user condition. It is thus feasible to apply multi-carrier CDMA detection techniques in Fast-OFOM systems. Therefore, two different types of linear detectors, zero-forcing (ZF) and minimum mean square error (MMSE) have been employed in complex modulated Fast-OFDM, leading to improvement of system performance. Overall, the theoretical design and performance assessment issues addressed in this thesis provide an insight into the performance of Fast-OFDM in the presence of additive white Gaussian noise (AWGN). The results obtained can be used by receiver designers for improving signal recovery of complex modulated Fast-OFDM in future wireless communication systems.
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