Spelling suggestions: "subject:"[een] ADAPTIVE"" "subject:"[enn] ADAPTIVE""
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Simulation of Adaptive Array Algorithms for OFDM and Adaptive Vector OFDM SystemsCheung, Bing-Leung Patrick 04 September 2002 (has links)
The increasing demand for high data rate services necessitates the adoption of very wideband waveforms. In this case, the channel is frequency-selective, that is, a large number of resolvable multipaths are present in this environment and fading is not highly correlated across the band. Orthogonal frequency division multiplexing (OFDM) is well-known to be effective against multipath distortion. It is a multicarrier communication scheme, in which the bandwidth of the channel is divided into subcarriers and data symbols are modulated and transmitted on each subcarrier simultaneously. By inserting guard time that is longer than the delay spread of the channel, an OFDM system is able to mitigate intersymbol interference (ISI). Deploying an adaptive antenna array at the receiver can help separate the desired signal from interfering signals which originate from different spatial locations. This enhancement of signal integrity increases system capacity. In this research, we apply adaptive array algorithms to OFDM systems and study their performance in a multipath environment with the presence of interference. A novel adaptive beamforming algorithm based on the minimum mean-squared error (MMSE) criterion, which is referred to as frequency-domain beamforming, is proposed that exploits the characteristics of OFDM signals. The computational complexity of frequency-domain beamforming is also studied. Simulation results show employing an adaptive antenna array with an OFDM system significantly improves system performance when interference is present. Simulations also show that the computational complexity of the algorithm can be reduced by half without significant performance degradation. Adaptive array algorithms based on the maximum signal-to-noise ratio (MSNR) and the maximum signal-to-interference-plus-noise ratio (MSINR) criteria are also applied to adaptive vector OFDM systems (AV-OFDM). Simulation results show that the adaptive algorithm based on the MSNR criterion has superior performance in the multipath environment but performs worse than the one based on the MSINR criterion under the flat fading channel. / Master of Science
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Uniform concentric circular and spherical arrays with frequency invariant characteristics: theory, design andapplicationsChen, Haihua., 陳海華. January 2006 (has links)
published_or_final_version / abstract / Electrical and Electronic Engineering / Doctoral / Doctor of Philosophy
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Adaptive estimation theory with real-time implementationVishwanath, T. G. January 1987 (has links)
No description available.
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Walsh functions for the identification and control of nonlinear plantsHarkness, John January 1995 (has links)
No description available.
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Investigations into a minimal controller synthesis algorithmBenchoubane, H. January 1991 (has links)
No description available.
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The MCS algorithm for the co-ordinated control of web tension and transportDye, M. G. January 1995 (has links)
No description available.
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Soft computing : a fuzzy logic controlled genetic algorithm environmentMcClintock, Shaunna January 1999 (has links)
No description available.
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Imitation and solving the correspondence problem for dissimilar embodiments : a generic frameworkAlissandrakis, Aris January 2003 (has links)
No description available.
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Wideband adaptive full response multilevel transceivers and equalizersWong, Choong Hin January 1999 (has links)
No description available.
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Power control for a mobile satellite systemMehta, Mehul January 1998 (has links)
No description available.
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