PHD theses : Engineering

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Author: search.filters.author.Nadir Mohamed Abd Elaziz IbrahimSubject: search.filters.subject.Communications Engineering

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    Optimizing Reception Performance of UWB Signals in Multipath Fading Channels Using MMSE Adaptive Algorithms
    (Al Neelain University, 2015) Nadir Mohamed Abd Elaziz Ibrahim
    This thesis demonstrates the basics UWB technology , and explain s why it is a better candidate compared to most of the existing technologies in short - range high - speed communications, and then discusses the UWB transceiver system architecture, and shows the transmission characteristics and the Pulse shapes used for UWB communications. Followed by showing the UWB channel models used for the UWB Signals’ propagation, and specifically focusing on the IEEE 802.15.3a multipath channel model based on Sale h - Valenzuela channel models as one of most recent important and realistic Multi - path channel models in the wireless Communications today. Moreover, the thesis studies the utilization of a new UWB pulse shape which is the 6 th derivative Gaussian pulse and its performance using two major multiple access schemes used in UWB Communications; Direct - Sequence UWB (DS - UWB) and Time - Hopping UWB using Pulse - Position - Modulation technique (TH - PPM UWB), along with their data modulation methods. Finally, this thesis dem onstrates the design and operation characteristics of also two major reception techniques used in wireless communications generally and in UWB communications specifically; the Rake - receiver, and the Minimum - Mean Square - Error Receiver (MMSE receiver), more explicitly the thesis concerns about the MMSE receiver because its algorithm uses Adaptive filtering scheme with is very important and helpful for detecting the UWB signals in the Multi - path Fading channels suggested in the thesis. The thesi s mostly foc uses on comparing between the performance of the DS - UWB and TH - PPM UWB as two different transmission schemes over the UWB Multi - path fading channel utilizing the Rake - receiver technique, and the MMSE - receiver algorithm with adaptive filtering technique uti lizing t he newly introduced UWB pulse shape ( Gaussian 6 th derivative pulse ); unlike most of the published literature which used the 2 nd derivative Gaussian pulse. The simulation tool which will be used in the thesis is MATLAB 201 3 . a and MATLAB 201 3 . b with the help of S IMULINK Libraries to show the better detection performance of MMSE receiver utilizing a daptive algorithms for UWB signals in IEEE 802.15.3 multipath channel model which is recommended for sensitive communications applications due to the compl exity of the sys tem .