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 16 of 16 for “"Multipath environment"”.
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Characterization of the Multipath Environment of Ionospheric Scintillation Receivers
… amplitude and phase. These errors are known as multipath errors and can lead to cycle slip and loss of lock on the satellite or degradation in the accuracy of position determination. High elevation cut off angles used for filtering GNSS signals, usually 15-30°, can reduce non-ionospheric …
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A matched field processing approach to long range acoustic navigation
… navigation system for use in a time-varying high-multipath environment. The system uses a ray tracing model of sound propagation in a horizontally stratified ocean to associate each multipath arrival with a particular ray path through the ocean. This ray path identification allows an inversion for …
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Simulation of Adaptive Array Algorithms for OFDM and Adaptive Vector OFDM Systems
… 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, …
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Dynamic collision reduction protocol for ultra-wide bandwidth multiple access networks
… ultra-wide bandwidth (UWB) signaling in a dense multipath environment with delay uncertainty. The detector takes advantage of the inherent multipath diversity associated with UWB signaling. We then develop an effective distributed control policy, derived from a dynamic programming formulation, to …
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Simulation of Adaptive Array Algorithms for CDMA Systems
… timing offset case, frequency offset case, and multipath environment). It is also shown that these two algorithms have less complexity and can converge faster than the other algorithms.
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Multiple-Target Tracking in Complex Scenarios
… themselves are moving in a</p><p>time-varying multipath environment. We develop a sparse-measurement model that allows us to exploit the inherent joint delay-Doppler diversity offered by the environment. We then reformulate the problem of MTT as a</p><p>block-support recovery problem using the …
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3D echo cancellation in a home environment
… for the cancellation of echoes in a home environment, where the room impulse response is unknown and variable. The general problem, where the speaker's movements are completely unrestricted, is a very hard one, and research in this area has only begun in the last several years. Therefore, …
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GNSS pre-correlation waveform feature extraction methods for multipath-afflicted signal classification
… is to propose and test novel algorithms for GNSS multipath environment classification on the receiver Digital Signal Processing (DSP) stage, but at an earlier processing point than it is used usually; at the generation of the digitized samples of the RF signal. Towards this direction, a detailed …
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Localization of Dynamic Acoustic Sources with a Maneuverable Array
… arrays. Two applications, each having different environmental assumptions and array geometries, are considered: 1) passive broadband source localization with a rigid 2-sensor array in a shallow water, multipath environment and 2) time-varying spatial spectrum estimation with a large, flexible …
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Improving Pan-African research and education networks through traffic engineering: A LISP/SDN approach
… used to enable dynamic packet forwarding in a multipath environment, through hop-by-hop ranking of alternate links based on latency and available bandwidth. The solution achieved minimum latencies with significant increases in aggregate throughput compared to static single path packet …
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Investigation of Integrated Decoupling Methods for MIMO Antenna Systems. Design, Modelling and Implementation of MIMO Antenna Systems for Different Spectrum Applications with High Port-to-Port Isolation Using Different Decoupling Techniques
… channels occupying the same bandwidth in a multipath environment. The main drawback associated with this technology is the coupling between the radiating elements. A MIMO antenna system merely acts as an antenna array if the coupling between the radiating elements is high. For this reason, …
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Reduced Rank Adaptive Filtering Applied to Interference Mitigation in Wideband CDMA Systems
… for improved performance in the presence of multipath and fading channels. Furthermore, to accommodate the demand for higher data rates, fast signal processing algorithms are required, which often translate into blind signal detection and estimation and the desire for optimal, low complexity …
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Resilient Navigation through Jamming Detection and Measurement Error Modeling
… GPS measurement error data collected in a mild multipath environment. To protect and alert GNSS end users of jamming, this thesis proposes and evaluates an autonomous algorithm to detect jamming using publicly available data from large receiver networks. The algorithm uses carrier-to-noise ratio …
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Adaptive OFDM Radar for Target Detection and Tracking
… for detecting a moving target in the presence of multipath, which exist, for example, in urban environments. We exploit the multipath reflections by utilizing different Doppler shifts. We analytically evaluate the asymptotic performance of the detector and adaptively design the OFDM waveform, by …
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Highly Accurate Ultrasonic Positioning and Tracking Systems
… location systems in these GPS-obstructed environments, indoor positioning has drawn considerable attention from both academia and industry. Indoor environments, which are characterized by obstacles such as walls, floors, ceilings, and furniture, provide countless opportunities for a wide …
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On the Development of a Very Fast Simulator for TH-UWB Systems = Sobre el Desarrollo de un Simulador Rápido para los Sistemas TH-UWB
… big effect on improving wireless communication. Multipath resistance, low power, high capacity, coexistence with other systems, ability of penetrating walls are some of the characteristics that make this system very attractive for a Short Range Wireless Communications, such as deployed in …