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.
Results
Showing 1 to 20 of 29 for “"propagation modeling"”.
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Propagation modeling for land mobile satellite communications
… in the system design are the characteristics of propagation in suburban and rural areas where fading occurs due to multipath effects and vegetative shadowing. A review of the literature was performed to study these propagation impairments. Available experimental data are examined, compared, and …
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3.5 GHz Indoor Propagation Modeling and Channel Characterization
… band is new, there is a distinct shortage of propagation data and accurate channel modeling at 3.5 GHz in indoor environments. These models are necessary for cellular coverage planning and evaluating the performance and feasibility of wireless systems. This report presents the results of a …
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GIS Aided Radio Wave Propagation Modeling and Analysis
The analysis of radio wave propagation is a crucial part in designing an efficient wireless communication system. The Geographic Information System (GIS) can be incorporated into this procedure because most of the factors in radio wave propagation are geographic features. In this research, a …
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Indoor Propagation Modeling at 2.4 GHz for IEEE 802.11 Networks
… challenges. It is difficult to predict the propagation of a radio frequency wave in an indoor environment. To assist in deploying the above systems, characterization of the indoor radio propagation channel is essential. The contributions of this work are two-folds. First, in order to build a …
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Interaction Of The Cyclonic Winds With The Infrasonic Signal Generated By A Large Maritime Storm
… from infrasonic measurements. Numerical propagation modeling has predicted that one particular characteristic, back azimuth, might be analyzed to estimate storm intensity. For a storm in the open Atlantic, microbaroms which have strongly interacted with the storm winds are predicted to …
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System requirements for a dual polarized space to earth communications link
… concept is combined with the results of rain propagation modeling to define a rain induced effective attenuation which incorporates the effects of depolarization and attenuation. Methods for computing the effective attenuation and link outage times caused by rain are outlined which are …
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Localization of acoustic transients in shallow water environments
… consists of two parts. First, a time domain propagation modeling code determines the impulse response of the environment from all possible source location to a single hydrophone. This program predicts the signal as it would appear at the receiver from a grid of possible source locations. …
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Adaptive Discontinuous Galerkin Methods Applied to Multiscale & Multiphysics Problems towards Large-scale Modeling & Joint Imaging
… present a multi-scale \& multi-physics 3D wave propagation simulator to tackle these grand scientific challenges. This simulator is based on a unified high-order discontinuous Galerkin (DG) method, with adaptive nonconformal meshes, for efficient wave propagation modeling. This algorithm is …
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Seismic and gravitational studies of melting in the mantle's thermal boundary layers
… global pseudospectral seismic wave propagation modeling to characterize the sensitivity of the SPdKS seismic phase to two-dimensional, finite-width ultra-low velocity zones (ULVZs) at the core-mantle boundary. Together these three studies highlight the dynamic complexities of melting …
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Seismic and gravitational studies of melting in the mantle's thermal boundary layers
… global pseudospectral seismic wave propagation modeling to characterize the sensitivity of the SPdKS seismic phase to two-dimensional, finite-width ultra-low velocity zones (ULVZs) at the core-mantle boundary. Together these three studies highlight the dynamic complexities of melting …
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Antenna Array Systems: Propagation and Performance
… of future systems. This report focuses on signal propagation modeling for antenna array systems and on its relationship to the performance of these systems. Accurate simulation and analytical models are prerequisite to the characterization of antenna array system performance. Finally, an …
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Analysis of acoustic propagation in the region of the New England continental shelfbreak
… explaining the properties of acoustic propagation in the region, and tomographic inversion of the acoustic data. In addition, this thesis develops a new method for predicting acoustic coherence in such regions. Receptions from two 400 Hz tomography sources, transmitting from the …
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A Study of Electromagnetic Scattering of Communication Signals by Randomly Rough Surfaces
This research solves current RF propagation modeling gaps by modifying a single-frequency electromagnetic propagation analysis technique for use on communication signals and propagation channels. This research extended the Methods of Ordered Multiple Interactions (MOMI) algorithm to communication …
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Analysis of acoustic propagation in the region of the New England continental shelfbreak
… explaining the properties of acoustic propagation in the region, and tomographic inversion of the acoustic data. In addition, this thesis develops a new method for predicting acoustic coherence in such regions. Receptions from two 400 Hz tomography sources, transmitting from the …
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Propagation models for multiple-antenna systems : methodology, measurements and statistics
… increasingly important that we understand the propagation characteristics of the environments where this new technology will be deployed. In particular the development of low-cost, high-performance system architectures and protocols is largely dependent on the accuracy of available channel …
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Attenuation Field Estimation Using Radio Tomography
… In this thesis, the application of RTI to propagation problems will be studied-- specifically using RTI to measure the strength and location of attenuating objects in an area of interest, then using this knowledge of the shadowing present in an area for radio coverage prediction. In …
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Infrasound as upper atmospheric monitor
… developed to solve the problem of infrasound propagation in a stratified medium with (high Mach number) background flow, based on a modal expansion. The underlying mathematics is by no means new and has been earlier described. This solution goes beyond the effective sound speed approximation, …
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An investigation of the roles of geomagnetic and acoustic cues in whale navigation and orientation
… of the island. No avoidance reaction was found. Propagation modeling of the snapping shrimp sounds suggested that the detection range of the island was beyond the visual limit of the survey, indicating that snapping shrimp sounds may be suited as a long-range indicator of a rocky island. Lastly, …
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Advanced geophysical studies of accretion of oceanic lithosphere in Mid-Ocean Ridges characterized by contrasting tectono-magmatic settings
… methods (including finite-difference wave propagation modeling, 3D multi-channel seismic reflection imaging, waveform inversion, streamer tomography, and near-bottom magnetics) to study lithospheric accretion processes in MORs characterized by contrasting tectono-magmatic settings: the …
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Improving the planning and deployment of wireless networks via the application of deep learning
… the development of advanced tools for radio propagation modeling and resource allocation in next-generation wireless networks. It introduces an enhanced empirical model that utilizes extracted path loss components to expedite outdoor path loss predictions. Additionally, it presents the Path …
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