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 54 for “"channel characteristics"”.
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Novel receiver architectures for mobile communications
… especially for mobile communications, the channel response needs to be estimated to maintain good system performance. However, the channel characteristics are usually unknown and time varying. In this thesis, novel receiver architectures and adaptive algorithms are developed to determine …
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Rapid Acquisition of Telephone Line Channel for High Speed Data Transmission Without Using Training Sequences
… problem of rapid acquisition of a transmission channel characteristics in presence of impairments such as phase hits, phase jitters, amplitude jitter and noise. The channel acquisition is achieved without using long training sequences but the data itself is used to acquire the channel. This …
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Generalized Data-Aided Equalizers for Digital Communication Channels
… that the performance of the ACE depends on the channel characteristics. Comparing the ACE with the DFE, the performance of the ACE is not always better than the performance of the DFE. Therefore, we propose a generalized data-aided equalizer that combines the structures of the ACE and the DFE in …
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Channel modeling of multilayer diffusion-based molecular nano communication system
… on DBMC system through a multilayer channel has received less attention. The aims of this research are to mathematically model a closed-form expression of mean molecular concentration over multilayer DBMC channel, to formulate channel characteristics, and to conduct performance …
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Systems analysis of runoff and sediment yield from a watershed using a simulation model
… that will simulate runoff, sediment yield, and channel characteristics such as bed material or cross section changes, from complex, ungaged watersheds containing various crops, soil types, slopes, channel sizes, levels of conservation management and, instream erosion control structures for long …
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Feasibility Study and Performance Evaluation of Vehicle-to-Everything (V2X) Communications Applications
… notification time and distance. We conducted channel measurements at a 5.86–5.91-GHz frequency and 5.9-GHz DSRC performance measurements at railroad crossings in open spaces, shadowed environments, and rural and suburban environments related to the presented V2T architecture. Our measurements …
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Modeling the Lafourche Delta network in the Mississippi Delta Complex
<p>The distributary channel network morphology on deltas is important for the delta evolution study because channels are the primary conduit for carrying and distributing water, sediment, and nutrients to the coast. Numerical models of river deltas and their channels have improved remarkably over …
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Coding performance on satellite channels using AX.25 protocol
… of the code must be determined by observing the channel characteristics.
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Distortion-optimal parallel MRI with sparse sampling: from adaptive spatio-temporal acquisition to self-calibrating reconstruction
… several inverse problems associated with multi-channel sampling and reconstruction that pertain to parallel magnetic resonance imaging (pMRI). The first part of this dissertation addresses adaptive design of spatio-temporal acquisition and reconstruction in model-based pMRI wherein the signal …
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Knowledge Distillation in DMRS CHEST ML to Optimize Radio Performance and Hardware Efficiency
… layer. In 5G New Radio (NR) systems, good channel estimation is crucial for demodulating uplink signals like those sent over the Physical Uplink Shared Channel (PUSCH). Demodulation Reference Signals (DMRS) help channel estimation but are often sparse, needing smart interpolation to …
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Simulation of High Frequency Waves Reflected From a Turbulent Ionosphere for Spread Spectrum Systems
The communication channel established with HF waves reflected by the ionosphere is investigated. The background ionosphere is modeled by a horizontally stratified medium. This model is superimposed with random irregularities. The resulting channel is characterized by a random transfer function. …
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The application of forward error correction techniques in wireless ATM
… correction techniques to improve the perceived channel characteristics to the extent that the channel becomes transparent to the higher layers and allows the use of an unmodified A TM protocol over the channel. In the course of the investigation that this dissertation describes, three possible …
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Holocene Periods of Aggradation and Incision, Hanson Creek, Washington
… Washington provide insight into changes in channel morphology and paleoenvironment within the region over the last 8000 years. Stratigraphically and spatially coincident archaeological evidence reveals information related to human occupation during the latter half of the epoch. Using LiDAR …
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Evaluating Geomorphic Change in Little Creek Using Repeated Cross-Sectional and Longitudinal Profile Surveys
… of this study was to monitor water quality and channel conditions before, during, and after a selective harvest of redwood. A selective harvest occurred in the North Fork of Little Creek in Summer 2008. In August 2009, approximately 90% of the Little Creek Watershed was burned in the Lockheed …
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A Comparison of Lidar Generated Channel Features with Ground-Surveyed Channel Features in the Little Creek Watershed
<p>Detecting change in stream channel features over time is important in understanding channel morphology and the effects of both natural and anthropogenic influences. Channel features historically, and now currently, are being measured using a variety of ground survey techniques. These surveys …
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Urban Channel Erosion Quantification in Upland Coastal Zone Streams of Virginia, USA
To quantify sediment contributions due to urban channel enlargement, 50 study sites were selected on 1st- through 3rd-order streams, in watersheds with varying levels of urbanization, in two Physiographic Regions (Coastal Plain and Piedmont), and in the Coastal Zone Management Area of Virginia. At …
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Wavelet Modulation in Gaussian and Rayleigh Fading Channels
… sends data at multiple rates through an unknown channel. This novel multirate diversity strategy offers improved message recovery over conventional modulation techniques: if the message is not received at one rate due to the channel disturbances, it can be received at another rate where the …
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A Simulator for analyzing the throughput of IEEE 802.11b Wireless LAN Systems
… The campaign was conducted in two different channel conditions, office space and open hall. The channel measurements were also performed at these locations to understand the multipath. Comparative studies indicate that the choice of the rate adaptation algorithm hugely influences the …
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Quantifying the environmental factors that determine benthic macroinvertebrate assemblages in streams by analyzing stressors associated with a gradient of cattle grazing
… measures and visual estimates of riparian and channel characteristics had strong relationships with macroinvertebrate metrics but the relationships were never as strong as those detected with instream measurements of % fines. The channel characteristic, bank height, was the best predictor of % …
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Acoustic interference fields in the ocean
… fields in geometrically dispersive sound channels. The purpose is to describe and provide an understanding of the physical mechanisms in these two areas by comparing analyzed results from ocean experiments with theoretical computations. Experiments using directive 19.5-kHz transducers …
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