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 20 of 20 for “"Filter Structures"”.
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Sensitivity analysis of digital filter structures
… space recursive, finite wordlength, digital filters is developed and its relationship to the filter output quantization noise power is derived. The sensitivity measure is simply the sum of the L₂ norm of all first order partials of the system function with respect to the system parameters; …
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Switching adaptive filter structures for improved performance
We describe an adaptive filter system that is able to switch between adaptive filter algorithms in order to produce fast convergence and low mean Square error (MSE). The switching system employs two adaptive filters for two different tasks; one is intended to yield fast convergence, and logically …
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Simulation and implementation of fixed-point digital filter structures
… model is incorporated into several different filter structures and compared to the linear stochastic simulation and the actual hardware implementation. It turns out that the convergent rounding operation has an insignificant effect on the overall roundoff noise power. The Direct Form, Section …
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Development of waveguide filter structures for wireless and satellite communications
… conventional and substrate integrated waveguide structures with improved performance taking advantage of recent cross-coupled resonator filters theory achievements such as the modular filter design approach using non-resonating nodes and inline extracted pole filters. Therefore, the core of the …
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Implementation of coarse-grain coherence tracking support in ring-based multiprocessors
… for these systems. This thesis adapts two filter structures that are based on principles of coarse-grained coherence tracking, and applies them to a ring-based multiprocessor. The first structure tracks the total number of blocks of remote data cached by all processors in a node for a set …
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ΣΧΕΔΙΑΣΗ ΟΙΚΟΝΟΜΙΚΩΝ F.I.R. ΦΙΛΤΡΩΝ ΓΙΑ ΣΗΜΑΤΑ ΔΙΑΜΟΡΦΩΣΗΣ Δ
… OF THIS THESIS IS THE DESIGN OF ECONOMICAL FIR FILTERS FOR DELTA MODULATION SIGNALS (D.M. FILTERS). THE MOTIVATION FOR THIS RESEARCH WAS THE OUT-COME OF THE FOLLOWING TWO CONSIDERATIONS A: THE IMPLEMENTATION OF FIR FILTER IN GENERAL REQUIRES ALOT OF HARDWARE, B. THE SIMPLICITY OF THE CIRCUITS …
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Novel metamaterial frequency discriminating devices for next generation wireless communication systems
In this research, novel metamaterial structures based on microstrip integrated circuit technology have been investigated for filter application in the next generation of microwave wireless communication systems. A number of novel microstrip planar filter structures have been developed that are able …
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Integrated realizations of reconfigurable low pass and band pass filters for wide band multi-mode receivers
… importance belongs to the reconfigurable filters that are responsible for the selectivity of the system. The problematic of filtering is strictly connected to the architecture chosen for a multi-mode receiver realization. According to the chosen architecture, the filters can exhibit low …
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Bifurcations, Multi-stability, and Localization in Thin Structures
Thin structures exist as one dimensional slender objects (hairs, tendrils, telephone cords, etc.) and two dimensional thin sheets (tree leaves, Mobius bands, eggshells, etc.). Geometric and material nonlinearities can conspire together to create complex phenomena in thin structures. This …
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Novel miniature microwave quasi-elliptical function bandpass filters with wideband harmonic suppression
Filters are integral components in all wireless communication systems, and their function is to permit predefined band of frequencies into the system and reject all other signals. The ever-growing demand in the use of the radio frequency (RF) spectrum for new applications has resulted in the need …
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Analysis and Design of Low-Cost Waveguide Filters for Wireless Communications
… this thesis is built around advanced waveguide filter structures. Waveguide filters and the waveguide technology in general are renowned for high power capacity, low losses and excellent electromagnetic shielding. Waveguide filters are important components in fixed wireless communications as …
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First-principles control of zeolite synthesis, transformations, and intergrowth
… screening or machine learning can filter structures and compositions prior to experiments. Nevertheless, finding synthesis routes to realize computationally proposed materials still relies on trial-and-error. This thesis describes how materials discovery can be streamlined using …
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Design Space Exploration of Digital Circuits for Ultra-low Energy Dissipation
… dissipation. Various half-band digital (HBD) filter structures are evaluated for minimum energy dissipation in the sub-VT domain for a throughput constrained system. All architectures, i.e., unfolded and the basic HBD filter, are implemented and simulated using 65 nm Low-Power High-Threshold …
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Capacity, coding and interference cancellation in multiuser multicarrier wireless communications systems
… This property was used to derive optimal matched filter structures, and to determine a criterion for the selection of spreading sequences for both DS and MC CDMA. The analysis of multiple antenna systems provided a unified framework for the study of DS-CDMA and MC-CDMA on time and frequency …
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Novel narrowband microstrip filters for wireless communications systems
The novel resonant structures based on microstrip integrated circuit technology have been developed and extensively studied in this research project for filter applications in next generation wireless communication systems. Several novel microstrip bandpass filter structures have been introduced …
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Design of Microwave Front-End Narrowband Filter and Limiter Components
This dissertation proposes three novel bandpass filter structures to protect systems exposed to damaging levels of electromagnetic (EM) radiation from intentional and unintentional high-power microwave (HPM) sources. This is of interest because many commercial microwave communications and sensor …
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Motion picture restoration
… been traditionally achieved by the use of median filter structures. A new three dimensional multilevel median structure is presented in this work with the additional use of a detector which limits the distortion caused by the filters . This technique is found to be extremely effective in practice …
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Passive Component Weight Reduction for Three Phase Power Converters
… introduces EMI issues to the system, which means filters are inevitable in those systems, and they make up a significant portion of the total system size and cost. Thus, designing for high power density for both power converters and passive components, especially filters, becomes the key issue for …
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On Ways to Improve Adaptive Filter Performance
Adaptive filtering techniques are used in a wide range of applications, including echo cancellation, adaptive equalization, adaptive noise cancellation, and adaptive beamforming. The performance of an adaptive filtering algorithm is evaluated based on its convergence rate, misadjustment, …
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Techniques to Improve the Efficiency of Data Transmission in Cable Networks
… thesis focuses on redesigning the pulse shaping filter by exploiting infinite impulse response (IIR) filter structures as an alternative to the conventional finite impulse response (FIR) structures. Comprehensive comparisons show that more economical filters with better performance can be …