Browsing Department of Electrical and Computer Engineering Graduate Theses by Title
Now showing items 282-301 of 330
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Scalability-Driven Approaches to Key Aspects of the Message Passing Interface for Next Generation Supercomputing
(2014-05-23)The Message Passing Interface (MPI), which dominates the supercomputing programming environment, is used to orchestrate and fulfill communication in High Performance Computing (HPC). How far HPC programs can scale ... -
Scalar Quantization Algorithms for the Robust Transmission of Correlated Sources Over One- and Two-Way Channels
The problem of lossy transmission of correlated sources over discrete two-way channels (TWCs) is considered. The objective is to develop a robust low delay and low complexity source-channel coding scheme without using error ... -
Scheduling in IEEE 802.11e networks with quality of service assurance
(2008-08-28)Wireless Local Area Networks (WLANs) have gained popularity at an unprecedented rate, at home, at work and in public hot spot locations. In this thesis, a Selectivity Function Scheduler (SFS) is proposed for IEEE 802.11e ... -
A Secure Keyless Entry System Based on Contextual Information
Proximity identification has been widely used in access control systems. These systems, in particular Passive Keyless Entry and Start systems (PKES) for high-end automobiles, allow drivers to unlock their vehicles by ... -
Sensorless Digital Control for Solar DC Optimizers Used in DC Microgrids
This thesis presents novel control techniques to improve the performance of DC optimizers for harvesting solar energy in DC microgrids. The focus of this thesis is to implement a reliable and efficient structure to harvest ... -
A Series-Parallel Resonant Topology and New Gate Drive Circuits for Low Voltage DC to DC Converter
(2008-01-31)With rapid progress in microelectronics technology, high-performance Integrated Circuits (ICs) bring huge challenge to design the power supplies. Fast loop response is required to handle the high transient current of ... -
Single Stage Grid-Connected Micro-Inverter for Photovoltaic Systems
(2012-07-09)This thesis presents a novel Zero Voltage Switching (ZVS) approach in a grid connected single-stage flyback inverter without using any additional auxiliary circuits. The soft-switching of the primary switch is achieved by ... -
Single Stage LED Driver Technology With Low Frequency Ripple Cancellation
(2016-09-28)Because of high efficacy, long lifespan, and environment-friendly operation, LED lighting devices become more and more popular in every part of our life, such as ornament/interior lighting, outdoor lightings and flood ... -
Single Stage Power Factor Corrected Three-Level Resonant Converters
(2008-02-01)In this thesis, a new approach for single-stage power factor correction converters is proposed to increase their power ratings to be in the multiple kilowatts levels. The proposed techniques are based on the utilization ... -
Single-Microphone Speech Dereverberation: Modulation Domain Processing and Quality Assessment
(2011-07-25)In a reverberant enclosure, acoustic speech signals are degraded by reflections from walls, ceilings, and objects. Restoring speech quality and intelligibility from reverberated speech has received increasing interest ... -
A Smart Agent Framework for Personalized Service Composition
End-users face a massive amount of services when selecting and composing the desired services to meet their personal preferences. For example, people frequently use the Internet to perform on-line activities (e.g., on-line ... -
Soliton-Like LT Codes over GF(4) and GF(8)
(2016-03-30)The Luby Transform (LT) codes are the first practical realization of fountain codes. LT codes were designed for efficient use over erasure channels. However, the degree distributions designed for the Binary Erasure Channel ... -
Source-Channel Coding Techniques in the Presence of Interference and Noise
(2015-09-25)As wireless systems proliferate worldwide, interference is becoming one of the main problems for system designers. Interference, which occurs when multiple transmissions take place over a common communication medium, ... -
Source-Channel Mappings with Applications to Compressed Sensing
(2011-07-29)Tandem source-channel coding is proven to be optimal by Shannon given unlimited delay and complexity in the coders. Under low delay and low complexity constraints, joint source-channel coding may achieve better performance. ... -
Spectrum Sensing of Multiple Channels Using Multiple Sensors
(2011-11-21)Cognitive radio (CR) is a class of wireless communication technologies that have the ability to learn from the surrounding radio environment and the intelligence to adapt communication resources to enhance quality of ... -
A Speech Enhancement System Based on Statistical and Acoustic-Phonetic Knowledge
(2009-08-25)Noise reduction aims to improve the quality of noisy speech by suppressing the background noise in the signal. However, there is always a tradeoff between noise reduction and signal distortion--more noise reduction is ... -
Stability, Performance, and Implementation Issues in Bilateral Teleoperation Control and Haptic Simulation Systems
(2012-01-03)Master-Slave teleoperation systems are designed to extend a human's manipulation capability to remote tasks. Recent applications of these systems are in robotic therapy, telesurgery, and medical simulators. In practice, ... -
Steady-State Time-Domain Analysis of LLCL Resonant Converter
This thesis presents a new LLCL resonant converter topology which is capable of providing zero voltage switching of MOSFET switches for a wider range of operating frequency as compared to conventional LLC resonant converter ... -
Subharmonic Mixers in CMOS Microwave Integrated Circuits
(2009-03-25)This thesis explores the design and applications of subharmonic mixers in CMOS microwave integrated circuits. First, a 2x down-converting subharmonic mixer is demonstrated with a measured conversion gain of 8 dB using a ... -
Subspace Bootstrapping and Learning for Background Subtraction
(2013-08-08)A new background subtraction algorithm is proposed based on using a subspace model. The key components of the algorithm include a novel method for initializing the subspace and a robust update framework for continuously ...