Index Catalog // ScholarsArchive@OSU

Model development via delay extraction for the time-domain simulation of lossy transmission lines.

Creator:: Blevins, Chris
Abstract:: This thesis presents two new approaches for the broadband, time-domain modeling of lossy transmission lines. Each approach is based on an alternative derivation of delay extraction in order to separate the line's linear phase from its attenuation and dispersion. Augmentation networks represent the derived attenuation networks as rational function approximations....
Resource Type:: Masters Thesis

Throughput optimization for single-hop wireless networks using network coding

Creator:: Tran, Tuan Tho
Abstract:: Recent advances in wireless technologies have helped the proliferation of wireless devices, ranging from hand-held devices such as cellular phones to more powerful mobile computing platforms as such laptops [1]. Along with that, the end users’ applications running on these devices, ranging from text message to multimedia applications such as...
Resource Type:: Dissertation

Ultra-low power receivers for wireless sensor networks

Creator:: Ayers, James S.
Abstract:: In wireless sensor network applications, low-power operation of the wireless receiver is critical. To address this need an ultra-low power Binary Frequency Shift Keying (BFSK) receiver using the super-regenerative architecture is developed. A prototype receiver is built and tested for operation in the 900 MHz ISM band. Lab measurements show...
Resource Type:: Dissertation

Understanding the ultra-wideband channel within a computer chassis

Creator:: Redfield, Stephen J.
Abstract:: Recent developments in computing technology have generated a demand for more streamlined and effective test systems. By replacing traditional in-chassis wired interconnects with a broadcast wireless system, fault detection and error susceptibility will drastically improve, input/output capabilities will expand, and routing complexity will decrease. Ultra-wideband impulse radio's (UWB-IR) characteristic multipath-immunity...
Resource Type:: Masters Thesis

Iterative reconstruction methods of CT images using a statistical framework

Creator:: Delgado, Diana
Abstract:: Medical imaging technologies play a vital role in early diagnosis of disease by providing internal images of the human body to medical professionals. Computed Tomography (CT) is currently the most commonly used medical imaging technology because it is easy to use, detectors and scanners are constantly improving, and more importantly,...
Resource Type:: Masters Thesis

Low power design techniques for analog-to-digital converters in submicron CMOS

Creator:: Musah, Tawfiq
Abstract:: Advances in process technologies have led to the development of low-power high speed digital signal processing blocks that occupy small areas. These advances are critical in the development of portable electronic devices with small feature size and long battery life. However, the design of analog and mixed-signal building blocks, especially...
Resource Type:: Dissertation

Methods for evaluating the impact of renewable resource variability on grid operation and planning

Creator:: Halamay, Douglas A.
Abstract:: With the recent interest in increasing the penetration of renewable energy sources onto the power grid, there has been an unprecedented rapid deployment of wind generation, especially in the US Pacific Northwest. While wind farm developers have continued to expand their operations, power system operators are left to deal with...
Resource Type:: Masters Thesis

Measurement and characterization of ultra-wideband wireless interconnects within active computing systems

Creator:: Woracheewan, Sirikarn
Abstract:: Ultra-wideband (UWB) radio has become an attractive alternative for wireless communications due to the robustness to multipath fading, low power transmission, mostly-digital implementation, and low cost. Furthermore, short-range, high data-rates applications are possible with UWB radios due to the wide spectral allocations at 3.1 - 10.6 GHz. This thesis presents...
Resource Type:: Masters Thesis

Opportunistic bandwidth sharing through reinforcement learning

Creator:: Venkatraman, Pavithra
Abstract:: The enormous success of wireless technology has recently led to an explosive demand for, and hence a shortage of, bandwidth resources. This expected shortage problem is reported to be primarily due to the inefficient, static nature of current spectrum allocation methods. As an initial step towards solving this shortage problem,...
Resource Type:: Masters Thesis

Energy-efficient, short-range ultra-wideband radio transceivers

Creator:: Hu, Changhui
Abstract:: Short-range wireless communications continually attract interest from both industry and academia, and it is changing our life in every aspect in the last decade. The design of wireless transceivers is the bottleneck for variety applications, due to RF modeling inaccuracy, stringent FCC regulations over the transmitted power spectrum, interference, multi-path...
Resource Type:: Dissertation

Recognizing human group activities in video through mining optimal features

Creator:: Amer, Mohamed R.
Abstract:: Given a video, we would like to recognize group activities, localize video parts where these activities occur, and detect actors involved in them. To this and, we propose a novel, mid-level feature, called control point, for representing group activities. The control points are aimed at summarizing visual cues, lifting from...
Resource Type:: Masters Thesis

Immune radio architecture for platform interference

Creator:: Alban, Eduardo
Abstract:: The decrease of switching times accompanied by the corresponding increase of clock speeds and data rates, contributes to improve the overall system computational performance. At the same time, they also affect wireless communications due to an increment in the emissions of electromagnetic radiation on the radio bands. In this dissertation...
Resource Type:: Dissertation

Dual referencing guidelines to minimize power delivery noise coupling

Creator:: Mark, Shannon
Abstract:: Dual referencing has been garnering a lot of attention in the power integrity community, specifically in the voltage mode driver application because it shows a lower overall power delivery noise (PDN) compared to other signal referencing types. Additionally, the increasing push to drive down package and board manufacturing costs is...
Resource Type:: Masters Thesis

Adaptive load balancing metric for WLANs

Creator:: Ryou, Jong bum
Abstract:: As the number of mobile devices accessing large-scale WLANs such as campus and metropolitan area networks increases, the need for load balancing among the cells becomes crucial. In addition, the network must also support some minimum handoff tolerance defined by an application. A number of load balancing techniques have been...
Resource Type:: Dissertation

Design and analysis techniques for nano-joule ADCs and sampling linearity

Creator:: Brown, Thomas (Thomas William)
Abstract:: Two aspects of ADC system performance are addressed in this work. First, the combination of the ADC and its associated reference are co-designed for an energy constrained remote sensing system. Second, sampling linearity is mathematically analyzed as a function of frequency to provide enhanced understanding into an ADC's requisite sampling...
Resource Type:: Dissertation

Prototyping a triple-layer phoswich detection system

Creator:: Duncan, Christopher L.
Abstract:: Multi-layer optically coupled scintillation based radiation detectors, known as phoswich detectors, have rapidly evolved in recent years. During the same time, digital signal processing has improved radiation discrimination accuracy and enhanced reliability, while reducing complexity and size of traditional analog signal processing methods. A new generation of high-speed radiation detectors...
Resource Type:: Masters Thesis

Analysis and design on low-power multi-Gb/s serial links

Creator:: Hu, Kangmin
Abstract:: High speed serial links are critical components for addressing the growing demand for I/O bandwidth in next-generation computing applications, such as many-core systems, backplane and optical data communications. Due to continued process scaling and circuit innovations, today's CMOS serial link transceivers can achieve tens of Gb/s per pin. However, most...
Resource Type:: Dissertation

Variable sampling compensation of networked control systems with delays using neural networks

Creator:: Lopez-Echevarria, Daniel
Abstract:: In networked control systems (NCS) information or packets usually flow from a sensor or a set of sensors to a remotely located controller. Then the controller processes the received information and sends a series of control commands to the actuators through a communication network which could be either wireless or...
Resource Type:: Dissertation

Data acquisition techniques for next generation wireless sensor networks

Creator:: Ehsan, Samina
Abstract:: The meteoric rise and prevalent usage of wireless networking technologies for mobile communication applications have captured the attention of media and imagination of public in the recent decade. One such proliferation is experienced in Wireless Sensor Networks (WSNs), where multimedia enabled elements are fused with integrated sensors to empower tightly...
Resource Type:: Dissertation

End-to-end network throughput enhancement through physical-layer network coding

Creator:: Maeouf, Sofean Ahmed
Abstract:: Physical-Layer Network Coding (PNC) is a promising technique that has great potentials for improving the achievable data rates of end-to-end flows through higher packet transmission rates, thereby increasing the overall network throughput. In this thesis, we study the performance of the PNC transmission techniques for unidirectional end-to-end flows in multi-hop...
Resource Type:: Masters Thesis

EM-MAC : an energy-aware multi-channel medium access control protocol for multi-hop wireless networks

Creator:: Sivanantha, Akhil
Abstract:: The stupendous growth in wireless and mobile devices in the recent years has prompted researchers to look at innovative approaches that enable effective use of the available resources. In this thesis, we propose a medium access control (MAC) protocol, referred to as EM-MAC, that enables wireless devices with multi-channel access...
Resource Type:: Masters Thesis

Low-power high-resolution delta-sigma ADC design techniques

Creator:: Wang, Tao
Abstract:: This dissertation presents a low-power high-resolution delta-sigma ADC. Two new architectural design techniques are proposed to reduce the power dissipation of the ADC. Compared to the conventional active adder, the direct charge transfer (DCT) adder greatly saves power by keeping the feedback factor of the active adder unity. However, the...
Resource Type:: Dissertation

Design of a low jitter digital PLL with low input frequency

Creator:: Jung, Seokmin
Abstract:: Complex digital circuits such as microprocessors typically require support circuitry that has traditionally been realized using analog or mixed-signal macros. PLL circuits are used in many integrated applications such as frequency synthesizers and inter-chip communication interfaces. As process technologies advance and grow in complexity, the challenge of maintaining required analog...
Resource Type:: Masters Thesis

Spatial motion vector recovery in wireless high deﬁnition video transmission using H.264 over WLANs

Creator:: Gatimu, Kevin
Abstract:: Mobile devices are becoming more prevalent and complex. As a result, the wireless communication aspect of these devices is becoming increasingly signiﬁcant. At the same time, video demands in terms of availability and quality are also on the uprise. High deﬁnition (HD) video is the standard of choice for meeting...
Resource Type:: Masters Thesis

Resource allocation methods for quality-of-service provisioning in heterogeneous wireless networks

Creator:: Chakchouk, Nessrine
Abstract:: The increased use of mobile wireless devices that we have recently been witnessing, such as smartphones, tablets, e-readers, and WiFi enabled devices in general, is driving an unprecedented increase in the amount of data traffic. This fast market adoption of the wireless technology along with the tremendous success of multimedia...
Resource Type:: Dissertation

Time and statistical information utilization in high efficiency sub-micron CMOS successive approximation analog to digital converters

Creator:: Guerber, Jon
Abstract:: In an industrial and consumer electronic marketplace that is increasingly demanding greater real-world interactivity in portable and distributed devices, analog to digital converter efficiency and performance is being carefully examined. The successive approximation (SAR) analog to digital converter (ADC) architecture has become popular for its high efficiency at mid-speed and...
Resource Type:: Dissertation

Coordinating secondary-user behaviors for inelastic traffic reward maximization in large-scale DSA networks

Creator:: NoroozOliaee, MohammadJavad
Abstract:: We develop efficient coordination techniques that support inelastic traffic in large-scale distributed dynamic spectrum access DSA networks. By means of any learning algorithm, the proposed techniques enable DSA users to locate and exploit spectrum opportunities effectively, thereby increasing their achieved throughput (or "rewards" to be more general). Basically, learning algorithms...
Resource Type:: Masters Thesis

Semi-digital PLL architecture for ultra low bandwidth applications

Creator:: George, Edmond
Abstract:: Phase Locked Loops(PLLs) are an integral part of almost every electronic system. Systems involving low frequency clocks often require PLLs with low bandwidth. The area occupied by the large loop filter capacitor and resistor in a low bandwidth PLL design makes the realization of traditional charge-pump PLL architecture impractical on...
Resource Type:: Masters Thesis

Passive health monitoring with wirelessly powered medical devices

Creator:: House, Samuel
Abstract:: The proliferation of body worn autometric devices has been enabled by advances in low-power electronics and fueled by the quantified-self movement. These devices range in complexity from pedometers to clinical vital sign measurement. They all share the same drawback, typically the most expensive and heaviest component, the battery. The future...
Resource Type:: Masters Thesis

Pattern discovery in noisy images

Creator:: Dhamodaran, Sharath Kumar
Abstract:: The Focused Ion Beam (FIB) tool is a versatile instrument for nano-machining in circuit editing. Circuit editing is one of the most important steps in the design of an electronic circuit on a chip. Circuit editing can be improved by imaging of silicon plates and analyzing the resultant images. However...
Resource Type:: Masters Thesis

Fast queuing policies via convex relaxation

Creator:: Nguyen-Huu, Duong
Abstract:: Traditionally, networking protocol designs have placed much emphasis on point-to-point reliability and efficiency. With the recent rise of mobile and multimedia applications, other considerations such as power consumption and/or Quality of Service (QoS) are becoming increasingly important factors in designing network protocols. As such, we present a new flexible framework...
Resource Type:: Masters Thesis

Modeling and analysis of spur structure of digital-to-time conversion based frequency synthesizers

Creator:: Talwalkar, Sumit A.
Abstract:: Frequency synthesizers are critical components of all communication systems. This thesis considers the issue of undesirable frequency spurs of a relatively recent type of frequency synthesis architecture called digital-to-time conversion (DTC). The DTC-based frequency synthesis architecture has important performance benefits over older frequency synthesizers, such as fast frequency switching, large...
Resource Type:: Dissertation

Flexible dual TCP/UDP streaming for H.264 HD video over WLANs

Creator:: Zhao, Jing
Abstract:: High Definition video streaming over WLANs faces many challenges because video data requires not only data integrity but also frames have strict playout deadline. Traditional streaming methods that rely solely on either UDP or TCP have difficulties meeting both requirements because UDP incurs packet loss while TCP incurs delay. This...
Resource Type:: Masters Thesis

Design techniques for low-power multi-GS/s analog-to-digital converters

Creator:: Jiang, Tao
Abstract:: Ultra-high-speed (>10GS/s), medium-resolution (5~6bit), low-power (<50mW) analog-to-digital converter can find it application in the areas of digital oscilloscopes and next-generation serial link receivers. There are several challenges to enable a successful design, however. First, the time-interleaved architecture is required in order to achieve over 10GS/s sampling rate, with the trade-off...
Resource Type:: Dissertation

Energy efficient communication across on-chip wires in digital CMOS

Creator:: Postman, Jacob
Abstract:: For the past half century, CMOS process scaling has followed Moore's law, approximately doubling transistor density every 18 months. While locally routed wires have generally scaled with transistor size, longer wires have scaled at a slower rate and in some cases have grown larger as chip size and complexity have...
Resource Type:: Dissertation

Real-time radioxenon measurement using a Compton-suppressed well-type phoswich detector for nuclear explosion monitoring

Creator:: Alemayehu, Bemnet
Abstract:: Radioxenon detection is a technique used to monitor nuclear explosion and verify the Comprehensive Nuclear-Test-Ban Treaty (CTBT). Because of an ultra-low concentration of radioxenon at radioxenon monitoring stations, radioxenon detection systems must have high sensitivity. This sensitivity is measured in terms of detector's minimum detectable concentration (MDC). It is required...
Resource Type:: Dissertation

One-to-many node disjoint paths routing in generalized hypercube, dense Gaussian, and hexagonal mesh networks

Creator:: Alsaleh, Omar I.
Abstract:: Routing from a single source node to multiple destination nodes using node disjoint paths (NDP) has many important applications in parallel systems. For example, if a source node wants to send distinct messages to distinct destination nodes, then the one-to-many NDP routing is useful. Unlike parallel systems with shared-memory, each...
Resource Type:: Dissertation

Data driven optimization in SAR ADC

Creator:: Leung, Jerry
Abstract:: Recent publications show that successive approximation register (SAR) analog to digital converters (ADC) are capable of achieving high efficiency over other ADC topologies. Furthermore, techniques have been adopted to process signals with low activity periods, such as biomedical and industrial sensors. Prior work used least- significant bit first quantization (LSBFQ)...
Resource Type:: Masters Thesis

Automated verilog-to-layout synthesis of ADCs using custom analog cells

Creator:: Waters, Allen
Abstract:: A procedure for automating the design and layout of analog-to-digital converters (ADCs) is presented. This procedure makes use of the existing synthesis and place-and-route tools that are common in digital circuit design. A method for adding rudimentary analog cells to the standard library is described, allowing the designer to synthesize...
Resource Type:: Dissertation

Linearity enhancement techniques for data converters

Creator:: Cao, Jinzhou
Abstract:: Data converters are essential interface circuits between the analog world that people live in and the digital processors that people live with. Linearity, which often is a tradeoff against other performance criteria, is one of the major performance demands from applications for both analog-to-digital converts (ADC) and digital-to-analog converters (DAC)....
Resource Type:: Dissertation

Dynamic Methods to Improve Streaming of H.264 HD Video Over 802.11 Wireless Networks

Creator:: Sinky, Mohammed H.
Abstract:: Wireless High Definition Video Transmission (WHDVT) over 802.11-based networks enjoys widespread deployment among today's multimedia solutions. Examples include Intel® Wireless Display and Apple Airplay®, to name a few. In these systems, peer-to-peer networks are established over which H.264-encoded video is transported wirelessly to be decoded and played back at the...
Resource Type:: Dissertation

The Architecture of a Reusable Built-In Self-Test for Link Training, IO and Memory Defect Detection and Auto Repair on 14nm Intel SOC

Creator:: Querbach, Bruce
Abstract:: The complexity of designing and testing today's system on chip (SOC) is increasing due to greater integrated circuit (IC) density and higher IO and memory frequencies. SOCs for the mobile phone and tablet market have the unique challenge of short product development windows, at times less than six months, and...
Resource Type:: Dissertation

High-Resolution mm-wave Digitally Controlled Oscillator in CMOS

Creator:: Wang, Yunqi
Abstract:: All-digital PLLs promise flexible and precise frequency modulation continous-wave(FMCW) radar signal signal for 77GHz radar applications. Such PLLs require digitally-controlled oscillators(DCO) with wide frequency tuning range and high resolution to address a range of applications and low phase noise requirements. In this thesis, novel resonator structures with ne capacitance/inductance switching...
Resource Type:: Masters Thesis

A 5 GHz Wi-Fi Receiver Front End with 4x80 MHz Channels for a High Accuracy Indoor Localization System

Creator:: Gray, Kyle L.
Abstract:: The ability to accurately locate people and objects indoors will enable opportunities for control and automation of indoor environments. Current indoor localization solutions require dedicated hardware which must be custom tailored to each application. There are large technological, societal, and economic benefits in developing a more general purpose system that...
Resource Type:: Masters Thesis

Noise and Blocker Cancellation Techniques for Power and Area Efficient Wireless Receivers

Creator:: Pourbagheri, Saeed
Abstract:: The design of mobile wireless devices has always focused on reducing power, area, and cost. This dissertation proposes two techniques that are leveraged to save power and area and therefore cost. The first techniques reduces the noise in the receiver and results in a relaxed power requirement. The second technique...
Resource Type:: Dissertation

A Two-element CZT-based Radioxenon Detection System for Nuclear Weapon Test Monitoring

Creator:: Ranjbar, Lily
Abstract:: Detection of xenon radioisotopes (radioxenons) has proven to be an important method for detecting nuclear explosions and is particularly well suited for detecting undeclared underground testing. The radioxenon isotopes ¹³¹mXe (t₁/₂ = 11.934 d), ¹³³mXe (t₁/₂ = 2.19 d), ¹³³Xe (t₁/₂ = 5.243 d) and ¹³⁵Xe (t₁/₂ = 9.14 h)...
Resource Type:: Dissertation

Multi-User Massive MIMO Channel Estimation Based on Kalman Filters

Creator:: Yao, Zhaoda
Abstract:: In wireless communication, channel state information (CSI) is essential for data detection. Fast fading coefficients estimation is important in order to acquire accurate CSI. Kalman filters (KF) are widely used for real time parameter estimation and can be used to estimate the fast fading coefficients of a mobile communication channel....
Resource Type:: Masters Thesis

Channel Estimation in TDD Massive MIMO Systems with Subsampled Data at BS

Creator:: Tian, Yichuan
Abstract:: Massive MIMO is a promising technique for future 5G communications due to its high spectrum and energy efficiency. To realize its potential performance gain, accurate channel state information at transmitter side (CSIT) is essential. Frequency division duplex (FDD) is widely employed by the most cellular systems today. However, it requires...
Resource Type:: Masters Thesis

Surface-Normal Modulation of Fano Resonances in Metallic Photonic Crystals for Free-Space Optical Interconnects

Creator:: Ren, Fanghui
Abstract:: This dissertation focuses on the development of ultra-compact optical devices for free-space modulation. We propose a surface-normal modulator using metallic photonic crystals for free-space optical interconnects. The active control of light intensity is achieved by engineering the Fano resonances in metallic photonic crystals. Both thermo-optic modulation and electro-optic modulation of...
Resource Type:: Dissertation

Compressive Sensing for Low Power Sensor Design

Creator:: Behravan, Vahid
Abstract:: Recent sensor System-on-Chips (SoC) have enabled significant advances in energy-efficiency by incorporating various micro-powered building blocks. Unfortunately, most of these sensor systems do not address the high power cost associated with data storage and transmission, which in some cases vastly exceeds the power consumed by the rest of the SoC....
Resource Type:: Dissertation

Position estimation in indoor localization with trilateration

Creator:: Su, Zhenqiang
Abstract:: Triangulateration uses geometric distance to estimate the location of user by employing techniques like received signal strength (RSS), time-of-arrival (TOA), time-difference-of-arrival (TDOA) and image processing. Radio frequency (RF) signal positioning using TOA or TDOA techniques generally requires timing synchronization of the anchors and/or the anchors and targets. If the desired...
Resource Type:: Dissertation

Development of a CZT-Silicon Detection System in Support of the Comprehensive Nuclear-Test-Ban Treaty

Creator:: Alhawsawi, Abdulsalam M.
Abstract:: The Comprehensive Nuclear-Test-Ban Treaty (CTBT) bans all nuclear explosion tests for military or civilian purposes. The International Monitoring System (IMS) was established to verify compliance with the treaty. It consists of several monitoring stations that detect: seismic activities, hydrocoustic activities, infrasound waves, and radionuclide particles and noble gases. Radioxenon detection...
Resource Type:: Dissertation

Power Efficient Architectures for Medium-high Resolution Analog-to-Digital Converters

Creator:: Sadollahi, Mahmoud
Abstract:: Analog-to-digital converters are essential components to the portable devices that we are using today. Wireless sensors, body implanted devices, communication devices and so forth require low power ADCs. Therefore achieving higher resolution and bandwidth with lower power consumption is targeted in ADCs design. In this work power efficient ADCs for...
Resource Type:: Dissertation

Power Efficient Architectures for Low Noise Switched-Capacitor Filters and High Accuracy Analog-to-Digital Converters

Creator:: Payandehnia, Pedram
Abstract:: Filters and data converters are key analog-and-mixed-signal (AMS) building blocks in communication systems, such as software-deﬁned radios and internet-of-things. In this dissertation, novel switched-capacitor ﬁlter and analog-to-digital converter (ADC) circuit conﬁgurations have been explored which are power eﬃcient and are digital scaling friendly. First, a novel switched-capacitor low-pass ﬁlter architecture...
Resource Type:: Dissertation

A Microwave Signal Correlator Based on Parametric Pumping of Spin Waves

Creator:: Hansen, Mikkel N.
Abstract:: This work demonstrates correlation of microwave signals encoded with 16-bit codes using the parametric interaction of spin waves. Signal processing correlators are devices that compare two signals, such as a reference code and a received code, where the output indicates the similarity between the signals. Correlators are used in communication...
Resource Type:: Masters Thesis

Adaptive Streaming Methods using Dual Protocols and Reinforcement Learning

Creator:: Gatimu, Kevin
Abstract:: The ubiquity of high quality video and proliferation of mobile devices has contributed to an unprecedented rise in video consumption. HTTP, in conjunction with adaptive streaming, has become the de facto mechanism for delivering the vast majority of video as it readily caters to heterogeneous networks and devices. This dissertation...
Resource Type:: Dissertation

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