Index Catalog // Hyrax

Network Traffic-Driven Hybrid Learning for Classifying Seen and Unseen IoT Device Types

Schöpfer:: Bao, Jiaqi
Abstract:: IoT networks can be viewed as collections of Internet-enabled physical devices and objects, embedded with sensor, actuator, computation, storage and communication components, that are capable of connecting and exchanging data to one another. In recent years, organizations have allowed more and more IoT devices to be connected to their networks,...
Resource Type:: Masters Thesis

A Microwave Signal Correlator Based on Parametric Pumping of Spin Waves

Schöpfer:: 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

Multi-User Massive MIMO Channel Estimation Based on Kalman Filters

Schöpfer:: 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

Schöpfer:: 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

High-Resolution mm-wave Digitally Controlled Oscillator in CMOS

Schöpfer:: 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

Schöpfer:: 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

Data driven optimization in SAR ADC

Schöpfer:: 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

Pattern discovery in noisy images

Schöpfer:: 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

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

Schöpfer:: 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

Fast queuing policies via convex relaxation

Schöpfer:: 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

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

Schöpfer:: 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

Passive health monitoring with wirelessly powered medical devices

Schöpfer:: 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

Semi-digital PLL architecture for ultra low bandwidth applications

Schöpfer:: 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

Layout dependent and bias independent scalable substrate model for RF MOSFETs

Schöpfer:: Suravarapu, Ravikanth
Abstract:: The dependence of the substrate resistance, R[subscript sub], for MOS transistor RF modeling on transistor biasing and layout is studied from device simulations and measurements. Though R[subscript sub] is found to be bias dependent, the error incurred by assuming a constant value equal to the DC resistance is not significant....
Resource Type:: Masters Thesis

Analysis and modeling of coplanar on-chip interconnects on silicon substrates

Schöpfer:: Luoh, Yi
Abstract:: The electrical behavior of on-chip interconnects has become a dominant factor in silicon-based high speed, RF, and mixed-signal integrated circuits. In particular, the frequency-dependent loss mechanisms in heavily-doped silicon substrates can have a large influence on the transmission characteristics of on-chip interconnects. To optimize the performance of the integrated circuit,...
Resource Type:: Masters Thesis

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

Schöpfer:: 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

Design of a low jitter digital PLL with low input frequency

Schöpfer:: 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

A study of basic building blocks of analog-to-digital delta-sigma modulators

Schöpfer:: Guo, Yuhua
Abstract:: In this thesis, a novel Direct-Charge-Transfer (DCT) integrator structure is proposed, which can settle much faster than regular switch-capacitor integrators. A new Spread-Spectrum Dynamic Element Matching (SS-DEM) algorithm is also introduced, which can effectively spread or shape the nonlinearity error of multi-bit DAC in the feedback path, thus improve the...
Resource Type:: Masters Thesis

Non-data aided parametric based carrier frequency estimators for bursty GMSK communication systems

Schöpfer:: Kandukuri, Ajay
Abstract:: Estimating the carrier frequency from a modulated waveform is one of the most important functions of a coherent signal receiver. Good performance and low bit error rates are obtained by coherent demodulation. Therefore, exact knowledge of the received signal carrier frequency is critical for communication systems. Also due to the...
Resource Type:: Masters Thesis

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

Schöpfer:: 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

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

Schöpfer:: 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

Via-only microwave/millimeter wave bandpass filters for LTCC applications

Schöpfer:: Bhargava, Gaurav
Abstract:: With an increasing number of wireless applications at microwave frequencies, the frequency spectrum is becoming quite crowded. Due to this congestion, the current state of technology is leading towards upper microwave and millimeter wave spectra as they also offer other distinct advantages such as larger bandwidth and smaller component footprint....
Resource Type:: Masters Thesis

Recognizing human group activities in video through mining optimal features

Schöpfer:: 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

Prototyping a triple-layer phoswich detection system

Schöpfer:: 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

Dual referencing guidelines to minimize power delivery noise coupling

Schöpfer:: 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

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

Schöpfer:: 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

Schöpfer:: 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

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

Schöpfer:: 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

Understanding the ultra-wideband channel within a computer chassis

Schöpfer:: 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

Schöpfer:: 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

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

Schöpfer:: 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

Ultra low capacitance RFIC probe

Schöpfer:: Jacob, Michael E.
Abstract:: In Radio Frequency Integrated Circuits (RFIC) or high frequency digital ICs, there is a demand to probe the internal nodes for testing. The ultra low capacitance RFIC probe presented in his work is a flexible tool for these applications. The probe utilizes the coupling between a tungsten needle and the...
Resource Type:: Masters Thesis

Urban military operation mobility model

Schöpfer:: Kang, Ho Sung
Abstract:: A Mobile Ad-hoc NETwork (MANET) is collection of wireless mobile nodes without a network infrastructure or centralized administration. Although MANETs can be used in many applications, such as mobile Internet, military communication, and disaster relief networks, a number of challenges remain. These include routing, medium access control, security, scalability, energy...
Resource Type:: Masters Thesis

A novel linear generator for wave energy applications

Schöpfer:: Ernst, Steven George
Abstract:: With the increasing effort to identify alternative methods of energy generation, extraction of ocean energy has gathered a large interest. Research and industry have begun considering wave energy as the next new alternative energy. The unique challenges of ocean energy requires a wave energy converter to be both robust and...
Resource Type:: Masters Thesis

Modeling and simulation methods for RF MEMS VCOs

Schöpfer:: Sankaranarayanan, Janakiram Ganesh
Abstract:: This work focusses on the modeling and the development of efficient coupled simulation techniques for MEMS based RF oscillators. High-level models for MEMS based varactors have been discussed and their accuracy issues are identified, based on comparisons with numerical simulations. A faster simulation approach based on the time-domain shooting method...
Resource Type:: Masters Thesis

High-speed CMOS dual-modulus presalers for frequency synthesis

Schöpfer:: Desikachari, Ranganathan
Abstract:: Phase-locked loop (PLL) frequency synthesizers lie at the heart of most radio transceivers. An important objective of the electronics and communications industry is to design high-speed building blocks which dissipate the lowest possible power, and to ac- complish this with the cheapest technology. The dual-modulus prescaler is one of the...
Resource Type:: Masters Thesis

An ultra low power frequency reference for timekeeping applications

Schöpfer:: Oporta, Hector Ivan
Abstract:: An ultra low power crystal oscillator that provides a frequency reference for battery powered timekeeping applications is presented. An amplitude control circuit is employed to ensure that minimum current is consumed. A subthreshold voltage regulator provides a supply voltage for the oscillator with minimum current consumption. The oscillator and regulator...
Resource Type:: Masters Thesis

Generalized radix design techniques for low-power, low voltage pipelined and cyclic analog-digital converters

Schöpfer:: Sharma, Vivek
Abstract:: This thesis proposes a novel technique for the design of pipelined and cyclic ADCs utilizing generalized radix gain stages. Several models have been proposed for the optimization of high performance pipelined ADCs by various researchers. This work builds upon them, using a simple but accurate model to estimate the optimal...
Resource Type:: Masters Thesis

An enhanced swing differential Colpitts CMOS VCO for low-voltage operation

Schöpfer:: Farahbakhshian, Farhad
Abstract:: An enhanced swing differential Colpitts VCO (ESDC-VCO) dramatically improves the swing of a Colpitts VCO by allowing the signal to swing below ground and above the supply voltage. Fabricated in a 1P8M 0.13 um CMOS process, the ESDC-VCO operates at 4.9GHz with a 0.475-V supply and consumes 2.7mW. The measured...
Resource Type:: Masters Thesis

An ultra low voltage micropower GPS receiver RF front-end for wildlife tracking

Schöpfer:: Heiberg, Adam C.
Abstract:: A fully integrated CMOS GPS receiver RF front end optimized for low power operation is presented. The system operates with a supply voltage down to 250 mV. A prototype has been fabricated in a 0.13μm CMOS process and includes a low voltage LNA, quadrature oscillators, and quadrature mixers. It exhibits...
Resource Type:: Masters Thesis

Digital pulse shape discrimination methods for triple-layer phoswich detectors using wavelets and fuzzy logic

Schöpfer:: Yousefi, Siavash
Abstract:: A two-channel data acquisition system for simultaneous detection and discrimination of beta particles and gamma rays has been developed. Each channel measures and analyzes the input pulses resulting from the absorption of radiation in the layers of the detector. The detector is a triple-layer phoswich (phosphor sandwich) scintillation detector followed...
Resource Type:: Masters Thesis

Side channel attack resistant elliptic curves cryptosystem on multi-cores for power efficiency

Schöpfer:: Yoo, Jaewon
Abstract:: The Advent of multi-cores allows programs to be executed much faster than before. Cryptoalgorithms use long-bit words thus parallelizing these operations on multi-cores will achieve significant performance improvement. However, not all long-bit word operations in cryptosystems are suitable for parallel execution on multi-cores. In particular, long-bit words used in Elliptic...
Resource Type:: Masters Thesis

A survey on continuous-time modulators : theory, designs and implementations

Schöpfer:: Gao, Xiaoran
Abstract:: Recently, delta-sigma modulation has become a widely applied technique for high-performance analog-to-digital conversion of narrow-band signals. Most of the early designs used discrete-time structure for good accuracy and good linearity. The transfer functions are independent of the clock frequency. However, high unity-gain bandwidths of the opamps are required to satisfy...
Resource Type:: Masters Thesis

Architecture design of multiplexed incremental analog-to-digital converters

Schöpfer:: Zhang, Zhiqing
Abstract:: Analog-to-Digital Data Converters (ADCs) used in instrumentation and measurements often require high absolute accuracy, including excellent linearity and negligible dc offset. Incremental data converters (IDCs) provide a solution for such measurement applications. Since IDCs are essentially delta-sigma converters with reset operation before each conversion, they retain most of the advantages...
Resource Type:: Masters Thesis

Modified VLSI designs for error correction codes

Schöpfer:: Chen, Lupin
Abstract:: Nowadays, error correction codes have become an integral part in almost all the modern digital communication and storage systems. With the continuously increasing demands for higher speed and lower power communication systems, efficient VLSI implementations of those error correction codes have great importance for practical applications. In this thesis, several...
Resource Type:: Masters Thesis

Comparison and impact of substrate noise due to clocked and clockless circuitry

Schöpfer:: Le, Jim K.
Abstract:: Delay insensitive asynchronous circuitry provides significant advantages with respect to substrate noise due to localized switching. The differences between the substrate noise from NULL Convention Logic (NCL) and traditional Clocked Boolean Logic (CBL) are described and analyzed based on measured results. A test chip fabricated in the TSMC 0.25 um...
Resource Type:: Masters Thesis

Single-level dynamic register caching architecture for high-performance superscalar processors

Schöpfer:: Liebert, John A.
Abstract:: The amount of instruction level parallelism (ILP) that can be exploited depends greatly on the size of the instruction window and the number of in-flight instructions the processor can support. However, this requires a register file with a large set of physical registers for renaming and multiple ports to provide...
Resource Type:: Masters Thesis

Scaled modeling and simulation of ocean wave linear generator buoy systems

Schöpfer:: Gore, Ganesh P.
Abstract:: Accurate scaled modeling and simulation are critical to advancing ocean wave linear generator buoys. A 100th scaled model of ocean wave generator buoy systems is analyzed by solving the Navier-Stokes equations. These equations are numerically solved using Computational Fluid Dynamics (CFD) by implementing the front capturing method. In this thesis,...
Resource Type:: Masters Thesis

A channelized digital receiver design for UWB sytems in a multipath indoor environment

Schöpfer:: Chang, Yuhao
Abstract:: This thesis presents a channelized digital receiver design for UWB sytems in a multipath indoor environment. The UWB technology has been used for commercial and military purposes due to a number of advantages such as low-power consumption, noise-like and carrier free. The energy of UWB signal is spread over a...
Resource Type:: Masters Thesis

Noise optimization for low-voltage CMOS audio preamplifier systems

Schöpfer:: Brown, Matthew Eugene
Abstract:: There is a large and growing market for portable consumer audio products with very small size. As the size of these products is reduced, the area occupied by batteries becomes significant and hence limits the number of batteries to one. In order to build such small products, high levels of...
Resource Type:: Masters Thesis

A comparative study of lowpass continuous-time delta-sigma modulators with pulse-shaped DACs

Schöpfer:: Fang, Jie
Abstract:: Recently, continuous-time ΔΣ modulators are appearing increasingly often in both the literature and the marketplace due to their features of inherent antialiasing and relaxed requirements for opamp and so on. However, several nonideal factors such as clock jitter, excess loop delay, inter-symbol interference and so on, degrade the SNR performance...
Resource Type:: Masters Thesis

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