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Electrical & Computer Engineering News, Georgia Southern University

Electrical & Computer Engineering News (2014-2023)

• Lim receives Biomedical Seed Grant with Augusta University to Improve Sleep Quality Monitoring for Patients with Parkinson's Disease

A Genetic Algorithm For Asic Floorplanning, Anvesh Kumar Perumalla

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Semiconductor integrated circuits (ICs) have become key components in almost every aspect of our daily lives. From simple home appliances to extremely sophisticated aerospace systems, we have become increasingly dependent on ICs. System-on-chip (SoC) is an IC methodology that includes multiple design technologies on a single IC chip. SoC was developed to further integrate and manage system complexity. Due to SoC and increasingly dense IC fabrication technologies, design time and thereby system time-to-market are becoming more critical drivers of the IC design cycle. In order to address issues related to design time and time-to-market, highly optimized semiconductor intellectual property (IP) …

Accelerated Hyperspectral Unmixing With Endmember Variability Via The Sum-Product Algorithm, Charan Puladas

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The rich spectral information captured by hyperspectral sensors has given rise to a number of remote sensing applications, ranging from vegetative assessment and crop health monitoring, to military surveillance and combatant identification. However, due to limited spatial resolution, multiple ground materials generally contribute, i.e. mix, to form the spectrum recorded for a single pixel. The unmixing problem considers the inverse problem of determining the underlying material spectra, called endmembers, from sensor measurements. While classical unmixing approaches were deterministic in nature and did not attempt to identify in-scene materials, recent methods use labeled training data to generate statistical models of endmember …

An Approach To Implement Kahn's Technique With Dynamic Power Supply, Sowjanya Kommu

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Radio-frequency power amplifiers are an integral part of today's communication systems. Primary importance is given to improve its efficiency and linearity, which are required for the effective signal transmission. Three main architectures on which, the efficiency of communication systems are based on are: (a) Kahn's technique, (b) Doherty's power amplifiers, and (c) Cheireix out-phasing modulation. Several schemes to implement these techniques exist in literature and their study is very diverse. In this thesis, a detailed literature survey on these techniques is presented, which includes their operation, properties, advantages, disadvantages, and areas of potential applications. This main objective of this thesis …

Probabilistic Svm For Open Set Automatic Target Recognition On High Range Resolution Radar Data, Jason Daniel Roos

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The application of Automatic Target Recognition (ATR) on High Range Resolution (HRR) radar data in a scenario that contains unknown targets is of great interest for military and civilian applications. HRR radar data provides greater resolution of a target as well as the ability to perform ATR on a moving target, which gives it an advantage over other imaging systems. With the added resolution of HRR comes the disadvantage that a change in the aspect angle or orientation results in greater changes in the collected data, making classical ATR more difficult. Closed set ATR on HRR radar data is defined …

Motion Planning And Control Of Differential Drive Robot, Kaamesh Kothandaraman

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Motion planning and control of a differential drive robot in a supervised environment is presented in this thesis. Differential drive robot is a mobile robot with two driving wheels in which the overall velocity is split between left and right wheels. Kinematic equations are derived and implemented in Simulink to observe the theoretical working principle of the robot. A proportional controller is designed to control the motion of the robot, which is later implemented on a physical robot. Combination of linear velocity and orientation generates individual wheel velocities which are sent to the robot by wireless communication for its motion. …

Modular Multi-Signal Tracking Pulse Descriptor Word (Pdw) Generator With Field Programmable Gate Array (Fpga) Implementation, Justin Darrell Pelan

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As signal spectra become dense, the task of tracking and identifying radars becomes increasingly cumbersome. The variety of radars in modern theaters of war compound the task due to simultaneous operation. Real-time processing of large data sets prove difficult for sequential systems, and the parallelism of Field Programmable Gate Arrays (FPGAs) becomes an attractive option. To mitigate the increasing complexity of this task, this design proposes an FPGA architecture to produce pulse descriptor words (PDW) for up to eight independent radio frequency signals that can be used in near-real-time processing. Focusing on digital hardware techniques and modular design allow for …

Tunable C Band Coupled-C Bpf With Resonators Using Active Capacitor And Inductor, Yu Wang

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In this thesis, a classic second-order coupled-capacitor Chebyshev bandpass filter with resonators using active capacitor and inductor is presented. The low cost and small size of CMOS active components makes the band pass filter (BPF) attractive in fully-integrated CMOS applications. The active capacitor is designed to compensate active inductor's resistance for resistive match in the resonator. Meanwhile, adjusting design parameter of the active component provides BPF tunability in center frequency, pass band and pass band gain. Designed in 1.8V 180 nanometer CMOS process, the BPF has a tuning frequency range of 758-864 MHz, a controllable pass band of 7.1-65.9 MHz, …

1-Ghz Cmos Analog Signal Squaring Circuit, Lizhong He

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In analog signal processing the squaring circuit represents the core for implementing an analog signal having a value representing the square of the input signal. For example, calculating the square of input signal is necessary in adaptive processing of an input signal based on its instantaneous root mean square value. In this thesis, a new 1-Ghz analog signal squaring circuit (squarer) designed in 180 nanometer CMOS process is presented. It is implemented by CMOS components including current source, current mirror, differential amplifier, low-pass filter, and voltage output buffer. A gain control amplifier and a 10-bit ADC are set up to …

Leaky Wave Antenna, Pradyumna Aditya

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The main radiation mechanism in a leaky wave antenna is a travelling wave in a guided structure. The main characteristics of a leaky wave antenna are: light weight, easy to fabricate. Leaky wave antennas have been in use since the 1940s. In this thesis, a portable and powerful leaky-wave antenna is designed, implemented, and demonstrated for scanning application. We change the guiding structure by applying a high dielectric constant material to produce a low-cost, small size, light weight, and high sensitivity leaky-wave antenna. The designed antenna can reach large scan angles with small frequency tuned. High scanning angles can be …

Fpga Realization Of Low Register Systolic Multipliers Over Gf(2^M), Qiliang Shao

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Finite field multiplication over GF(2^m) is a critical component for elliptic curve cryptography (ECC). National Institute of Standards and Technology (NIST) has recommended five polynomials (two trinomials and three pentanomials) for ECC implementation. Although there are a lot reports available on polynomial basis multipliers, efficient implementation of a design with flexible field-size is quite rare. There is another basis to represent the field called normal basis. Normal basis multiplication over GF(2^m) is widely used in various applications such as elliptic curve cryptography (ECC). As a special class of normal basis with low complexity, Gaussian normal basis (GNB) has received considerable …

Fuzzy Control Of A Hyperloop Mass Transit System, Joseph D. Plantz

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Fuzzy logic control of a Hyperloop is carried out in this thesis. Hyperloop is being described hypothetically as a fifth mode of mass transportation and is a registered trademark of Space Exploration Technologies Corporation (SpaceX). To inspire others to help in its development and make it a reality, the Hyperloop is being explored as open-source technology by SpaceX. In this thesis a near friction-less track is constructed and is fixed inside a tunnel. External fans are used to produce air pressure inside the tunnel to propel the vehicle down the track. Fuzzy Logic Control is used to stop the vehicle …

Implementation Of Logic Fault Tolerance On A Dynamically Reconfigurable Fpga, Kiran Jayarama

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Relative to integrated circuit (IC) systems, on-chip fault detection entails determi- nation of whether or not a fault exists. The cause of the fault could be some faulty logic resource or some faulty interconnect (wiring) resource, but typically, fault detection only determines if a fault exists, not what exactly is faulty. Beyond pure fault detection some work has been done relative to on-chip fault analysis to fur- ther determine not only if a fault exists, but exactly what is faulty. Even less work has been done to actually tolerate faulty resources once they have been found. For this work, we …

Designing And Simulation Of Various Class-F Radio-Frequency Power Amplifier, Varun Pundhir

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In this thesis, the various kinds of Class-F radio frequency power amplifiers are discussed. The Class-F3 RFPA is the one which has been designed and analyzed. It consists of an RF choke, blocking capacitor and a loading network. The loading network consists of a tank circuit resonating at fundamental operating frequency and also a parallel resonator circuit tuned to third harmonic. For a better understanding of the operation of Class-F3 amplifier, we go back to Class-C amplifier and discuss it briefly. Here the design remains same, operating at conduction angles less than 180 degree. The design equations were used to …

Electrical Characterization And Applications Of Supercapacitors, Avinash Lanka

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Supercapacitors have become reliable energy sources in a wide variety of applications such as automobiles, portable electronics, recreational sports equipment, medical equipment, aerospace power supplies, etc. Typically, these are electrochemical capacitors with high values of capacitance (tens or hundreds of farads) and possess the characteristics of both traditional electrolytic capacitors and batteries. They are also known as Ultra-capacitors or Electrical Double Layer Capacitors. They work on the principle of electrical double layer for charge storage. Supercapacitor have a much higher energy and power stored per unit volume over conventional capacitors. They also exhibit longer shelf life and cycle life over …

An Electrolytic Capacitor-Less Approach To Eliminating Flicker In Led Lighting, Alex M. Kavouras Sr.

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In today's lighting industry, there is a high demand for quality, long-lasting light bulbs. Light emitting diodes offer the means for long-life bulbs, while producing a quality output. The issue with the current state of solid-state lighting is how to drive LEDs and maintain their full potential. Many solutions offer either a long-life bulb or a high quality output. The trade-off for a long-lasting bulb typically comes with an output quality that is visibly or invisibly flickering. In order to effectively eliminate flicker from the output of the LED, a large output capacitor is needed. An electrolytic capacitor is a …

Multi-Carrier Radar For Target Detection And Communications, John David Ellinger

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This dissertation considers the optimization of radar performance within the structure imposed by a coded Orthogonal Frequency Division Multiplexing (OFDM) format required to achieve an acceptable communication link. The dual goal of achieving both satisfactory radar and communication performance raises challenges that can be substantively addressed by combining phase coding and modulation techniques to provide the temporal and spectral structure necessary to implement simultaneous radar and communication operations. In particular, the specific techniques, as introduced within this dissertation, of using the Multi-Frequency Complementary Phase Coded (MCPC) sequences, as prescribed by Levanon and Mozeson, for simultaneous radar and wireless communication operations …

Growth And Characterization Of Molybdenum Disulfide Thin Films, Carl Morris Gross Iii

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Two-dimensional materials, or materials that are only one atomic layer thick, have seen much research in recent years because of their interesting electrical properties. The first of these materials, graphene, was found to have incredible electrical properties but lacked a bandgap in intrinsic films. Without a bandgap, graphene cannot create transistors that can be shut off. Molybdenum disulfide, however, is a two-dimensional semiconductor with a large bandgap. The main issue of molybdenum disulfide is that synthesized films are a much lower quality than their exfoliated counterparts. For molybdenum disulfide to be able to be used practically, a method of synthesis …

Fpga Realization Of Low Register Systolic All One-Polynomial Multipliers Over Gf (2M) And Their Applications In Trinomial Multipliers, Pingxiuqi Chen

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All-one-polynomial (AOP)-based systolic multipliers over GF (2m) are usually not con-sidered for practical implementation of cryptosystems such as elliptic curve cryptography (ECC) due to security reasons. Besides that, systolic AOP multipliers usually suer from the problem of high register-complexity, especially in field-programmable gate array (FPGA) platforms where the register resources are not that abundant. In this thesis, however, we have shown that the AOP-based systolic multipliers can easily achieve low register-complexity implementations and the proposed architectures can be employed as computation cores to derive ecient implementations of systolic Montgomery multipli-ers based on trinomials, which are recommended by the National Institute …