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University of Colorado
1.
Mysore Balasubramanya, Naveen.
Interference Time Analysis for a Cognitive Radio on an Unmanned Aircraft.
Degree: MS, Electrical, Computer & Energy Engineering, 2010, University of Colorado
URL: https://scholar.colorado.edu/ecen_gradetds/14 
► This thesis considers a model consisting of a cognitive radio (CR) on an unmanned aircraft (UA) and a network of licensed primary users on…
(more)
▼ This thesis considers a model consisting of a cognitive radio (CR) on an unmanned aircraft (UA) and a network of licensed primary users on the ground. The cognitive radio uses the same frequency spectrum as the primary users for its operation and hence acts as an interferer. This work analyzes the duration of interference in such a model. It defines two important metrics – the interference radius and the detection radius. The interference radius determines the boundary of the area within which a primary user might be subjected to harmful interference due to the operation of the CR. The detection radius determines the boundary of the area within which the presence of a primary user might be detected by the CR. The interference and detection radii might vary due to the dynamic nature of the radio environment. This thesis derives the dependence of these metrics on the radio propagation parameters like antenna gain, antenna height, path-loss exponents, etc. It uses these metrics and characterizes the model using an M/G/infinity queue to determine the statistics of the interference time for the entire excursion of the unmanned aircraft. The key statistics determined are the distribution of the duration of interference periods, the mean and the total interference time. Firstly, this work analyzes a 1D system model where the primary users are distributed randomly along a straight line. The results are then extended to a 2D system where the primary users are distributed randomly over an area. The analysis is carried out for both sparsely-dense and highly-dense primary user ground network. This work gives a new dimension to analyze the effects of interference in terms of duration of interference. It also shows how these interference effects can be minimized on enhancing the detection capability of the cognitive radio. The results from this work can be used to determine the optimum setting for the cognitive radio system such that it restrains the duration of interference below tolerable limits.
Advisors/Committee Members: Timothy X Brown, Youjian (Eujene) Liu, Juan Restrepo.
Subjects/Keywords: cognitive radio; detection capability; duration of interference; interference analysis; M/G/infinity queue; unmanned aircraft; Aviation; Electrical and Computer Engineering
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APA (6th Edition):
Mysore Balasubramanya, N. (2010). Interference Time Analysis for a Cognitive Radio on an Unmanned Aircraft. (Masters Thesis). University of Colorado. Retrieved from https://scholar.colorado.edu/ecen_gradetds/14
Chicago Manual of Style (16th Edition):
Mysore Balasubramanya, Naveen. “Interference Time Analysis for a Cognitive Radio on an Unmanned Aircraft.” 2010. Masters Thesis, University of Colorado. Accessed January 24, 2021.
https://scholar.colorado.edu/ecen_gradetds/14.
MLA Handbook (7th Edition):
Mysore Balasubramanya, Naveen. “Interference Time Analysis for a Cognitive Radio on an Unmanned Aircraft.” 2010. Web. 24 Jan 2021.
Vancouver:
Mysore Balasubramanya N. Interference Time Analysis for a Cognitive Radio on an Unmanned Aircraft. [Internet] [Masters thesis]. University of Colorado; 2010. [cited 2021 Jan 24].
Available from: https://scholar.colorado.edu/ecen_gradetds/14.
Council of Science Editors:
Mysore Balasubramanya N. Interference Time Analysis for a Cognitive Radio on an Unmanned Aircraft. [Masters Thesis]. University of Colorado; 2010. Available from: https://scholar.colorado.edu/ecen_gradetds/14
University of Colorado
2.
Rameshkrishnaa, Gokul.
Position Determination in CDMA Networks using Pilot Beacons.
Degree: MS, 2010, University of Colorado
URL: https://scholar.colorado.edu/tlen_gradetds/2
► The FCC E-911 mandate places strict requirements on the accuracy and precision of mobile telephone user positioning. When in the open, with a clear…
(more)
▼ The FCC E-911 mandate places strict requirements on the accuracy and precision of mobile telephone user positioning. When in the open, with a clear view of the sky, these requirements are met satisfactorily by using a combination of ranging measurements to the Global Positioning System (GPS) satellites. GPS measurements are generally not available when in a tunnel or inside a building. In these conditions, the network and mobile rely solely on ranging to base stations in the neighborhood of the mobile device. Accuracies suffer when insufficient base station measurements are available to the mobile.
Currently, there is no viable solution to the problem of poor indoor positioning performance. Alternatives include Wi-Fi RF fingerprinting. This solution is applicable exclusively to indoor positioning and would require standardization before it can be deployed for E-911. Wi-Fi fingerprinting is an expensive and time consuming process. This leads to the question of whether further improvements can be extracted from the current technology?
This research investigates an alternative solution for CDMA networks that is compliant with existing standards and is relatively simpler to deploy since it does not require an upgrade of the user's mobile handset capabilities. Experiments were conducted to determine the efficacy of using pilot beacons to improve the positioning of mobile users within indoor environments. The test bed and the theory of pilot beacons for aiding position determination of CDMA cellular users is described. The results of the testing indicate that pilot beacons can improve the accuracy of positioning cellular terminals in an indoor environment.
Advisors/Committee Members: Kenneth Baker, Timothy X Brown, Thomas Schwengler.
Subjects/Keywords: CDMA; LBS; Pilot Beacons; Positioning; Electrical and Computer Engineering; Electrical and Electronics; Public Affairs, Public Policy and Public Administration; Science and Technology Policy
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APA (6th Edition):
Rameshkrishnaa, G. (2010). Position Determination in CDMA Networks using Pilot Beacons. (Masters Thesis). University of Colorado. Retrieved from https://scholar.colorado.edu/tlen_gradetds/2
Chicago Manual of Style (16th Edition):
Rameshkrishnaa, Gokul. “Position Determination in CDMA Networks using Pilot Beacons.” 2010. Masters Thesis, University of Colorado. Accessed January 24, 2021.
https://scholar.colorado.edu/tlen_gradetds/2.
MLA Handbook (7th Edition):
Rameshkrishnaa, Gokul. “Position Determination in CDMA Networks using Pilot Beacons.” 2010. Web. 24 Jan 2021.
Vancouver:
Rameshkrishnaa G. Position Determination in CDMA Networks using Pilot Beacons. [Internet] [Masters thesis]. University of Colorado; 2010. [cited 2021 Jan 24].
Available from: https://scholar.colorado.edu/tlen_gradetds/2.
Council of Science Editors:
Rameshkrishnaa G. Position Determination in CDMA Networks using Pilot Beacons. [Masters Thesis]. University of Colorado; 2010. Available from: https://scholar.colorado.edu/tlen_gradetds/2
University of Colorado
3.
Legel, Lance.
Parallelized Deep Neural Networks for Distributed Intelligent Systems.
Degree: MS, 2013, University of Colorado
URL: https://scholar.colorado.edu/tlen_gradetds/19
► We present rigorous analysis of distributed intelligent systems, particularly through work on large-scale deep neural networks. We show how networks represent functions, and examine…
(more)
▼ We present rigorous analysis of distributed intelligent systems, particularly through work on large-scale deep neural networks. We show how networks represent functions, and examine how all functions and physical systems can be learned by an infinite number of neural networks. Stressing dimensionality reduction as key to network optimization, we study encoding, energy minimization, and topographic independent components analysis. We explain how networks can be parallelized along local receptive fields by asynchronous stochastic gradient descent, and how robustness can increase with adaptive subgradients. We show how communication latency across an InfiniBand cluster grows linearly with number of computers, a positive result for large-scale parallelization of neural networks via message passing. We also present results of a topographic hierarchical network model of the human visual cortex on the NYU Object Recognition Benchmark.
Advisors/Committee Members: Timothy X. Brown, Randall O’Reilly, Michael Mozer.
Subjects/Keywords: deep neural networks; distributed intelligent systems; object recognition; parallel computing; Artificial Intelligence and Robotics; Communication Technology and New Media; Neuroscience and Neurobiology
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APA (6th Edition):
Legel, L. (2013). Parallelized Deep Neural Networks for Distributed Intelligent Systems. (Masters Thesis). University of Colorado. Retrieved from https://scholar.colorado.edu/tlen_gradetds/19
Chicago Manual of Style (16th Edition):
Legel, Lance. “Parallelized Deep Neural Networks for Distributed Intelligent Systems.” 2013. Masters Thesis, University of Colorado. Accessed January 24, 2021.
https://scholar.colorado.edu/tlen_gradetds/19.
MLA Handbook (7th Edition):
Legel, Lance. “Parallelized Deep Neural Networks for Distributed Intelligent Systems.” 2013. Web. 24 Jan 2021.
Vancouver:
Legel L. Parallelized Deep Neural Networks for Distributed Intelligent Systems. [Internet] [Masters thesis]. University of Colorado; 2013. [cited 2021 Jan 24].
Available from: https://scholar.colorado.edu/tlen_gradetds/19.
Council of Science Editors:
Legel L. Parallelized Deep Neural Networks for Distributed Intelligent Systems. [Masters Thesis]. University of Colorado; 2013. Available from: https://scholar.colorado.edu/tlen_gradetds/19
University of Colorado
4.
Saint, Martin.
Cyber-Physical Systems for Critical Infrastructure Protection: A Wireless Sensor Network Application for Electric Grid Monitoring.
Degree: MS, 2013, University of Colorado
URL: https://scholar.colorado.edu/tlen_gradetds/20
► Critical infrastructure includes resources which are essential to the function of society. Despite an increased focus on protecting U.S. critical infrastructure, some sectors including…
(more)
▼ Critical infrastructure includes resources which are essential to the function of society. Despite an increased focus on protecting U.S. critical infrastructure, some sectors including the electric grid are more vulnerable than ever. Existing critical infrastructure protection (CIP) regulations and the monitoring and control systems used to achieve them have not met performance expectations. This indicates that the next generation of grid control should explore new architectures.
This thesis explores the question of whether a cyber-physical system in the form of wireless sensor networks can be used to improve CIP. We examine efforts by others to design a wireless sensor module for monitoring transmission and distribution lines, and note that this work includes little information about the performance of the communications subsystem. Laboratory testing of throughput and reliability for one example communication network are undertaken here, along with consideration of the short message service as one alternative for backhauling sensor data.
Advisors/Committee Members: Sharon K. Black, Timothy X. Brown, Frank S. Barnes.
Subjects/Keywords: cyber-physical; network; sensor; wireless; Communication Technology and New Media; Computer Sciences; Power and Energy
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APA (6th Edition):
Saint, M. (2013). Cyber-Physical Systems for Critical Infrastructure Protection: A Wireless Sensor Network Application for Electric Grid Monitoring. (Masters Thesis). University of Colorado. Retrieved from https://scholar.colorado.edu/tlen_gradetds/20
Chicago Manual of Style (16th Edition):
Saint, Martin. “Cyber-Physical Systems for Critical Infrastructure Protection: A Wireless Sensor Network Application for Electric Grid Monitoring.” 2013. Masters Thesis, University of Colorado. Accessed January 24, 2021.
https://scholar.colorado.edu/tlen_gradetds/20.
MLA Handbook (7th Edition):
Saint, Martin. “Cyber-Physical Systems for Critical Infrastructure Protection: A Wireless Sensor Network Application for Electric Grid Monitoring.” 2013. Web. 24 Jan 2021.
Vancouver:
Saint M. Cyber-Physical Systems for Critical Infrastructure Protection: A Wireless Sensor Network Application for Electric Grid Monitoring. [Internet] [Masters thesis]. University of Colorado; 2013. [cited 2021 Jan 24].
Available from: https://scholar.colorado.edu/tlen_gradetds/20.
Council of Science Editors:
Saint M. Cyber-Physical Systems for Critical Infrastructure Protection: A Wireless Sensor Network Application for Electric Grid Monitoring. [Masters Thesis]. University of Colorado; 2013. Available from: https://scholar.colorado.edu/tlen_gradetds/20
University of Colorado
5.
Espinoza, David.
Design of an Electro-Optic Modulator for High Speed Communications.
Degree: MS, 2011, University of Colorado
URL: https://scholar.colorado.edu/tlen_gradetds/22
► The telecommunications and computer technology industries have been requiring higher communications speeds at all levels for devices, components and interconnected systems. Optical devices and…
(more)
▼ The telecommunications and computer technology industries have been requiring higher communications speeds at all levels for devices, components and interconnected systems. Optical devices and optical interconnections are a viable alternative over other traditional technologies such as copper-based interconnections. Latency reductions can be achieved through the use of optical interconnections. Currently, a particular architecture for optical interconnections is being studied at the
University of
Colorado at Boulder in the EMT/NANO project, called Broadcast Optical Interconnects for Global Communication in Many-Core Chip Multiprocessor.
As with most types of networks, including optical networks, one of the most important components are modulators. Therefore adequate design and fabrication techniques for modulators contribute to higher modulation rates which lead to improve the efficiency and reductions in the latency of the optical network. Electro-optical modulators are presented in this study as an alternative to achieve this end.
In recent years, nonlinear optical (NLO) materials have been used for the fabrication of high-speed electro-optical modulators. Polymers doped with chromophores are an alternative among NLO materials because they can develop large electro-optic coefficients and low dielectric constants. These two factors are critical for achieving high-speed modulation rates. These polymer-based electro-optical modulators can be fabricated using standard laboratory techniques, such as polymer spin-coating onto substrates, UV bleaching to achieve a refractive index variation and poling techniques to align the chromophores in cured polymers.
The design of the electro-optic modulators require the use of the optical parameters of the materials to be used. Therefore the characterization of these materials is a required previous step. This characterization is performed by the fabrication of chromophores-doped polymer samples and conducting transmission and reflection measurements to obtain the optical density. Then, using the Kramer-Kronig analysis, the refractive index change can be calculated. Another measured parameter is the electro-optic coefficient. After obtaining these optical and electric parameters, they are used as inputs in the Computer Aid Design (CAD) software COMSOL Multiphysics to carry out the simulation of the modes of the waveguide.
Finally, an analysis of nanotechnology and nanophotonics in telecommunications can show us how the design of optical devices using NLO materials fits in a much larger technological area. It is important to have an understanding of the industry that this technology is a part of. A roadmap for nanophotonics shows where this technology is going and what kind of technological constraints or needs it can solve.
Advisors/Committee Members: Alan Mickelson, Timothy X. Brown, Wounjung Park.
Subjects/Keywords: 1550; chomophore; electro-optic effect; half wave plate; modulator; polymer; Electrical and Computer Engineering; Polymer Science; Semiconductor and Optical Materials
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APA (6th Edition):
Espinoza, D. (2011). Design of an Electro-Optic Modulator for High Speed Communications. (Masters Thesis). University of Colorado. Retrieved from https://scholar.colorado.edu/tlen_gradetds/22
Chicago Manual of Style (16th Edition):
Espinoza, David. “Design of an Electro-Optic Modulator for High Speed Communications.” 2011. Masters Thesis, University of Colorado. Accessed January 24, 2021.
https://scholar.colorado.edu/tlen_gradetds/22.
MLA Handbook (7th Edition):
Espinoza, David. “Design of an Electro-Optic Modulator for High Speed Communications.” 2011. Web. 24 Jan 2021.
Vancouver:
Espinoza D. Design of an Electro-Optic Modulator for High Speed Communications. [Internet] [Masters thesis]. University of Colorado; 2011. [cited 2021 Jan 24].
Available from: https://scholar.colorado.edu/tlen_gradetds/22.
Council of Science Editors:
Espinoza D. Design of an Electro-Optic Modulator for High Speed Communications. [Masters Thesis]. University of Colorado; 2011. Available from: https://scholar.colorado.edu/tlen_gradetds/22
University of Colorado
6.
Jaroonvanichkul, Suppapol.
Policy-based Cognitive Radios for Unmanned Aircraft Systems Command and Control.
Degree: MS, 2012, University of Colorado
URL: https://scholar.colorado.edu/tlen_gradetds/12
► There is increasing interest in Unmanned Aircraft Systems (UAS) as they can be used for various applications, such as border patrol and real estate…
(more)
▼ There is increasing interest in Unmanned Aircraft Systems (UAS) as they can be used for various applications, such as border patrol and real estate photography. However, currently the widespread integration of UAS into the U.S. National Airspace System (NAS) is prevented by several problems. One such problem relates to the radio spectrum for Command and Control (C2), which is the communication link between the Ground Control Station and the Unmanned Aircraft for controlling the aircraft remotely. There are two aspects of the UAS spectrum problem: spectrum scarcity and static spectrum management. First, there is currently no dedicated spectrum for civilian UAS C2. Second, the static approach to spectrum management, where spectrum is assigned for long periods of time over large regions, makes spectrum underutilized for most of the times although it is fully allocated.
The UAS spectrum problem could be solved by the use of Policy-based Cognitive Radios. Policy-based cognitive radios could introduce innovative ways to acquire spectrum: using frequency bands otherwise neglected by UAS, spectrum leasing, and utilizing underused spectrum. Policy-based radios will also be an automatic tool to manage spectrum.
This thesis deals with the conceptual design of a policy-based cognitive radio system that could support UAS C2. The aim of this thesis is to explore the use of cognitive radios as a tool for spectrum management for UAS C2. We design a policy-based cognitive radio system to flexibly manage spectrum for UAS C2 while satisfying stakeholder requirements to support the operations of UAS. We identify requirements from the stakeholders’ perspective. We design policies’ content to flexibly define rights to use spectrum and support UAS operations. We design mechanisms to distribute policies reliably and securely. The results of this thesis could be useful to the Federal Aviation Administration (FAA) and the UAS industry in enabling more integration of UAS in the NAS. Additionally, the results of this thesis could motivate possible cognitive radio solutions in other areas such as vehicular communications or public safety.
Advisors/Committee Members: Timothy X. Brown, Douglas C. Sicker, Harvey M. Gates.
Subjects/Keywords: Policy-Based Radio; Spectrum Management; Electrical and Computer Engineering
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APA (6th Edition):
Jaroonvanichkul, S. (2012). Policy-based Cognitive Radios for Unmanned Aircraft Systems Command and Control. (Masters Thesis). University of Colorado. Retrieved from https://scholar.colorado.edu/tlen_gradetds/12
Chicago Manual of Style (16th Edition):
Jaroonvanichkul, Suppapol. “Policy-based Cognitive Radios for Unmanned Aircraft Systems Command and Control.” 2012. Masters Thesis, University of Colorado. Accessed January 24, 2021.
https://scholar.colorado.edu/tlen_gradetds/12.
MLA Handbook (7th Edition):
Jaroonvanichkul, Suppapol. “Policy-based Cognitive Radios for Unmanned Aircraft Systems Command and Control.” 2012. Web. 24 Jan 2021.
Vancouver:
Jaroonvanichkul S. Policy-based Cognitive Radios for Unmanned Aircraft Systems Command and Control. [Internet] [Masters thesis]. University of Colorado; 2012. [cited 2021 Jan 24].
Available from: https://scholar.colorado.edu/tlen_gradetds/12.
Council of Science Editors:
Jaroonvanichkul S. Policy-based Cognitive Radios for Unmanned Aircraft Systems Command and Control. [Masters Thesis]. University of Colorado; 2012. Available from: https://scholar.colorado.edu/tlen_gradetds/12
University of Colorado
7.
Bennett, Daniel T.
Optimal Data Scheduling of Clients Serviced using Beamforming Antennas in Mobile Scenarios.
Degree: PhD, Electrical, Computer & Energy Engineering, 2012, University of Colorado
URL: https://scholar.colorado.edu/ecen_gradetds/47
► The use of beamforming antennas has received significant attention over the last decade. I consider beamforming applied to dynamic operations such as networked UAV…
(more)
▼ The use of beamforming antennas has received significant attention over the last decade. I consider beamforming applied to dynamic operations such as networked UAV hubs which interconnect with users on the ground. The key problem involves understanding how to optimally manage the users' data requirements while considering mobility and a dynamic radio environment serviced by one or more hubs with beamforming antenna capability.
In this work I break the problem down into scheduling, tracking and ultimately execution. I develop a regularized linear programming based scheduling algorithm along with developing a very efficient scheduling with uncertainty receding horizon based relaxation and implement them along with a capacity tracking estimation algorithm. Finally I show the results of successfully implementing this system in hardware using Fidelity Comtech's Phocus Array FCI-3100X.
This implementation shows that the problem overview presented in this work provides a solid basis and defines the key components needed for a reliable electronic beamforming antenna system able to successfully service dispersed users in a mobile environment. It also shows the tools developed, refined, and integrated with respect to tracking, scheduling, and practical modifications.
Advisors/Committee Members: Timothy X Brown, Kenneth Baker, Dirk Grunwald, Youjian Liu, François Meyer.
Subjects/Keywords: Beamforming Antennas; UAV Communications; Wireless Communications; Communication Technology and New Media; Computer Engineering
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APA (6th Edition):
Bennett, D. T. (2012). Optimal Data Scheduling of Clients Serviced using Beamforming Antennas in Mobile Scenarios. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/ecen_gradetds/47
Chicago Manual of Style (16th Edition):
Bennett, Daniel T. “Optimal Data Scheduling of Clients Serviced using Beamforming Antennas in Mobile Scenarios.” 2012. Doctoral Dissertation, University of Colorado. Accessed January 24, 2021.
https://scholar.colorado.edu/ecen_gradetds/47.
MLA Handbook (7th Edition):
Bennett, Daniel T. “Optimal Data Scheduling of Clients Serviced using Beamforming Antennas in Mobile Scenarios.” 2012. Web. 24 Jan 2021.
Vancouver:
Bennett DT. Optimal Data Scheduling of Clients Serviced using Beamforming Antennas in Mobile Scenarios. [Internet] [Doctoral dissertation]. University of Colorado; 2012. [cited 2021 Jan 24].
Available from: https://scholar.colorado.edu/ecen_gradetds/47.
Council of Science Editors:
Bennett DT. Optimal Data Scheduling of Clients Serviced using Beamforming Antennas in Mobile Scenarios. [Doctoral Dissertation]. University of Colorado; 2012. Available from: https://scholar.colorado.edu/ecen_gradetds/47
University of Colorado
8.
Madhusudhanan, Prasanna.
Stochastic Geometric Modeling and Analysis of Wireless Communications Systems.
Degree: PhD, Electrical, Computer & Energy Engineering, 2013, University of Colorado
URL: https://scholar.colorado.edu/ecen_gradetds/69
► This thesis studies the interference performance of large-scale wireless communications systems. Mathematical models are developed for ad-hoc networks, cellular networks, multi-tier (heterogeneous cellular) networks,…
(more)
▼ This thesis studies the interference performance of large-scale wireless communications systems. Mathematical models are developed for ad-hoc networks, cellular networks, multi-tier (heterogeneous cellular) networks, cognitive radio networks and the massive-MIMO networks based on stochastic geometry where the nodes of the network are distributed in a space according to a spatial stochastic (random) process. Analytical characterizations for important performance metrics such as the distribution of the signal to interference plus noise ratio, outage probability, average rate, etc. are obtained for the most general channel conditions and system scenarios.
In the past the above mentioned wireless systems have been studied through large system simulations which suffer from computational infeasibilities and provide limited insights about the system. The mathematical models are shown to closely approximate the practical systems in scattering and fading rich environments. Using the tools in stochastic geometry and stochastic ordering, we demonstrate analytical tractability of these models and closed-form characterizations of important performance metrics of the systems. The tools developed in this work can be used to characterize the achievable performance gains with interference mitigation techniques employed in 4G LTE such as fractional frequency reuse, relays, multi-cell coordination and in the study of MIMO and secrecy networks.
Advisors/Committee Members: Timothy X Brown, Youjian Liu, Francois G. Meyer, Juan G. Restrepo, Sayandev Mukherjee.
Subjects/Keywords: Fading Channels; Interference characteristics; Massive MIMO; Poisson processes; Stochastic geometry; Wireless communications; Electrical and Computer Engineering
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APA (6th Edition):
Madhusudhanan, P. (2013). Stochastic Geometric Modeling and Analysis of Wireless Communications Systems. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/ecen_gradetds/69
Chicago Manual of Style (16th Edition):
Madhusudhanan, Prasanna. “Stochastic Geometric Modeling and Analysis of Wireless Communications Systems.” 2013. Doctoral Dissertation, University of Colorado. Accessed January 24, 2021.
https://scholar.colorado.edu/ecen_gradetds/69.
MLA Handbook (7th Edition):
Madhusudhanan, Prasanna. “Stochastic Geometric Modeling and Analysis of Wireless Communications Systems.” 2013. Web. 24 Jan 2021.
Vancouver:
Madhusudhanan P. Stochastic Geometric Modeling and Analysis of Wireless Communications Systems. [Internet] [Doctoral dissertation]. University of Colorado; 2013. [cited 2021 Jan 24].
Available from: https://scholar.colorado.edu/ecen_gradetds/69.
Council of Science Editors:
Madhusudhanan P. Stochastic Geometric Modeling and Analysis of Wireless Communications Systems. [Doctoral Dissertation]. University of Colorado; 2013. Available from: https://scholar.colorado.edu/ecen_gradetds/69
University of Colorado
9.
Corbin, Charles David.
Assessing Impact of Large-Scale Distributed Residential HVAC Control Optimization on Electricity Grid Operation and Renewable Energy Integration.
Degree: PhD, 2014, University of Colorado
URL: https://scholar.colorado.edu/cven_gradetds/460
► Demand management is an important component of the emerging Smart Grid, and a potential solution to the supply-demand imbalance occurring increasingly as intermittent renewable electricity…
(more)
▼ Demand management is an important component of the emerging Smart Grid, and a potential solution to the supply-demand imbalance occurring increasingly as intermittent renewable electricity is added to the generation mix. Model predictive control (MPC) has shown great promise for controlling HVAC demand in commercial buildings, making it an ideal solution to this problem. MPC is believed to hold similar promise for residential applications, yet very few examples exist in the literature despite a growing interest in residential demand management. This work explores the potential for residential buildings to shape electric demand at the distribution feeder level in order to reduce peak demand, reduce system ramping, and increase load factor using detailed sub-hourly simulations of thousands of buildings coupled to distribution power flow software. More generally, this work develops a methodology for the directed optimization of residential HVAC operation using a distributed but directed MPC scheme that can be applied to today's programmable thermostat technologies to address the increasing variability in electric supply and demand. Case studies incorporating varying levels of renewable energy generation demonstrate the approach and highlight important considerations for large-scale residential model predictive control.
Advisors/Committee Members: Gregor P. Henze, Michael J. Brandemuehl, Timothy X. Brown, Moncef Krarti, Clemens Felsmann.
Subjects/Keywords: demand response; electric grid; heating ventilating and air conditioning; model predictive control; optimization; residential buildings; Architectural Engineering; Engineering; Power and Energy
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APA (6th Edition):
Corbin, C. D. (2014). Assessing Impact of Large-Scale Distributed Residential HVAC Control Optimization on Electricity Grid Operation and Renewable Energy Integration. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/cven_gradetds/460
Chicago Manual of Style (16th Edition):
Corbin, Charles David. “Assessing Impact of Large-Scale Distributed Residential HVAC Control Optimization on Electricity Grid Operation and Renewable Energy Integration.” 2014. Doctoral Dissertation, University of Colorado. Accessed January 24, 2021.
https://scholar.colorado.edu/cven_gradetds/460.
MLA Handbook (7th Edition):
Corbin, Charles David. “Assessing Impact of Large-Scale Distributed Residential HVAC Control Optimization on Electricity Grid Operation and Renewable Energy Integration.” 2014. Web. 24 Jan 2021.
Vancouver:
Corbin CD. Assessing Impact of Large-Scale Distributed Residential HVAC Control Optimization on Electricity Grid Operation and Renewable Energy Integration. [Internet] [Doctoral dissertation]. University of Colorado; 2014. [cited 2021 Jan 24].
Available from: https://scholar.colorado.edu/cven_gradetds/460.
Council of Science Editors:
Corbin CD. Assessing Impact of Large-Scale Distributed Residential HVAC Control Optimization on Electricity Grid Operation and Renewable Energy Integration. [Doctoral Dissertation]. University of Colorado; 2014. Available from: https://scholar.colorado.edu/cven_gradetds/460
University of Colorado
10.
Saha, Dola.
MAC-PHY Cross-layer Techniques for Simultaneous Multiuser Communication in Wireless Networks.
Degree: PhD, Computer Science, 2013, University of Colorado
URL: https://scholar.colorado.edu/csci_gradetds/58
► Layering in wireless networks provide clear abstractions to how various resources are managed for a particular communication link. However, the unpredictability of the wireless…
(more)
▼ Layering in wireless networks provide clear abstractions to how various resources are managed for a particular communication link. However, the unpredictability of the wireless channel presents great challenge to these clear abstractions. Often, optimizations in these layers are not transparent to others. This creates a necessity to violate the modular approach and share crosslayer information to modify each layer's functionalities, which eventually improves the overall performance of the network. In this thesis, novel MAC-PHY crosslayer protocols have been designed, implemented and evaluated. These protocols provide unprecedented gain in various aspects of a wireless network, by facilitating simultaneous multiuser communication. By harnessing the untapped potential of the various signal processing subsystems in the physical layer, these protocols are able to increase network throughput, make certain group communications faster and enable covert communication. Using reconfigurable hardware to expose physical layer information, improvement is achieved in higher layers. Furthermore, it is also important to modify the physical layer based on the feedback from higher layers. The two-way handshaking changes the conventional modular approach and allows implementation of simultaneous communication in wireless domain. To make the crosslayer techniques practical, this thesis presents clear implementation steps to embed these concepts as an extension to common wireless network protocols and evaluate those using practical experiments and radio measurements. Through these techniques we are able to show practical benefits from a mutable radio and a crosslayer approach to protocol design for next generation, high bandwidth wireless networks.
Advisors/Committee Members: Dirk Grunwald, Douglas Sicker, Timothy X Brown, Shivakant Mishra, Kenneth R. Baker.
Subjects/Keywords: Computer Sciences
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APA (6th Edition):
Saha, D. (2013). MAC-PHY Cross-layer Techniques for Simultaneous Multiuser Communication in Wireless Networks. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/csci_gradetds/58
Chicago Manual of Style (16th Edition):
Saha, Dola. “MAC-PHY Cross-layer Techniques for Simultaneous Multiuser Communication in Wireless Networks.” 2013. Doctoral Dissertation, University of Colorado. Accessed January 24, 2021.
https://scholar.colorado.edu/csci_gradetds/58.
MLA Handbook (7th Edition):
Saha, Dola. “MAC-PHY Cross-layer Techniques for Simultaneous Multiuser Communication in Wireless Networks.” 2013. Web. 24 Jan 2021.
Vancouver:
Saha D. MAC-PHY Cross-layer Techniques for Simultaneous Multiuser Communication in Wireless Networks. [Internet] [Doctoral dissertation]. University of Colorado; 2013. [cited 2021 Jan 24].
Available from: https://scholar.colorado.edu/csci_gradetds/58.
Council of Science Editors:
Saha D. MAC-PHY Cross-layer Techniques for Simultaneous Multiuser Communication in Wireless Networks. [Doctoral Dissertation]. University of Colorado; 2013. Available from: https://scholar.colorado.edu/csci_gradetds/58
University of Colorado
11.
Pearre, Ben.
Model-Free in situ Optimisation of Data-Ferried Sensor Networks.
Degree: PhD, Computer Science, 2013, University of Colorado
URL: https://scholar.colorado.edu/csci_gradetds/75
► Given multiple widespread stationary data sources (nodes), an unmanned aircraft (UA) can fly over the sensors and gather the data via a wireless link.…
(more)
▼ Given multiple widespread stationary data sources (nodes), an unmanned aircraft (UA) can fly over the sensors and gather the data via a wireless link. This is known as data ferrying or data muling, and finds application in surveillance and scientific monitoring of remote and inaccessible regions. Desiderata for such a network include competing objectives related to latency, bandwidth, power consumption by the nodes, and tolerance for imperfect environmental information. For any design objective, network performance depends upon the control policies of UA and nodes. A model of such a system permits optimal planning, but is difficult to acquire and maintain. Node locations may not be precisely known. Radio fields are directional and irregular, affected by antenna shape, occlusions, reflections, diffraction, and fading. Complex aircraft dynamics further hamper planning. The conventional approach is to plan trajectories using approximate models, but inaccuracies in the models degrades the quality of the solution. In order to provide an alternative to the process of building and maintaining detailed environmental and system models, we present a model-free learning framework for trajectory optimisation and control of node radio transmission power in UA-ferried sensor networks. We introduce policy representations that are easy both for learning algorithms to manipulate and for off-the-shelf autopilots and radios to work with. We show that the policies can be optimised through direct experience with the environment. To speed and stabilise the policy learning process, we introduce a metapolicy that learns through experience with past scenarios, transferring knowledge to new problems. Algorithms are tested using two radio propagation simulators, both of which produce irregular radio fields not commonly studied in the data-ferrying literature. The first introduces directional antennas and point noise sources. The second additionally includes interaction with terrain. Under the simpler radio simulator, the proposed algorithms generally perform within ~15% of optimal performance after a few dozen trials. Environments produced by the terrain-based simulator are more challenging, with learners generally approaching to within ~40% of optimal performance in similar time. We show that under either simulator even small modelling errors can reduce the optimal planner's performance below that of the proposed learning approach.
Advisors/Committee Members: Timothy X Brown, Eric W. Frew, Lijun Chen, Nikolaus Correll, Michael C. Mozer.
Subjects/Keywords: data ferrying; energy conservation; metalearning; reinforcement learning; trajectory optimisation; unmanned aerial vehicle (UAV); Artificial Intelligence and Robotics; Communication; Computer Sciences
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MLA ·
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APA (6th Edition):
Pearre, B. (2013). Model-Free in situ Optimisation of Data-Ferried Sensor Networks. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/csci_gradetds/75
Chicago Manual of Style (16th Edition):
Pearre, Ben. “Model-Free in situ Optimisation of Data-Ferried Sensor Networks.” 2013. Doctoral Dissertation, University of Colorado. Accessed January 24, 2021.
https://scholar.colorado.edu/csci_gradetds/75.
MLA Handbook (7th Edition):
Pearre, Ben. “Model-Free in situ Optimisation of Data-Ferried Sensor Networks.” 2013. Web. 24 Jan 2021.
Vancouver:
Pearre B. Model-Free in situ Optimisation of Data-Ferried Sensor Networks. [Internet] [Doctoral dissertation]. University of Colorado; 2013. [cited 2021 Jan 24].
Available from: https://scholar.colorado.edu/csci_gradetds/75.
Council of Science Editors:
Pearre B. Model-Free in situ Optimisation of Data-Ferried Sensor Networks. [Doctoral Dissertation]. University of Colorado; 2013. Available from: https://scholar.colorado.edu/csci_gradetds/75
University of Colorado
12.
Stachura, Maciej.
Cooperative Planning for UAS-based Sensor Networks In Realistic Communication Environments.
Degree: PhD, Aerospace Engineering Sciences, 2014, University of Colorado
URL: https://scholar.colorado.edu/asen_gradetds/77
► This dissertation develops a unified, tractable algorithm for distributed planning for multiple unmanned aircraft based sensor networks with performance bounds. An information-theoretic objective function…
(more)
▼ This dissertation develops a unified, tractable algorithm for distributed planning for multiple unmanned aircraft based sensor networks with performance bounds. An information-theoretic objective function is derived that incorporates sensing and communication to guide a cooperative team of unmanned aircraft. The communication is modelled with packet erasure channels for each link in a multi-hop mesh network. This objective is shown to be intractable and assumptions are made to find a tractable formulation. This tractable formulation is then distributed using the chain rule of mutual information and optimization algorithms are designed with performance bounds for different scenarios and compared against the fully centralized mutual information approach. This comparison is done analytically using submodularity under certain assumptions and Monte Carlo simulations to evaluate the algorithms when these assumptions break down.
A novel unmanned aircraft system platform was developed to facilitate experiments with multiple unmanned aircraft utilizing sensing and multi-hop mesh networking. This system was used to perform localization experiments of radio frequency emitters based on the received signal strength measurement. The planning algorithms were demonstrated with multiple aircraft to show there validity and tractability on a real world scenario. These experiments were used to asses the algorithms performance showing the improvement in sensing is appreciable and specifically the benefits of utilizing multi-hop communication.
Advisors/Committee Members: Eric W. Frew, Brian M. Argrow, Timothy X. Brown, Nikolaus Correll, Ute Herzfeld.
Subjects/Keywords: unmanned aircraft; sensor networks; multi-hop mesh networking; packet erasure channels; UAV; Multi-Vehicle Systems and Air Traffic Control; Navigation, Guidance, Control and Dynamics
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APA ·
Chicago ·
MLA ·
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APA (6th Edition):
Stachura, M. (2014). Cooperative Planning for UAS-based Sensor Networks In Realistic Communication Environments. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/asen_gradetds/77
Chicago Manual of Style (16th Edition):
Stachura, Maciej. “Cooperative Planning for UAS-based Sensor Networks In Realistic Communication Environments.” 2014. Doctoral Dissertation, University of Colorado. Accessed January 24, 2021.
https://scholar.colorado.edu/asen_gradetds/77.
MLA Handbook (7th Edition):
Stachura, Maciej. “Cooperative Planning for UAS-based Sensor Networks In Realistic Communication Environments.” 2014. Web. 24 Jan 2021.
Vancouver:
Stachura M. Cooperative Planning for UAS-based Sensor Networks In Realistic Communication Environments. [Internet] [Doctoral dissertation]. University of Colorado; 2014. [cited 2021 Jan 24].
Available from: https://scholar.colorado.edu/asen_gradetds/77.
Council of Science Editors:
Stachura M. Cooperative Planning for UAS-based Sensor Networks In Realistic Communication Environments. [Doctoral Dissertation]. University of Colorado; 2014. Available from: https://scholar.colorado.edu/asen_gradetds/77
University of Colorado
13.
Saint, Martin.
A Dynamic Policy License for Wireless Spectrum Management.
Degree: PhD, 2017, University of Colorado
URL: https://scholar.colorado.edu/tlen_gradetds/28
► Electromagnetic spectrum for wireless communications is fully allocated by regulatory authorities, but this does not mean that it is fully utilized. Demand for greater…
(more)
▼ Electromagnetic spectrum for wireless communications is fully allocated by regulatory authorities, but this does not mean that it is fully utilized. Demand for greater capacity and new services requires new regulatory and technical models for spectrum sharing. This thesis develops a regulatory model denoted the dynamic policy license. The dynamic policy license combines the assurances to licensees that come from holding a fixed license while maintaining regulatory flexibility. A dynamic policy license is similar to a traditional spectrum license that specifies a bandwidth, power, center frequency, location, and other parameters. However, one or more of these parameters is subject to change by the regulator over time. The allowed changes are restricted by the license to provide assurances and predictability to the licensee. The opportunities and challenges that this presents to both regulators and licensees is described. We examine, retrospectively, the application of the dynamic policy license to the case of Nextel Communications interfering with public safety communications. The resolution required several proposals by the FCC and others and over 2,200 filings by interested parties. Our license proposal is intended to provide flexibility and certainty to a variety of situations, including (1) changes in technology, demand, or use; (2) coexistence between multiple services; and (3) efficient use of spectrum over time. Spectrum issues such as allocation and allotment, assignment, service rules, and compliance and enforcement continue as contentious management issues. We suggest that existing fixed licensing models are sub-optimal, and in some cases are themselves the source of inflexibility and artificial scarcity. We contribute development of a license model that augments existing approaches across a wide range of governance models and assignment strategies. Increasing pressure on spectrum resources has prompted new approaches to spectrum sharing and coexistence. A blockchain-based smart contract in conjunction with the dynamic policy license is one approach to managing radio operations and spectrum needs. Smart contracts enable spectrum policies to move beyond static documents to become autonomous, dynamic, self-enforcing, secure, transparent, and auditable code that runs on the blockchain.
Advisors/Committee Members: Timothy X. Brown, Kenneth R. Baker, Jim Lansford, Thomas Schwengler, Marco Zennaro.
Subjects/Keywords: FCC; license; policy; regulation; spectrum; wireless; information technology; Electrical and Computer Engineering; Public Policy; Technology and Innovation
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APA ·
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APA (6th Edition):
Saint, M. (2017). A Dynamic Policy License for Wireless Spectrum Management. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/tlen_gradetds/28
Chicago Manual of Style (16th Edition):
Saint, Martin. “A Dynamic Policy License for Wireless Spectrum Management.” 2017. Doctoral Dissertation, University of Colorado. Accessed January 24, 2021.
https://scholar.colorado.edu/tlen_gradetds/28.
MLA Handbook (7th Edition):
Saint, Martin. “A Dynamic Policy License for Wireless Spectrum Management.” 2017. Web. 24 Jan 2021.
Vancouver:
Saint M. A Dynamic Policy License for Wireless Spectrum Management. [Internet] [Doctoral dissertation]. University of Colorado; 2017. [cited 2021 Jan 24].
Available from: https://scholar.colorado.edu/tlen_gradetds/28.
Council of Science Editors:
Saint M. A Dynamic Policy License for Wireless Spectrum Management. [Doctoral Dissertation]. University of Colorado; 2017. Available from: https://scholar.colorado.edu/tlen_gradetds/28
University of Colorado
14.
Carfang, Anthony John.
Cascaded Optimization for a Persistent Data Ferrying Unmanned Aircraft.
Degree: PhD, Aerospace Engineering Sciences, 2015, University of Colorado
URL: https://scholar.colorado.edu/asen_gradetds/123
► This dissertation develops and assesses a cascaded method for designing optimal periodic trajectories and link schedules for an unmanned aircraft to ferry data between…
(more)
▼ This dissertation develops and assesses a cascaded method for designing optimal periodic trajectories and link schedules for an unmanned aircraft to ferry data between stationary ground nodes. This results in a fast solution method without the need to artificially constrain system dynamics. Focusing on a fundamental ferrying problem that involves one source and one destination, but includes complex vehicle and Radio- Frequency (RF) dynamics, a cascaded structure to the system dynamics is uncovered. This structure is exploited by reformulating the nonlinear optimization problem into one that reduces the independent control to the vehicle's motion, while the link scheduling control is folded into the objective function and implemented as an optimal policy that depends on candidate motion control. This formulation is proven to maintain optimality while reducing computation time in comparison to traditional ferry optimization methods. The discrete link scheduling problem takes the form of a combinatorial optimization problem that is known to be NP-Hard. A derived necessary condition for optimality guides the development of several heuristic algorithms, specifically the Most-Data-First Algorithm and the Knapsack Adaptation. These heuristics are extended to larger ferrying scenarios, and assessed analytically and through Monte Carlo simulation, showing better throughput performance in the same order of magnitude of computation time in comparison to other common link scheduling policies. The cascaded optimization method is implemented with a novel embedded software system on a small, unmanned aircraft to validate the simulation results with field experiments. To address the sensitivity of results on trajectory tracking performance, a system that combines motion and link control with waypoint-based navigation is developed and assessed through field experiments. The data ferrying algorithms are further extended by incorporating a Gaussian process to opportunistically learn the RF environment. By continuously improving RF models, the cascaded planner can continually improve the ferrying system's overall performance.
Advisors/Committee Members: Eric W. Frew, Brian Argrow, Timothy X Brown, Derek B. Kingston, Dale A. Lawrence.
Subjects/Keywords: Data Ferry; Link Scheduling; Wireless Sensor Network; Aerospace Engineering; Applied Mathematics; Computer Sciences
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APA ·
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MLA ·
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Export
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APA (6th Edition):
Carfang, A. J. (2015). Cascaded Optimization for a Persistent Data Ferrying Unmanned Aircraft. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/asen_gradetds/123
Chicago Manual of Style (16th Edition):
Carfang, Anthony John. “Cascaded Optimization for a Persistent Data Ferrying Unmanned Aircraft.” 2015. Doctoral Dissertation, University of Colorado. Accessed January 24, 2021.
https://scholar.colorado.edu/asen_gradetds/123.
MLA Handbook (7th Edition):
Carfang, Anthony John. “Cascaded Optimization for a Persistent Data Ferrying Unmanned Aircraft.” 2015. Web. 24 Jan 2021.
Vancouver:
Carfang AJ. Cascaded Optimization for a Persistent Data Ferrying Unmanned Aircraft. [Internet] [Doctoral dissertation]. University of Colorado; 2015. [cited 2021 Jan 24].
Available from: https://scholar.colorado.edu/asen_gradetds/123.
Council of Science Editors:
Carfang AJ. Cascaded Optimization for a Persistent Data Ferrying Unmanned Aircraft. [Doctoral Dissertation]. University of Colorado; 2015. Available from: https://scholar.colorado.edu/asen_gradetds/123
University of Colorado
15.
Hakim, Shahjehan.
Radio Resource Management in Dense WiFi Networks.
Degree: MS, 2010, University of Colorado
URL: https://scholar.colorado.edu/tlen_gradetds/3
Subjects/Keywords: Automation; Networking; RF; Test bed; WiFi; Wireless; Digital Communications and Networking
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APA ·
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APA (6th Edition):
Hakim, S. (2010). Radio Resource Management in Dense WiFi Networks. (Masters Thesis). University of Colorado. Retrieved from https://scholar.colorado.edu/tlen_gradetds/3
Chicago Manual of Style (16th Edition):
Hakim, Shahjehan. “Radio Resource Management in Dense WiFi Networks.” 2010. Masters Thesis, University of Colorado. Accessed January 24, 2021.
https://scholar.colorado.edu/tlen_gradetds/3.
MLA Handbook (7th Edition):
Hakim, Shahjehan. “Radio Resource Management in Dense WiFi Networks.” 2010. Web. 24 Jan 2021.
Vancouver:
Hakim S. Radio Resource Management in Dense WiFi Networks. [Internet] [Masters thesis]. University of Colorado; 2010. [cited 2021 Jan 24].
Available from: https://scholar.colorado.edu/tlen_gradetds/3.
Council of Science Editors:
Hakim S. Radio Resource Management in Dense WiFi Networks. [Masters Thesis]. University of Colorado; 2010. Available from: https://scholar.colorado.edu/tlen_gradetds/3
. 
Open Access Theses and Dissertations