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Articles 1 - 10 of 10
Full-Text Articles in Engineering
Evaluation Of Wireless Router Antennas And 3d-Printed Simulated Antenna Designs, Bibek Kattel
Evaluation Of Wireless Router Antennas And 3d-Printed Simulated Antenna Designs, Bibek Kattel
Electronic Theses and Dissertations
As the size of the electronics devices is decreasing the overall size of the antenna inside them is also decreasing. As the antenna size becomes smaller it is more difficult to manufacture them with the process of traditional manufacturing that uses the subtractive method to manufacture a structure. This is where additive manufacturing has an edge on traditional manufacturing. The use of this method to manufacture antennas has been discussed in this thesis. Five antennas from a wireless router are evaluated by modeling them in CST Microwave Studio and are modified so that they can be manufactured with 3D printing. …
Dynamic Code Selection Method For Content Transfer In Deep Space Network, Rojina Adhikary
Dynamic Code Selection Method For Content Transfer In Deep Space Network, Rojina Adhikary
Electronic Theses and Dissertations
Space communications feature large round-trip time delays (for example, between 6.5 and 44 minutes for Mars to Earth and return, depending on the actual distance between the two planets) and highly variable data error rates, for example, bit error rate (BER) of 10−5 is very comand even higher BERs on the order of 10−1 is observed in the deep- space environment. We develop a new content transfer protocol based on RaptorQ codes and turbo codes together with a real-time channel prediction model to maximize file transfer from space vehicles to the Earth stations. While turbo codes are used to correct …
Design And Investigation Of Genetic Algorithmic And Reinforcement Learning Approaches To Wire Crossing Reductions For Pnml Devices, Alexander Keith Gunter
Design And Investigation Of Genetic Algorithmic And Reinforcement Learning Approaches To Wire Crossing Reductions For Pnml Devices, Alexander Keith Gunter
Electronic Theses and Dissertations
Perpendicular nanomagnet logic (pNML) is an emerging post-CMOS technology which encodes binary data in the polarization of single-domain nanomagnets and performs operations via fringing field interactions. Currently, there is no complete top-down workflow for pNML. Researchers must instead simultaneously handle place-and-route, timing, and logic minimization by hand. These tasks include multiple NP-Hard subproblems, and the lack of automated tools for solving them for pNML precludes the design of large-scale pNML circuits.
Raptor Codes For Biawgn Channel: Snr Mismatch And The Optimality Of The Inner And Outer Rates, Hussein Fadhel
Raptor Codes For Biawgn Channel: Snr Mismatch And The Optimality Of The Inner And Outer Rates, Hussein Fadhel
Electronic Theses and Dissertations
Fountain codes are a class of rateless codes with two interesting properties, first, they can generate potentially limitless numbers of encoded symbols given a finite set of source symbols, and second, the source symbols can be recovered from any subset of encoded symbols with cardinality greater than the number of source symbols. Raptor codes are the first implementation of fountain codes with linear complexity and vanishing error floors on noisy channels. Raptor codes are designed by the serial concatenation of an inner Luby trans-form (LT) code, the first practical realization of fountain codes, and an outer low-density parity-check (LDPC) code. …
Mac-Phy Frameworks For Lte And Wifi Networks' Coexistence Over The Unlicensed Band, Hadi Ahmad Kasasbeh
Mac-Phy Frameworks For Lte And Wifi Networks' Coexistence Over The Unlicensed Band, Hadi Ahmad Kasasbeh
Electronic Theses and Dissertations
The main focus of this dissertation is to address these issues and to analyze the interactions between LTE and WiFi coexisting on the unlicensed spectrum. This can be done by providing some improvements in the first two communication layers in both technologies. Regarding the physical (PHY) layer, efficient spectrum sensing and data fusion techniques that consider correlated spectrum sensing readings at the LTE/WiFi users (sensors) are needed. Failure to consider such correlation has been a major shortcoming of the literature. This resulted in poorly performing spectrum sensing systems if such correlation is not considered in correlated-measurements environments.
Design And Analysis Of Efficient Parallel Bayesian Model Comparison Algorithms, Robert Wesley Henderson
Design And Analysis Of Efficient Parallel Bayesian Model Comparison Algorithms, Robert Wesley Henderson
Electronic Theses and Dissertations
Bayesian model comparison provides a rational and consistent method for applying logic and probability to the problem of evaluating models. Model comparison requires numerical techniques that are usually very time consuming to run. This dissertation proposes extensions to several existing numerical model comparison techniques, including nested sampling and thermodynamic integration, that incorporate parallel algorithm design to achieve significant speed-ups. Serial computer performance gains have sloin recent years, and most processing speed improvements are seen in the area of parallel architectures. This work discusses the design, theoretical analysis, and empirical analysis of these algorithms, focusing on the performance of these algorithms …
Automation Of Data Collection From An Anechoic Chamber, Thomas S. Garner
Automation Of Data Collection From An Anechoic Chamber, Thomas S. Garner
Electronic Theses and Dissertations
This paper describes the calibration methods and the process that is used on the Ole Miss electrical engineering anechoic chamber. Furthermore the MATLAB code that operates the anechoic chamber has been updated to collect sweep data. The GUI also now includes a tab for calibration giving the user the ability to calibrate for their desired frequency range for when there is not sufficient calibration data already available.
A Study Of Cooperative Spectrum Sharing Schemes For Internet Of Things Systems, Adham Hagag
A Study Of Cooperative Spectrum Sharing Schemes For Internet Of Things Systems, Adham Hagag
Electronic Theses and Dissertations
The Internet of Things (IoT) has gained much attention in recent years with the massive increase in the number of connected devices. Cognitive Machine-to-Machine (CM2M) communications is a hot research topic in which a cognitive dimension allows M2M networks to overcome the challenges of spectrum scarcity, interference, and green requirements. In this paper, we propose a Generalized Cooperative Spectrum Sharing (GCSS) scheme for M2M communication. Cooperation extends the coverage of wireless networks as well as increasing their throughput while reducing the energy consumption of the connected low power devices. We study the outage performance of the proposed GCSS scheme for …
Decentralized Detection With Correlated Gaussian Observations: Parallel And Tandem Networks With Two Sensors, Shailee Yagnik
Decentralized Detection With Correlated Gaussian Observations: Parallel And Tandem Networks With Two Sensors, Shailee Yagnik
Electronic Theses and Dissertations
Signal detection in cognitive radio involves the determination of presence or absence of a primary user signal so that the secondary user may opportunistically gain access when the spectrum is unoccupied. In decentralized sensing scheme, two or more secondary users sense the spectrum, process individual observation and then pass the quantized data to a fusion center where a decision with regard to which hypothesis being true, that is, a signal being present or absent, is made. In the second part of the thesis, we study Bayes error performance of two-sensor tandem network designed to detect the presence or absence of …
An Improved 3d Complex-Envelope Four-Stage Adi-Fdtd Using The Fundamental Scheme, Qi Liu
An Improved 3d Complex-Envelope Four-Stage Adi-Fdtd Using The Fundamental Scheme, Qi Liu
Electronic Theses and Dissertations
Three corresponding reference methods are developed. The CE explicit FDTD method is used to solve the problem with a point source and perfect electric conductor (PEC) boundaries. The problem with a point source and absorbing boundary conditions (ABC) is solved by the 3D free-space Green's function in the frequency domain, and then transformed to the time domain using the inverse fast Fourier transform (IFFT). For the problem with a plane wave and ABC, the frequency-domain solution is obtained using the volume integral equations and method of moments (VIE-MOM), and is then transformed into the time-domain solution using the IFFT. Comparison …