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Electrical and Computer Engineering

College of Engineering and Applied Science

Dr. Robert Kubichek's Research

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University of Wyoming Electrical and Computer Engineering Faculty Dr. Robert Kubichek's research projectsMANETs

In this project we are studying mobile ad-hoc networks (MANETs), in which radio nodes have limited mobility. Nodes are presumed to be small, low power devices, which may be located in harsh radio environments including interference, noise, radio shadowing, and fading. Radios are mounted on small mobile platforms that can make small changes in position to move away from fades and interference sources. Algorithms are being studied to allow nodes to collaborate and move to new positions for globally optimal communications.
Antenna arrays are multiple antenna structures that are typically arranged in rectangular or circular grids.  Such arrays are advantageous as they can be electronically steered to increase gain or decrease interference.  In this project we study ways of designing custom array geometries that are not regular grid patterns but are designed to optimized performance criteria such as mean-squared error or signal to noise ratio.  We have found several novel array geometries that improve radio connectivity over standard geometries.
Antenna arrays are used to increase signal strength while nulling out interference sources.  Most newer techniques use “smart antenna” technology, which is effective but requires complex and expensive radio systems. We are studying ways to generate effective antenna gain patterns using low-complexity non-smart radio systems. These systems require only digitally controlled phase shifters for each antenna, compared to newer systems that require a complete transceiver in each antenna chain.
Modern smart antenna arrays provide a way to adaptively change antenna parameters to respond in real time to changes in signals and interference. However, the optimization is typically done in isolation by considering only the signal and noise at individual radio nodes.  We are studying techniques to modify the antenna gain patterns of multiple nodes in a way that optimizes the overall network performance. For example, individual gain patterns could be adjusted to maximize the minimum signal to noise ratio computed across the network.
Dr. Robert Kubichek, faculty member of the University of Wyoming's Department of Electrical and Computer EngineeringIn wireless ad hoc networks, topology is usually determined by nodes “discovering” paths for transmitting data across the network, which be a slow and inefficient process. This project addresses developing a real time map that gives expected radio path loss in a MxN grid called a
Communication Map (CM). The technique uses Kalman filters and spatial Kriging to make optimal estimates of a path loss factor for each grid location. Once known, the CM can be used to predict the quality of radio links between any two points on the map, enabling effective network formation and design.
Projects recently completed in speech processing include: New techniques were developed to estimate the subjective quality of speech communication links. Objective measures of subjective network performance are important for managers and designers of national telecommunication systems. In a related project we looked at estimating intelligibility of speech signals. Such measures are important for police, fire, and military communication applications where intelligibility is more important than quality. Finally, we developed new techniques to detect and diagnose several types of severe dysarthria (a type of speech disorder).
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Electrical and Computer

Engineering, EN 5068

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