Theses and Dissertations at Montana State University (MSU)
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Item Implementation of null steering algorithms in a compact analog array(Montana State University - Bozeman, College of Engineering, 2014) Condori Quispe, Hugo Orlando; Chairperson, Graduate Committee: Richard WolffIn this thesis, the implementation of null steering algorithms in a compact analog array is demonstrated and validated. The performance of the null steering algorithms is validated through extensive simulation and hardware implementation. The results of the techniques of null steering, including controlling the complex weights, usually have to rely on simulations to study system performances, design trade-offs, and system optimization, which by itself can be quite complex and a time-consuming task. Even after extensive simulations, it is not easy to get insights as to what parameters determine system performance in different system parameters, and the interactions on system parameters. Therefore, experimentation and deployment on a real system is required. Few studies have proposed null steering algorithms studies using real implementations. With this motivation, this work presents comprehensive performance comparison of some of the available null steering techniques using an analog array. The contributions of this thesis are: optimize the performance of null steering algorithms taking into account realistic considerations in the simulations and demonstrating the benefits through extensive simulations; and verify the performance of the null steering system through experimental implementation using a simple, compact, lightweight, low cost, high gain, high throughput analog antenna array.Item Development of a cognitive array system(Montana State University - Bozeman, College of Engineering, 2010) Weber, Raymond Joseph; Chairperson, Graduate Committee: Richard Wolff; Yikun Huang (co-chair)This thesis proposes a design for a cognitive array system for next generation wireless communication systems, combining the techniques of cognitive radios and adaptive array systems. This novel array system allows for the possibility of greater spectral usage and reuse, and improved communication ranges. In this thesis, numerous algorithms were studied to map an RF environment in both spatial and spectral domains that would be useful in this system. Towards this goal, direction of arrival estimation, frequency sensing and spectral hole finding algorithms were studied, in addition to a joint frequency and direction of arrival estimation algorithm. Beamforming was also studied as a means of improving signal quality and increasing range. Once the direction to a target was found, localization and tracking were studied to further refine the target's position and change in position over time. After the algorithms were studied in simulation to determine their properties, hardware calibration was performed followed by laboratory tests of the methods with a uniform circular array testbed at Montana State University to verify the expected performances.