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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

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 · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

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 19, 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. 19 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 19]. 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

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