Title page for ETD etd-10042012-132540


Type of Document Master's Thesis
Author DeJarnette, Hunter Archer
Author's Email Address hdejarne@vt.edu
URN etd-10042012-132540
Title Measuring Noise in the VHF Band and Its Effect on Low SNR Signal Detection
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Buehrer, Richard Michael Committee Chair
da Silva, Claudio R. C. M. Committee Member
Ellingson, Steven W. Committee Member
Keywords
  • energy detector
  • impulsive noise
  • VHF
Date of Defense 2012-09-26
Availability unrestricted
Abstract
With the increasing demand for access to the crowded radio frequency spectrum, cognitive radios have been suggested as one solution. Cognitive radios would be frequency agile and able to sense their radio environment and opportunistically use empty spectrum. Spectrum sensing, monitoring a given band of spectrum to see if it is occupied, is an essential part of a cognitive radio. The preferred method of spectrum sensing is the energy detector, which does not require any a priori information about the signal to be detected and is computationally simple to implement. Man-made noise, impulsive in nature, has also become more prevalent with the widespread use of electronic devices. In this thesis, we took measurements of man-made impulsive noise in the broadcast digital television bands to measure its presence, power, and spatial correlation. The effects of impulsive noise on the detection performance of an energy detector were analyzed. Lastly, a wideband RF receiver was designed, built, and tested on the Virginia Tech campus, which would be well suited both to spectrum sensing and taking measurements of impulsive noise.
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