Fast detection of spectral white spaces for cognitive radio networks

  • Authors:

  • George Thomas

  • Affiliations:

  • The University of Louisiana at Lafayette, Lafayette, LA

  • Venue:
  • MILCOM'09 Proceedings of the 28th IEEE conference on Military communications
  • Year:
  • 2009

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Abstract

In military tactical communications, cognitive radio (CR) has been proposed as a potential technology. A CR network can support vital communications among troops and vehicles in an alien territory with unfamiliar or unknown radio environment that may be changing dynamically in time. We propose a new approach for dynamic detection of "white spaces" i.e. available radio channels, based on a novel concept of spectral sampling and variance estimation. We use FFT to obtain a set of samples of the short-term signal spectrum in a given band of frequencies. By analyzing spectral and statistical features of this set of samples, we are able to make fast and accurate determination ofsignal presence in a band.