Skip to content


  • Research Article
  • Open Access

Restless Watchdog: Selective Quickest Spectrum Sensing in Multichannel Cognitive Radio Systems

EURASIP Journal on Advances in Signal Processing20092009:417457

  • Received: 26 January 2009
  • Accepted: 8 July 2009
  • Published:


Selective quickest spectrum sensing, which monitors the spectrum activity in multiple channels, is studied for multichannel cognitive radio systems with nonnegligible channel switching time (blind period). The spectrum sensor needs to detect the emergence of primary users as quickly as possible. Due to hardware limitation, it is assumed that only a subset of frequency channels can be monitored simultaneously. The problem of controlling the monitoring procedure is studied in the frameworks of dynamic programming (DP). System states and cost functions are defined. Cost-to-go functions for DP are derived, simplified, and approximated, based on which control policies are derived. Numerical results are provided to demonstrate the proposed algorithms.


  • Information Technology
  • Cost Function
  • Dynamic Programming
  • System State
  • Quantum Information

Publisher note

To access the full article, please see PDF.

Authors’ Affiliations

Department of Electrical Engineering and Computer Science, The University of Tennessee, Knoxville, TN 37996, USA


© Husheng Li. 2009

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.