On energy detection for cooperative spectrum sensing

Fangrong Peng, Hao Chen, Biao Chen

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations

Abstract

Energy detection has been used almost exclusively in spectrum sensing. This paper studies the potential optimality (or sub-optimality) of the energy detector in spectrum sensing for two systems: one employing a single node and the other using multiple nodes, i.e., cooperative spectrum sensing. We consider both Gaussian channels as well as fading channels with different signaling from the primary user. For a single node case, we show that the energy detector is provably optimal for most cases and for the case when it is not theoretically optimal, its performance is nearly indistinguishable from the true optimal detector. For cooperative spectrum sensing, however, the problem becomes extremely complicated. The presence of the common signal from the primary user introduces dependence among the observations at different nodes; it is well known that for decentralized detection with dependent observations, designing optimal local decision rules typically is an NP problem. Using a recently proposed framework for distributed detection with dependent observations, we establish the optimality of energy detector for several cooperative spectrum sensing systems and point out difficulties for the remaining cases.

Original languageEnglish (US)
Title of host publication2012 46th Annual Conference on Information Sciences and Systems, CISS 2012
DOIs
StatePublished - Nov 12 2012
Event2012 46th Annual Conference on Information Sciences and Systems, CISS 2012 - Princeton, NJ, United States
Duration: Mar 21 2012Mar 23 2012

Publication series

Name2012 46th Annual Conference on Information Sciences and Systems, CISS 2012

Other

Other2012 46th Annual Conference on Information Sciences and Systems, CISS 2012
CountryUnited States
CityPrinceton, NJ
Period3/21/123/23/12

ASJC Scopus subject areas

  • Information Systems

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  • Cite this

    Peng, F., Chen, H., & Chen, B. (2012). On energy detection for cooperative spectrum sensing. In 2012 46th Annual Conference on Information Sciences and Systems, CISS 2012 [6310855] (2012 46th Annual Conference on Information Sciences and Systems, CISS 2012). https://doi.org/10.1109/CISS.2012.6310855