Collaborative Quickest Spectrum Sensing via Random Broadcast in Cognitive Radio Systems

Quickest detection is applied in the spectrum sensing of cognitive radio systems when multiple secondary users collaborate with limited communication time slots. When transmissions are not coordinated to avoid collisions, random broadcast is used to exchange information. A necessary condition for op...

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Bibliographic Details
Published inGLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference pp. 1 - 6
Main Authors Husheng Li, Huaiyu Dai, Chengzhi Li
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.11.2009
Subjects
Cognitive radio
Collaboration
Collaborative work
Computational modeling
Delay
Licenses
Mobile communication
Performance gain
Radio broadcasting
Wireless communication
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Summary:Quickest detection is applied in the spectrum sensing of cognitive radio systems when multiple secondary users collaborate with limited communication time slots. When transmissions are not coordinated to avoid collisions, random broadcast is used to exchange information. A necessary condition for optimal broadcast probability, as a function of the log likelihood ratio of local observation, is obtained using variational analysis. To alleviate the difficulty of computing optimal broadcast probability, a simple threshold broadcast scheme is proposed. Simulation shows that the proposed threshold broadcast scheme can achieve substantial performance gain (less than 60% in detection delay for the same false alarm rate) over random broadcast without regulation, as well as the single-user spectrum sensing.
ISBN:9781424441488
142444148X
ISSN:1930-529X
2576-764X
DOI:10.1109/GLOCOM.2009.5425496