Channel Availability Assessment for Cognitive Radios

  • António Furtado
  • Miguel Luís
  • Rodolfo Oliveira
  • Rui Dinis
  • Luis Bernardo
Conference paper
Part of the IFIP Advances in Information and Communication Technology book series (IFIPAICT, volume 394)


This work addresses two problems related with the assessment of channel availability for cognitive radio systems. We start to characterize the performance of an energy detector for the case when PUs can change their state during the sensing period. The theoretical performance is validated through simulations and compared with a theoretical model where the PUs’ state remains constant during the sensing period. The second point addressed in this work is the characterization of the channel availability, which is based on the output of the energy detector weighted by the probabilities of detection or false alarm computed in real-time. Several scenarios were evaluated and for each scenario the channel availability was correctly assessed by the SUs.


Cognitive radio networks Energy Sensing System Analysis 


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Copyright information

© IFIP International Federation for Information Processing 2013

Authors and Affiliations

  • António Furtado
    • 2
    • 3
  • Miguel Luís
    • 1
    • 2
  • Rodolfo Oliveira
    • 1
  • Rui Dinis
    • 1
    • 2
  • Luis Bernardo
    • 1
  1. 1.CTS, Uninova, Dep.° de Eng.a Electrotécnica, Faculdade de Ciências e Tecnologia, FCTUniversidade Nova de LisboaCaparicaPortugal
  2. 2.IT, Instituto de TelecomunicaçõesPortugal
  3. 3.ISR, Instituto de Sistemas e RobóticaPortugal

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