Cooperative spectrum sensing with transmit and relay diversity in cognitive radio networks - [transaction letters]

Wei Zhang, Khaled Letaief

Research output: Contribution to journalArticle

281 Citations (Scopus)


In the letter the problem of cooperative spectrum sensing is investigated in cognitive radio (CR) networks over Rayleigh fading channels. By taking into account the error effect on the decision reporting, a general performance analysis of cooperative spectrum sensing is given. The analytical detection results show that the performance of cooperative spectrum sensing is limited by the probability of reporting errors. To deal with this limitation, we propose a transmit diversity based cooperative spectrum sensing method. By regarding multiple CRs as a virtual antenna array, space-time coding and spacefrequency coding are applied into CR networks over flat-fading and frequency-selective fading channels, respectively. Moreover, we propose a relay diversity based cooperative spectrum sensing approach to increase the diversity of detection when some CRs are in heavy shadowing. It is then shown that, when combined with algebraic coding, relay diversity can further improve the cooperative spectrum sensing performance.

Original languageEnglish
Article number4712688
Pages (from-to)4761-4766
Number of pages6
JournalIEEE Transactions on Wireless Communications
Issue number12
Publication statusPublished - Dec 2008
Externally publishedYes



  • Cognitive radio
  • Diversity technique
  • Relay channels
  • Space-frequency coding
  • Space-time coding

ASJC Scopus subject areas

  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this