We investigate the effect of the outdated channel state information (CSI) on the secondary relay-aided network's performance. We carry out the analysis of the outage probability as well as the diversity order of the secondary network (SN) considering three key constraints: 1) maximum transmit power at the secondary transmitter, 2) peak interference power at the primary receiver, and 3) outdated CSI at the secondary-to-primary and secondary-to-secondary links. The performance results show that the relay cluster position, the imperfect CSI of the interference links and of the second hop are the key optimization factors. We show that the correlation coefficient of the second hop link is the key optimization parameter of the diversity order.

Original languageEnglish
Article number6656073
Pages (from-to)2272-2275
Number of pages4
JournalIEEE Communications Letters
Issue number12
Publication statusPublished - Dec 2013



  • Cognitive relay networks
  • Outage analysis
  • Outdated CSI

ASJC Scopus subject areas

  • Modelling and Simulation
  • Computer Science Applications
  • Electrical and Electronic Engineering

Cite this