Impact of the CSI on the performance of cognitive relay networks with partial relay selection

Wael Jaafar, Tomoaki Ohtsuki, Wessam Ajib, David Haccoun

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


In a cognitive relay network, a secondary cooperative transmission, sharing the same spectrum band with N primary transmissions, is considered. Assuming imperfect channel state knowledge of the interference channels (from secondary transmitters to primary receivers) at the secondary nodes, we investigate the problem of secondary achievable rate maximization under a constraint on the interference caused at the primary receivers. Different scenarios are defined based on the accuracy of estimating the interference channels at the primary receivers and the number of feedback quantization bits. For each scenario, we derive expressions for both the secondary achievable rate and the primary interference probability. Then, we investigate the associated power allocation problem and provide a sub-optimal solution. Finally, analytical and simulation results illustrate the efficiency of the provided solution in terms of secondary achievable rate and primary interference probability.

Original languageEnglish
Article number7038179
Pages (from-to)673-684
Number of pages12
JournalIEEE Transactions on Vehicular Technology
Issue number2
Publication statusPublished - 2016 Feb


  • Amplify-and-forward (AF)
  • Cognitive radio (CR)
  • Partial relay selection
  • Quantization

ASJC Scopus subject areas

  • Automotive Engineering
  • Aerospace Engineering
  • Electrical and Electronic Engineering
  • Applied Mathematics


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