Outage Performance of Cooperative Underlay CR-NOMA with Imperfect CSI

Sultangali Arzykulov, Theodoros Tsiftsis, Galymzhan Nauryzbayev, Mohamed Abdallah

Research output: Contribution to journalArticlepeer-review

50 Citations (Scopus)


In this letter, a decode-and-forward cooperative underlay cognitive radio (CR) non-orthogonal multiple access (NOMA) network is studied. Exact closed-form expressions for the outage probability (OP) of two NOMA secondary destination users (U1 and U2) are derived in the case of imperfect channel state information. Then, we find optimal power allocation factors for different distances of U1 to satisfy the OP fairness for both users. Moreover, the proposed system model shows the superiority of the CR-NOMA compared to the cooperative OMA. The derived analytical expressions are corroborated through Monte Carlo simulations.

Original languageEnglish
Pages (from-to)176-179
Number of pages4
JournalIEEE Communications Letters
Issue number1
Publication statusPublished - Jan 2019


  • Cognitive radio (CR)
  • decode-and-forward (DF)
  • Downlink
  • Interference
  • NOMA
  • non-orthogonal multiple access (NOMA)
  • outage probability (OP)
  • Relays
  • Signal to noise ratio
  • Silicon carbide
  • Two dimensional displays

ASJC Scopus subject areas

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

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