On the Performance of Wireless Powered Cognitive Relay Network with Interference Alignment

Sultangali Arzykulov, Galymzhan Nauryzbayev, Theodoros Tsiftsis, Mohamed Abdallah

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


In this paper, a two-hop decode-and-forward wireless powered relaying cognitive radio network with interference alignment over Rayleigh fading channels is investigated. The energy-constrained secondary relay node harvests energy from both the information and interference signals. Then, the harvested energy is used by the relay to forward the information signal from the source to the destination node. By applying beamforming matrices to primary and secondary networks, the performance metrics, such as outage probability, capacity, and bit error rate are studied under perfect and imperfect channel state information scenarios for both power-splitting relaying (PSR) and time-switching relaying (TSR) protocols. In addition, the optimal network performance is achieved by calculating the optimal energy harvesting time-switching and power-splitting coefficients. Finally, closed-form expressions for the outage probability of primary and secondary users are derived. Monte Carlo simulation results corroborate the analytical ones and show that the PSR technique outperforms TSR in the considered system model.

Original languageEnglish
Article number8354826
Pages (from-to)3825-3836
Number of pages12
JournalIEEE Transactions on Communications
Issue number9
Publication statusPublished - Sep 2018


  • Cognitive radio (CR)
  • decode-and-forward (DF) relaying
  • energy harvesting (EH)
  • interference alignment (IA)
  • outage probability (OP)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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