Beamforming Design and Performance Analysis of Full-Duplex Cooperative NOMA Systems

Zahra Mobini, Mohammadali Mohammadi, Batu K. Chalise, Himal A. Suraweera, Zhiguo Ding

Research output: Contribution to journalArticlepeer-review

35 Scopus citations


We consider downlink non-orthogonal multiple access transmission where an access point communicates with a set of near and far users via a full-duplex multiple antenna relay. To deal with the inter-user interference at the near user and self-interference at the relay, we propose the optimum and suboptimal beamforming schemes. In addition, we consider two different user selection criteria, namely: 1) random near user and random far user (RNRF) selection and 2) nearest near user and nearest far user (NNNF) selection, and we derive the outage probabilities of the near and far users. Our findings reveal that as compared to half-duplex operation, full-duplex relaying can reduce the outage probability of the near users up to 63% in the case of NNNF user selection. With suboptimal beamforming schemes, the NNNF user selection shows a superior performance as compared to the RNRF user selection for all choices of transmit power, while with the optimum beamforming, the performance of the RNRF user selection converges to the NNNF user selection at high transmit power. The simulation results are provided to confirm the accuracy of the developed analytical results and facilitate a better performance comparison.

Original languageBritish English
Article number8705669
Pages (from-to)3295-3311
Number of pages17
JournalIEEE Transactions on Wireless Communications
Issue number6
StatePublished - Jun 2019


  • beamforming
  • Full-duplex
  • non-orthogonal multiple access (NOMA)
  • stochastic geometry


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