Dual relay selection for cooperative NOMA with distributed space time coding

Jing Zhao, Zhiguo Ding, Pingzhi Fan, Zheng Yang, George K. Karagiannidis

Research output: Contribution to journalArticlepeer-review

39 Scopus citations


We consider a two-user multi-relay cooperative non-orthogonal multiple access (NOMA) network with distributed space-time coding. Two dual-relay selection strategies are proposed for cooperative NOMA, namely, two-stage dual relay selection with fixed power allocation (DRS-FPA) and two-stage dual relay selection with dynamic power allocation (DRS-DPA). Furthermore, lower and upper bounds on the outage probability for the DRS-FPA scheme and the exact outage probability for the DRS-DPA scheme are obtained in closed-form, respectively. Numerical results show that the proposed two-stage DRS schemes not only yield better outage performance than the existing single relay selection schemes without sacrificing spectral efficiency, but can also achieve full diversity gain.

Original languageBritish English
Pages (from-to)20440-20450
Number of pages11
JournalIEEE Access
StatePublished - 28 Mar 2018


  • Cooperative non-orthogonal multiple access
  • Outage performance
  • Relay selection
  • Space time coding


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