On the Spectral Efficiency and Security Enhancements of NOMA Assisted Multicast-Unicast Streaming

Zhiguo Ding, Zhongyuan Zhao, Mugen Peng, H. Vincent Poor

Research output: Contribution to journalArticlepeer-review

191 Scopus citations


This paper considers the application of non-orthogonal multiple access (NOMA) to a multi-user network with mixed multicasting and unicasting traffic. The proposed design of beamforming and power allocation ensures that the unicasting performance is improved while maintaining the reception reliability of multicasting. Both analytical and simulation results are provided to demonstrate that the use of the NOMA assisted multicast-unicast scheme yields a significant improvement in spectral efficiency compared with orthogonal multiple access (OMA) schemes which realize multicasting and unicasting services separately. Since unicast messages are broadcast to all the users, how the use of NOMA can prevent those multicast receivers intercepting the unicasting messages is also investigated, where it is shown that the secrecy unicasting rate achieved by NOMA is always larger than or equal to that of OMA. Simulation results are provided to verify the developed analytical results and demonstrate the superior performance of the proposed NOMA scheme.

Original languageEnglish (US)
Article number7906532
Pages (from-to)3151-3163
Number of pages13
JournalIEEE Transactions on Communications
Issue number7
StatePublished - Jul 2017

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering


  • Non-orthogonal multiple access (NOMA)
  • multicasting and unicasting
  • physical layer security


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