Physical layer security for cooperative NOMA systems

Jianchao Chen, Liang Yang*, Mohamed Slim Alouini

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

196 Scopus citations


In this correspondence, we investigate the physical layer security for cooperative nonorthogonal multiple access (NOMA) systems, where both amplify-and-forward (AF) and decode-and-forward (DF) protocols are considered. More specifically, some analytical expressions are derived for secrecy outage probability (SOP) and strictly positive secrecy capacity. Results show that AF and DF almost achieve the same secrecy performance. Moreover, asymptotic results demonstrate that the SOP tends to a constant at high signal-to-noise ratio. Finally, our results show that the secrecy performance of considered NOMA systems is independent of the channel conditions between the relay and the poor user.

Original languageEnglish (US)
Pages (from-to)4645-4649
Number of pages5
JournalIEEE Transactions on Vehicular Technology
Issue number5
StatePublished - May 2018

Bibliographical note

Funding Information:
Manuscript received November 1, 2017; revised December 26, 2017; accepted December 29, 2017. Date of publication January 3, 2018; date of current version May 14, 2018. This work was supported in part by the National Natural Science Foundation of China under Grants 61372096 and 61671160, in part by the Department of Education of Guangdong Province (No. 2016KZDXM050), and in part by the open research fund of the National Mobile Communications Research Laboratory, Southeast University (No. 2018D01). The review of this paper was coordinated by Dr. R. D. Souza. (Corresponding author: Liang Yang.) J. Chen and L. Yang are with the Department of Communication Engineering, Guangdong University of Technology, Guangzhou 510006, China (e-mail:;

Publisher Copyright:
© 1967-2012 IEEE.


  • Non-orthogonal multiple access (NOMA)
  • Relaying
  • Secrecy outage probability (SOP)
  • Strictly positive secrecy capacity (SPSC)

ASJC Scopus subject areas

  • Automotive Engineering
  • Aerospace Engineering
  • Electrical and Electronic Engineering
  • Applied Mathematics


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