Security Enhancement Using a Novel Two-Slot Cooperative NOMA Scheme

Bingcai Chen, Yu Chen, Yang Cao, Yunfei Chen, Nan Zhao, Zhiguo Ding, Xianbin Wang

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


In this article, we propose a novel cooperative non-orthogonal multiple access (NOMA) scheme to guarantee the secure transmission of a specific user via two time slots. During the first time slot, the base station (BS) transmits the superimposed signal to the first user and the relay via NOMA. Meanwhile, the signal for the first user is also decoded at the second user from the superimposed signal due to its high transmit power. In the second time slot, the relay forwards the signal to the second user while the BS retransmits the signal for the first user as interference to disrupt the eavesdropping. Due to the fact that the second user has obtained the signal for the first user in the first slot, the interference can be eliminated at the second user. To measure the performance of the proposed cooperative NOMA scheme, the outage probability for the first user and the secrecy outage probability for the second user are analyzed. Simulation results are presented to show the effectiveness of the proposed scheme.

Original languageBritish English
Article number8961964
Pages (from-to)3470-3475
Number of pages6
JournalIEEE Transactions on Vehicular Technology
Issue number3
StatePublished - Mar 2020


  • Artificial noise
  • non-orthogonal multiple access
  • physical layer security
  • relay
  • secrecy outage probability


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