On Secure CDRT with NOMA and Physical-Layer Network Coding

Hongjiang Lei, Xusheng She, Kihong Park, Imran Shafique Ansari, Zheng Shi, Jing Jiang, Mohamed-Slim Alouini

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


This paper proposes a new scheme to enhance the secrecy performance of non-orthogonal multiple access (NOMA)-based coordinated direct relay transmission (CDRT) systems with an untrusted relay. The physical-layer network coding (PNC) and the NOMA schemes are combined to improve spectrum efficiency. Furthermore, inter-user interference and friendly jamming signals are utilized to suppress the eavesdropping ability of the untrusted relay without compromising the acceptance quality of legitimate users. Specifically, the far user in the first slot and the near user in the second slot act as jammers that generate jamming signals to ensure secure transmissions of confidential messages. We investigate the secrecy performance of the NOMA-based CDRT systems with the PNC scheme and derive the closed-form expression for the ergodic secrecy sum rate. The asymptotic analysis at a high signal-to-noise ratio is performed to obtain more insights. Finally, simulation results are presented to demonstrate the proposed scheme’s effectiveness and the theoretical analysis’s correctness.
Original languageEnglish (US)
Pages (from-to)1-1
Number of pages1
JournalIEEE Transactions on Communications
StatePublished - Nov 30 2022

Bibliographical note

KAUST Repository Item: Exported on 2022-12-06
Acknowledgements: This work was supported by the National Natural Science Foundation of China under Grant 61971080, 62171200, and the Open Fund of the Shaanxi Key Laboratory of Information Communication Network and Security under Grant ICNS201807.

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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