Covert communication in downlink NOMA systems with random transmit power

Liwei Tao, Weiwei Yang*, Shihao Yan, Dan Wu, Xinrong Guan, Dechuan Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)


This letter considers covert communication in downlink NOMA systems, where a public action (communication from Alice to the NOMA-weak user U1) is used to provide a cover for a secret action (communication from Alice to the NOMA-strong user U2). To aid system design, we first derive the detection error probability (DEP) at Willie and the connect outage probabilities (COPs) at U1 and U2. Then, considering the covertness and outage constraints, the optimization of power allocation factor ratio between U1 and U2 is tackled in order to maximize the effective covert rate. The results demonstrate that the minimum DEP is the power allocation factor for U1. In addition, for a given covert constraint, relaxing the outage constraint will effectively increase the maximum effective covert rate within a certain range of the maximum transmit power of U1.

Original languageEnglish
Pages (from-to)2000-2004
Number of pages5
JournalIEEE Wireless Communications Letters
Issue number11
Publication statusPublished - Nov 2020


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