Journal
IEEE WIRELESS COMMUNICATIONS LETTERS
Volume 9, Issue 11, Pages 2000-2004Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LWC.2020.3011191
Keywords
NOMA; Resource management; Error probability; Receivers; Gold; Signal to noise ratio; Downlink; Covert communication; NOMA; random transmit power; power allocation
Categories
Funding
- National Natural Science Foundation of China [61471393, 61771487, 61671474]
- Jiangsu Provincial Natural Science Fund for Outstanding Young Scholars [BK20180028]
- Jiangsu Provincial Natural Science Fund for Excellent Young Scholars [BK20170089]
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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.
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