Covert communication in downlink NOMA systems with random transmit power

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

doi:10.1109/LWC.2020.3011191

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

School of Engineering

Research output: Contribution to journal › Article › peer-review

31 Citations (Scopus)

Abstract

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 language	English
Pages (from-to)	2000-2004
Number of pages	5
Journal	IEEE Wireless Communications Letters
Volume	9
Issue number	11
DOIs	https://doi.org/10.1109/LWC.2020.3011191
Publication status	Published - Nov 2020

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T1 - Covert communication in downlink NOMA systems with random transmit power

AU - Tao, Liwei

AU - Yang, Weiwei

AU - Yan, Shihao

AU - Wu, Dan

AU - Guan, Xinrong

AU - Chen, Dechuan

PY - 2020/11

Y1 - 2020/11

N2 - 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.

AB - 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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Covert communication in downlink NOMA systems with random transmit power

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