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Volume 24
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10.3390/s24030796
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Article

Optimization of Covert Communication in Multi-Sensor Asymmetric Noise Systems

by
Sen Qiao
,
Ruizhi Zhu
,
Xiaopeng Ji
*,
Junjie Zhao
and
Huihui Ding
School of Electronics and Information Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China
*
Author to whom correspondence should be addressed.
Sensors 2024, 24(3), 796; https://doi.org/10.3390/s24030796
Submission received: 11 December 2023 / Revised: 16 January 2024 / Accepted: 23 January 2024 / Published: 25 January 2024
(This article belongs to the Section Communications)
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Abstract

This work investigates wireless covert communication in a multi-sensor asymmetric noise scenario. We adopt KL (Kullback–Leibler) divergence as the covertness constraint metric and mutual information as the transmission rate metric. To accurately approximate KL divergence and mutual information in covert communication, we employ the Taylor series expansion technique. Analytical expressions for KL divergence and mutual information in covert communication are derived, and we optimize the amplitude gain and phase angles based on these analytical expressions. Our findings underscore the importance of phase angle selection in covert communication within asymmetric noise systems. We propose an effective method for optimizing the transmission amplitude gain and phase angles in scenarios with asymmetric noise. Numerical results validate the effectiveness and superiority of our proposed method.
Keywords: covert communication; asymmetric noise; BPSK; Taylor series expansion covert communication; asymmetric noise; BPSK; Taylor series expansion

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MDPI and ACS Style

Qiao, S.; Zhu, R.; Ji, X.; Zhao, J.; Ding, H. Optimization of Covert Communication in Multi-Sensor Asymmetric Noise Systems. Sensors 2024, 24, 796. https://doi.org/10.3390/s24030796

AMA Style

Qiao S, Zhu R, Ji X, Zhao J, Ding H. Optimization of Covert Communication in Multi-Sensor Asymmetric Noise Systems. Sensors. 2024; 24(3):796. https://doi.org/10.3390/s24030796

Chicago/Turabian Style

Qiao, Sen, Ruizhi Zhu, Xiaopeng Ji, Junjie Zhao, and Huihui Ding. 2024. "Optimization of Covert Communication in Multi-Sensor Asymmetric Noise Systems" Sensors 24, no. 3: 796. https://doi.org/10.3390/s24030796

APA Style

Qiao, S., Zhu, R., Ji, X., Zhao, J., & Ding, H. (2024). Optimization of Covert Communication in Multi-Sensor Asymmetric Noise Systems. Sensors, 24(3), 796. https://doi.org/10.3390/s24030796

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