On the Limits of Covert Backscatter Communication Over Undecodable Ambient Signals

Chen, Weiyu; Ding, Haiyang; Wang, Shilian; Gong, Fengkui; Xia, Guang-Qiong

doi:10.1109/tifs.2023.3293420

Cited by 4 publications

(1 citation statement)

References 38 publications

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“…Then, the phase angle gain over complex Gaussian channels was discovered in [11], and we can obtain a phase gain as √ 2 with a simple operation. Moreover, the theoretical boundary of covert communication in backscatter systems has been further explored in [38], and additional covert gain can be obtained from signals reflected without decoding.…”

Section: Related Workmentioning

confidence: 99%

Optimization of Covert Communication in Multi-Sensor Asymmetric Noise Systems

Qiao,

Zhu,

et al. 2024

Sensors

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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.

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Section: Related Workmentioning

confidence: 99%