Minimization of age of information for satellite-terrestrial covert communication with a full-duplex receiver
Online published: 2024-11-16
Copyright
In the context of the continuous development of modern communication technologies, the satellite communication plays a crucial role in global information transmission. However, the communication security and the timeliness of information are always key issues that urgently need to be addressed. The information freshness of covert communication in a satellite-terrestrial system consisting of a satellite transmitter Alice, a terrestrial full-duplex receiver Bob, and a terrestrial warden Willie, was taken as the object of the study. Particularly, Alice tried to transmit the covert information to Bob under the detection of Willie, while Bob emitted jamming signals to confuse Willie simultaneously. Therefore, a theoretical model was provided for the average age of information (AoI) of Bob and the covert constraint of Willie. This model considered the impact of various interferences and noises during the communication process, providing a solid theoretical basis for analyzing system performance. Based on the theoretical model, a optimal transmit power of Alice was drived to minimize the average AoI with the constraint of covertness requirement. By optimizing the transmission power, Alice is capable of ensuring the maximum the freshness of information while minimizing the delay in information transmission under the precondition of covert communication. Subsequently, numerical simulations were carried out to verify the accuracy of the theoretical model, and the impacts of transmission power and interference power on the concealment and average AoI were analyzed. Finally, the numerical results showed that the balance between concealment and AoI could be effectively achieved by reasonably adjusting the transmission and jamming power.
CAO Yizhi , GUO Zewei , MIAO Qifeng , YANG Weidong . Minimization of age of information for satellite-terrestrial covert communication with a full-duplex receiver[J]. Journal of Cybersecurity, 2024 , 2(4) : 29 -35 . DOI: 10.20172/j.issn.2097-3136.240403
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