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covert communication based on transmission antenna selection in the downlink communication link

The Journal of China Universities of Posts and Telecommunications 2021年第3期28卷 20-27页

作者： Guo Hui Qiao Ting School of Physics and Electronic Information Engineering Henan Polytechnic UniversityJiaozuo 454003China

A downlink covert communication model that consists of a base station and two legitimate users was considered. In addition to the general signals shared by the two users, the base station will send the covert signals only to one user in a certain time without wanting the other to detect this covert communication behavior. In order to achieve covert communication, two information transmission schemes are designed based on transmission antenna selection(TAS) with the help of artificial noise(AN) transmitted by the user receiving the covert signals, denoted as TAS-Ⅰ and TAS-Ⅱ respectively. Considering the best detection performance of the user only receiving the general signals, under the two schemes, the detection error probabilities and their average values, the connection probabilities, the system covert throughputs are separately calculated. In addition, on the premise of meeting the system's covert conditions, an optimization scheme is proposed to maximize the covert system throughput. Finally, the simulation results show that the proposed system can realize covert communication successfully, and the system covert performance under TAS-Ⅰ is better than that under TAS-Ⅱ.

关键词： covert communication transmission antenna selection(TAS) detection error probability covert throughput

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