Artificial noise-assisted frequency array for covert communication

Covert communication frequently employs the use of environmental background signals or the fabrication of analogous signals to deceive Willie, that is, to utilize the environment as a shield and enhance the concealment of transmission signals. Direct-to-direct communication plays a pivotal role in 5G systems, offering proximate data services and facilitating the transfer of sensitive data. In compact communication networks, frequency division multiplexing can be utilized at the base station (BS) to transmit artificial noise. The objective is to deceive those attempting to detect concealed signals. Furthermore, the potential of using a full-duplex base station to reduce the complexity of communication between different nodes is being considered. Full-duplex communication is a crucial technology for 5G networks and has been the subject of extensive research in recent years. The development of full-duplex base station models for small communication networks has also become a prominent area of study. In light of these developments, this paper proposes the use of a full-duplex base station with multiple antennas to facilitate D2D concealed communication. This paper presents a methodology for evaluating the concealment performance of a wireless communication system. The proposed approach employs the average minimum error probability (AMEP) as a performance metric. It also derives the expressions for the minimum average detection error probability and the maximum effective concealment communication rate. The results demonstrate that by optimizing the system parameters, such as the number of antennas and the power of the artificial noise source, the concealment communication rate can be enhanced.