Dynamic Spectrum Control Transmission Scheme Based on Chaotic Mapping Switching for Satellite Covert Communication

Satellite communication has shown great potential for providing ubiquitous connectivity and broadband mobile communications, owing to its advantages of wide coverage, large system capacity, and high transmission rate. However, the increasing complexity of the electromagnetic scenarios poses an unprecedented threat to the security and reliability of satellite covert communication. In this paper, a dynamic spectrum control (DSC) transmission scheme for enhancing the covertness of satellite communications is proposed. The scheme generates a sequence family based on chaotic mapping, controls data decisions and switching processing. With the assistance of this sequence family, the authorized satellite user can unpredictably and dynamically occupy frequency slots for transmitting information. Then, the closed-form expressions of Bit Error Rate (BER) and detection probability is derived. Numerical results demonstrate that the proposed scheme outperforms the benchmark scheme in terms of the overall system performance. Besides, the influences of key parameters in the proposed scheme on the covertness of the system are further analyzed.