Performance Evaluation of Thermal Noise-Based Covert Communication for Multi-Scenarios

The rapid evolution of information networks presents increasingly severe challenges to wireless communication security. Ensuring its reliable protection has become a core requirement for fields such as the Internet of Things (IoT) and critical infrastructure. Traditional cryptographic techniques rely on computational complexity to establish security barriers, but the emergence of advanced technologies, such as quantum computing, has significantly undermined their long-term security. This paper investigates a previously proposed covert communication method utilizing microwave thermal noise as carrier, conducting link budgets for multi-scenario communication links. Calculation results indicate that at a transmission distance of 500 km, with a transmit power of 15.4 dBm, the power spectral density at the receiver can reach -190.0 dBm/Hz. This method can effectively meet the transmission requirements of various application scenarios, thereby opening an innovative pathway for next-generation high-security wireless systems and establishing a solid theoretical foundation for its application.