Covert Wireless Communication Scheme Based on Random DynamicDiffusion of Energy over Multipath Channel br

Focusing on the unknown and illegal detecting threat of wireless communication, a random pathhopping scheme is proposed in this paper, which achieves random dynamic diffusion of signal energy onmultipath. Firstly, a covert transmission strategy is constructed based on the multipath channel as well as thedetecting model. Secondly, the closed expressions of the enemy's average received SNR (Signal to Noise Ratio)are derived respectively under the proposed scheme, the random path hopping scheme and the classic maximumratio transmission scheme, and the minimal average covert probability is calculated by the curve fitting methodfor the qualitative and quantitative evaluation of covert performance. Finally, the closed expression of the legalreceiver's SNR is also derived for evaluating rate performance. The simulations reveal that the proposed schemenot only has the advantage of covert performance in the general case of enemy unknown, but also can solve thedisabled problem of covert communication most effectively in the extreme case of enemy approaching the legalreceiver