A novel covert communication system based on symmetric ${\alpha}$-stable distribution

Abstract

A novel structure for covert communication is proposed in this study. The correlation coefficient of two adjacent symmetric $\alpha$-stable (S$\alpha$S) noise sequences is modulated by the binary message sequence to achieve a covert communication system. In order to reduce the correlation of the modulated signal in the time domain, the modulated signal is scrambled by an interleaver. To verify the covertness of the proposed communication system, an improved circulation spectral density function is employed to detect whether the transmitted signal exists. The simulation results show that the proposed system has strong concealment. Moreover, the bit error rate (BER) performance is simulated and analyzed. The results show that the system has a good performance.