The Modulation Technology of Chaotic Multi-Tone and its Application in Covert Communication System

With the development of communication countermeasure technology, the existing communication mode is exposed to intercept or decipher in the covert transmission of information. Therefore, the development of a new concept and principle covert communication technology with low interception probability and anti-non-cooperative demodulation has drawn increasing attention. In this treatise, we propose a chaotic multi-tone modulation and demodulation technology thus present a method to construct the covert communication system. The technology constructs chaotic multi-tone sets to express the baseband information with the multi-value mapping based on the dynamics principle, which can express the same baseband information with different multi-tone groups. Signal modulation is accomplished by combining frequency hopping and baseband information scrambling technology. Multi-value mapping is adopted to complete chaotic multi-tone modulation. Specifically it has strong information concealment and anti-non-cooperative demodulation characteristics. In order to solve the demodulation problem of the cooperative party, we present a demodulation scheme based on chaotic multi-tone and provide a complete chaotic multi-tone communication system construction scheme. Simulation results verify the performance of the proposed method.