A FM broadcast signal backscattering method and system for covert communication
A technology of backscattering and broadcasting signals, which is applied in the field of data communication, can solve the problems of poor concealment performance, and achieve the effect of strong anti-intercept ability, high concealment, and good comprehensive imperceptibility
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[0049] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.
[0050] refer to figure 1 , which is a flow chart of an embodiment of the covert communication-oriented FM broadcast signal backscattering method of the present invention.
[0051] First, the transform domain communication theory is used to generate two noise signals orthogonal to the speech signal, and the two hidden information are respectively modulated on the generated two noise signals to generate two "pseudo-noise" embedded with hidden information Signal;
[0052] Secondly, the two-way "pseudo-noise" signal is subjected to stereo modulation to obtain "stereo-pseudo-noise" to match the structure of the FM voice signal, and it is convenient for the receiving end to quickly separate the mixed signal;
[0053] Then p...
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