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

Active Publication Date: 2019-08-20
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide an FM broadcast signal backscattering method and system for covert communication in view of the technical defect that the backscattering communication technology in the prior art generally adopts the OOK modulation method and the concealment performance is poor

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  • A FM broadcast signal backscattering method and system for covert communication
  • A FM broadcast signal backscattering method and system for covert communication
  • A FM broadcast signal backscattering method and system for covert communication

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Embodiment Construction

[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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Abstract

The invention discloses a FM broadcast signal back scattering method and system oriented to concealment communication. The method comprises the following steps: firstly producing two path noise signals orthogonal with a voice signal by using a transform domain communication theory, and respectively modulating two path concealment information into produced two path noise signals, thereby generatingtwo path pseudo-noise signals embedded with the concealment information; performing stereo modulation on two path pseudo-noise signals to obtain the stereo pseudo-noise so as to match the FM voice signal structure; performing orthogonal carrier FM modulation on the stereo pseudo-noise; and finally performing impedance matching on the modulated signal on a passive system, and the sending out the modulated signal by adopting the back scattering method. The method disclosed by the invention has the advantages of being low in power consumption, low in cost, strong in interference resistance and interception resistance, and high in concealing.

Description

technical field [0001] The present invention relates to the field of data communication, in particular to the aspect of data communication of covert information, and more specifically, to a method and system for backscattering FM broadcast signals oriented to covert communication. Background technique [0002] Covert communication is an important form of communication, and it has great application prospects in the fields of military, finance, aviation, economy, and Internet of Things security. Compared with normal communication, covert communication also has special requirements for anti-jamming and anti-interception. At present, the main technical approach of covert communication is to use direct sequence spread spectrum technology, frequency hopping technology or ultra-wideband technology to generate low-power waveforms to achieve imperceptibility at the signal level or to use encryption and decryption technology to achieve security at the information level. However, due ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04K1/00H04K1/02H04K3/00H04L27/00
Inventor 谢桂辉唐晓庆赵娟王洪鹏黄元境王煜翔黄上都杜晨张改星
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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