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A bpsk signal encryption method based on chaotic system

A chaotic system and chaotic signal technology, which can be applied to secure communications, transmission systems, digital transmission systems through chaotic signals, etc., and can solve problems such as noise sensitivity, reduced practicability and feasibility, and dependence.

Inactive Publication Date: 2021-05-18
CHANGAN UNIV
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  • Description
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Problems solved by technology

At present, most of the chaotic secure communication is based on the chaotic synchronization. This kind of method adopts the non-coherent receiving method to effectively restore the transmission information hidden in the chaotic signal at the receiving end, but this method depends on the chaotic synchronization. At present, Chaotic synchronization technology has not yet reached a fully mature stage, and this method is very sensitive to noise, so its practicality and feasibility in practical problems are greatly reduced

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  • A bpsk signal encryption method based on chaotic system
  • A bpsk signal encryption method based on chaotic system
  • A bpsk signal encryption method based on chaotic system

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Embodiment Construction

[0079] Below in conjunction with accompanying drawing and embodiment the present invention is described in detail:

[0080] The mathematical expression of the chaotic system I adopted by the present invention at the sending end is:

[0081]

[0082] where x is a continuous state variable, system parameters 0<β≤ln(2), ω=2π s(t) is a bipolar signal, and satisfies:

[0083]

[0084] And the basis function of chaotic system I is:

[0085]

[0086] Take x(1)=-0.9123 as the initial value of the chaotic system I, and generate the chaotic signal x(t) at the sending end as figure 1 shown;

[0087] The binary signal s(m) at the sending end is as figure 2 Converted to BPSK signal y(t) as shown image 3 The conversion methods shown are shown in formulas (20) and (21):

[0088]

[0089]

[0090] in, is the phase corresponding to the nth binary signal;

[0091] The chaotic signal and the BPSK signal are superimposed to generate the transmitted signal such as Figure...

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Abstract

The invention discloses a BPSK signal encryption method based on a chaotic system, comprising the following steps: 1) converting a binary signal to be sent into a BPSK signal; 2) randomly generating an initial signal and inputting it into the chaotic system I to generate chaos at the sending end signal; 3) use the chaotic signal in step 2) to mask and encrypt the BPSK signal in step 1); 4) receive the signal, integrate and then binarize in a neighborhood at the median of the whole point to obtain bipolar 5) Input the integrated bipolar signal into the chaotic system II to generate the chaotic signal at the receiving end; 6) Convert the chaotic signal at the receiving end to the chaotic signal at the sending end according to the two basis functions of the chaotic system; 7) Use the receiving end The BPSK signal is obtained by subtracting the converted chaotic signal at the receiving end from the signal at the end; 8) The binary signal at the sending end is obtained by passing the BPSK signal through the BPSK demodulation system. The invention uses the chaotic system to generate the required chaotic signal to perform mask encryption on the BPSK signal.

Description

technical field [0001] The invention belongs to the field of secure communication, and in particular relates to a BPSK signal encryption method based on a chaotic system. Background technique [0002] The initial value and parameter sensitivity of chaotic signals, noise-like properties, broadband and synchronizable characteristics make chaos more and more widely used in secure communication. At present, most of the chaotic secure communication is based on the chaotic synchronization. This kind of method adopts the non-coherent receiving method to effectively restore the transmission information hidden in the chaotic signal at the receiving end, but this method depends on the chaotic synchronization. At present, Chaotic synchronization technology has not yet reached a fully mature stage, and this method is very sensitive to noise, so its practicality and feasibility in practical problems are greatly reduced. Therefore, it is very urgent to propose a feasible and practical hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/00H04L27/00H04L27/233
CPCH04L9/001H04L27/001H04L27/233
Inventor 刘立东李毅张照仑郭晨
Owner CHANGAN UNIV
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