Waveform diversified secure transmission method and system based on extended weighted score Fourier transform

A fractional Fourier, safe transmission technology, applied in the field of waveform diversified safe transmission methods and systems, can solve the problems of low security, poor anti-interception performance, poor waveform diversity, etc., to achieve enhanced security performance, good compatibility, The effect of safeguarding confidentiality

Active Publication Date: 2021-08-24
HARBIN INST OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of poor waveform diversity, poor anti-interception performance and low transmission security due to the limitation of parameter dimensions in the existing mixed carrier security communication method, and proposes a method based on extended weighting Fractional Fourier Transform Waveform Diversified Secure Transmission Method and System

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  • Waveform diversified secure transmission method and system based on extended weighted score Fourier transform
  • Waveform diversified secure transmission method and system based on extended weighted score Fourier transform
  • Waveform diversified secure transmission method and system based on extended weighted score Fourier transform

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specific Embodiment approach 1

[0053] Specific implementation mode 1. Combination figure 1 This embodiment will be described. A waveform-diversified secure transmission method based on extended weighted fractional Fourier transform described in this embodiment, the method specifically includes the following steps:

[0054] Step 1. Perform baseband constellation mapping on the 0 and 1 bit data generated by the information source, and obtain the modulation result after constellation mapping;

[0055] Step 2. Group the modulation results obtained in step 1: starting from the first bit of the modulation result, divide the modulation result into M data blocks of equal length, and the length L of each data block is 2 N , N is a positive integer, each data block corresponds to a frame of data, and the i'th frame data is expressed as X i′ , i'=1,2,3,...,M, M is the total number of data blocks;

[0056] x i′ =[x 0 x 1 ... x L-1 ],x 0 , x 1 ,...,x L-1 Respectively for the i′th frame data X i′ 1st, 2nd, ....

specific Embodiment approach 2

[0083] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the permutation matrix The specific expression of is:

[0084]

[0085] Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0086] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that in the step five, the analog modulation signal X obtained in the step four T0 Perform up-conversion processing to obtain the signal after the up-conversion processing, the specific form of the signal after the up-conversion processing is:

[0087]

[0088] Among them, X T1 is the signal after up-conversion processing, e is the base of natural logarithm, f c Is the center frequency of carrier modulation, t is the timing mark, and Re[·] means to take the real part.

[0089] Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

[0090] In this embodiment, for the signal X T0 Performing up-conversion processing means: converting the analog modulation signal X T0 Modulate to the corresponding carrier frequency to get the data X on the corresponding carrier frequency T1 .

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Abstract

The invention discloses a waveform diversified secure transmission method and system based on extended weighted score Fourier transform, and belongs to the technical field of wireless communication. According to the invention, the problem of poor anti-interception performance caused by poor waveform diversity due to limitation of parameter dimensions in the existing hybrid carrier safety communication method is solved. The waveform diversified secure transmission method is designed for an existing security system, and an extended hybrid carrier signal with high parameter dimension and design flexibility can be obtained by performing extended weighted fractional Fourier transform on the signal. Due to the expansion of the transformation form, the signal waveform has strong diversity, so that the calculation complexity of realizing correct inverse transformation through cracking is greatly improved, the probability that an eavesdropper intercepts a signal is effectively reduced, the physical layer security performance of the system is enhanced, and the communication confidentiality is guaranteed. Meanwhile, the method has good compatibility with an existing security method. The method can be applied to the technical field of wireless communication.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a method and system for safe transmission of waveform diversification based on extended weighted fractional Fourier transform. Background technique [0002] In the field of wireless communication, with the rapid growth of the demand for communication confidentiality, the secure transmission of information has become the focus of attention. As a kind of supplementary security means to the upper layer encryption system with cryptography as the core, physical layer security technology has shown important value and has been widely studied. In recent years, the weighted fractional Fourier transform, a transform domain signal processing method with good realizability, has been gradually introduced into the field of physical layer security and has achieved good research results. However, the change of the signal characteristics of the existing mixed carrier s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W12/03H04W12/122
CPCH04W12/03H04W12/122Y02D30/70
Inventor 沙学军宋鸽房宵杰张桐
Owner HARBIN INST OF TECH
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