A Detection-Resistant Transmission Method Based on Extended Weighted Fractional Fourier Transform

A technology of fractional Fourier transform and transmission method, which is applied in the field of anti-detection transmission based on extended weighted fractional Fourier transform, can solve problems such as poor performance, achieve anti-scanning ability improvement, realize safety performance, and good parameter sensitivity Effect

Active Publication Date: 2022-07-15
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of the poor performance of the existing communication method against interception by the eavesdropping end, and proposes an anti-detection transmission method based on extended weighted fractional Fourier transform

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  • A Detection-Resistant Transmission Method Based on Extended Weighted Fractional Fourier Transform
  • A Detection-Resistant Transmission Method Based on Extended Weighted Fractional Fourier Transform
  • A Detection-Resistant Transmission Method Based on Extended Weighted Fractional Fourier Transform

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specific Embodiment approach 1

[0042] Embodiment 1: Combining figure 1 This embodiment will be described. An anti-detection transmission method based on extended weighted fractional Fourier transform described in this embodiment, the method specifically includes the following steps:

[0043] Step 1: Perform baseband constellation mapping on the 0 and 1 bit data generated by the source to obtain the modulated signal X after the constellation mapping;

[0044] Step 2: Perform M-item extended weighted fractional Fourier transform on the modulated signal X obtained in step 1 to obtain a serial digital signal X T ;

[0045] The specific form of the M-item extended weighted fractional Fourier transform is:

[0046]

[0047] In the formula, Indicates that M-item extended weighted fractional Fourier transform is performed on X, M is the number of weighted items, and M≥4, θ k is the k-th transformation parameter of the positive transformation, X l The lth basis function constructed based on the periodic basi...

specific Embodiment approach 2

[0059] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in the fourth step, the analog modulation signal X obtained in the third step is T0 Perform up-conversion processing to obtain an up-converted signal, where the specific form of the up-converted signal is:

[0060]

[0061] where X T1 is the up-converted signal, f c is the carrier modulation center frequency, t is the timing mark, i is the imaginary unit, Re[ ] represents the real part, and e is the natural logarithm.

[0062] In this embodiment, for the signal X T0 Up-conversion processing refers to: converting the analog modulated signal X T0 Modulate to the corresponding carrier frequency to obtain the data X on the corresponding carrier frequency T1 .

specific Embodiment approach 3

[0063] Embodiment 3: The difference between this embodiment and Embodiment 2 is that in the step 5, the receiving end performs down-conversion processing on the received signal, and the form of the signal received by the receiving end is:

[0064] Y R1 =HX T1 +N T

[0065] where Y R1 is the signal received by the receiver, H is the channel state information matrix, N T is random noise.

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Abstract

An anti-detection transmission method based on extended weighted fractional Fourier transform belongs to the field of communication technology. The invention solves the problem that the existing communication method has poor performance against interception by the eavesdropping terminal. The invention introduces M-item extended weighted fractional Fourier transform into the process of signal processing, so as to realize the enhancement of the anti-interception performance of the signal transform domain. For the partner, due to unitary transformation, the transmitted data can be recovered by correct inverse transformation according to the parameter key shared with the sender; while for the eavesdropper, since the extended weighted transformation has multiple transformation parameters and are independent of each other, it is possible to decipher all The computational complexity of the transformation parameters will be greatly improved. This effectively improves the anti-interception performance of the system, reduces the possibility of illegal brute force cracking of communication information, and improves the physical layer security performance of the communication system. The present invention is applicable to the technical field of secure communication.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to an anti-detection transmission method based on extended weighted fractional Fourier transform. Background technique [0002] In recent years, the development of wireless communication networks is gradually becoming mature, and digital information exchange has become an indispensable part of people's lives. With the rapid increase of the number of users accommodated by the wireless network and the continuous expansion of its application fields, the secure transmission of information has become one of the key concerns. In the field of communication security, the security mechanism with cryptography as the core is very mature and effective, and the physical layer security method can respond well to the defects of the traditional encryption system based on cryptography in the face of wireless communication scenarios. With the addition, it has received extensive att...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/20H04L27/22H04L9/40H04W12/03
CPCH04L27/20H04L27/22H04L63/16
Inventor 沙学军宋鸽房宵杰黄永新
Owner HARBIN INST OF TECH
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