Anti-detection transmission method based on extended weighted fractional Fourier transform

A fractional Fourier and transmission method technology, applied in the field of anti-detection transmission based on extended weighted fractional Fourier transform, can solve problems such as poor performance, and achieve the effect of improving anti-scanning ability, improving parameter dimension, and improving performance

Active Publication Date: 2020-09-01
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Anti-detection transmission method based on extended weighted fractional Fourier transform
  • Anti-detection transmission method based on extended weighted fractional Fourier transform
  • Anti-detection transmission method based on extended weighted fractional Fourier transform

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specific Embodiment approach 1

[0042] Specific implementation mode one: combine 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 information source to obtain the modulated signal X after 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 extended weighted fractional Fourier transform is:

[0046]

[0047] In the formula, Indicates that X is subjected to M-item extended weighted fractional Fourier forward transform, M is the number of weighted items, and M≥4, θ k is the kth transformation parameter of the forward transformation, X l The l-th basis function constructe...

specific Embodiment approach 2

[0059] Specific embodiment two: the difference between this embodiment and specific embodiment one is: in the step four, the analog modulation signal X obtained in step three 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:

[0060]

[0061] Among them, X T1 is the signal after up-conversion processing, f c is the carrier modulation center frequency, t is the timing mark, i is the imaginary number unit, Re[·] represents the real part, and e is the natural logarithm.

[0062] 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 .

specific Embodiment approach 3

[0063] Specific embodiment three: the difference between this embodiment and specific embodiment two is: in the step five, 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] Among them, 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

The invention discloses an anti-detection transmission method based on extended weighted fractional Fourier transform, and belongs to the technical field of communication. According to the invention,the problem of poor anti-eavesdropping end interception performance of the existing communication method is solved. According to the invention, M extended weighted fractional Fourier transforms are introduced into the signal processing process to realize the enhancement of the anti-interception performance of the signal transform domain. For a partner, due to unitary transformation, sending data can be recovered by correct inverse transformation according to a parameter key shared with a sending end; for an eavesdropping end, because the extended weighted transformation has a plurality of transformation parameters and the transformation parameters are mutually independent, the calculation complexity of decoding all the transformation parameters is greatly improved. Therefore, the anti-interception performance of the system is effectively improved, the possibility that the communication information is cracked illegally and violently is reduced, and the physical layer safety performanceof the communication system is improved. The method is suitable for the technical field of secret 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 most concerned issues. 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 well deal with the defects of the traditional encryption system based on cryptography in the face of wireless communication scenarios. With supplements, it has received extens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/20H04L27/22H04L29/06H04W12/00
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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