Method for resisting interception and inference for signals based on quadrinomial weighted fractional Fourier transform of multiple-path variable parameters

A technology of fractional Fourier and variable parameters, which is applied in the fields of anti-interception and anti-interference of communication signals, can solve the problems of poor anti-interference performance and poor anti-interception performance, achieve resistance to random and burst interference, improve anti-interception performance and anti-interference performance effect

Inactive Publication Date: 2010-09-15
HARBIN INST OF TECH
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Problems solved by technology

[0011] The present invention aims to overcome the problems of poor anti-intercept performance and poor anti-interference performance in the anti-transmission process of existing communication signals, thereby providing a signal anti-interception and anti-interference method based on four-term weighted fractional Fourier transform of multi-channel variable parameters

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  • Method for resisting interception and inference for signals based on quadrinomial weighted fractional Fourier transform of multiple-path variable parameters
  • Method for resisting interception and inference for signals based on quadrinomial weighted fractional Fourier transform of multiple-path variable parameters
  • Method for resisting interception and inference for signals based on quadrinomial weighted fractional Fourier transform of multiple-path variable parameters

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specific Embodiment approach 1

[0033] Specific implementation mode 1. Combination figure 1 Illustrate this specific embodiment, the signal anti-interception and anti-jamming method based on the four weighted fractional Fourier transforms of multipath variable parameters, it realizes because of following steps:

[0034] The transmitting end:

[0035] Step 1. Perform digital baseband modulation on the digital signal sent by the data source to obtain the modulated signal;

[0036] Step 2, performing m-fold spread spectrum coding on the modulated signal obtained in step 1, to obtain m-channel spread-spectrum coded signals;

[0037] Step 3, performing four-item weighted fractional Fourier transform on each of the m-channel spread-spectrum encoded signals obtained in step 2, to obtain m-channel transformed signals, wherein the i-th channel signal is subjected to four weighted fractional Fourier transforms The dynamic encryption parameter of is α i , the dynamic encryption vector is V i ;

[0038] Step 4. Syn...

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Abstract

The invention discloses a method for resisting interception and inference for signals based on quadrinomial weighted fractional Fourier transform of multiple-path variable parameters, relating to the communication technical field and solving the problems of poor interception resistance and poor interference resistance in the existing transmission resistance process of communication signals. The method comprises the following steps: at a transmitting end: digital signals are modulated by a baseband and then are subjected to spread spectrum encoding and quadrinomial weighted fractional Fourier transform under the control of a dynamic encryption parameter alphai and a dynamic encryption vector Vi, and encryption data synthesized by signals in multiple paths are subjected to digital carrier modulation and then are sent to a channel to transmit after D / A conversion and up-conversion; and at a receiving end: the data after down-conversion and A / D sampling is subjected to digital carrier coherent modulation, is decomposed by the signals in multiple paths, is subjected to quadrinomial weighted fractional Fourier transform for m times under the control of the dynamic encryption parameter alphai and dynamic encryption vector Vi, and is modulated by the baseband. The method is suitable for occasions of communication signal transmission.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a communication signal anti-interception and anti-interference method. Background technique [0002] In today's society, information has become an important wealth of society, and people pay more and more attention to the confidentiality of information. The purpose of confidential communication is to face the attacker and ensure the security of the communication when the communication parties use the insecure channel to communicate. In the process of confidential communication, the communication dual-send does not want or allow the communication information sent by the other party to be intercepted by the other party, otherwise there is a danger of communication leakage, interference, or even destruction. As an important content in modern secure communication, the anti-interception property of information has attracted widespread attention. [0003] Fractional Fourier Tr...

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Application Information

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IPC IPC(8): H04L25/02H04B1/69
Inventor 沙学军梅林张钦宇吴宣利吴少川詹宗超
Owner HARBIN INST OF TECH
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