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Improved multi-user DCSK chaotic communication system

A multi-user system and chaotic communication technology, applied in the field of improved multi-user DCSK chaotic communication system, can solve the problems of poor bit error performance and low transmission rate

Inactive Publication Date: 2020-10-13
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0006] The invention proposes an improved multi-user DCSK chaotic communication system aiming at the problems of poor bit error performance and low transmission rate of the differential chaos keying (DCSK) system

Method used

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  • Improved multi-user DCSK chaotic communication system
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  • Improved multi-user DCSK chaotic communication system

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Embodiment Construction

[0019] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings. First of all, in order to solve the problem of poor bit error performance caused by interference components between signals, this paper uses an improved chaotic signal generator. figure 1 is the structure diagram of the generator, which generates a chaotic sequence x of length β i,k , the sequence is generated by the Logistic chaotic map, and then it is divided into two paths, the first path directly outputs x i,k , the second way will x i,k After passing through the editor, it is converted to The role of the editor is to change the chaotic sequence x i,k The value of the odd position is set to the opposite number, and then the value of the odd position is exchanged with the value of the adjacent even position. The specific generation process is expressed as follows:

[0020]

[0021] figure 2 It is a structural diagram of the sending en...

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Abstract

The invention discloses an improved multi-user DCSK chaotic communication system, and belongs to the technical field of communication. A traditional differential chaos shift keying (DCSK) modulation technology is improved so as to achieve the purpose of improving the bit error rate performance. An improved chaotic signal generator is used at a sending end to generate a group of orthogonal chaoticsequences xi and k, so that each path of information signal can transmit two bits and is expanded into multiple users, and each frame of signal can transmit 2N information bits. At a receiving end, received signals ri and k are converted through an editor used by the sending end, then corresponding correlation operation is carried out, and after threshold judgment is carried out, corresponding bitinformation can be recovered, wherein the threshold judgment criterion is as follows: if the output result of the related demodulator is greater than or equal to 0, the sent information signal is judged to be '+1'; otherwise, it is judged that the sent information signal is'-1'. Compared with a DCSK system, an OMU-DCSK system and an NISI-MU-CDSK system, the system provided by the invention has better error code performance. Therefore, the improved multi-user DCSK chaotic communication system has important application value in the field of communication.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to an improved multi-user DCSK chaotic communication system, which is obtained by improving a chaotic signal generator in a classical differential chaos keying (DCSK) modulation technology and performing multi-user extension. Background technique [0002] In 1990, researchers at the U.S. Naval Laboratory first discovered through experiments that two coupled chaotic systems can be synchronized and produce the same chaotic trajectory using the drive-response method. This breakthrough discovery opens up the possibility of applying chaos theory to the field of communication. Since then, many scholars at home and abroad have begun to study and use chaos control and chaos synchronization to realize secure communication, officially opening the application of chaos theory in the field of communication and information security. [0003] Chaotic signals have complex characteristics such ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00H04L9/00
CPCH04L27/001H04L9/001
Inventor 张刚和华杰何平王磊雷家洪贺利芳
Owner CHONGQING UNIV OF POSTS & TELECOMM
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