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CD-DCSK chaos communication scheme without signal mutual interference

A technology of inter-signal interference and chaotic communication, applied in the field of communication, can solve the problems of poor bit error performance, low transmission rate of differential chaotic shift keying, etc., and achieve the effect of increasing the information transmission rate

Inactive Publication Date: 2019-02-15
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0006] The invention proposes a CD-DCSK chaotic communication scheme without inter-signal interference for the problems of poor bit error performance of the correlated delay shift keying (CDSK) system and low transmission rate of the differential chaotic shift keying (DCSK) system

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  • CD-DCSK chaos communication scheme without signal mutual interference
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  • CD-DCSK chaos communication scheme without signal mutual interference

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Embodiment Construction

[0020] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0021] In order to solve the problem of poor bit error performance caused by interference components between signals, an orthogonal chaotic signal generator is used in this paper to generate two strictly orthogonal chaotic signals. Its structural block diagram is as figure 1 As shown, the generated two chaotic signals satisfy the formula (1):

[0022]

[0023] where p i ,q i Represent the two chaotic signals generated by the orthogonal signal generator, according to the definition of the spreading factor, 2β is the spreading factor of the system. In addition, the two chaotic signals generated also satisfy:

[0024]

[0025] Its orthogonal principle is as follows: in the first β / 2 time, the signal p i and signal q i The output values ​​are the same; in the latter β / 2 time, the output values ​​are opposite. This ensures that the signa...

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Abstract

The invention discloses a CD-DCSK chaos communication scheme without signal mutual interference, and the scheme belongs to the technical field of communication. The conventional CDSK (Correlation Delay Shift Keying) modulation technology is combined with the DCSK (Differential Chaos Shift Keying) modulation technology, a simple orthogonal chaos signal generator is used, thus, an aim of improving error code performance without changing information transmission rate of a CDSK system can be realized. A receiving end extracts data information through related demodulation. Correlation operation isexecuted for received signals and corresponding delay signals thereof through a correlator, then, threshold decision making is executed respectively, thus, data information can be recovered. A threshold decision making criterion is as follows: if an output result of a correlation demodulator is greater than or equal to 0, judging that the sent information signal is '+1'; and otherwise, judging that the sent information signal is '-1'. The information transmission rate of the scheme is twice of the information transmission rate of a DCSK system, and error code performance is improved remarkablyin comparison with the CDSK system. So, the scheme provided by the invention 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 a CD-DCSK chaotic communication scheme without inter-signal interference, which is a combination of classic correlated delay shift keying (CDSK) modulation technology and differential chaotic shift keying (DCSK) modulation technology . 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 charact...

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Application Information

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IPC IPC(8): H04L9/00H04L27/20
CPCH04L9/001H04L27/20
Inventor 贺利芳陈俊吴雪霜胡静怡赵畅畅张天骐
Owner CHONGQING UNIV OF POSTS & TELECOMM
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