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A Repetitive Correlation Delay Keying Method for Improving the Performance of Wireless Chaotic Communication System

A related delay, chaotic communication technology, applied in wireless communication, secure communication through chaotic signals, transmission systems, etc., can solve the problems of increasing hardware complexity, increasing delay units, poor bit error performance, etc. Secure message transfer, low complexity effects

Active Publication Date: 2019-07-16
SUN YAT SEN UNIV
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Problems solved by technology

However, the system needs to add delay units and multipliers, greatly increasing the hardware complexity
The literature "Q.Ding, J.N.Wang, Design of frequency-modulated correlation delay shift keying chaotic communication system [J], IET Communications, 5(7), 2011, 901-905" combines frequency modulation and CDSK, and proposes frequency modulation chaotic difference Key modulation technology (Frequency Modulation CDSK, FM-CDSK), which improves the security performance and transmission rate, but its bit error performance is poor

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  • A Repetitive Correlation Delay Keying Method for Improving the Performance of Wireless Chaotic Communication System
  • A Repetitive Correlation Delay Keying Method for Improving the Performance of Wireless Chaotic Communication System
  • A Repetitive Correlation Delay Keying Method for Improving the Performance of Wireless Chaotic Communication System

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[0037] The present invention will be further described below in conjunction with the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0038] Such as image 3 As shown in , the transmitter of R-CDSK continues to transmit the linear operation symbols of the chaotic modulation signal and the reference chaotic signal. The difference from CDSK is that for the same information bit, the R-CDSK transmitter controls by using a switch to send the differential modulation symbol representing the same bit information twice in succession: the first time is the sum of the reference chaotic signal and the chaotic modulation signal, and the second time is the sum of the reference chaotic signal and the chaotic modulation signal. The second is the difference between the two, and its mathematical expression is as follows:

[0039]

[0040] In the formula: S i and S i ' Represents the sum and difference of the reference chaotic signal and the ch...

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Abstract

The invention provides a repetitive correlation delay shift keying method for improving performance of a wireless chaos communication system. According to the method, a switch is added to a correlation delay shift keying (CDSK) emission end, namely an emission end of a repetitive correlation delay shift keying R-CDSK is in two symbol periods, a chaos modulation signal and a differential chaos modulation signal corresponding to one same information are continuously sent, and a common reference chaos signal of the chaos modulation signal and the differential chaos modulation signal is further sent. The method makes full of time diversity of a wireless channel, a transmission bit error rate is reduced through repetitively sending the mutually-differential chaos modulation signals, CDSK reliability is effectively improved, moreover, the information sent by the R-CDSK is a differential modulation symbol of the bearing information, so safety communication performance of the system is improved. Compared with schemes in the prior art, the method has relatively lower complexity, and an information transmission mode which is more reliable than a CDSK mode and is safer than a DCSK mode is realized.

Description

technical field [0001] The invention faces the field of wireless chaotic communication, and proposes an improved repetitive correlation delay keying modulation method for improving system reliability and security. Background technique [0002] Due to the broadcast characteristics of wireless channels, information transmission is vulnerable to malicious attacks and malicious eavesdropping. Chaotic sequences have been widely used in high-security wireless communication systems due to their characteristics of initial value sensitivity, aperiodicity, and infinite length. The technique of modulating signal with chaotic sequence can be divided into coherent chaotic modulation and incoherent chaotic modulation. Among them, the incoherent chaotic modulation has stronger practicability because it does not need to use a complex chaotic synchronization circuit at the receiving end to reply to the reference chaotic signal. [0003] Among the existing incoherent chaotic modulation tech...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/00H04W24/06H04J13/00
CPCH04J13/0018H04L9/001H04W24/06
Inventor 张琳饶伟炜沈金田
Owner SUN YAT SEN UNIV
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