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Correlation delay-differential chaos shift keying-based modulation communication method

A differential chaotic keying and correlation delay technology, applied in the field of communication, can solve the problems of reduced anti-noise performance, low transmission rate, low confidentiality, etc.

Inactive Publication Date: 2011-03-16
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the existing chaotic keying schemes, DCSK (differential chaotic keying) with incoherent demodulation has been proved to have the best robustness and bit error rate performance, but there are two main shortcomings of DCSK at present: one is in When the bit energy is constant, the transmission rate is low; the other is that two identical or opposite reference signals and information signals are transmitted on the channel within one symbol period, which are easily deciphered after being intercepted during transmission, so the confidentiality is relatively Low
CDSK (correlated delay keying) can be regarded as a variant of DCSK. Compared with DCSK, the CDSK transmitter replaces the switch structure with an adder, and the transmitter can work continuously, and the delay time does not need to be equal to half a symbol period, and The signal is more uniform, and it is not easy to be deciphered after interception, but it pays the price of reduced anti-noise performance
QCSK (Quadrature Chaotic Phase Shift Keying) can be regarded as a combination of two DCSK systems, but QCSK trades the complexity of the system for double the data transmission rate, and the two Hilbert transforms used in the modulation of the QCSK system are in the actual circuit Difficult to implement in application

Method used

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  • Correlation delay-differential chaos shift keying-based modulation communication method
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  • Correlation delay-differential chaos shift keying-based modulation communication method

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Effect test

Embodiment 1

[0045] Embodiment 1: A communication method based on correlation delay-differential chaotic keying modulation in the present invention, by performing correlation delay transmission on the chaotic signal at the sending end, two useful signals are simultaneously transmitted in the first and second half symbol periods, and at the receiving end, After the correlation delay operation of the correlator, the useful signals a and b are demodulated respectively, and then the original transmission signal can be obtained through parallel-to-serial conversion; the specific steps are as follows:

[0046] Let x(t) be a set of signals generated by the chaotic oscillator, T b The time required to transmit a bit signal, τ represents the delay time, and the relative delay-differential chaotic keying modulation is in the front and rear Tb In the / 2 symbol period, the 2-bit useful signals a and b obtained through serial-to-parallel conversion are respectively modulated into the transmission inform...

Embodiment 2

[0074] Example 2: Combining figure 1 -- Figure 7 , select the logistic chaotic map as the chaotic emission system, and the logistic equation is:

[0075] x n+1 =ux n (1-x n )u∈[0,4]x∈[0,1] (6)

[0076] The block diagram of CD-DCSK communication system modulation and demodulation is as follows: figure 1 and figure 2 As shown, the performance of the CD-DCSK communication system is analyzed through computer simulation. First, analyze the realizability of the system from the time domain, useful signals to be transmitted such as image 3 As shown, the binary "0, 1" sequence to be transmitted is first modulated into a "+1, -1" sequence, and then modulated and sent through the transmitter, through Figure 4 It can be seen that the received signal is demodulated well at the receiving end.

[0077] In the AWGN channel, comparing the bit error rate performance of the CD-DCSK system and the QCSK system with the same symbol transmission rate as Figure 5 shown. By analyzing t...

Embodiment 3

[0080] Embodiment 3: the technical scheme that the present invention adopts is as follows:

[0081] Let x(t) be a set of signals generated by the chaotic oscillator, T b The time required to transmit a bit signal, τ represents the delay time, and the relative delay-differential chaotic keying modulation is in the front and rear T b In the / 2 symbol period, the 2-bit useful signals a and b obtained through serial-to-parallel conversion are respectively modulated into the transmission information, and double the spectrum utilization rate is obtained. The two-digit signals of a and b can be respectively selected from 4 situations of "+1+1, -1+1, +1-1, -1-1". At the modulator side, the former T b / 2 symbol period, the transmitted signal s(t) a is the superposition of the chaotic signal x(t) and the chaotic signal x(t-τ / 2) delayed by τ / 2 and modulated by the a signal; after T b In / 2 symbol period, the chaotic signal delayed by τ is modulated by the b signal, and then added to ...

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Abstract

The invention provides a correlation delay-differential chaos shift keying (CD-DCSK)-based modulation communication method with the advantages of high antijamming capacity, simple circuit structure and low cost. A chaos signal at a transmitting end is subjected to related delay transmission; in front and back two-half symbol periods, two useful signals are transmitted simultaneously; and at a receiving end, the useful signals are subjected to related delay operation of a correlator and are respectively demodulated into useful signals a and b, and the useful signals a and b are subjected to serial conversion to form the original transmitting signals. The method has the advantages of high security of correlation delay shift keying (CDSK), low error rate of differential chaos shift keying (DCSK) and the like; and signals transmitted in channels are more uniform, and have high security and low error rate, and the data transmission rate is 2 times that of the DCSK. Besides, on the implementation of hardware circuits, the CD-DCSK is simpler than QCSK (quadrature chaos shift keying). The method ensures high security, high data transmission rate, higher antijamming capacity and low cost, and is easy to promote.

Description

(1) Technical field [0001] The invention relates to communication technology, specifically a communication method based on correlation delay-differential chaotic keying modulation. (2) Background technology [0002] In recent years, chaotic communication technology has become one of the research hotspots at home and abroad. Compared with traditional communication technology, chaotic communication system has the advantages of high confidentiality and strong anti-interference. At present, the international research on chaotic communication system mainly focuses on Chaos masking, chaotic parameter modulation and chaotic keying are three types of communication methods. Chaotic masking can mask both analog and digital signals. One of the ways of chaotic masking is to directly superimpose information on the noise-like chaotic signal. When demodulating, the demodulator needs to regenerate the chaotic signal. Although this method is simple, it needs a good robust synchronization ci...

Claims

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Application Information

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IPC IPC(8): H04L27/00
Inventor 丁群王佳楠
Owner HEILONGJIANG UNIV
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