降噪改进型多载波CDSK混沌通信系统

doi:10.12305/j.issn.1001-506X.2021.05.28

Abstract

Abstract:

Due to the high bit error rate (BER) for traditional correlation delay shift keying (CDSK) system, a noise reduction improved multi-carrier CDSK (NR-I-MC-CDSK) system is proposed. At the transmitter, the chaotic signal generator is improved by using the editor so that each information signal can bear 2 bits of information. Then the system is combined with the multi-carrier technology to make each frame transmit 2N bits of information. At the receiver, the noise reduction method of filter is used to reduce the variance of the interference term in the decision variable and the corresponding information bit is demodulated through zero crossing. Using two different kinds of channel model, the system signal transmission process under the condition of ideal channel condition and the actual channel is studied. The BER formulae of the system under different channel conditions is derived. Finally, the simulation and performance analysis of the system are carried out. The results show that the proposed chaotic communication system has good performance in BER and data transmission rate.

Key words: chaotic communication, correlation delay shift keying (CDSK), noise reduction, multi-carrier

CLC Number:

TN911.3

Gang ZHANG, Huajie HE, Peng ZHANG. Noise reduction improved multi-carrier CDSK chaotic communication system[J]. Systems Engineering and Electronics, 2021, 43(5): 1389-1397.

Figures/Tables 13

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References 20

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系统	传输BR	平均比特能量E_b	SE
MC-DCSK	$\frac{M-1}{\beta T_{c}}$	$\frac{M \beta E\left[x_{i, k}^{2}\right]}{M-1}$	$\frac{M-1}{M \beta(1+\alpha)}$
QMC-DCSK	$2 \frac{M-1}{\beta T_{c}}$	$\frac{(2 M-1) \beta E\left[x_{i, k}^{2}\right]}{2(M-1)}$	$\frac{2(M-1)}{M \beta(1+\alpha)}$
SA-MC-DCSK	$\frac{M-N_{P}}{\beta T_{c}}$	$\frac{M \beta \mathrm{E}\left[x_{i, k}^{2}\right]}{2\left(M-N_{P}\right)}$	$\frac{M-N}{M \beta(1+\alpha)}$
NR-I-MC-CDSK	$\frac{2(M-1)}{\beta T_{c}}$	$\frac{(2 M-1) \beta E\left[x_{i, k}^{2}\right]}{2(M-1)}$	$\frac{2(M-1)}{M \beta(1+\alpha)}$

信道数L	信道增益E[λ_l²]	信道延迟τ_l
2	$\frac{1}{2}$, $\frac{1}{2}$	0, 1
3	$\frac{1}{3}$, $\frac{1}{3}$, $\frac{1}{3}$	0, 1, 2
4	$\frac{1}{4}$, $\frac{1}{4}$, $\frac{1}{4}$, $\frac{1}{4}$	0, 1, 2, 3
5	$\frac{1}{5}$, $\frac{1}{5}$, $\frac{1}{5}$, $\frac{1}{5}$, $\frac{1}{5}$	0, 1, 2, 3, 4

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Noise reduction improved multi-carrier CDSK chaotic communication system

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