改进型正交多载波降噪差分混沌键控通信系统

doi:10.12305/j.issn.1001-506X.2021.10.37

Abstract

Abstract:

The drawbacks of the traditional multicarrier differential chaos shift keying system are relating to poor bit error performance, low transmission rate and low energy efficiency. Thus, an improved quadrature multicarrier noise reduction differential chaos shift keying system, combining with switches, Hilbert transformation technology and quadrature modulation technology is proposed. At the transmitter, reference signal is duplicated from odd frame to a consecutive even frame by using switches, and quadrature modulation and Hilbert transformation technology are further introduced to improve the transmission rate. At the receiver, the moving average filter is introduced to average the received signals to improve the bit error performance of the system. The bit error rate formula of IQMC-NR-DCSK system under additive white Gaussian noise channel and multi-path Rayleigh fading channel are derived respectively, and the numerical simulations are also carried out. The results show that IQMC-NR-DCSK system can effectively enhance the bit error performance, transmission rate and energy efficiency, when comparing with the multicarrier differential chaos shift keying system.

Key words: chaotic communication, multicarrier modulation, quadrature modulation, noise reduction, multipath Raleigh fading channel

CLC Number:

TN911.3

Lifang HE, Xueshuang WU, Peng ZHANG, Jun CHEN. Improved quadrature multicarrier noise reduction differential chaos shift keying communication system[J]. Systems Engineering and Electronics, 2021, 43(10): 3008-3016.

Figures/Tables 14

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References 30

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系统名称	TR	EE	BE
MC-DCSK	(M-1)/β	(M-1)/M	(M-1)/(Mβ(1+α))
QMC-DCSK	(2M-2)/β	(2M-2)/(2M-1)	(2M-2)/(Mβ(1+α))
IQMC-NR-DCSK	(4M-3)/β	(8M-6)/(8M-5)	(4M-3)/(Mβ(1+α))

系统名称	乘法器数量	加法器数量	开关个数	延迟单元个数
MC-DCSK	(2M-1)β	(M-1)β	0	0
QMC-DCSK	(4M-3)β	2(M-1)β	0	0
IQMC-NR-DCSK(k为奇数)	(6M-5)β	4(M-1)β	2	1
IQMC-NR-DCSK(k为偶数)	(6M-3)β	(4M-3)β	2	0

L	$ {{\bar \gamma }_l}$	τ_l
2	1/2, 1/2	0, 1
3(等增益)	1/3, 1/3, 1/3	0, 1, 2
3(非等增益)	1/3, 1/3, 1/3	0, 1, 2
4	1/4, 1/4, 1/4, 1/4	0, 1, 2, 3
5	1/5, 1/5, 1/5, 1/5, 1/5	0, 1, 2, 3, 4

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Improved quadrature multicarrier noise reduction differential chaos shift keying communication system

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