Chaotic Communication System of Noise Reduction Improved Multiple User Multiple Ary Correlated Delay Shift Keying

doi:10.12141/j.issn.1000-565X.210755

Abstract

Abstract:

In view of the poor transmission efficiency of Correlation Delay Shift Keying (CDSK) system, this study proposed a noise reduction improved multiple user multiple ary correlated delay shift keying (NR-I-MUMA-CDSK) based on Schmidt Orthogonalization Chaotic communication system. The system uses Schmidt orthogonalisation to generate N different sets of orthogonal chaotic sequences at the transmitter side, and then copies the generated sequences P times. It also employed multiple ary information mapping and multi-carrier technology, enabling each user to carry K bits of data. It also designed to transmit N sets of user information on a single carrier wave by superimposing N different orthogonal chaotic signal carriers. The transmission rate and energy efficiency of the system were improved. The receiver uses the moving average filter to process the signal, reducing the noise variance from $N 0 / 2$ to $N 0 / 2 P$ . This reduces noise interference, which in turn reduces the system bit error rate(BER). The theoretical formula derivation and simulation analysis of the system in Additive White Gaussian Noise (AWGN) and Rayleigh fading channel were carried out respectively. The results show that, compared with CDSK, the system improves the information transmission rate and energy efficiency. The information transfer rate increases with N and K, and the average bit energy decreases by nearly 100% with K. The effects of different parameters on the system BER were verified by simulation. The results show that the system BER is inversely proportional to P and the binary number M, directly proportional to N and R, and consistent with the deduction of theoretical formulas under both channels. The effects of path number L and path gain on the bit error rate were verified by simulation in Rayleigh fading channel. Compared with many chaotic communication systems, the system BER is greatly reduced, and the system BER decreases with the increase of M, which proves that the system has good theoretical value and practical engineering significance.

Key words: chaotic communication, Correlation Delay Shift Keying, multiple user, multiple ary, Schmidt orthogonalization, multiple carriers

CLC Number:

TN911.3

HE Lifang, WANG Lei, ZHANG Tianqi . Chaotic Communication System of Noise Reduction Improved Multiple User Multiple Ary Correlated Delay Shift Keying[J]. Journal of South China University of Technology(Natural Science Edition), 2022, 50(10): 94-105.

Figures/Tables 19

Fig.1

Table 1

Fig.2

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Fig.5

Table 2

Complexity of different systems"

系统名称

加法器

数量

乘法器数量

延时单元个数

NR-I-MUMA-CDSK

(N + 2) β

[3 N (M + 1) + M + 3] β

CDSK

β

2 β

Table 2

Fig.6

Fig.7

Fig.8

Fig.9

Fig.10

Fig.11

Fig.12

Fig.13

Fig.14

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Fig. 17

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二进制比特	传输系数
0 0	1 0 0 0
0 1	0 1 0 0
1 0	0 0 1 0
1 1	0 0 0 1

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