并行载波索引差分混沌移位键控通信方案

doi:10.12305/j.issn.1001-506X.2025.02.31

Abstract

Abstract:

To improve the bit rate and spectral efficiency of carrier index differential chaos shift keying (DCSK) communication system, a parallel carrier index DCSK communication scheme is proposed. Transmitter performs index modulation on a number of carriers for several times and generates multiple data-bearing signals. These signals are transmitted simultaneously based on orthogonal Walsh codes. To explore the similarity among different data-bearing signals, demodulation is performed based on noise reduction and correlations between different data-bearing signals. Theoretical bit error rate (BER) expressions are derived and simulated in the additive white Gaussion noise and multipath Rayleigh fading channels. Results show that the proposed scheme can significantly improve both the spectral efficiency and BER rate performance.

Key words: differential chaos shift keying (DCSK), carrier index modulation, Walsh codes, spectral efficiency, bit error rate (BER)

CLC Number:

TN918

Zhu MENG, Hua YANG, Xinyu MA, Guoping JIANG. Parallel carrier index differential chaos shift keying communication scheme[J]. Systems Engineering and Electronics, 2025, 47(2): 650-658.

Figures/Tables 12

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索引比特	子载波系数	索引比特	子载波系数
000	10000000	100	00001000
001	01000000	101	00000100
010	00100000	110	00000010
011	00010000	111	00000001

系统	频谱效率
MC-DCSK^[15]	$ \frac{M-1}{M B}$
CI-DCSK^[24]	$ \frac{\log _2(M-1)+1}{M B}$
2CI-DCSK^[28]	$\frac{2 \log _2(M-1)+2}{M B} $
HIM-MC-DCSK^[27]	$ \frac{2(M-1)}{M B}$
PC1-DCSK	$ \frac{K \log _2 M+K-1}{M B}$

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