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

摘要/Abstract

摘要：

为提高载波索引差分混沌移位键控通信系统的传输速率和频谱效率, 提出一种并行载波索引差分混沌移位键控通信方案。发射端重复使用有限的载波索引资源进行多次索引调制, 生成多路信息信号并借助正交Walsh码实现并行传输; 接收端利用各路信息信号之间的相似性, 在分段降噪和不同路信息信号之间相关值的基础上完成解调。推导所提方案在加性高斯白噪声和多径Rayleigh衰落信道中的理论误码率(bit error rate, BER)并完成仿真验证。结果表明, 所提方案不但可以大幅提升频谱效率, 而且可以明显改善BER性能。

关键词: 差分混沌移位键控, 载波索引调制, Walsh码, 频谱效率, 比特误码率

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)

中图分类号:

TN918

孟竹, 杨华, 马新玉, 蒋国平. 并行载波索引差分混沌移位键控通信方案[J]. 系统工程与电子技术, 2025, 47(2): 650-658.

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.

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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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