基于施密特正交化的降噪多载波相关延迟键控混沌通信系统

张刚; 和华杰; 张鹏

doi:10.11999/JEIT200165

基于施密特正交化的降噪多载波相关延迟键控混沌通信系统

doi: 10.11999/JEIT200165

张刚¹,
和华杰^1, ,,
张鹏²

1.
重庆邮电大学通信与信息工程学院重庆 400065
2.
重庆邮电大学教务处重庆 400065

基金项目: 国家自然科学基金(61771085)，重庆市教育委员会科研项目(KJ1600407, KJQN201900601)

详细信息

作者简介:
张刚：男，1976年生，博士，教授，主要研究方向为混沌同步、混沌保密通信

和华杰：男，1995年生，硕士生，研究方向为混沌保密通信

张鹏：男，1980年生，硕士，高级工程师，主要研究方向为智能科学、保密通信

通讯作者:
和华杰　641798020@qq.com

中图分类号: TN911.3
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出版历程
- 收稿日期: 2020-03-10
- 修回日期: 2020-12-01
- 网络出版日期: 2020-12-18
- 刊出日期: 2021-07-10

NR-MC-CDSK Chaotic Communication System Based on Schmidt Orthogonalization

1.
School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
2.
Office of Teaching Affairs, Chongqing University of Posts and Telecommunications, Chongqing 400065, China

Funds: The National Natural Science Foundation of China (61771085), The Research Project of Chongqing Educational Commission (KJ1600407, KJQN201900601)

摘要

摘要: 为解决传统相关延迟键控(CDSK)混沌通信系统存在的误码(BER)性能差的问题，该文提出一种基于施密特正交化的降噪多载波相关延迟键控(NR-MC-CDSK)混沌通信系统。在发送端，利用施密特正交化算法产生N组完全正交的混沌载波，并复制P次作为参考信号，与N个信息信号叠加进行传输，并利用多载波技术，复用每帧信号传输MN个用户信息。在接收端，将信号经匹配滤波器解调，然后通过滑动平均滤波器降噪，并进行相关解调。推导了系统在加性高斯白噪声(AWGN)信道和多径Rayleigh衰落信道中的BER公式并进行了仿真分析，结果表明系统的BER性能优于众多多载波混沌通信系统，数据传输速率也相较CDSK系统有明显提升，为该系统在实际通信系统中的应用提供了理论依据，并显示了较强的应用价值。
- 混沌通信 /
- 延迟相关键控 /
- 施密特正交化 /
- 降噪 /
- 多载波
Abstract: In order to solve the shortcomings of high Bit Error Rate (BER) in traditional Correlation Delay Shift Keying (CDSK) chaotic communication system, a Noise Reduction Multi-Carrier Correlated Delay Shift Keying (NR-MC-CDSK) chaotic communication system based on Schmidt orthogonalization is proposed. At the transmitter, Schmidt orthogonalization algorithm is used to generate N completely orthogonal chaotic signals which are copied P times as reference signals. N information signals are added up for transmission in each group and multi-carrier is used to transmit MN user information per frame. At the receiver, the signal is demodulated by a matched filter, then the signal is averaged by a moving average filter to suppress the noise and demodulated by correlation. The BER formula of the system in Additive White Gaussian Noise (AWGN) channel and multipath Rayleigh fading channel are derived and simulated. The results show that the BER performance of the system is better than that of many multi-carrier chaotic communication systems and the data transmission rate is improved obviously compared with CDSK system. Theoretical basis for the future application of the system to practical communication systems is provided in the paper and shows strong feasibilities in future engineering application.
- Chaotic communication /
- Correlation Delay Shift Keying (CDSK) /
- Schmidt orthogonalization /
- Noise reduction /
- Multi-carrier

HTML全文

图 1 NR-MC-CDSK系统发送端框图

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图 2 NR-MC-CDSK系统的功率谱密度

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图 3 多径Rayleigh衰落信道模型

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图 4 NR-MC-CDSK系统接收端框图

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图 5 滑动平均滤波器结构

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图 6 AWGN信道下，系统有无施密特正交化的BER性能对比图

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图 7 AWGN信道下，系统BER随$\beta $的变化曲线

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图 8 每组用户数$N$与系统BER性能的关系曲线图

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图 9 组数$M$与系统BER性能的关系曲线图

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图 10 处于不同复制次数$P$的系统BER性能与其他系统比较的曲线图

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