一种基于正交调制的新型降噪差分混沌键控系统

张刚; 刘金惠; 张天骐

doi:10.11999/JEIT190955

一种基于正交调制的新型降噪差分混沌键控系统

doi: 10.11999/JEIT190955

重庆邮电大学通信与信息工程学院重庆 400065

基金项目: 国家自然科学基金(61771085, 61371164)，重庆市教育委员会科研项目(KJQN201900601)

详细信息

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

刘金惠：女，1996年生，硕士生，研究方向为混沌保密通信

张天骐：男，1971年生，博士后，教授，研究方向为扩频信号的盲处理、神经网络实现以及信号的同步处理

通讯作者:
刘金惠　1342343570@qq.com

中图分类号: TN911.3
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- 被引次数: 0
出版历程
- 收稿日期: 2019-11-25
- 修回日期: 2020-09-15
- 网络出版日期: 2020-12-08
- 刊出日期: 2021-02-23

A Novel Noise Reduction Differential Chaos Shift Keying System Based on Quadrature Modulation

School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications (CQUPT), Chongqing 400065, China

Funds: The National Natural Science Foundation of China (61771085, 61371164), The Research Project of Chongqing Educational Commission (KJQN201900601)

摘要

摘要:
针对降噪差分混沌键控(NR-DCSK)传输速率低的缺点，该文提出一种基于正交调制的新型降噪差分混沌键控(QM-NRDCSK)系统。发生器产生两路混沌序列，每一路的参考信号是信息承载信号的
\begin{document}$P$\end{document}
次重复，不同用户信息通过不同时隙区分，两路信号使用正交调制在相同频带上传输。接收端通过滑动平均滤波器对每一路的参考信号进行
次平均后与信息信号进行非相干解调。通过在AWGN和多径Rayleigh衰落信道下的仿真，验证了理论推导的正确性，并表明该系统在具有较高频谱利用率的同时，能有效提高传输速率且拥有较好的误码性能。
- 差分混沌键控 /
- 滑动平均滤波器 /
- 降噪 /
- 传输速率 /
- 比特误码率
Abstract:
To overcome the shortcomings of low transmission rate of Noise Reduction Differential Chaos Shift Keying (NR-DCSK), a novel Noise Reduction Differential Chaos Shift Keying system based on Quadrature Modulation (QM-NRDCSK) is proposed. The generator generates two chaotic sequences, the reference signal of each channel is P-time repetition of the information-bearing signal. The information of different users is distinguished by different time slots, and the two signals are transmitted on the same frequency band by using quadrature modulation. The reference signal of each channel is averaged P times by the moving average filter at the receiving end, and then non-coherently demodulated with the information signal. The correctness of the theoretical derivation is verified by simulations in AWGN and multi-path Rayleigh fading channels, and it shows that the system can effectively improve the transmission rate and has better bit error performance while having high spectrum utilization.
- Differential Chaos Shift Keying (DCSK) /
- Moving average filter /
- Noise reduction /
- Transmission rate /
- Bit Error Rate (BER)

HTML全文

图 1 QM-NRDCSK系统第$k$帧发送端框图

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图 2 QM-NRDCSK系统第$k$帧接收端框图

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图 3 多径Rayleigh信道模型

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图 4 系统帧结构

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图 5 不同$N$值下系统BER随${E_{\rm{b}}}/{N_0}$变化曲线

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图 6 不同${E_{\rm{b}}}/{N_0}$下系统BER随$N$值变化曲线

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图 7 不同$P$值下系统BER随${E_{\rm{b}}}/{N_0}$变化曲线

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图 8 不同$N$值下系统BER随$P$变化曲线

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图 9 不同信噪比下系统BER随$\beta $变化曲线

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图 10 不同路径下系统BER随${E_{\rm{b}}}/{N_0}$变化曲线

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图 11 不同信道增益下系统BER随${E_{\rm{b}}}/{N_0}$变化曲线

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图 12 Rayleigh信道下不同系统误码性能对比

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