正交多载波降噪差分混沌键控通信系统

贺利芳; 吴雪霜; 张天骐

doi:10.11999/JEIT200068

正交多载波降噪差分混沌键控通信系统

doi: 10.11999/JEIT200068

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(KJ1600407, KJQN201900601)

详细信息

作者简介:
贺利芳：女，1979年生，硕士，副教授，研究方向为混沌保密通信、微弱信号检测

吴雪霜：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、语音信号处理、神经网络实现以及信号的同步处理

通讯作者:
吴雪霜　3319154122@qq.com

中图分类号: TN911.3
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出版历程
- 收稿日期: 2020-01-16
- 修回日期: 2020-07-07
- 网络出版日期: 2020-07-22
- 刊出日期: 2021-04-20

Quadrature Multicarrier Noise Reduction Differential Chaos Shift Keying System

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

Funds: The National Natural Science Foundation of China (61771085, 61371164), The Research Project of Chongqing Educational Commission (KJ1600407, KJQN201900601)

摘要

摘要: 为解决多载波差分混沌移位键控(MC-DCSK)系统传输速率低和误码性能差的缺点，该文提出一种正交多载波降噪差分混沌移位键控(QMC-NR-DCSK)系统。在发送端，预定义载波用于发送参考信号，剩余M-1个不同中心频率的载波及其经正交调制技术后得到的频率相同但相位正交的载波都用于传输信息信号，此外，通过进一步引入Hilbert变换，将系统的频带利用率和传输速率提升为MC-DCSK系统的4倍。在接收端引入滑动平均滤波器的降噪操作降低了噪声的方差，从而改善了系统误码性能。推导了QMC-NR-DCSK系统在加性高斯白噪声(AWGN)信道和多径瑞利衰落(RFC)信道下的比特误码率公式并进行了仿真。仿真结果和理论分析表明：QMC-NR-DCSK系统能有效提升传输速率、带宽效率和误码性能，为该系统应用于多载波无线通信提供理论参考。
- 混沌通信 /
- 多载波调制 /
- 正交调制 /
- 滑动平均滤波器 /
- Hilbert变换 /
- 传输速率
Abstract: The major drawbacks of MultiCarrier Differential Chaos Shift Keying (MC-DCSK) system are relating to low data rate and poor bit error performance. Therefore a Quadrature MultiCarrier Noise Reduction Differential Chaos Shift Keying (QMC-NR-DCSK) system is proposed to improve the performances of MC-DCSK system. At the transmitter, reference signal is transmitted on the predefined carrier. While the remaining M-1 carriers and the carriers with orthogonal phase at the same frequency are all used to transmit information signals by using Quadrature Modulation technology, and the data-rate to bandwidth ratio and transmission rate of which are four times higher than that of MC-DCSK system by further introducing Hilbert transformation. The noise reduction operation of the moving average filter is introduced to reduce the variance of noise at the receiver, thereby improving the bit error performance of the QMC-NR-DCSK system. The bit error rate formula and simulations of QMC-NR-DCSK system under Additive White Gaussian Noise (AWGN) channel and multi-path Rayleigh Fading Channel (RFC) are carried out respectively. The results show that QMC-NR-DCSK system can effectively improve the transmission rate, data-rate to bandwidth ratio and bit error performance, which provides a theoretical reference for the application of the multicarrier communication systems.
- Chaotic communication /
- Multicarrier modulation /
- Quadrature modulation /
- Moving average filter /
- Hilbert transform /
- Transmission rate

HTML全文

图 1 QMC-NR-DCSK系统发送机结构

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图 2 $s(t)$的功率谱密度

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图 3 QMC-NR-DCSK接收机结构图

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图 4 多径RFC信道模型

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图 5 两种不同信道下，M变化对BER的影响

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图 6 两种不同信道下，P变化对BER的影响

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图 7 两种不同信道下，不同系统误码性能对比图

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图 8 BER随多径路数L变化的曲线

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图 9 BER随${\tau _2}$变化的曲线

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表 1 几种多载波系统间TR, EE和EB的对比

系统名称	传输速率${\rm{TR}}$	能量效率${\rm{EE}}$	带宽效率${\rm{BE}}$
MC-DCSK	${ {(M - 1)} / \beta}$	${ {M - 1} / \beta}$	${{(M - 1)} / {(M\beta (1 + \alpha ))}}$
QMC-DCSK	${ {2(M - 1)} / \beta}$	${{(M - 1)} / {(M - {1 / 2})}}$	${{2(M - 1)} / {(M\beta (1 + \alpha ))}}$
SA-MCDCSK	${ {(M - N)} / \beta}$	${{(M - N)} / M}$	${{(M - N)} / {(M\beta (1 + \alpha ))}}$
QMC-NR-DCSK	$4{ {(M - 1)} / \beta}$	${{(M - 1)} / {(M - {3 / 4})}}$	${{4(M - 1)} / {(M\beta (1 + \alpha ))}}$

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表 2 多径RFC信道参数取值表

L	$E\left[ {\alpha _l^2} \right]$	${\tau _l}$
L=2	1/2, 1/2	0, 1
L=3	1/3, 1/3, 1/3	0, 1, 2
L=4	1/4, 1/4, 1/4, 1/4	0, 1, 2, 3
L=5	1/5, 1/5, 1/5, 1/5, 1/5	0, 1, 2, 3, 4

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