基于高阶累积量和信号平方谱特征的复合调制信号盲识别

doi:10.12263/DZXB.20201287

电子学报 ›› 2022, Vol. 50 ›› Issue (2): 426-431.DOI: 10.12263/DZXB.20201287

基于高阶累积量和信号平方谱特征的复合调制信号盲识别

许琦敏¹, 万峻², 何羚¹^,³, 王茜¹^,³

^1.电子科技大学航空航天学院, 四川成都 611731
^2.国家无线电监测中心成都监测站, 四川成都 611136
^3.飞行器集群智能感知与协同控制四川省重点实验室, 四川成都 611731

收稿日期:2020-11-17 修回日期:2021-04-11 出版日期:2022-02-25
- 作者简介:
- 许琦敏女，1997年出生，四川遂宁人.电子科技大学在读硕士研究生.主要研究方向为空间信息处理.E-mail: xuqimin_l@163.com
  万峻女，1972年出生，四川成都人.任职于国家无线电监测中心成都监测站，高级工程师，长期从事无线电监测工作.主要研究方向为无线电监测、信息技术.E-mail: wanjun@srrc.org.cn
  何羚（通讯作者）女，1972年出生，江苏镇江人.电子科技大学航空航天学院副教授.主要研究方向为空间电磁态势感知、信号与信息处理、频域测试.E-mail: heling@uestc.edu.cn
  王茜女，1984年出生，四川成都人.电子科技大学副教授.主要研究方向为信号检测、通信信号测试、数字信号处理.E-mail: job_wangqian@uestc.edu.cn
- 基金资助:
- 国家自然科学基金 (61801093)

Blind Recognition for Hybrid Modulation Signals Based on High-order Cumulant and Squared Spectrum Feature

XU Qi-min¹, WAN Jun², HE Ling¹^,³, WANG Qian¹^,³

^1.School of Aeronautics and Astronautics, University of Electronic and Technology of China, Chengdu, Sichuan 611731, China
^2.Chengdu Monitoring Station of The State Radio Monitoring Center, Chengdu, Sichuan 611136, China
^3.Aircraft Swarm Intelligent Sensing and Cooperative Control Key Laboratory of Sichuan Province, Chengdu, Sichuan 611731, China

Received:2020-11-17 Revised:2021-04-11 Online:2022-02-25 Published:2022-02-25
- Supported by:
- National Natural Science Foundation of China (61801093)

摘要/Abstract

摘要：

针对符合CCSDS（Consultative Committee for Space Data Systems，国际空间数据系统咨询委员会）标准的多种复合调制体制测控信号，本文在建立8类典型调制信号数学模型的基础上，分析了信号的频域和统计域特征，并基于高阶累积量和信号平方谱提取了4个特征参数.根据所提的特征参数，针对复合调制信号提出了一种基于特征提取的直接识别方法，给出了具体的识别流程，并在11种信噪比下对该识别方法进行了MATLAB仿真实验.仿真结果表明在2 dB信噪比条件下，8类信号的识别率均达到98%，证明了所提复合调制盲识别方法的有效性.

关键词: 复合调制, 高阶累积量, 平方谱特征, 调制盲识别

Abstract:

Aiming at multi-type hybrid modulation TT&C(telemetry, track and command) signals that comply with CCSDS(consultative committee for space data systems) standards, this paper analyzes the frequency domain and statistical domain characteristics of the signals on the basis of establishing eight types of typical modulation signal mathematical models, and four characteristic parameters are extracted based on the high-order cumulant and the squared spectrum of the signal. According to the proposed characteristic parameters, a direct identification method based on feature extraction is proposed for the multi-type hybrid modulation. The specific recognition process is given in the paper, and MATLAB simulation experiments are carried out on this recognition method under 11 signal-to-noise ratios. The simulation results show that under the condition of 2 dB signal-to-noise ratio, the recognition rates of 8 types of signals reach 98%, which proves the effectiveness of the proposed hybrid modulation blind recognition method.

Key words: hybrid modulation, high-order cumulant, squared spectrum feature, modulation blind recognition

中图分类号:

TN911.6

许琦敏, 万峻, 何羚, 王茜. 基于高阶累积量和信号平方谱特征的复合调制信号盲识别[J]. 电子学报, 2022, 50(2): 426-431.

XU Qi-min, WAN Jun, HE Ling, WANG Qian. Blind Recognition for Hybrid Modulation Signals Based on High-order Cumulant and Squared Spectrum Feature[J]. Acta Electronica Sinica, 2022, 50(2): 426-431.

图/表 8

图1 标准码型的基带信号产生流程

表1 仿真参数

载波频率	70 MHz
副载波频率1	20 KHz
副载波频率2	40 KHz
码速率	1 Mbit/s
观测信号的长度	4 096

表2 各类信号C40和C42的理想值

复合调制信号类型	$C 40$	$C 42$
PCM/BPSK	0.013	0.995
PCM/QPSK	0.019	0.995
PCM/UQPSK	0.001	0.067
PCM/BPSK/PM	0.226 7	0.924 3
PCM/QPSK/PM	0.117 7	0.961 3
PCM/BPSK/QPSK/PM	0.393 8	0.868 7
PCM/QPSK/QPSK/PM	0.430 8	0.856 6
PCM/BPSK/BPSK/PM	0.769 1	0.742 9

表2 各类信号C40和C42的理想值

复合调制信号类型	$C 40$	$C 42$
PCM/BPSK	0.013	0.995
PCM/QPSK	0.019	0.995
PCM/UQPSK	0.001	0.067
PCM/BPSK/PM	0.226 7	0.924 3
PCM/QPSK/PM	0.117 7	0.961 3
PCM/BPSK/QPSK/PM	0.393 8	0.868 7
PCM/QPSK/QPSK/PM	0.430 8	0.856 6
PCM/BPSK/BPSK/PM	0.769 1	0.742 9

表3 C42?/?C40的理想值

复合调制信号类型	$C 42 / C 40$
PCM/QPSK/QPSK/PM	1.988
PCM/BPSK/QPSK/PM	2.208

表3 C42?/?C40的理想值

复合调制信号类型	$C 42 / C 40$
PCM/QPSK/QPSK/PM	1.988
PCM/BPSK/QPSK/PM	2.208

图2 特征参数P随信噪比的变化曲线

图3 复合调制信号盲识别流程

表4 识别流程的门限取值

th1	th2	th3	th4	th5	th6	th7
0.1	0.5	0.79	0.68	0.32	0.205	2.13

图4 信号在不同信噪比下的识别率

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基于高阶累积量和信号平方谱特征的复合调制信号盲识别

Blind Recognition for Hybrid Modulation Signals Based on High-order Cumulant and Squared Spectrum Feature

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