吉林大学学报(工学版) ›› 2024, Vol. 54 ›› Issue (11): 3392-3398.doi: 10.13229/j.cnki.jdxbgxb.20230869

• 通信与控制工程 • 上一篇    

低信噪比下短波数字信号调制识别算法

郑礼1,2(),闫光辉1(),严天峰1,2   

  1. 1.兰州交通大学 电子与信息工程学院，兰州 730070
    2.甘肃省无线电监测及定位行业技术中心，兰州 730070
  • 收稿日期:2023-08-16 出版日期:2024-11-01 发布日期:2025-04-24
  • 通讯作者: 闫光辉 E-mail:zhengli3227@163.com;ghyan@mail.lzjtu.cn
  • 作者简介:郑礼（1989-），男，讲师，博士.研究方向：软件无线电，智能频频认知与机器学习.E-mail：zhengli3227@163.com
  • 基金资助:
    国家自然科学基金项目(62062049);中央指导性地方科技发展基金项目(22ZY1QA005);甘肃省重大科技专项项目(22ZD6GA041);兰州交通大学青年科学基金项目(2023009)

Modulation recognition algorithm for shortwave digital signals under low signal-to-noise ratio

Li ZHENG1,2(),Guang-hui YAN1(),Tian-feng YAN1,2   

  1. 1.School of Electronics and Information Engineering，Lanzhou Jiaotong University，Lanzhou 730070，China
    2.Gansu Province Radio Monitoring and Positioning Industry Technology Center，Lanzhou 730070，China
  • Received:2023-08-16 Online:2024-11-01 Published:2025-04-24
  • Contact: Guang-hui YAN E-mail:zhengli3227@163.com;ghyan@mail.lzjtu.cn

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摘要：

针对信道存在噪声的干扰，为了更好地获取短波数字信号，提出了低信噪比下短波数字信号调制识别算法，构建需要识别的短波数字信号模型，采集发射信号，获得脉冲噪声、高斯噪声、码间串扰信号。利用瞬时数值算出滚降和匹配滤波器的振幅频率响应，结合相位校正，抑制噪声影响。小波滤波技术通过优化瞬时信息，求出瞬时振幅、瞬时相位、瞬时频率绝对值的平均数，完成短波数字信号调制识别。通过实验，证明本文算法能有效完成数字信号调制识别，噪声影响较小，准确性高。

关键词: 低信噪比, 短波数字信号, 信号调制识别, 瞬时频率, 特征参量

Abstract:

In order to better obtain shortwave digital signals due to noise interference in the channel， a modulation recognition algorithm for shortwave digital signals under low signal-to-noise ratio is proposed. The short wave digital signal model to be identified is constructed， and the transmitted signals are collected to obtain pulse noise， Gaussian noise， and intersymbol interference signals. The roll off and the amplitude frequency response of the Matched filter are calculated using instantaneous values， and the noise effect is suppressed by combining phase correction. The instantaneous information is optimized by wavelet filtering technology， and the average of instantaneous amplitude， instantaneous phase and Instantaneous phase and frequency absolute value is calculated to complete modulation recognition of short wave digital signal. Through experiments， it has been proven that the proposed algorithm can effectively achieve digital signal modulation recognition with minimal noise impact and high accuracy.

Key words: low signal-to-noise ratio, short wave digital signal, signal modulation recognition, instantaneous phase and frequency, characteristic parameters

中图分类号: 

  • TN91

图1

短波数字信号调制识别流程"

图2

2ASK信号调制识别"

图3

4ASK信号调制识别"

图4

2FSK信号调制识别"

图5

4FSK信号调制识别"

图6

2PSK信号调制识别"

图7

4PSK信号调制识别"

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