太赫兹科学与电子信息学报2025，Vol.23Issue(11)：1183-1192,10.DOI:10.11805/TKYDA2024242
基于星座图和连续相位差的高阶QAM信号识别
Signal identification of higher-order QAM based on constellation diagram and continuous phase difference
摘要
Abstract
Constellation diagram,as a key feature for modulation recognition,offers distinct advantages in the field of signal classification.To address the difficulty of clustering constellation diagrams under low Signal-to-Noise Ratio(SNR)conditions,a high-order Quadrature Amplitude Modulation(QAM)identification method is proposed based on the continuous phase difference of constellation points.Exploiting the symmetry of the diagram,the constellation is first divided into quadrants;then,employing K-medoids clustering,the continuous phase difference of each cluster center is computed.The modulation type is finally determined from the range of these phase differences.The approach requires no prior knowledge of the signal,needs no threshold training,and features simple parameter extraction and low computational complexity.Simulation results show that the proposed algorithm outperforms subtraction-clustering and ordering-based clustering structure recognition,namely Ordering Points To Identify the Clustering Structure(OPTICS);when the SNR exceeds 15 dB,the recognition accuracy surpasses 90%.关键词
正交幅度调制(QAM)/星座图/连续相位差/K‒medoids聚类Key words
Quadrature Amplitude Modulation(QAM)/constellation diagram/continuous phase difference/K‒medoids clustering分类
信息技术与安全科学引用本文复制引用
叶枝,何星星,王溪..基于星座图和连续相位差的高阶QAM信号识别[J].太赫兹科学与电子信息学报,2025,23(11):1183-1192,10.基金项目
中央高校基本科研业务费专项资金资助项目(2682024ZTPY041) （2682024ZTPY041）
四川省科技计划资助项目(2023YFH0066) （2023YFH0066）
