摘要
为实现对基于加权分数阶傅里叶变换的混合载波信号的检测识别,提出一种基于高阶累积量与自适应减法聚类的联合调制识别算法。通过合理选择|C_(42)|判决门限来实现对3类传统基带调制类型的初步识别与星座预映射;采用一种基于信道加性高斯白噪声的功率自适应减法聚类半径选取方法,推导出原始基带星座大小。仿真结果表明,基于|C_(42)|优化理论可实现WFRFT调制阶数恢复及基带调制类型初步判决;所设计自适应半径聚类算法较传统固定半径设计具有更优异的基带星座大小识别性能。
In order to detect and recognize the weighted-type fractional fourier transform(WFRFT)-based hybrid carrier signals,a combinatory modulation recognition method was provided based on higher order cumulants and adaptive subtractive cluster algorithm.First,as for the three traditional baseband modulations,the initial recognition and corresponding constellation mapping were implemented by properly selecting the thresholds for |C_(42)|.Besides,the adaptive subtractive radius was decided on the additive Gaussian white noise’s power.Finally,by utilizing soft-decision subtractive cluster,the corresponding constellation size could be inferred for the baseband modulations.Simulation results showed that the WFRFT order can be well recovered and the baseband modulation types can also be decided initially based on |C_(42)|;the proposed adaptive-radius subtractive cluster can obtain better recognition performances with regards to baseband constellation’s size compared to the traditional fixed-radius design.
作者
梁源
向新
王瑞
刘坤
尹立言
王鹏
LIANG Yuan;XIANG Xin;WANG Rui;LIU Kun;YIN Liyan;WANG Peng(Aeronautics Engineering College,Air Force Engineering University,Xi’an 710038,China;Graduate School,Air Force Engineering University,Xi’an 710051,China)
出处
《弹箭与制导学报》
北大核心
2021年第6期33-38,共6页
Journal of Projectiles,Rockets,Missiles and Guidance
关键词
调制识别
加权分数阶傅里叶变换
高阶累积量
自适应减法聚类
基带星座
modulation recognition
weighted-type fractional Fourier transform
higher order cumulants
adaptive subtractive cluster algorithm
baseband constellation
作者简介
梁源(1989—),男,湖南常德人,讲师,研究方向:变换域通信、信号处理、智能算法。
