多层多参数多项加权分数阶傅里叶变换复合调制通信信号设计方法  

Design Method of Multi-layer Multi-Parameter Multi-term Weighted-type FRactional Fourier Transform Composite Modulation Communication Signal

作　　者：杨宇晓 高萍 YANG Yuxiao;GAO Ping(College of Astronautics,Nanjing University of Aeronautics and Astronautics,Nanjing 211100,China)

机构地区：[1]南京航空航天大学航天学院,南京211100

出　　处：《电子与信息学报》2023年第4期1192-1200,共9页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(61701226)。

摘　　要：为提高卫星通信信号的安全性能,该文提出一种多层多参数多项加权分数阶傅里叶变换(MWFRFT)复合调制通信信号设计方法。该方法针对传统多项加权分数阶傅里叶变换单层结构的被扫描威胁,将MWFRFT扩展至不同加权系数的多层结构,降低了系统的被扫描概率。同时,多层多参数MWFRFT(MPMWFRFT)系统通过对控制参数集的优化设计,解决了多层结构下的通信信号调制特征模拟。针对复杂电磁环境场景中的目标寄生信号和窄带信号干扰,引入扩频机制,设计了3层多项加权分数阶傅里叶变换和直接序列扩频复合调制系统(TLMWFRFT-DSSS)。仿真结果表明,该方法在保证较好通信性能的前提下,实现了多层通信信号的调制特征模拟,显著提高了系统的抗扫描性能。In order to improve the safety performance of satellite communication signal,a multi-layer multiparameter Multi-term Weighted-type FRactional Fourier Transform(MWFRFT)composite modulation communication signal design method is proposed in this paper.Considering the scanning threat of traditional term MWFRFT single-layer structure,MWFRFT is extended to multi-layer structure with different weighting coefficients,which reduces the scanned probability of the system.At the same time,the simulation of communication signal modulation characteristics under multi-layer structure is solved by optimizing the set of control parameters of multi-layer Multi-Parameter MWFRFT(MPMWFRFT)system.Considering the target parasitic signal and narrowband signal interference in complex electromagnetic environment scene,the multilayer multi-parameter composite modulation system Three Layer Multinomial Weighted FRactional Fourier Transform and Direct Sequence Spread Spectrum(TL-MWFRFT-DSSS)are designed by introducing the spread spectrum mechanism.Simulation results show that this method realizes the simulation of modulation characteristics of multi-layer communication signals on the premise of ensuring good communication performance,and improves significantly the anti scanning performance of the system.

关 键 词：安全通信 多层多参数 多项加权分数阶傅里叶变换 扩频 

分 类 号：TN918.91[电子电信—通信与信息系统]