CAJ | 학술논문

为提高通信的安全性，将多项加权分数傅里叶变换（multi-terms weighted-type fractional Fourier transform，MWFRFT）与变换域通信系统（transform domain communication system，TDCS）相结合，提出一种加权傅里叶变换域通信方法。首先使用 MWFRFT 对原信号进行处理；然后利用混沌序列产生的伪随机相位生成TDCS 基函数；最后将所得信号与基函数调制并用于隐蔽通信。为验证该方法的可行性，对信号的星座变换特性以及相关特性进行了仿真分析，结果表明，MWFRFT 具有较好的星座混淆性，利用混沌映射得到的 TDCS 基函数相关性有所提高，因此，该方法适用于隐蔽通信。
위제고통신적안전성，장다항가권분수부리협변환（multi-terms weighted-type fractional Fourier transform，MWFRFT）여변환역통신계통（transform domain communication system，TDCS）상결합，제출일충가권부리협변환역통신방법。수선사용 MWFRFT 대원신호진행처리；연후이용혼돈서렬산생적위수궤상위생성TDCS 기함수；최후장소득신호여기함수조제병용우은폐통신。위험증해방법적가행성，대신호적성좌변환특성이급상관특성진행료방진분석，결과표명，MWFRFT 구유교호적성좌혼효성，이용혼돈영사득도적 TDCS 기함수상관성유소제고，인차，해방법괄용우은폐통신。
A new method combining the multi-terms weighted-type fractional Fourier transform (MWFR-FT)and the transform domain communication system (TDCS)is put forward to improve the security of commu-nication.Firstly,MWFRFT for sequence is used to process the original signals.Then chaos mapping is used to generate the pseudorandom phases of the basis function in TDCS.Finally,the basis function is modulated by MWFRFT signals in the covert communication.In order to show the accuracy of this method,the transforma-tion of constellation and the correlation performance are simulated and analyzed.The result shows that MWFR-FT has the diffusion and confusion property of constellation,and the new basis function has better correlation performance,so the method is suitable for covert communication.