一种基于WFRFT的跨层低截获波形设计方法  

A Cross-layer Design Method for LPI Waveform Based on Weighted Fractional Fourier Transform

作　　者：倪大冬 杜俊逸 伍元胜 肖磊 杨佩彤 NI Dadong;DU Junyi;WU Yuansheng;XIAO Lei;YANG Peitong(Southwest China Institute of Electronic Technology,Chengdu 610036,China)

机构地区：[1]中国西南电子技术研究所,成都610036

出　　处：《电讯技术》2023年第12期1958-1964,共7页Telecommunication Engineering

摘　　要：针对变换域隐蔽通信系统,分析了加权分数傅里叶变换(Weighted Fractional Fourier Transform,WFRFT)隐蔽通信系统抗截获性能。理论分析和仿真结果表明多加权项WFRFT隐蔽通信系统存在抗检测和抗调制识别性能边界,当权重项大于4时多加权项WFRFT通信系统低截获性能不会随着加权项的增加而改善。基于此,提出了一种跨层设计的并行WFRFT隐蔽通信系统。首先采用并行多路WFRFT变换思路,从信号维度增加变换参数个数;其次利用跨层设计思想解决当前WFRFT通信系统收发端同步问题,通过接收端地址控制每路WFRFT变换参数,从空间维度增加非合作节点截获识别信号的难度。仿真结果表明,与多参数项WFRFT隐蔽通信系统相比,所提出的跨层并行WFRFT隐蔽通信系统抗检测和抗调制识别能力更加突出。With regard to the covert communication system based on transform domain technique,the anti-interception performance of weighted fractional Fourier transform(WFRFT)communication systems is discussed.Theoretical analysis and simulation results illustrate that the communication system based on WFRFT has actual performance boundary of anti-detection and anti-recognition in which the covert performance remains unchanged as the number of weights is more than 4.In accordance with this problem,a cross-layer and parallel WFRFT covert communication system is proposed.Firstly,a parallel multi-channel WFRFT processing architecture is adopted to effectively increase the number of transformation parameters.Secondly,based on the tack of cross-layer design,the parameters of each WFRFT are controlled by the destination address which can further increase the difficulty in intercepting and recognizing signal for the non-cooperative receivers.The simulation results show that the cross-layer parallel WFRFT covert communication system is superior to the multi-parameter WFRFT covert communication system in terms of anti-detection and anti-modulation recognition.

关 键 词：隐蔽通信系统 低截获波形 抗调制识别 加权分数傅里叶变换(WFRFT) 跨层设计 

分 类 号：TN975[电子电信—信号与信息处理]