| 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。 |
| 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 |
| DOI：10.20079/j.issn.1001-893x.220915003 |
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| 基金项目: |
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| A Cross-layer Design Method for LPI Waveform Based on Weighted Fractional Fourier Transform |
| NI Dadong,DU Junyi,WU Yuansheng,XIAO Lei,YANG Peitong |
| ((Southwest China Institute of Electronic Technology,Chengdu 610036,China)) |
| Abstract: |
| 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. |
| Key words: covert communication system LPI waveform anti-modulation recognition weighted fractional Fourier transform(WFRFT) cross-layer design |
