联合多层WFRFT与人工噪声的抗截获通信技术  

Anti-interception communication technology combining multi-layers WFRFT and artificial noise

作　　者：达新宇[1] 翟东 梁源[1] 徐瑞阳[1] Da Xinyu;Zhai Dong;Liang Yuan;Xu Ruiyang(Information and Navigation College,Air Force Engineering University,Xi＇an 710077,China)

机构地区：[1]空军工程大学信息与导航学院

出　　处：《华中科技大学学报（自然科学版）》2018年第10期86-91,共6页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(61571460,61271250);博士后创新人才基金资助项目(No.BX201700108)

摘　　要：针对卫星通信安全性不高、易被截获的问题,提出一种多层加权类分数阶傅里叶变换（WFRFT）与人工噪声联合的卫星抗截获通信技术.首先,对WFRFT进行改进,提出多层WFRFT,并用其调制对信号进行加密,同时与多入多出（MIMO）技术相结合,使调制信号具有多个调制阶数而加密性更强;其次,通过在合法信道的零子空间上加入人工噪声来恶化窃听方的信道质量,并对人工噪声功率占比进行了优化设计,使得合法方误码率（BER）性能满足通信需要的同时,能够极大降低窃听方接收性能;最后,通过理论分析和仿真验证,表明采用WFRFT与人工噪声联合的抗截获通信技术,在合法方BER曲线右移小于1 dB时,可使得窃听方BER大于1×10^-2,即基本不能正确解调信号,且此时系统仍具有较高的安全容量.A kind of anti-interception communication technology based on weighted-type fractional Fourier transform（WFRFT） and artificial noise was proposed to improve the safety and anti-interception performance of satellite communication system.Firstly,multi-layer WFRFT was proposed,and the signal was encrypted by its modulation,meanwhile it was combined with multiple input multiple output（MIMO） technology to make the modulation signal have more modulation orders and stronger encryption.Secondly,artificial noise was transmitted in the null space of the legal channel to deteriorate the channel quality of the eavesdropper,and optimized the power ratio of the artificial noise so that the performance of the legitimate square error rate（BER） could meet the need of the communication,while the performance of the eavesdropping party was reduced greatly.Finally,according to the theoretical analysis and simulation experiments,the anti-interception communication technology based on WFRFT and artificial noise could make the BER greater than 1×10^-2 at the eavesdropper when the legitimate BER curve shifts less than 1 dB,which means that the eavesdropper basically could not correctly demodulate the signal,and meanwhile the capacity of the proposed system is still relatively high.

关 键 词：卫星通信 加权类分数阶傅里叶变换 人工噪声 多入多出 抗截获 

分 类 号：TN914.42[电子电信—通信与信息系统]