隐蔽通信中MP-WFRFT系统星座预编码设计  

Design of constellation precoding in MP-WFRFT based system for covert communications

作　　者：梁源[1] 达新宇[1] 徐瑞阳[1] 倪磊 Liang Yuan Da Xinyu Xu Ruiyang Ni Lei(Information and Navigation Institute, Air Force Engineering University, Xi＇an 710077, Chin)

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2期72-78,共7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(61271250,61571460)

摘　　要：为提高通信系统的隐蔽性能,提出了基于多参加权分数阶傅里叶变换（MP-WFRFT）通信系统的预编码设计方案.通过对MP-WFRFT信号的时域、频域分量定量分析,推导出MP-WFRFT星座的模糊、裂变规律;搭建了基于MP-WFRFT的星座预编码优化系统,并采用遗传算法（GA）进行相关模型优化求解.仿真结果表明：通过星座预编码参数的合理设计,MP-WFRFT系统能够从低概率检测、低概率调制识别、低概率参数截获三个方面不同程度地提升系统的隐蔽性能.确保了合法通信双方的通信安全,使之能够运用到隐蔽通信设计之中.A constellation precoding scheme was proposed based on multiple parameters weighted fractional Fourier transform（MP-WFRFT） to improve the communication system？s concealment.Through quantitative analysis about the MP-WRRFT signal？s time-domain and frequency-domain parts, the MP-WFRFT constellation ？ s blurring and splitting rules were deduced. The constellation precoding system was also built based on MP-WFRFT, and genetic algorithm（GA） was adopted to solve the corresponding optimization program.Simulation results show that when the parameters in the constellation precoding system based on MP-WFRFT are set properly,the system can help improve the system？s concealment in the following aspects：low probability detection（LPD）,low probability modulation recognition（LPMR）,and low probability parameter interception（LPPI）,which can guarantee the legitimate communications？ security and be applied into the covert communications.

关 键 词：隐蔽通信 多参加权分数阶傅里叶变换 星座预编码 遗传优化 抗截获 

分 类 号：TN914[电子电信—通信与信息系统]