变换域重叠隐蔽通信系统的隐蔽性度量方法

发布时间：2019-04-26 07:49

【摘要】：提出了一种基于频域加权的均方误差(MSE)感知失真度量方法以评价变换域重叠隐蔽通信系统的隐蔽性能。该方法针对Q因子度量方法应用于变换域重叠隐蔽通信的局限,根据变换域通信系统的基本原理,将信号的感知失真从时域转到频域进行度量,根据不同宿主信号频谱幅值对于叠加的隐蔽信号的感知失真程度不同,以宿主信号频谱幅值的倒数为加权因子,分别对宿主信号各频点的感知失真做加权求和,从而得到系统的感知失真度量结果。仿真结果表明,该方法不仅可以提高系统感知失真能力,与重叠隐蔽通信的基本机理保持一致,符合实际感知效果,而且还统一了系统感知能力与抗干扰能力,可以为隐蔽系统的设计提供有效参考。
[Abstract]:A mean square error (MSE) perceptual distortion measurement method based on frequency domain weighting is proposed to evaluate the covert performance of overlapping covert communication systems in transform domain. In view of the limitation of Q-factor measurement method applied to overlapping covert communication in transform domain, according to the basic principle of communication system in transform domain, the perceptual distortion of signal is transferred from time domain to frequency domain to measure. According to the different sensitivity distortion degree of different host signal spectrum amplitude to the superimposed hidden signal, taking the reciprocal of host signal spectrum amplitude as the weighting factor, the sense distortion of each frequency point of host signal is weighted sum respectively. Thus, the perceptual distortion measurement results of the system are obtained. The simulation results show that the proposed method can not only improve the perceptual distortion ability of the system, keep consistent with the basic mechanism of overlapping covert communication, but also unify the perceptual ability and anti-jamming ability of the system. It can provide an effective reference for the design of covert system.
【作者单位】：空军工程大学信息与导航学院;中国人民解放军94900部队;
【基金】：国家自然科学基金(60972042,61271250,61202490) 空军工程大学信息与导航学院研究生论文创新基金(2011004)资助项目
【分类号】：TN914

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