Specific emitter identification (SEI) designates the unique transmitter of a given signal, using only external feature measurements called the RF fingerprints of the signal. SEI is often used in military and civilian spectrum-management operations. The SEI technique has also been applied to enhance the security of wireless network, such as VHF radio networks, Wi-Fi networks, cognitive radios, and cellular networks. A novel SEI method based on nonlinear dynamical characteristics is proposed in this paper. The method works based on the actual signal's inherent nonlinear dynamical characteristics. The permutation entropy is extracted as the signal's RF fingerprint to identify the unique transmitter. The quadrature phase-shift keying (QPSK) signals from four wireless network cards and differential quadrature phase-shift keying (DQPSK) signals from three digital radios are utilized to evaluate the performance of the method. Experimental results demonstrate that the proposed method is effective. On the other hand, the proposed method is convenient to implement in a PC.

中文翻译：

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基于非线性动力学特性的特定发射器识别

特定发射器识别 (SEI) 指定给定信号的唯一发射器，仅使用称为信号射频指纹的外部特征测量。SEI 通常用于军事和民用频谱管理操作。SEI 技术还被应用于增强无线网络的安全性，例如 VHF 无线电网络、Wi-Fi 网络、认知无线电和蜂窝网络。本文提出了一种基于非线性动力学特性的新型SEI方法。该方法基于实际信号固有的非线性动态特性而工作。置换熵被提取为信号的射频指纹，以识别唯一的发射机。利用来自四个无线网卡的正交相移键控 (QPSK) 信号和来自三个数字无线电的差分正交相移键控 (DQPSK) 信号来评估该方法的性能。实验结果表明所提出的方法是有效的。另一方面，所提出的方法便于在PC中实现。