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A Physical-Layer Security Based on Wireless Steganography Through OFDM and DFT-Precoded OFDM Signals

机译：基于无线隐写技术的OFDM和DFT预编码OFDM信号的物理层安全性

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We propose a physical-layer security approach based on the concept of steganography for IoT networks. Similar to the covert communications, the transmitter (Alice) attempts to send her secret signal to the legitimate receiver (Bob) avoiding being detected by the warden (Willie). Instead of sending the weak signal that is barely detectable by Willie, we hide secret signal in the cover signal that is transmitted over the same channel such that its existence may not be easily detected without any knowledge of prior information. Considering the practical applications to IoT networks, the DFT-precoded OFDM is adopted for the cover signal and conventional OFDM for the secret signal. Through theoretical analysis and corresponding simulations, the detection error probability of Willie is evaluated over an AWGN channel, revealing that judicious selection of cover signal power may increase the detection error probability of Willie and thus improve the covertness.
机译：我们提出了一种基于隐写技术的物联网网络物理层安全方法。与秘密通信类似，发送方（Alice）尝试将其机密信号发送给合法的接收方（Bob），以避免被看守（Willie）检测到。而不是发送几乎不会被Willie检测到的微弱信号，我们将秘密信号隐藏在通过同一信道传输的掩盖信号中，这样就不会在不了解先验信息的情况下不容易检测到它的存在。考虑到物联网网络的实际应用，对覆盖信号采用DFT预编码OFDM，对秘密信号采用常规OFDM。通过理论分析和相应的仿真，对AWGN信道上Willie的检测错误概率进行了评估，揭示了对覆盖信号功率的明智选择可能会增加Willie的检测错误概率，从而提高隐蔽性。

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