Existing physical-layer authentication (PLA) schemes of tag superimposed on message signals (TSM) can achieve high authentication accuracy at the cost of increased latency and reduced communication performance. The schemes of tag superimposed on pilot signals (TSP) achieve desirable communication performance and low latency, but low randomness of the tag results in lower security. To further improve both security and communication performance, we propose a pseudo random watermark hopping-based PLA scheme in this article. The proposed scheme generates a pseudo-random sequence and designs a watermark hopping mechanism, which superimposes a carefully designed tag on the pilot or message signals accordingly. The proposed scheme enhances the security by utilizing the randomness from both tag generation and watermark hopping mechanism. Meanwhile, it decreases the authentication latency and improves the communication performance by superimposing the tag on the pilot signals without the message recovery process before authentication. The theoretical and experimental results demonstrate that the proposed scheme decreases the bit error rate (BER) and outage probability as well as increases the achievable rate of the system compared with the TSM scheme with the same key equivocation. Moreover, the security performance of our scheme is significantly improved compared with both TSM and TSP schemes.

中文翻译：

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通过随机水印跳跃增强物理层身份验证


现有的物理层身份验证 （PLA） 方案的标签叠加在消息信号 （TSM） 上，可以以增加延迟和降低通信性能为代价实现高身份验证准确性。标签叠加在导频信号 （TSP） 上的方案实现了理想的通信性能和低延迟，但标签的低随机性导致安全性较低。为了进一步提高安全性和通信性能，我们在本文中提出了一种基于伪随机水印跳跃的 PLA 方案。该方案生成伪随机序列，设计水印跳跃机制，将精心设计的标签相应地叠加在导频或消息信号上。所提出的方案通过利用标签生成和水印跳跃机制的随机性增强了安全性。同时，通过在鉴权前将标签叠加在 Pilot 信号上，无需进行消息恢复过程，从而降低了鉴权延迟，提高了通信性能。理论和实验结果表明，与具有相同键模棱两可的TSM方案相比，所提方案降低了误码率（BER）和中断概率，提高了系统的可实现率。此外，与 TSM 和 TSP 方案相比，我们方案的安全性能得到了显著提高。