干扰不确定性下AWGN信道和THz波段的隐藏通信
Hiding Communications in AWGN Channels and THz Band with Interference Uncertainty
摘要：
隐蔽通信可以防止对手知道无线传输已经发生。在加性高斯白噪声（AWGN）信道中，发现了Alice在$n$信道中能够可靠地、隐蔽地向Bob发送$\mathcal{O}(\sqrt{n})$比特的平方根规律.在本文中，我们考虑在嘈杂的无线网络中的隐蔽通信，其中接收器不仅经历的背景噪声，但也从其他发射器的聚合干扰。我们的研究结果表明，不确定性的干扰所经历的对手威利是有益的爱丽丝。在AWGN信道中，当Alice和Willie之间的距离为$d_{a,w}=ω(n^{1/(2α)})$（$α$为路径损耗指数）时，Alice可以在$n$信道使用中向Bob可靠且隐蔽地发送$\mathcal{O}(\log_2\sqrt{n})$比特。虽然隐蔽吞吐量低于平方根定律，但空间吞吐量较高。在太赫兹（THz）频段网络中，隐蔽通信更加困难，因为威利可以简单地将接收器放置在爱丽丝和鲍勃之间的窄波束中，以检测或阻止他们的LOS（视线）通信。然后，我们提出了一个隐蔽的通信方案，利用反射或漫散射从粗糙表面，以防止被威利检测到。从网络的角度来看，通信隐藏在嘈杂的无线网络的干扰中，威利看到的只是一个“影子”无线网络。
英文摘要：
Covert communication can prevent an adversary from knowing that a wireless transmission has occurred. In additive white Gaussian noise (AWGN) channels, a square root law is found that Alice can reliably and covertly transmit $\mathcal{O}(\sqrt{n})$ bits to Bob in $n$ channel uses. In this paper, we consider covert communications in noisy wireless networks, where the receivers not only experience the background noise, but also the aggregate interference from other transmitters. Our results show that uncertainty in interference experienced by the adversary Willie is beneficial to Alice. In AWGN channels, when the distance between Alice and Willie $d_{a,w}=ω(n^{1/(2α)})$ ($α$ is the path loss exponent), Alice can reliably and covertly transmit $\mathcal{O}(\log_2\sqrt{n})$ bits to Bob in $n$ channel uses. Although the covert throughput is lower than the square root law, the spatial throughput is higher. In THz (Terahertz) Band networks,covert communication is more difficult because Willie can simply place a receiver in the narrow beam between Alice and Bob to detect or block their LOS (Line-of-Sight) communications. We then present a covert communication scheme that utilizes the reflection or diffuse scattering from a rough surface to prevent being detected by Willie. From the network perspective, the communications are hidden in the interference of noisy wireless networks, and what Willie sees is merely a "shadow" wireless network.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
