Security and Angle-Frequency Coupling in Terahertz WLANs
Security and Angle-Frequency Coupling in Terahertz WLANs
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DOI：
10.1109/tnet.2023.3321641
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发表时间：
2024-04
期刊：
影响因子：
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通讯作者：
Chia-Yi Yeh;Yasaman Ghasempour;Yasith Amarasinghe;D. M. Mittleman;E. Knightly
中科院分区：
文献类型：
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作者：
Chia-Yi Yeh;Yasaman Ghasempour;Yasith Amarasinghe;D. M. Mittleman;E. Knightly
本文提出了第一个太赫兹网络的安全性研究，采用天线的角频耦合特性。以漏波天线（LWA）为代表，我们探讨了独特的安全性能，由于频率相关的辐射。我们通过分析模型和空中实验表明，LWA链路在子信道上表现出非均匀的保密能力，在边缘频率处产生窃听优势。然而，由于不同的频率朝向不同的角度发射，窃听者被阻止容易地截取整个宽带传输。实验偏离的分析模型，该模型低估了窃听者的优势，在小于目标用户的角度和随后的不对称性能的角度。尽管如此，模型和测量结果都表明，越来越宽的带宽和相应的宽波束只有适度的边际安全损失。此外，我们发现LWA链路的保密性不仅取决于目标用户的角度（由于LWA的频率-角度耦合的非线性），但也构成集体LWA传输的频率分量的波束宽度。
This paper presents the first security study of THz networks employing antennas with the angle-frequency coupling property. Using Leaky Wave Antennas (LWAs) as a representative, we explore the unique security properties due to the frequency-dependent radiation. We show via both analytical models and over-the-air experiments that LWA links exhibit non-uniform secrecy capacity across sub-channels, yielding advantages to an eavesdropper at edge frequencies. Yet, because different frequencies emit towards different angles, the eavesdropper is thwarted from easily intercepting an entire wideband transmission. The experiments diverge from the analytical model in that the model underpredicts the eavesdropper’s advantage at angles smaller than the target user and subsequent asymmetric performance across angles. Nonetheless, both the model and measurements show that increasingly wide bandwidth and correspondingly wide beams have only a modest marginal security penalty. Further, we find the LWA link secrecy not only depends on the target user angle (due to nonlinearity of LWA’s frequency-angle coupling), but also the beamwidth of the frequency components that constitute the collective LWA transmission.