基于干扰的认知混合星地网络的PHY层安全
A PHY Layer Security of a Jamming-Based Underlay Cognitive Hybrid Satellite-Terrestrial Network
摘要：
在这项工作中，我们研究了基于干扰的认知混合卫星-地面网络的物理层安全性{组成}的射频链路在第一跳和光馈线在第二跳。特别地，一个次级用户（SU）通过中继卫星的帮助向光地面站{（$\boldsymbol{D}$）}发送数据，在每一跳处存在{活动的}窃听者。{此外}，位于第一跳的另一个SU充当友好的干扰器，并不断广播无法被窃听器解码的人工噪声，以便积极地影响系统的保密性。由于基本策略，SU正在永久调整其发射功率，以避免对主要用户造成有害干扰。RF信道经历阴影-莱斯和瑞利衰落模型，而光链路经受伽马-伽马{具有指向误差的湍流}。考虑到两种不同的情况下，无论信道的条件，即（i）不存在和（ii）友好干扰机的存在，推导出的封闭形式和渐近表达式的拦截概率（IP）。各种关键参数对IP的影响，例如，{源}发射功率、{人工噪声}、最大容许干扰功率和衰落严重性参数被检查。准确地说，我们的目标是回答以下问题：一个友好的干扰机可以进一步提高这样的系统的安全性，即使在低信噪比制度？所有的推导结果都证实了Monte Carlo模拟和新的见解所考虑的系统的保密性。
英文摘要：
In this work, we investigate the physical layer security of a jamming-based underlay cognitive hybrid satellite-terrestrial network {consisting of a} radio frequency link at the first hop and an optical feeder at the second hop. Particularly, one secondary user (SU) is transmitting data {to an end-user} optical ground station {($\boldsymbol{D}$)} through the aid of a relay satellite, in the presence of {an active} eavesdropper {at} each hop. {Moreover}, another SU located in the first hop is acting as a friendly jammer and continuously broadcasting an artificial noise that cannot be decoded by the wiretapper so as to impinge positively on the system's secrecy. Owing to the underlying strategy, the SUs are permanently adjusting their transmit powers in order to avoid causing harmful interference to primary users. The RF channels undergo shadowed-Rician and Rayleigh fading models, while the optical link is subject to Gamma-Gamma {turbulence with pointing error}. Closed-form and asymptotic expressions for the intercept probability (IP) are derived considering two different scenarios regardless of the channel's conditions, namely (i) absence and (ii) presence of a friendly jammer. The effect of various key parameters on IP, e.g., {sources'} transmit power, {artificial noise}, maximum tolerated interference power, and fading severity parameters are examined. Precisely, we aim to answer the following question: could a friendly jammer further enhance the security of such a system even in a low SNR regime? All the derived results are corroborated by Monte Carlo simulations and new insights into the considered system's secrecy are gained.
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