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延迟对齐调制用于安全的ISAC系统

Delay Alignment Modulation for Secure ISAC Systems

Centre for Wireless Innovation (CWI), Queen’s University Belfast(贝尔法斯特女王大学无线创新中心)

Tianyu Lu, Jiajun He, Mohammadali Mohammadi, Michail Matthaiou

AI总结:

本文提出延迟对齐调制用于安全ISAC系统,通过延迟对齐提高信号功率并降低窃听风险,实验显示其在保密频谱效率上优于传统方法。

摘要:

本文介绍了一种用于安全集成感知与通信(ISAC)的延迟对齐调制(DAM)。由于多用户下行链路的广播性质,通信容易受到窃听的威胁。DAM在发射端对每个路径应用受控的符号延迟,以在预期用户处相干地对齐多路径分量,提高接收到的信号功率,同时在窃听者(Eve)处造成延迟错位。为了减轻多路径传播引起的感知退化,我们提出了一种两阶段协议,首先估计角度,然后在抑制多路径干扰后估计直线视距(LoS)路径的延迟。我们推导了目标延迟的保密频谱效率(SSE)和克拉美-罗界限(CRB)。最后,我们开发了一种基于路径的零 forcing(ZF)预编码框架,并在CRB和功率约束下制定了最大最小SSE设计。仿真结果表明,DAM在SSE方面显著优于最强路径(SP)基准,同时满足感知需求,因为合法用户有意的延迟对齐会退化Eve的接收。

英文摘要:

This paper introduces delay-alignment modulation (DAM) for secure integrated sensing and communication (ISAC). Due to the broadcast nature of multi-user downlinks, communications are vulnerable to eavesdropping. DAM applies controlled per-path symbol delays at the transmitter to coherently align the multipath components at the intended user, enhancing the received signal power, while simultaneously creating delay misalignment at the eavesdropper (Eve). To mitigate sensing degradation caused by multipath propagation, we propose a two-stage protocol that first estimates the angle and then the delay of the line-of-sight (LoS) path after suppressing multipath interference. We derive the secrecy spectral efficiency (SSE) and the Cramer-Rao (CRB) of the target delay. Finally, we develop a path-based zero-forcing (ZF) precoding framework and formulate a max-min SSE design under CRB and power constraints. Simulation results show DAM significantly outperforms the strongest-path (SP) benchmark in terms of SSE, while meeting sensing requirements, since intentional delay alignment at legitimate users degrades reception at Eve.

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。

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