发表机构
Interdisciplinary Centre for Security, Reliability, and Trust (SnT), University of Luxembourg; University of Rome Tor Vergata（卢森堡大学安全、可靠性和信任跨学科中心; 罗马第二大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文为LEO网络中RSMA赋能双基地ISAC建立遍历性能框架，推导速率下界和感知SNR，验证了双基地感知的显著优势及FAS增益特性。
AI 中文摘要
本文针对低地球轨道（LEO）卫星网络中，采用幅度约束的可重构全息表面（RHS）和流体天线系统（FAS）用户，建立了速率分割多址（RSMA）赋能的双基地集成感知与通信（ISAC）的遍历性能框架。通过一个共享的多馈源RHS幅度状态和流特定的馈源域预编码器，实现了基于确定性角度的公共波束和迫零专用参考波束，并显式保留了由此产生的自干扰、泄漏和目标方向增益。针对参考端口和最佳P端口FAS接收，推导了保守的专用和公共速率下界，同时保持了相同端口选择耦合。对于感知，在最近接收器关联和有限目标-接收器保护距离下，获得了闭合形式的平均双基地感知信噪比（SNR），并扩展到角度条件足迹平均和角度调度。蒙特卡洛结果证实了分析速率界的紧致性，并验证了感知表达式。基准测试表明，标量RHS效率模型可能遗漏强方向相关效应，且最近地面接收器双基地感知在N_RHS=16384、LEO高度400-1000公里范围内，相比有利的单基地LEO参考，提供了17.7-25.7 dB的平均SNR优势。FAS增益在散射丰富的环境中最大，而实现的共享状态RHS目标增益不必随孔径大小单调变化。
英文摘要
This paper develops an ergodic performance framework for rate-splitting multiple access (RSMA)-enabled bistatic integrated sensing and communication (ISAC) in a low-Earth-orbit (LEO) satellite network with an amplitude-constrained reconfigurable holographic surface (RHS) and fluid-antenna-system (FAS) users. Deterministic angle-based common and zero-forcing private reference beams are realized through one shared multi-feed RHS amplitude state and stream-specific feed-domain precoders, and the resulting self-, leakage-, and target-direction gains are retained explicitly. Conservative private- and common-rate lower bounds are derived for both reference-port and best-of-$P$ FAS reception while preserving the same-port selection coupling. For sensing, a closed-form average bistatic sensing signal-to-noise ratio (SNR) is obtained under nearest-receiver association and a finite target--receiver guard distance, with extensions to angle-conditioned footprint averaging and angular scheduling. Monte Carlo results confirm the tightness of the analytical rate bounds and validate the sensing expressions. Benchmarks show that scalar RHS-efficiency models can miss strong direction-dependent effects and that nearest-ground-receiver bistatic sensing provides a $17.7$--$25.7$~dB mean SNR advantage over a favorable monostatic LEO reference for $N_{\rm RHS}=16384$ over LEO altitudes of $400$--$1000$~km. FAS gains are largest in scattering-rich regimes, while the realized shared-state RHS target gain need not vary monotonically with aperture size.
