关于存在阻塞的动态信道下挤压天线系统（PASS）的性能
On the Performance of Pinching-Antenna Systems (PASS) Under Dynamic Channels with Blockages
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中文总结 AI 辅助
研究存在阻塞的动态信道下挤压天线系统（PASS）性能，采用几何感知阻塞模型联合考虑LoS和NLoS分量建立信道模型，推导相关性能指标的表达式及阻塞区域端点解析表达式与最优PA部署准则，揭示了NLoS散射对PASS性能的影响。
中文摘要 AI 辅助
在实际环境中，挤压天线系统（PASS）的性能受视距（LoS）阻塞的根本影响。本文在现实的、由障碍物引起的阻塞情况下研究PASS，联合考虑LoS和非视距（NLoS）分量，而非依赖LoS信道或概率阻塞模型。采用几何感知阻塞模型，根据障碍物实际位置和几何特征定义波导上的阻塞区域。通过联合考虑波导内衰减和空间传播损耗来建立PASS的信道模型。在瑞利和莱斯衰落信道下研究单PA单UE场景，推导了中断概率的闭式表达式，在瑞利情况下得到了遍历率的闭式表达式，在莱斯情况下得到了完整解析表达式和近似闭式表达式。推导了阻塞区域端点的解析表达式并给出了最优PA的部署准则。仿真结果验证了分析，揭示了：i）NLoS散射对PASS性能有双重影响，在莱斯衰落时可能降低中断性能但提高速率性能；ii）足够强的NLoS散射在存在LoS阻塞时仍能维持通信；iii）最优PA位置由环境几何以及空间传播损耗和波导内衰减之间的相互作用共同决定。
英文摘要
The performance of pinching-antenna systems (PASS) is fundamentally affected by line-of-sight (LoS) blockage in practical environments. In this paper, PASS is investigated under realistic, obstacle-induced blockage by jointly considering the LoS and non-LoS (NLoS) components, rather than relying on a LoS channel or a probabilistic blockage model. A geometry-aware blockage model is adopted, where a blockage region on the waveguide is defined according to the actual locations and geometric features of obstacles, such that a pinching-antenna (PA) located within the blockage region is unable to establish a LoS link to the user equipment (UE). The channel models of PASS are developed by jointly accounting for in-waveguide attenuation and spatial propagation loss. To quantify the impact of channel factors on PASS performance, a single-PA single-UE scenario is studied under Rayleigh and Rician fading channels. Closed-form expressions for the outage probability are derived for both cases. For the ergodic rate, a closed-form expression is obtained in the Rayleigh case, while a complete analytical expression and an approximate closed-form expression are derived in the Rician case. Analytical expressions are derived for the endpoints of the blockage region, and the deployment criteria of optimal PA are provided. Simulation results validate the analysis and reveal that: i) NLoS scattering has a twofold effect on PASS performance, potentially degrading the outage performance while improving the rate performance under Rician fading; ii) Sufficiently strong NLoS scattering can still sustain communication in the presence of LoS blockage; iii) The optimal PA position is jointly determined by the environment geometry and the interplay between spatial propagation loss and in-waveguide attenuation.
