AI 中文总结
研究随机视距阻塞下挤压天线系统（PASS）性能，通过齐次泊松点过程建模障碍物，提出两种阻塞模型，获得中断概率和遍历速率表达式，仿真表明LoS阻塞影响系统性能，PASS在阻塞时性能优于传统天线。
AI 中文摘要
挤压天线系统（PASS）因其能沿波导动态重新配置辐射位置的独特能力，在无线通信中具有巨大潜力。然而，在存在随机视距（LoS）阻塞时，PASS的性能仍是关键挑战，会导致显著衰减甚至通信中断。本文从随机几何角度研究了LoS阻塞下PASS的性能。通过齐次泊松点过程（PPP）对障碍物建模，将其几何尺寸、数量和位置视为随机变量。提出了随机高度和随机半径（RHRR）阻塞模型及确定性高度和确定性半径（DHDR）阻塞模型。得到了中断概率的闭式解析和渐近表达式以及遍历速率的解析和近似表达式。仿真结果表明，更密集的障碍物环境或统计上更大的障碍物会大幅增加LoS阻塞概率并降低系统性能。此外，由于PASS能动态重新定位PA，在存在LoS阻塞时其性能始终优于传统天线系统。
英文摘要
Pinching-antenna systems (PASS) offer considerable potential for wireless communications due to their unique ability to dynamically reconfigure radiation positions along a waveguide. However, the performance of PASS remains a critical challenge in the presence of random line-of-sight (LoS) blockage, leading to significant attenuation and even communication outages. In this paper, the performance of PASS in the presence of LoS blockage is investigated from the perspective of stochastic geometry. Obstacles are modeled through a homogeneous Poisson point process (PPP), where the geometric dimensions, numbers, and positions are treated as random variables. To conduct a concrete characterization of LoS blockage, the random-height-and-random-radius (RHRR) blockage model and the deterministic-height-and-deterministic-radius (DHDR) blockage model are proposed. In particular, closed-form analytical and asymptotic expressions for the outage probability are obtained, along with analytical and approximate expressions for the ergodic rate. Our simulation results reveal that denser obstacle environments or statistically larger obstacles substantially increase the probability of LoS blockage and degrade the system performance. Moreover, owing to its ability to dynamically reposition PAs, PASS can consistently outperform conventional antenna systems in the presence of LoS blockage.
