AI 中文总结
研究用于收缩天线系统的中断受限环境划分多址接入（EDMA），考虑概率性LoS阻塞等因素，制定联合PA部署和功率分配问题，提出基于PGD和SCA的算法，仿真验证设计优越性及算法有效性，相比其他设计有性能提升。
AI 中文摘要
环境划分多址接入（EDMA）已成为一种有前景的多址接入范式，通过动态调整收缩天线（PA）位置来减轻用户间干扰。本文研究了一个考虑概率性视距（LoS）阻塞、随机非视距（NLoS）散射和实际波导内衰减的多用户PA支持的EDMA框架。旨在最大化总信息速率，制定了一个联合PA部署和功率分配问题，受统计速率中断约束、发射功率预算和PA的可行部署区域限制。首先考虑典型的两用户两PA场景，推导中断概率的闭式表达式，接着提出基于低复杂度投影梯度下降（PGD）的算法来解决重新制定的问题。然后将设计扩展到一般多用户多PA场景，通过假设干扰链路为NLoS并应用切尔诺夫界技术推导中断概率的易处理近似值，提出基于逐次凸近似（SCA）的算法来处理产生的非凸问题。仿真验证了所提出的PA支持的EDMA设计的优越性和所提算法的有效性。具体而言，与穷举搜索相比，基于PGD的算法和基于SCA的算法都实现了接近最优的性能。此外，PA支持的EDMA设计比PA支持的和传统时分多址接入设计都有显著的性能提升。
英文摘要
Environment division multiple access (EDMA) has emerged as a promising multiple access paradigm, which mitigates inter-user interference by dynamically adjusting pinching antenna (PA) positions to the underlying propagation environment. This paper investigates a multi-user PA-enabled EDMA framework that accounts for probabilistic line-of-sight (LoS) blockages, random non-LoS (NLoS) scattering, and practical inwaveguide attenuation. With the aim of maximizing the total information rate, we formulate a joint PA deployment and power allocation problem subject to statistical rate outage constraints, the transmit power budget, and the feasible deployment region of PAs. We first consider a canonical two-user two-PA scenario and derive closed-form expressions for the outage probabilities, followed by a low-complexity projected gradient descent (PGD)-based algorithm to address the reformulated problem. Then, we extend our design to the general multi-user multi-PA scenario and derive tractable approximations for the outage probabilities by assuming interfering links to be NLoS and applying the Chernoff bounding technique, where a successive convex approximation (SCA)-based algorithm is proposed to handle the resulting nonconvex problem. Simulations validate the superiority of the proposed PA-enabled EDMA design and the effectiveness of the proposed algorithms. Specifically, both the PGD-based algorithm and the SCA-based algorithm achieve near-optimal performance in comparison with the exhaustive search. Furthermore, the PA-enabled EDMA design yields significant performance gains over both PA-enabled and conventional time division multiple access designs.
