Title: Pinching Antenna Systems (PASS) for Cell-Free Communications Show Chinese title

Title: 无蜂窝通信的夹紧天线系统

Abstract: A pinching antenna system (PASS) assisted cell-free communication system is proposed. A sum rate maximization problem under the BS power budget constraint and PA deployment constraint is formulated. To tackle the proposed non-convex optimization problem, an alternating optimization (AO) algorithm is developed. In particular, the digital beamforming sub-problem is solved using the weighted minimum mean square error (WMMSE) method, whereas the pinching beamforming sub-problem is handled via a penalty based approach combined with element-wise optimization. Simulation results demonstrate that: 1) the PASS assisted cell-free systems achieve superior performance over benchmark schemes; 2) increasing the number of PAs per waveguides can improve the advantage of PASS assisted cell-free systems; and 3) the cell-free architecture mitigates the average user rate degradation as the number of users increases. Show Chinese abstract

Abstract: 一种基于夹钳天线系统（PASS）的无基站通信系统被提出。 在基站功率预算约束和功率放大器部署约束下，建立了总速率最大化问题。 为解决所提出的非凸优化问题，开发了一种交替优化（AO）算法。 具体而言，数字波束成形子问题通过加权最小均方误差（WMMSE）方法求解，而夹钳波束成形子问题则通过结合惩罚方法和逐元素优化的方法处理。 仿真结果表明：1）基于PASS的无基站系统在基准方案中表现出更优的性能；2）每根波导上增加功率放大器的数量可以提升基于PASS的无基站系统的优势；3）随着用户数量的增加，无基站架构能够缓解平均用户速率的下降。