标题： 下行捏合天线系统的速率最大化 显示英文标题

标题： Rate Maximization for Downlink Pinching-Antenna Systems

摘要： 在本信中，我们考虑一种新型的柔性天线系统，称为夹持天线，其中多个低成本的夹持天线，通过在介质波导上激活小的介电粒子实现，被联合用于服务单天线用户。 我们的目标是通过优化夹持天线的位置来最大化下行链路传输速率。 然而，这些位置同时影响用户的有效信道增益的路径损耗和相位偏移，使得该问题难以解决。 为了解决这一挑战并以低复杂度的方式解决问题，开发了一个松弛优化问题，该问题最小化路径损耗的影响，同时确保用户接收到的信号是建设性的。 这种方法导致了一个两阶段算法：在第一阶段，优化夹持天线的位置以最小化大尺度路径损耗；在第二阶段，优化天线位置以最大化接收到的信号强度。 仿真结果表明，夹持天线系统显著优于传统的固定位置天线系统，所提出的算法实现了与高度复杂的穷举搜索基准几乎相同的表现。 显示英文摘要

摘要： In this letter, we consider a new type of flexible-antenna system, termed pinching-antenna, where multiple low-cost pinching antennas, realized by activating small dielectric particles on a dielectric waveguide, are jointly used to serve a single-antenna user. Our goal is to maximize the downlink transmission rate by optimizing the locations of the pinching antennas. However, these locations affect both the path losses and the phase shifts of the user's effective channel gain, making the problem challenging to solve. To address this challenge and solve the problem in a low complexity manner, a relaxed optimization problem is developed that minimizes the impact of path loss while ensuring that the received signals at the user are constructive. This approach leads to a two-stage algorithm: in the first stage, the locations of the pinching antennas are optimized to minimize the large-scale path loss; in the second stage, the antenna locations are refined to maximize the received signal strength. Simulation results show that pinching-antenna systems significantly outperform conventional fixed-location antenna systems, and the proposed algorithm achieves nearly the same performance as the highly complex exhaustive search-based benchmark.