极大规模动态超表面天线的近场波束跟踪
Near-Field Beam Tracking with Extremely Large Dynamic Metasurface Antennas
AI总结：
针对动态超表面天线架构下的近场通信，提出一种基于波束成形增益阈值触发的近场波束跟踪框架，推导了波束聚焦相关性与用户移动影响的解析表达式，并设计非均匀坐标网格进行采样，仿真验证其优于基准方法。
摘要：
未来无线网络中大孔径天线与高频的相互作用将催生近场通信。本文聚焦动态超表面天线的混合模拟与数字波束成形架构，该架构是近期实现极大规模天线架构的重要使能技术，并提出一种近场波束跟踪框架：仅在基站估计其提供的波束成形增益低于理论最优值一定阈值时，才启动近场波束扫描。本文提出了新的解析表达式，涵盖任意两个波束聚焦向量间的相关函数、用户坐标失配下的波束成形增益、导致波束成形增益下降最快的用户移动方向，以及达到特定性能损失所需的最小用户位移。我们还设计了一种非均匀坐标网格，用于在每个位置估计时隙有效采样用户感兴趣区域。大量仿真结果验证了理论分析，并展示了所提近场波束跟踪相对于基准的优越性。
英文摘要：
The interplay between large antenna apertures and high frequencies in future generations of wireless networks will give rise to near-field communications. In this paper, we focus on the hybrid analog and digital beamforming architecture of dynamic metasurface antennas, which constitutes a recent prominent enabler of extremely massive antenna architectures, and devise a near-field beam tracking framework that initiates near-field beam sweeping only when the base station estimates that its provided beamforming gain drops below a threshold from its theoretically optimum value. Novel analytical expressions for the correlation function between any two beam focusing vectors, the beamforming gain with respect to user coordinate mismatch, the direction of the user movement yielding the fastest beamforming gain deterioration, and the minimum user displacement for a certain performance loss are presented. We also design a non-uniform coordinate grid for effectively sampling the user area of interest at each position estimation slot. Our extensive simulation results validate our theoretical analysis and showcase the superiority of the proposed near-field beam tracking over benchmarks.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
