发表机构
National Mobile Communications Research Laboratory, Southeast University（东南大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
针对均匀球面阵列全阵列传输激活过多低贡献单元的问题，提出一种自适应单元激活策略，通过按角度构建候选序列并迭代选择最大改善速率缺口的连接，在满足用户速率需求下大幅降低激活单元比例。
AI 中文摘要
均匀球面阵列提供全空间覆盖。然而，由于方向性单元方向图，全阵列传输会激活许多对给定用户贡献很小的单元，导致系统开销增加和功率分配效率低下。为解决此问题，本文提出一种用于多用户均匀球面阵列的自适应单元激活策略，该策略在满足各用户速率要求的同时减少物理激活单元的数量。所提策略根据每个单元波束指向与用户方向之间的夹角构建用户特定的候选序列。在每次迭代中，它从不满足的用户中选择能最大程度改善总速率缺口的用户-单元连接。仿真结果表明，对于单个用户，少于一半的单元即可实现其全阵列速率的80%，而在多用户场景中，少于70%的单元即可实现所有用户的全阵列速率。此外，在所有测试配置中，所提策略所需的激活单元比例始终低于基线方法。
英文摘要
Uniform spherical arrays provide full-space coverage. However, owing to directional element patterns, full-array transmission activates many elements that contribute little to a given user, resulting in increased system overhead and inefficient power allocation. To address this issue, this letter proposes an adaptive element activation strategy for multiuser uniform spherical arrays that reduces the number of physically active elements while satisfying individual user rate requirements. The proposed strategy constructs a user-specific candidate sequence according to the angle between each element boresight and the user direction. At each iteration, it selects, among the unsatisfied users, the user-element connection that provides the largest improvement in the aggregate rate deficit. Simulation results show that fewer than half of the elements are sufficient for a single user to achieve 80% of its full-array rate, while fewer than 70% are sufficient to achieve the full-array rates of all users in multiuser scenarios. Moreover, the proposed strategy consistently requires a lower active-element ratio than the baseline methods across all tested configurations.
