标题： 通过HAPS和主动RIS技术融合在总速率与能量效率之间的权衡 显示英文标题

标题： On the Trade-Off Between Sum-Rate and Energy Efficiency through the Convergence of HAPS and Active RIS Technologies

摘要： 本文研究了将主动可重构智能表面（RIS）中继与高空平台站（HAPS）集成，以增强下一代无线系统中非地面网络（NTN）的性能。 尽管之前的研究集中在被动RIS架构上，但由于长距离HAPS链路中的严重路径损耗和双重衰落，主动RIS由于其固有的信号放大能力成为更合适的替代方案。 我们制定了一个总速率最大化问题，以联合优化由基于HAPS的主动RIS辅助通信系统支持的地面用户设备（UE）的功率分配和RIS元件分配。 为了降低功耗和硬件复杂性，还探讨了几种子连接的主动RIS架构。 仿真结果表明，主动RIS配置在服务质量（QoS）方面显著优于被动RIS。 此外，虽然全连接架构实现了最高的吞吐量，但在实际功率限制下，子连接方案表现出更高的能效。 这些发现突显了主动RIS启用的HAPS系统满足超越蜂窝覆盖和绿色网络日益增长需求的潜力。 显示英文摘要

摘要： This paper investigates the integration of active reconfigurable intelligent surfaces (RIS) relay with high-altitude platform stations (HAPS) to enhance non-terrestrial network (NTN) performance in next-generation wireless systems. While prior studies focused on passive RIS architectures, the severe path loss and double fading in long-distance HAPS links make active RIS a more suitable alternative due to its inherent signal amplification capabilities. We formulate a sum-rate maximization problem to jointly optimize power allocation and RIS element assignment for ground user equipments (UEs) supported by a HAPS-based active RIS-assisted communication system. To reduce power consumption and hardware complexity, several sub-connected active RIS architectures are also explored. Simulation results reveal that active RIS configurations significantly outperform passive RIS in terms of quality of service (QoS). Moreover, although fully-connected architectures achieve the highest throughput, sub-connected schemes demonstrate superior energy efficiency under practical power constraints. These findings highlight the potential of active RIS-enabled HAPS systems to meet the growing demands of beyond-cellular coverage and green networking.