双频段可重构智能表面（DBRIS）的系统级增益：从无线通信到无线携能通信（SWIPT）
System-Level Gains of Dual-Band RIS: From Wireless Communication to SWIPT
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中文总结 AI 辅助
本文研究双频段可重构智能表面（DBRIS）在无线通信和无线携能通信（SWIPT）中的系统级增益，提出交替优化方法最大化能量效率，数值验证其相比单频段RIS的能效优势。
中文摘要 AI 辅助
本文介绍了将双频段可重构智能表面（DBRIS）集成到无线系统设计中，并研究了在不同应用场景下由此带来的性能增益。与单频段RIS相比，这类超表面因其减少的材料使用、紧凑的设计以及跨多个频段的多功能操作而成为一种引人注目的技术。本文考虑了两个代表性用例来评估上述集成所带来的性能增益，即DBRIS辅助的无线通信和DBRIS辅助的同步无线信息与能量传输（SWIPT）。对于第一个设计，其中DBRIS作为中继部署，我们关注通信系统的能量效率（EE）最大化。提出了一种交替流形方法，用于联合优化源发射功率和DBRIS相移。对于第二个设计，我们研究了一种使用新颖功率分配方法的DBRIS辅助SWIPT系统。定义了一个EE指标，并开发了一种交替优化算法来最大化该指标。数值结果验证了所提出的设计架构以及所提出的优化框架的优势。特别地，我们强调了在这两种应用场景中，与使用传统单频表面相比，DBRIS所带来的能量效率增益。
英文摘要
This paper introduces the integration of dual-band reconfigurable intelligent surfaces (DBRIS) in wireless system design, and investigates the ensuing performance gains in different application scenarios. This type of metasurfaces offers a compelling technology due to their reduced material usage, compact design, and multi-functional operation across multiple frequency bands compared to single-band RISs. Two representative use cases are considered to assess the achievable performance gains with the said integration, namely, DBRIS-assisted wireless communication, and DBRIS-assisted simultaneous wireless information and power transfer (SWIPT). For the first design, where the DBRIS is deployed as a relay, we focus on the energy efficiency (EE) maximization of the communication system. An alternating manifold method is proposed for the joint optimization of the source transmit power and the DBRIS phase shifting. For the second design, we investigate a DBRIS-assisted SWIPT system using a novel power splitting approach. An EE metric is defined, and an alternating optimization algorithm is developed to maximize it. Numerical results validate the advantages of the proposed design architectures as well as the proposed optimization framework. In particular, we highlight the energy efficiency gains enabled by the DBRIS as compared to operations with conventional single-frequency surfaces, in both application scenarios.
发表机构
- Institut National de la Recherche Scientifique（国家科学研究研究所）
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