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arXiv 2303.06950cs.ITeess.SPmath.IT
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可重构分布式天线与反射面:一种新的无线通信架构

Reconfigurable Distributed Antennas and Reflecting Surface: A New Architecture for Wireless Communications

Chengzhi Ma, Xi Yang, Jintao Wang, Guanghua Yang, Wei Zhang, Shaodan Ma

AI总结:

本文提出可重构分布式天线与反射面(RDARS)架构,通过动态切换连接与反射模式融合DAS和RIS优势,推导遍历可达速率闭式解,并通过256单元原型验证其吞吐量分别比DAS和RIS提升21%和170%。

摘要:

分布式天线系统(DAS)在远程射频单元中采用多个天线阵列,以实现高度定向的传输,并为未来一代网络提供优异的覆盖性能。然而,有源天线阵列的使用导致DAS的硬件成本和功耗显著增加。为解决这些问题,将DAS与可重构智能表面(RIS)集成提供了一种可行的方法,在保持低硬件成本和低功耗的同时确保传输性能。为了从实际考虑出发将RIS的优点融入DAS,本文提出了一种新颖的“可重构分布式天线与反射面(RDARS)”架构。具体而言,基于附加直通状态的设计以及现有的高质量前传链路,RDARS的任意单元都可以被动态编程,通过光纤与基站(BS)连接,并以连接模式作为基站的远程分布式天线来接收或发送信号。此外,RDARS还通过默认将单元配置为无源以执行反射模式,继承了全无源RIS的低成本和低能耗优势。因此,RDARS能够在分布增益和反射增益之间提供灵活的权衡控制,以提升性能。本文分析了RDARS架构下的遍历可达速率,并推导出具有深刻见解的闭式表达式。理论分析和仿真结果证明,RDARS实现了比DAS和RIS更高的可达速率。构建了一个包含256个单元的RDARS原型用于实际实验,结果表明,RDARS辅助系统相比DAS辅助系统和RIS辅助系统分别可实现额外21%和170%的吞吐量提升。

英文摘要:

Distributed Antenna Systems (DASs) employ multiple antenna arrays in remote radio units to achieve highly directional transmission and provide great coverage performance for future-generation networks. However, the utilization of active antenna arrays results in a significant increase in hardware costs and power consumption for DAS. To address these issues, integrating DAS with Reconfigurable Intelligent Surfaces (RIS) offers a viable approach to ensure transmission performance while maintaining low hardware costs and power consumption. To incorporate the merits of RIS into the DAS from practical consideration, a novel architecture of ``Reconfigurable Distributed Antennas and Reflecting Surfaces (RDARS)'' is proposed in this paper. Specifically, based on the design of the additional direct-through state together with the existing high-quality fronthaul link, any element of the RDARS can be dynamically programmed to connect with the base station (BS) via fibers and perform the connected mode as remote distributed antennas of the BS to receive or transmit signals. Additionally, RDARS also inherits the low-cost and low-energy-consumption benefits of fully passive RISs by default configuring the elements as passive to perform the reflection mode. As a result, RDARS offers flexible control over the trade-off between distribution gain and reflection gain to enhance performance. The ergodic achievable rate under the RDARS architecture is analyzed and closed-form expression with meaningful insights is derived. The theoretical analysis and simulation results prove that the RDARS achieves a higher achievable rate than both DAS and RIS. A RDARS prototype with 256 elements is built for real experiments which shows that the RDARS-aided system can achieve an additional 21% and 170% throughput improvement over DAS and RIS-aided systems, respectively.

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。

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