当前位置: X-MOL 学术IEEE Wirel. Commun. Lett. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Cooperative Beam Routing for Multi-IRS Aided Communication
IEEE Wireless Communications Letters ( IF 6.3 ) Pub Date : 2021-02-01 , DOI: 10.1109/lwc.2020.3034370
Weidong Mei 1 , Rui Zhang 1
Affiliation  

Intelligent reflecting surface (IRS) has been deemed as a transformative technology to achieve smart and reconfigurable environment for wireless communication. This letter studies a new IRS-aided communication system, where multiple IRSs assist in the communication between a multi-antenna base station (BS) and a remote single-antenna user by multi-hop signal reflection. Specifically, by exploiting the line-of-sight (LoS) link between nearby IRSs, a multi-hop cascaded LoS link between the BS and user is established where a set of IRSs are selected to successively reflect the BS's signal, so that the received signal power at the user is maximized. To tackle this new problem, we first present the closed-form solutions for the optimal active and cooperative passive beamforming at the BS and selected IRSs, respectively, for a given beam route. Then, we derive the end-to-end channel power, which unveils a fundamental trade-off in the optimal beam routing design between maximizing the multiplicative passive beamforming gain and minimizing the multi-reflection path loss. To reconcile this trade-off, we recast the IRS selection and beam routing problem as an equivalent shortest simple-path problem in graph theory and solve it optimally. Numerical results show significant performance gains of the proposed algorithm over benchmark schemes and also draw useful insights into the optimal beam routing design.

中文翻译:

用于多 IRS 辅助通信的协作波束路由

智能反射面(IRS)被认为是实现无线通信智能和可重构环境的变革性技术。这封信研究了一种新的 IRS 辅助通信系统,其中多个 IRS 通过多跳信号反射来辅助多天线基站 (BS) 和远程单天线用户之间的通信。具体来说,通过利用附近 IRS 之间的视距 (LoS) 链路,在 BS 和用户之间建立多跳级联的 LoS 链路,其中选择一组 IRS 依次反射 BS 的信号,以便接收到的用户处的信号功率最大化。为了解决这个新问题,我们首先针对给定的波束路径分别在 BS 和选定的 IRS 处提出了最佳主动和协作被动波束形成的封闭形式解决方案。然后,我们推导出端到端信道功率,它揭示了在最大化乘法无源波束成形增益和最小化多反射路径损耗之间的最佳波束路由设计中的基本权衡。为了调和这种权衡,我们将 IRS 选择和波束路由问题重新定义为图论中等效的最短简单路径问题,并对其进行优化解决。数值结果表明,所提出的算法比基准方案具有显着的性能提升,并且还为最佳波束路由设计提供了有用的见解。我们将 IRS 选择和波束路由问题重新定义为图论中等效的最短简单路径问题并优化解决。数值结果表明,所提出的算法比基准方案具有显着的性能提升,并且还为最佳波束路由设计提供了有用的见解。我们将 IRS 选择和波束路由问题重新定义为图论中等效的最短简单路径问题并优化解决。数值结果表明,所提出的算法比基准方案具有显着的性能提升,并且还为最佳波束路由设计提供了有用的见解。
更新日期:2021-02-01
down
wechat
bug