论文标题
智能无线电环境中可重构智能表面的高架意识设计
Overhead-Aware Design of Reconfigurable Intelligent Surfaces in Smart Radio Environments
论文作者
论文摘要
可重构的智能表面已成为未来无线网络的有前途的技术。鉴于通常通常使用大量反射元素,并且表面没有信号处理功能,因此一个主要的挑战是应对估计通道状态信息所需的开销,并报告优化的相位移动到表面。以前的工作尚未解决此问题,在资源分配阶段,没有明确考虑开销。这项工作旨在填补这一空白,为无线网络开发一个高空感知的资源分配框架,在该网络中,可使用可重构的智能表面来改善通信性能。开发并纳入了系统速率和能量效率的表达式中,然后将其相对于可重构智能表面的相移,传输和接收过滤器以及用于通信和反馈阶段的功率和带宽进行了优化。也实现了速率和能源效率的双向目标最大化。所提出的框架允许表征具有可重构智能表面的网络中优化无线电资源与相关开销之间的权衡。
Reconfigurable intelligent surfaces have emerged as a promising technology for future wireless networks. Given that a large number of reflecting elements is typically used, and that the surface has no signal processing capabilities, a major challenge is to cope with the overhead that is required to estimate the channel state information and to report the optimized phase shifts to the surface. This issue has not been addressed by previous works, which do not explicitly consider the overhead during the resource allocation phase. This work aims at filling this gap, developing an overhead-aware resource allocation framework for wireless networks where reconfigurable intelligent surfaces are used to improve the communication performance. An overhead model is developed and incorporated in the expressions of the system rate and energy efficiencies, which are then optimized with respect to the phase shifts of the reconfigurable intelligent surface, the transmit and receive filters, and the power and bandwidth used for the communication and feedback phases. The bi-objective maximization of the rate and energy efficiency is carried out as well. The proposed framework allows characterizing the trade-off between optimized radio resources and the related overhead in networks with reconfigurable intelligent surfaces.