论文标题
基于代码书的解决方案，用于可重构智能表面及其公开挑战
Codebook-Based Solutions for Reconfigurable Intelligent Surfaces and Their Open Challenges
论文作者
论文摘要
可重新配置的智能表面（RIS）是一种革命性的技术，可在成本效益上提高无线网络的性能。我们首先回顾了RIS辅助通信系统中的频道估计和被动式波束形成（CE＆PBF）的现有框架。为了减少CE＆PBF框架的过度飞行员信号开销和实施复杂性，我们构想了一个基于密码的框架，以在通信性能和信号开销之间进行灵活的权衡。此外，我们为RIS反射模式的代码书设计和学习机制提供了有用的见解。最后，我们通过灵活地将培训开销适应指定的服务质量要求，然后详细说明其在现有CE＆PBF方法上的吸引力。结果表明，我们基于编码的新颖框架可以有益地应用于所有RIS辅助方案，并避免了其现有对应物所面临的模型依赖性的诅咒，从而构成了实用RIS辅助通信系统的竞争解决方案。
Reconfigurable intelligent surfaces (RIS) is a revolutionary technology to cost-effectively improve the performance of wireless networks. We first review the existing framework of channel estimation and passive beamforming (CE & PBF) in RIS-assisted communication systems. To reduce the excessive pilot signaling overhead and implementation complexity of the CE & PBF framework, we conceive a codebook-based framework to strike flexible tradeoffs between communication performance and signaling overhead. Moreover, we provide useful insights into the codebook design and learning mechanisms of the RIS reflection pattern. Finally, we analyze the scalability of the proposed framework by flexibly adapting the training overhead to the specified quality-of-service requirements and then elaborate on its appealing advantages over the existing CE & PBF approaches. It is shown that our novel codebook-based framework can be beneficially applied to all RIS-assisted scenarios and avoids the curse of model dependency faced by its existing counterparts, thus constituting a competitive solution for practical RIS-assisted communication systems.
