论文标题
ris辅助无线通信，$ 1 $ $ - 信号的优化，以增强信号
RIS-aided Wireless Communication with $1$-bit Discrete Optimization for Signal Enhancement
论文作者
论文摘要
近年来，已广泛研究了一项全新的可重构智能表面（RIS），以重新配置无线传播环境。 RIS是电磁物质的人造表面，能够自定义撞击波浪的传播。利用RIS进行通信服务，例如信号增强，通常会导致非凸优化问题。现有的优化方法遇到了$ n $的RIS元素数量的可扩展性问题，或者在某些情况下可能会导致次优的解决方案。在本文中，我们提出了一种分隔（DAS）离散优化方法，可以保证以$ 1 $ -BIT的RIS找到全局最佳相移，并且具有时间复杂性$ \ MATHCAL {O}（n \ log（n））$。数值实验表明，所提出的方法比其他方法获得了更好的``性能 - 复杂的权衡''，价格为1美元。
In recent years, a brand-new technology, reconfigurable intelligent surface (RIS) has been widely studied for reconfiguring the wireless propagation environment. RIS is an artificial surface of electromagnetic material that is capable of customizing the propagation of the wave impinging upon it. Utilizing RIS for communication service like signal enhancement usually lead to non-convex optimization problems. Existing optimization methods either suffers from scalability issues for $N$ number of RIS elements large, or may lead to suboptimal solutions in some scenario. In this paper, we propose a divide-and-sort (DaS) discrete optimization approach, that is guaranteed to find the global optimal phase shifts for $1$-bit RIS, and has time complexity $\mathcal{O}(N \log(N))$. Numerical experiments show that the proposed approach achieves a better ``performance--complexity tradeoff'' over other methods for $1$-bit RIS.
