标题： 无线网络中具有分布式可重构智能表面的迭代功率控制 显示英文标题

标题： Iterative Power Control for Wireless Networks with Distributed Reconfigurable Intelligent Surfaces

摘要： 可重构智能表面（RIS）是一种新的范式，通过合理部署和对齐，可以实现更有利的传播环境和更好的无线网络设计。 因此，它们可以为下一代无线系统提供许多潜在的好处，包括改善的覆盖范围、更好的干扰管理和甚至安全性。 在本文中，我们考虑一个上行链路下一代无线系统，其中每个用户都由一个RIS辅助。 我们研究了这种分布式RIS辅助无线网络中的上行链路功率控制问题。 具体来说，我们旨在通过功率、接收器滤波器和RIS相位矩阵的联合设计，以最小化所有用户的总上行链路发射功率，同时满足每个用户在基站的可靠通信需求。 我们提出了一种迭代功率控制算法，结合了连续凸逼近技术来解决具有非凸相位约束的问题。 数值结果表明，当直射链路较弱时，分布式RIS辅助可以带来上行链路功率节省。 显示英文摘要

摘要： Reconfigurable Intelligent Surfaces (RIS) are a new paradigm which, with judicious deployment and alignment, can enable more favorable propagation environments and better wireless network design. As such, they can offer a number of potential benefits for next generation wireless systems including improved coverage, better interference management and even security. In this paper, we consider an uplink next generation wireless system where each user is assisted with an RIS. We study the uplink power control problem in this distributed RIS-assisted wireless network. Specifically, we aim to minimize total uplink transmit power of all the users subject to each user's reliable communication requirements at the base station by a joint design of power, receiver filter and RIS phase matrices. We propose an iterative power control algorithm, combined with a successive convex approximation technique to solve the problem with non-convex phase constraints. Numerical results illustrate that distributed RIS assistance leads to uplink power savings when direct links are weak.