论文标题
宽带可重新配置的智能表面辅助辅助网络的能力提高
Capacity Improvement in Wideband Reconfigurable Intelligent Surface-Aided Cell-Free Network
论文作者
论文摘要
由于对电池间干扰的强大能力，无单元网络被认为是提高未来无线系统网络容量的有前途技术。但是，为了进一步提高能力，它需要以高成本和功耗来部署更多的基站（BSS）。为了解决这个问题，灵感来自最近提出的称为可重构智能表面（RIS）的技术，我们提出了RIS辅助网络网络的概念，以通过低成本和功耗来提高网络容量。然后，对于典型的宽带场景中提出的无RIS辅助细胞网络，我们在BSS和RISS中制定了关节预编码设计问题，以最大程度地提高网络容量。由于法式问题的非凸度和高复杂性，我们开发了一种交替的优化算法来解决这个具有挑战性的问题。请注意，现有作品中大多数考虑的方案是本文一般情况的特殊情况，并且拟议的联合预编码框架也可以作为一般解决方案，以最大程度地利用现有的RIS辅助方案。最后，模拟结果验证了与常规的无单元网络相比，可以显着提高所提出方案的网络容量。
Thanks to the strong ability against the inter-cell interference, cell-free network has been considered as a promising technique to improve the network capacity of future wireless systems. However, for further capacity enhancement, it requires to deploy more base stations (BSs) with high cost and power consumption. To address the issue, inspired by the recently proposed technique called reconfigurable intelligent surface (RIS), we propose the concept of RIS-aided cell-free network to improve the network capacity with low cost and power consumption. Then, for the proposed RIS-aided cell-free network in the typical wideband scenario, we formulate the joint precoding design problem at the BSs and RISs to maximize the network capacity. Due to the non-convexity and high complexity of the formulated problem, we develop an alternating optimization algorithm to solve this challenging problem. Note that most of the considered scenarios in existing works are special cases of the general scenario in this paper, and the proposed joint precoding framework can also serve as a general solution to maximize the capacity in most of existing RIS-aided scenarios. Finally, simulation results verify that, compared with the conventional cell-free network, the network capacity of the proposed scheme can be improved significantly.
