论文标题
协调的无源波束形成，用于分布式智能反射表面网络
Coordinated Passive Beamforming for Distributed Intelligent Reflecting Surfaces Network
论文作者
论文摘要
智能反射表面（IRS）是6G中提出的技术，可以通过大量被动反射元素巧妙地重新配置传播环境，从而增强无线网络的性能。但是，当前的作品主要集中于单个IRS授权的无线网络，在这些网络中出现了频道排名缺陷问题。在本文中，我们提出了一个分布式IRS授权的通信网络体系结构，其中多个源用途对通过多个分布式IRS进行通信。我们通过共同优化源和相移矩阵，在所有分布式IRSS上都具有无源光束形成，进一步有助于最大化该网络中可实现的总和率。不幸的是，这个问题被证明是非凸面且高度棘手的，为此，通过解决所得的分数编程问题，为此开发了交替的方法。特别是，提出了封闭形式的表达式，用于在IRSS处进行协调的无源光束。数值结果将证明分布式IRS授权通信网络的算法优势和理想的性能。
Intelligent reflecting surface (IRS) is a proposing technology in 6G to enhance the performance of wireless networks by smartly reconfiguring the propagation environment with a large number of passive reflecting elements. However, current works mainly focus on single IRS-empowered wireless networks, where the channel rank deficiency problem has emerged. In this paper, we propose a distributed IRS-empowered communication network architecture, where multiple source-destination pairs communicate through multiple distributed IRSs. We further contribute to maximize the achievable sum-rates in this network via jointly optimizing the transmit power vector at the sources and the phase shift matrix with passive beamforming at all distributed IRSs. Unfortunately, this problem turns out to be non-convex and highly intractable, for which an alternating approach is developed via solving the resulting fractional programming problems alternatively. In particular, the closed-form expressions are proposed for coordinated passive beamforming at IRSs. The numerical results will demonstrate the algorithmic advantages and desirable performances of the distributed IRS-empowered communication network.
