论文标题
有限块长RIS辅助发射光束成形
Finite-Blocklength RIS-Aided Transmit Beamforming
论文作者
论文摘要
本文考虑了一个超级可靠的低延迟通信（URLLC）系统的下行链路，其中基站（BS）在短（有限的）区块长（FBL）借助可重新配置的智能表面（RIS）的帮助下，在短（有限的）区块长（FBL）制度中为多个单人体用户服务。在FBL制度中，用户的可实现率是波束成形向量和RIS可编程反射元素（PRES）的复杂功能。我们提出了发射光束器和PRES的联合设计，即最大化这些速率的几何平均值（GM）（GM速率）的问题，并表明该上述结果正在提供公平的速率分布，从而提供了与所有用户的可靠联系。开发了一种新颖的计算算法，该算法基于封闭形式，以使用其执行方式生成改进的可行点。模拟显示了我们解决方案的优点。
This paper considers the downlink of an ultra-reliable low-latency communication (URLLC) system in which a base station (BS) serves multiple single-antenna users in the short (finite) blocklength (FBL) regime with the assistance of a reconfigurable intelligent surface (RIS). In the FBL regime, the users' achievable rates are complex functions of the beamforming vectors and of the RIS's programmable reflecting elements (PREs). We propose the joint design of the transmit beamformers and PREs, the problem of maximizing the geometric mean (GM) of these rates (GM-rate) and show that this aforementioned results are providing fair rate distribution and thus reliable links to all users. A novel computational algorithm is developed, which is based on closed forms to generate improved feasible points, using its execution. The simulations show the merit of our solution.
