波束赋形
水准点(测量)
基站
计算机科学
电信线路
无线
最优化问题
信号(编程语言)
电子工程
算法
数学优化
电信
工程类
数学
大地测量学
程序设计语言
地理
作者
Huayan Guo,Ying‐Chang Liang,Jie Chen,Erik G. Larsson
出处
期刊:Cornell University - arXiv
日期:2019-01-01
被引量:137
标识
DOI:10.48550/arxiv.1905.07920
摘要
Intelligent reflecting surface (IRS) is a promising solution to build a programmable wireless environment for future communication systems. In practice, an IRS consists of massive low-cost elements, which can steer the incident signal in fully customizable ways by passive beamforming. In this paper, we consider an IRS-aided multiuser multiple-input single-output (MISO) downlink communication system. In particular, the weighted sum-rate of all users is maximized by joint optimizing the active beamforming at the base-station (BS) and the passive beamforming at the IRS. In addition, we consider a practical IRS assumption, in which the passive elements can only shift the incident signal to discrete phase levels. This non-convex problem is firstly decoupled via Lagrangian dual transform, and then the active and passive beamforming can be optimized alternatingly. The active beamforming at BS is optimized based on the fractional programming method. Then, three efficient algorithms with closed-form expressions are proposed for the passive beamforming at IRS. Simulation results have verified the effectiveness of the proposed algorithms as compared to different benchmark schemes.
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