电信线路
诺玛
波束赋形
最大化
计算机科学
数学优化
约束(计算机辅助设计)
放松(心理学)
无线
功率(物理)
功率控制
接头(建筑物)
数学
电信
工程类
物理
建筑工程
几何学
社会心理学
量子力学
心理学
作者
Ming Zeng,Xingwang Li,Gen Li,Wanming Hao,Octavia A. Dobre
标识
DOI:10.1109/lcomm.2020.3025978
摘要
An intelligent reflecting surface (IRS) consists of a large number of low-cost reflecting elements, which can steer the incident signal collaboratively by passive beamforming. This way, IRS reconfigures the wireless environment to boost the system performance. In this paper, we consider an IRS-assisted uplink non-orthogonal multiple access (NOMA) system. The objective is to maximize the sum rate of all users under individual power constraint. The considered problem requires a joint power control at the users and beamforming design at the IRS, and is nonconvex. To handle it, semidefinite relaxation is employed, which provides a near-optimal solution. Presented numerical results show that the proposed NOMA-based scheme achieves a larger sum rate than orthogonal multiple access (OMA)-based one. Moreover, the impact of the number of reflecting elements on the sum rate is revealed.
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