论文标题
智能反射表面增强的毫米波Noma系统
Intelligent Reflecting Surface Enhanced Millimeter-Wave NOMA Systems
论文作者
论文摘要
在本文中，考虑了一个下行链路智能反射表面（IRS）增强的毫米波（MMWAVE）非正交多访问（NOMA）系统。在主动波束形成，被动边界形成和功率分配上的关节优化问题是制定的。由于变量高度耦合，因此公式的优化问题是非凸。为了解决此问题，提出了基于替代的优化和连续的凸近似值。数值结果表明：1）提出的方案提供了显着的总和收益，这证实了对MMWave-Noma系统引入IRS的有效性； 2）具有离散相移的提议算法可以实现与连续相移的近距性能。
In this paper, a downlink intelligent reflecting surface (IRS) enhanced millimeter-wave (mmWave) non-orthogonal multiple access (NOMA) system is considered. A joint optimization problem over active beamforming, passive beamforming and power allocation is formulated. Due to the highly coupled variables, the formulated optimization problem is non-convex. To solve this problem, an alternative optimization and successive convex approximation based iterative algorithm is proposed. Numerical results illustrate that: 1) the proposed scheme offers significant sum-rate gains, which confirms the effectiveness of introducing IRS for mmWave-NOMA systems; 2) the proposed algorithm with discrete phase shifts can achieve close performance to that of continuous phase shifts.
