论文标题
具有多个智能反射表面的非正交多访问（NOMA）
Non-Orthogonal Multiple Access (NOMA) With Multiple Intelligent Reflecting Surfaces
论文作者
论文摘要
在本文中，研究了具有离散相移的多个智能反射表面（IRSS）辅助的非正交多访问（NOMA）网络，其中IRS提供了每个用户设备（UD），以提高接收信号的质量。根据是否在基站（BS）和每个UD之间存在直接链接，考虑两种情况，并为每个UD分析了中断性能。具体而言，得出了高信噪比（SNR）制度中断电概率上限和下限的渐近表达式。在此之后，获得了多样性顺序。结果表明，离散相移的使用不会降低多样性顺序。更重要的是，模拟结果表明，用于离散相移的3位分辨率足以实现近乎最佳的停电性能。仿真结果还意味着IRS比全双工解码和前向继电器的优越性。
In this paper, non-orthogonal multiple access (NOMA) networks assisted by multiple intelligent reflecting surfaces (IRSs) with discrete phase shifts are investigated, in which each user device (UD) is served by an IRS to improve the quality of the received signal. Two scenarios are considered according to whether there is a direct link between the base station (BS) and each UD, and the outage performance is analyzed for each of them. Specifically, the asymptotic expressions for the upper and lower bounds of the outage probability in the high signal-to-noise ratio (SNR) regime are derived. Following that, the diversity order is obtained. It is shown that the use of discrete phase shifts does not degrade diversity order. More importantly, simulation results reveal that a 3-bit resolution for discrete phase shifts is sufficient to achieve near-optimal outage performance. Simulation results also imply the superiority of IRSs over full-duplex decode-and-forward relays.
