论文标题
下行链路和上行链路智能反射表面辅助网络：Noma和OMA
Downlink and Uplink Intelligent Reflecting Surface Aided Networks: NOMA and OMA
论文作者
论文摘要
设想智能反射表面（IRS）为将来的通信网络提供可重构的无线环境。在本文中，研究了下行链路和上行链路IRS AD的非正交多访问（NOMA）和正交多访问（OMA）网络，其中部署了IRS来通过协助Cell-Edge用户设备（UD）与基础站（BS）通信（BS）来增强覆盖范围。为了表征系统性能，研究了BS-IRS-UD链接与Nakagami-$ m $ vading的新频道统计。对于每种情况，都会得出了中断概率和厄乳速率的闭合形式表达式。为了获得进一步的见解，根据高SNR策略中的渐近近似，获得了每种情况的多样性顺序和高信噪比（SNR）斜率。已经证明，多样性顺序受反映元素和中anagami褪色参数的IR数量的影响，但是高SNR斜率与这些参数无关。仿真结果验证了我们的分析，并揭示了IRS优于全双工解码和前向继电器。
Intelligent reflecting surfaces (IRSs) are envisioned to provide reconfigurable wireless environments for future communication networks. In this paper, both downlink and uplink IRS-aided non-orthogonal multiple access (NOMA) and orthogonal multiple access (OMA) networks are studied, in which an IRS is deployed to enhance the coverage by assisting a cell-edge user device (UD) to communicate with the base station (BS). To characterize system performance, new channel statistics of the BS-IRS-UD link with Nakagami-$m$ fading are investigated. For each scenario, the closed-form expressions for the outage probability and ergodic rate are derived. To gain further insight, the diversity order and high signal-to-noise ratio (SNR) slope for each scenario are obtained according to asymptotic approximations in the high-SNR regime. It is demonstrated that the diversity order is affected by the number of IRS reflecting elements and Nakagami fading parameters, but the high-SNR slope is not related to these parameters. Simulation results validate our analysis and reveal the superiority of the IRS over the full-duplex decode-and-forward relay.
