Faculty of Electronics Technology, Industrial University of Ho Chi Minh City (IUH), Ho Chi Minh City 700000, Vietnam.
Wireless Communications Research Group, Faculty of Electrical and Electronics Engineering, Ton Duc Thang University, Ho Chi Minh City 700000, Vietnam.
Sensors (Basel). 2019 Mar 14;19(6):1293. doi: 10.3390/s19061293.
In this paper, a cooperative non-orthogonal multiple access (NOMA) system is studied for the Internet-of-Things (IoT) in which a master node intends to serve multiple client nodes. The adaptive transmission strategy is proposed at the relay node, i.e., the relay can be half-duplex (HD) and/or full duplex (FD). In practical terms, numerous low-cost devices are deployed in such IoT systems and it exhibits degraded performance due to hardware imperfections. In particular, the effects of hardware impairments in the NOMA users are investigated. Specifically, the closed-form expressions are derived for the outage probability. Moreover, the ergodic capacity is also analysed. This study also comparatively analyzes the orthogonal multiple access (OMA) and NOMA with HD and/or FD relaying. The numerical results are corroborated through Monte Carlo simulations.
在本文中，研究了物联网中的协作非正交多址（NOMA）系统，其中主节点旨在为多个客户端节点提供服务。在中继节点处提出了自适应传输策略，即中继可以是半双工（HD）和/或全双工（FD）。在实际中，大量低成本设备部署在这样的物联网系统中，由于硬件不完善，其性能会降低。特别是，研究了 NOMA 用户中硬件缺陷的影响。具体来说，推导了中断概率的闭式表达式。此外，还分析了遍历容量。本研究还比较分析了具有 HD 和/或 FD 中继的正交多址（OMA）和 NOMA。数值结果通过蒙特卡罗仿真得到验证。
