当前位置: X-MOL 学术IEEE Commun. Mag. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
NOMA for Next-Generation Massive IoT: Performance Potential and Technology Directions
IEEE Communications Magazine ( IF 11.2 ) Pub Date : 2021-07-30 , DOI: 10.1109/mcom.001.2000997
Yifei Yuan , Sen Wang , Yongpeng Wu , H. Vincent Poor , Zhiguo Ding , Xiaohu You , Lajos Hanzo

Broader applications of the Internet of Things (loT) are expected in the forthcoming 6G system, although massive loT is already a key scenario in 5G, predominantly relying on physical layer solutions inherited from 4G LTE and primarily using orthogonal multiple access (OMA). In 6G loT, supporting a massive number of connections will be required for diverse services of the vertical sectors, prompting fundamental studies on how to improve the spectral efficiency of the system. One of the key enabling technologies is non-or-thogonal multiple access (NOMA). This article consists of two parts. In the first part, finite block length theory and the diversity order of multi-user systems are used to show the significant potential of NOMA compared to traditional OMA. The supremacy of NOMA over OMA is particularly pronounced for asynchronous contention-based systems relying on imperfect link adaptation, which are commonly assumed for massive loT systems. To approach these performance bounds, in the second part of the article, several promising technology directions are proposed for 6G massive loT, including linear spreading, joint spreading and modulation, multi-user channel coding in the context of various techniques for practical uncoordinated transmissions, cell-free operations, and so on, from the perspective of NOMA.

中文翻译:

面向下一代大规模物联网的 NOMA:性能潜力和技术方向

在即将到来的 6G 系统中,预计物联网 (loT) 将有更广泛的应用,尽管大规模 loT 已经是 5G 中的一个关键场景,主要依赖于从 4G LTE 继承的物理层解决方案,并且主要使用正交多址 (OMA)。在 6G 物联网中,垂直行业的多样化业务需要支持海量连接,这促使基础研究如何提高系统的频谱效率。非正交多路访问 (NOMA) 是一项关键的支持技术。本文由两部分组成。在第一部分,有限块长度理论和多用户系统的分集顺序被用来展示NOMA与传统OMA相比的巨大潜力。NOMA 优于 OMA 的优势对于依赖于不完美链路自适应的异步竞争系统尤为明显,这通常是大规模物联网系统的假设。为了接近这些性能界限,在文章的第二部分,针对 6G 大规模物联网提出了几个有前景的技术方向,包括线性扩展、联合扩展和调制、在各种实际非协调传输技术背景下的多用户信道编码,从 NOMA 的角度来看,无细胞操作等。
更新日期:2021-08-02
down
wechat
bug