面向后5G的非正交多址技术综述

在后5G时代,作为一种候选方案,非正交多址技术(Non-Orthogonal Multiple Access,NOMA)正在被5G的演进技术标准讨论,该技术可以满足大规模连接和高吞吐量的要求。阐述了NOMA技术的基本原理、技术提案、性能仿真和潜在的研究方向。首先概述了NOMA技术的发展和原理,比较了NOMA相比于正交多址技术(Orthogonal Multiple Access,OMA)的优势;根据NOMA技术在资源块(Resource Block,RB)上复用方式的不同,从比特级和符号级的层面讨论了NOMA技术不同的技术路线。其次着重阐述了NOMA技术的仿真实验,以多用户共享接入(Multi-User Shared Access,MUSA)和稀疏码多址接入技术(Sparse Code Multiple Access,SCMA)为例进行了性能分析。最后给出了NOMA在未来的潜在研究方向,包括与多入多出(Multiple-Input Multiple-Output,MIMO)结合、与认知无线电结合和全双工NOMA等。

A Survey of Non-Orthogonal Multiple Access Technology for Beyond-5G

In the Beyond-5G era,NOMA as a candidate is being discussed by the 5G evolution technology standard.NOMA technology can meet the requirements of large-scale connectivity and high throughput.This paper outlines the basic principles,technical proposals,performance simulations,and potential research directions of NOMA technology.First,it summarizes the development and principles of NOMA technology,and compares the advantages of NOMA compared to OMA.Then,according to different multiplexing methods of NOMA technology on the RB,different technical routes of NOMA technology are discussed from the level of the bit level and the symbol level.Thirdly,simulation experiments of NOMA technology are highlighted,and the performance analysis is carried out by taking MUSA and SCMA as examples.Finally,potential research directions of NOMA in the future are given,including:combining with MIMO,combining with cognitive radio and full-duplex NOMA.