Nonorthogonal Multiple Access for 5G and Beyond
Nonorthogonal Multiple Access for 5G and Beyond
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DOI：
10.1109/jproc.2017.2768666
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发表时间：
2017-12-01
影响因子：
20.6
通讯作者：
Hanzo, Lajos
中科院分区：
文献类型：
--
作者：
Liu, Yuanwei;Qin, Zhijin;Hanzo, Lajos
由于先进多媒体应用（如超高清视频、虚拟现实等）对无线容量需求的快速提升，以及物联网（IoT）对用户接入需求的急剧增加，第五代（5G）网络在支持大规模异构数据流量方面面临挑战。最近为第三代合作伙伴项目长期演进高级（3GPP-LTE-A）提出的非正交多址（NOMA）是一项有前途的技术，可以通过在同一正交资源块内容纳多个用户来解决5G网络中的上述挑战。通过这样做，可以比传统的正交多址（OMA）技术获得显著的带宽效率提高。这促使许多研究人员为这一领域做出了大量的研究贡献。在此背景下，我们全面概述了功率域多路复用辅助NOMA技术的发展现状，重点介绍了NOMA的理论原理、多天线辅助NOMA设计、NOMA与协同传输的相互作用、NOMA的资源控制、NOMA与其他新兴潜在5G技术的共存以及与其他NOMA变体的比较。我们强调了功率域复用NOMA与其他现有NOMA技术相比的主要优点。我们总结了NOMA现有研究贡献面临的挑战，并提出了可能的解决方案。最后，我们为NOMA系统提供了一些设计指南，并确定了未来有希望的研究机会。
Driven by the rapid escalation of the wireless capacity requirements imposed by advanced multimedia applications (e.g., ultrahigh-definition video, virtual reality, etc.), as well as the dramatically increasing demand for user access required for the Internet of Things (IoT), the fifth-generation (5G) networks face challenges in terms of supporting large-scale heterogeneous data traffic. Nonorthogonal multiple access (NOMA), which has been recently proposed for the third-generation partnership projects long-term evolution advanced (3GPP-LTE-A), constitutes a promising technology of addressing the aforementioned challenges in 5G networks by accommodating several users within the same orthogonal resource block. By doing so, significant bandwidth efficiency enhancement can be attained over conventional orthogonal multiple-access (OMA) techniques. This motivated numerous researchers to dedicate substantial research contributions to this field. In this context, we provide a comprehensive overview of the state of the art in power-domain multiplexing-aided NOMA, with a focus on the theoretical NOMA principles, multiple-antenna-aided NOMA design, on the interplay between NOMA and cooperative transmission, on the resource control of NOMA, on the coexistence of NOMA with other emerging potential 5G techniques and on the comparison with other NOMA variants. We highlight the main advantages of power-domain multiplexing NOMA compared to other existing NOMA techniques. We summarize the challenges of existing research contributions of NOMA and provide potential solutions. Finally, we offer some design guidelines for NOMA systems and identify promising research opportunities for the future.