Non-Orthogonal Multiple Access for Cooperative Communications: Challenges, Opportunities, and Trends
Non-Orthogonal Multiple Access for Cooperative Communications: Challenges, Opportunities, and Trends
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DOI：
10.1109/mwc.2018.1700134
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发表时间：
2018-01
影响因子：
12.9
通讯作者：
Dehuan Wan;Miaowen Wen;Fei Ji;Hua Yu;Fangjiong Chen
中科院分区：
文献类型：
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作者：
Dehuan Wan;Miaowen Wen;Fei Ji;Hua Yu;Fangjiong Chen
NOMA是下一代无线网络的一种很有前途的无线接入技术。在这篇文章中，我们研究了基于NOMA的协作中继网络。我们开始与现有的中继辅助NOMA系统的介绍，通过将它们分为三类：上行链路，下行链路和复合架构。然后，我们讨论了它们的原理和关键特性，并从频谱效率，能量效率和总发射功率的角度进行了全面的比较。进一步讨论了一种称为混合功率分配的新策略，该策略可以以降低边际和速率为代价来降低计算复杂度和信令开销。最后，主要的挑战，机遇，和未来的研究趋势，设计NOMA为基础的协作中继系统与其他技术也突出了在这一领域的研究人员提供见解。
NOMA is a promising radio access technique for next-generation wireless networks. In this article, we investigate the NOMA-based cooperative relay network. We begin with an introduction of the existing relay-assisted NOMA systems by classifying them into three categories: uplink, downlink, and composite architectures. Then we discuss their principles and key features, and provide a comprehensive comparison from the perspective of spectral efficiency, energy efficiency, and total transmit power. A novel strategy called hybrid power allocation is further discussed for the composite architecture, which can reduce the computational complexity and signaling overhead at the expense of marginal sum rate degradation. Finally, major challenges, opportunities, and future research trends for the design of NOMA-based cooperative relay systems with other techniques are also highlighted to provide insights for researchers in this field.