Considerations on Tradeoff Between Downlink NOMA and Beamforming in Mobile Systems
Considerations on Tradeoff Between Downlink NOMA and Beamforming in Mobile Systems
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DOI：
10.1109/icoin56518.2023.10048952
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发表时间：
2023-01
期刊：
影响因子：
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通讯作者：
Kentaro Yoda;Takumi Yasaka;Kohei Miyashita;S. Suyama;H. Otsuka
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文献类型：
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作者：
Kentaro Yoda;Takumi Yasaka;Kohei Miyashita;S. Suyama;H. Otsuka
非正交多址（NOMA）是提高第五代（5G）移动系统频谱效率的潜在候选技术。建立波束成形是为了提高5G移动系统中的数据速率和/或扩展蜂窝覆盖范围。然而，同时使用下行NOMA和波束成形的用户吞吐量性能还没有得到充分的评估。在本文中，我们使用系统级计算机模拟，评估了使用下行链路NOMA和波束形成的移动系统的用户吞吐量作为传输（Tx）波束数的函数。根据这些结果，我们讨论了下行链路NOMA和波束形成之间的权衡。具体来说，我们证实下行NOMA和波束成形一起使用可以提高用户吞吐量，但下行NOMA的改进率随着Tx波束数的增加而降低。
Non-orthogonal multiple access (NOMA) is a potential candidate for increasing the spectral efficiency for fifth-generation (5G) mobile systems. Beamforming is established to improve data rates and/or extend cell coverage in 5G mobile systems. However, the user throughput performance using downlink NOMA and beamforming together has not been sufficiently evaluated. In this paper, we evaluate the user throughput of mobile systems using downlink NOMA and beamforming as a function of the number of transmission (Tx) beams, using system-level computer simulations. From these results, we discuss the tradeoff between downlink NOMA and beamforming. Specifically, we confirm that the use of downlink NOMA and beamforming together can increase the user throughput, however the improvement rate of downlink NOMA decreases as the number of Tx beams increases.