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arXiv 1809.07072cs.ITmath.IT
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NOMA在大规模MIMO中可以发挥什么作用?

What Role Can NOMA Play in Massive MIMO?

Kamil Senel, Hei Victor Cheng, Emil Björnson, Erik G. Larsson

摘要:

本文试图回答一个简单但基本的问题:NOMA在大规模MIMO中可以发挥什么作用?众所周知,在蜂窝网络中,功率域非正交多址(NOMA)方案可以优于传统的正交多址(OMA)方案。然而,这一事实并不意味着NOMA是大规模MIMO设置中最有效的通信方式,其中基站的天线比小区中的用户多得多。这些设置正在成为未来网络中的规范,并且通常通过假设使用线性多用户波束成形的用户的空间复用来研究。为了回答上述问题,我们分析和比较了NOMA和多用户波束形成在NLOS和LOS场景下的性能。我们发现,后一种方案在大规模MIMO设置中给出了最高的平均和速率。我们还确定了NOMA是大规模MIMO中更好选择的具体情况,并解释了NOMA如何在创建NOMA和多用户波束成形的混合中发挥重要作用,该混合比两个独立方案表现更好。

英文摘要:

This paper seeks to answer a simple but fundamental question: What role can NOMA play in massive MIMO? It is well-established that power-domain non-orthogonal multiple access (NOMA) schemes can outperform conventional orthogonal multiple access (OMA) schemes in cellular networks. However, this fact does not imply that NOMA is the most efficient way to communicate in massive MIMO setups, where the base stations have many more antennas than there are users in the cell. These setups are becoming the norm in future networks and are usually studied by assuming spatial multiplexing of the users using linear multi-user beamforming. To answer the above question, we analyze and compare the performance achieved by NOMA and multi-user beamforming in both NLOS and LOS scenarios. We reveal that the latter scheme gives the highest average sum rate in massive MIMO setups. We also identify specific cases where NOMA is the better choice in massive MIMO and explain how NOMA plays an essential role in creating a hybrid of NOMA and multi-user beamforming that is shown to perform better than two standalone schemes do.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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