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arXiv 2101.04802cs.ITeess.SPmath.IT
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NOMA在多天线网络中有效吗?下一代多址技术述评

Is NOMA Efficient in Multi-Antenna Networks? A Critical Look at Next Generation Multiple Access Techniques

Bruno Clerckx, Yijie Mao, Robert Schober, Eduard Jorswieck, David J. Love, Jinhong Yuan, Lajos Hanzo, Geoffrey Ye Li, Erik G. Larsson, Giuseppe Caire

摘要:

在本文中,我们需要一个关键的和新的看看下行链路多天线NOMA文献。我们将NOMA与其他两个基线进行对比,而不是将NOMA与OMA进行对比。第一种是传统的多用户线性预编码(MULP)。第二种是基于多天线速率分裂(RS)和SIC的速率分裂多址(RSMA)。我们表明,有一些关于NOMA的好处混淆,我们消除了相关的误解。首先,我们强调为什么NOMA是低效的多天线设置的基础上,基本的复用增益分析。我们强调,问题在于如何NOMA文献已匆忙应用于多天线设置,导致空间维度的误用,因此在复用增益和速率的损失。其次,我们表明,NOMA招致严重的复用增益损失,尽管增加了接收机的复杂性,由于低效使用SIC接收机。第三,我们强调NOMA的大部分优点是由于不断与OMA进行比较,而不是将其与MULP和RS基线进行比较。然后,我们暴露了关键的设计约束,多天线NOMA需要一个用户完全解码的其他用户的消息。这种设计约束是多天线设置中SIC接收机的复用增益侵蚀、速率损失和低效使用的原因。我们的研究结果证实,NOMA不应该盲目地应用于多天线设置,突出的情况下,MULP优于NOMA,反之亦然,并证明效率低下,性能损失和复杂性的NOMA相比,RS的缺点。第一个要点是,虽然NOMA在大多数多天线部署中没有好处。第二个要点消息是,存在其他非正交传输框架,例如RS,其充分利用复用增益和SIC的益处来提高多天线设置中的速率。

英文摘要:

In this paper, we take a critical and fresh look at the downlink multi-antenna NOMA literature. Instead of contrasting NOMA with OMA, we contrast NOMA with two other baselines. The first is conventional Multi-User Linear Precoding (MULP). The second is Rate-Splitting Multiple Access (RSMA) based on multi-antenna Rate-Splitting (RS) and SIC. We show that there is some confusion about the benefits of NOMA, and we dispel the associated misconceptions. First, we highlight why NOMA is inefficient in multi-antenna settings based on basic multiplexing gain analysis. We stress that the issue lies in how the NOMA literature has been hastily applied to multi-antenna setups, resulting in a misuse of spatial dimensions and therefore loss in multiplexing gains and rate. Second, we show that NOMA incurs a severe multiplexing gain loss despite an increased receiver complexity due to an inefficient use of SIC receivers. Third, we emphasize that much of the merits of NOMA are due to the constant comparison to OMA instead of comparing it to MULP and RS baselines. We then expose the pivotal design constraint that multi-antenna NOMA requires one user to fully decode the messages of the other users. This design constraint is responsible for the multiplexing gain erosion, rate loss, and inefficient use of SIC receivers in multi-antenna settings. Our results confirm that NOMA should not be applied blindly to multi-antenna settings, highlight the scenarios where MULP outperforms NOMA and vice versa, and demonstrate the inefficiency, performance loss and complexity disadvantages of NOMA compared to RS. The first takeaway message is that, while NOMA is not beneficial in most multi-antenna deployments. The second takeaway message is that other non-orthogonal transmission frameworks, such as RS, exist which fully exploit the multiplexing gain and the benefits of SIC to boost the rate in multi-antenna settings.

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