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arXiv 2007.12408cs.ITmath.IT
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莱斯衰落信道下两用户NOMA的准退化概率

Quasi-Degradation Probability of Two-User NOMA over Rician Fading Channels

Kuang-Hao Liu

摘要:

非正交多址接入(NOMA)具有提供比正交多址接入(OMA)更高的多用户无线网络频谱效率的巨大潜力。以前的工作已经建立了条件,称为准退化(QD)的概率,在此条件下,NOMA没有性能损失相比,实现容量脏纸编码的两个用户的情况下。现有的结果假设瑞利衰落信道没有视线(LOS)。在许多实际场景中,信道LOS分量对链路质量至关重要,其中信道增益遵循Rician分布而不是Rayleigh分布。在这项工作中,我们分析了量子点概率多输入单输出(MISO)信道的莱斯衰落。QD概率很大程度上取决于两个用户信道之间的角度,这涉及随机向量的矩阵二次型和随机矩阵。对于确定性LOS分量,矩阵二次型的分布是非中心的,这使得QD概率的推导变得非常复杂。为了弥补这一困难,提出了一系列的近似,产生一个封闭形式的表达的QD概率MISO Rician信道。数值结果评估分析的准确性,并得到洞察的最优性的NOMA在莱斯衰落信道。

英文摘要:

Non-orthogonal multiple access (NOMA) has a great potential to offer a higher spectral efficiency of multi-user wireless networks than orthogonal multiples access (OMA). Previous work has established the condition, referred to quasi-degradation (QD) probability, under which NOMA has no performance loss compared to the capacity-achieving dirty paper coding for the two-user case. Existing results assume Rayleigh fading channels without line-of-sight (LOS). In many practical scenarios, the channel LOS component is critical to the link quality where the channel gain follows a Rician distribution instead of a Rayleigh distribution. In this work, we analyze the QD probability over multi-input and single-output (MISO) channels subject to Rician fading. The QD probability heavily depends on the angle between two user channels, which involves a matrix quadratic form in random vectors and a stochastic matrix. With the deterministic LOS component, the distribution of the matrix quadratic form is non-central that dramatically complicates the derivation of the QD probability. To remedy this difficulty, a series of approximations is proposed that yields a closed-form expression for the QD probability over MISO Rician channels. Numerical results are presented to assess the analysis accuracy and get insights into the optimality of NOMA over Rician fading channels.

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