论文标题
延迟违反概率和下行链路Noma的有效率超过$α$ - $ $ $ $ $ $褪色渠道
Delay Violation Probability and Effective Rate of Downlink NOMA over $α$-$μ$ Fading Channels
论文作者
论文摘要
非正交多访问（NOMA）是进一步提高第五代（B5G）标准的频谱利用效率的潜在候选者。但是，对下行链路NOMA系统的延迟限制性能的定量几乎没有关注。在本文中，我们分析了两用户下行链路NOMA系统的性能，从延迟违规概率（DVP）和有效速率（ER）方面，对广义α-μ的褪色。特别是，我们得出了DVP上上限的分析表达式，并得出了下行链路Noma系统的确切总和。我们还得出了与ER的高和低信噪比（SNR）近似值（SNR）的分析表达式，以及总和ER上的基本上限，代表了下行链路NOMA系统的Ergodic Sum-rate。我们还分析了相应的时间划分 - 多型正交多访问（OMA）系统的ER。我们的结果表明，尽管Noma始终在实际SNR范围内超过OMA，但在更严重的衰落条件下，相对增益变得较小，并且在存在更严格的延迟服务质量（QOS）约束的情况下也较小。
Non-orthogonal multiple access (NOMA) is a potential candidate to further enhance the spectrum utilization efficiency in beyond fifth-generation (B5G) standards. However, there has been little attention on the quantification of the delay-limited performance of downlink NOMA systems. In this paper, we analyze the performance of a two-user downlink NOMA system over generalized α-μ fading in terms of delay violation probability (DVP) and effective rate (ER). In particular, we derive an analytical expression for an upper bound on the DVP and we derive the exact sum ER of the downlink NOMA system. We also derive analytical expressions for high and low signal-to-noise ratio (SNR) approximations to the sum ER, as well as a fundamental upper bound on the sum ER which represents the ergodic sum-rate for the downlink NOMA system. We also analyze the sum ER of a corresponding time-division-multiplexed orthogonal multiple access (OMA) system. Our results show that while NOMA consistently outperforms OMA over the practical SNR range, the relative gain becomes smaller in more severe fading conditions, and is also smaller in the presence a more strict delay quality-of-service (QoS) constraint.
