NOMA-Assisted Grant-Free Transmission: How to Design Pre-Configured SNR Levels?
NOMA-Assisted Grant-Free Transmission: How to Design Pre-Configured SNR Levels?
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DOI：
10.1109/lwc.2023.3330785
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发表时间：
2023-07
影响因子：
6.3
通讯作者：
Z. Ding;R. Schober;B. Sharif;and Poor
中科院分区：
文献类型：
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作者：
Z. Ding;R. Schober;B. Sharif;and Poor
非正交多址接入（NOMA）辅助免授权传输的关键思想是创建预配置的接收信噪比（SNR）水平，其可以用于以类似于传统带宽资源（诸如时隙和子载波）的方式为用户服务。在文献中，存在两种不同的SNR级设计，这封信的目的是研究它们对免授权传输性能的影响，其中采用信息年龄作为性能指标，因为它不仅捕获物理层的故障，如中断和比特错误，而且还捕获用户冲突引起的错误。所提出的分析和仿真结果表明，通过正交多址NOMA实现的性能增益，也揭示了所考虑的设计预先配置的SNR水平的相对优点。
The key idea of non-orthogonal multiple access (NOMA) assisted grant-free transmission is to create pre-configured receive signal-to-noise ratio (SNR) levels that can be used to serve users in a way similar to conventional bandwidth resources, such as time slots and subcarriers. In the literature, there exist two different SNR-level designs, and the aim of this letter is to investigate their impact on the performance of grant-free transmission, where age-of-information is adopted as the performance metric as it captures not only failures at the physical layer, such as outages and bit errors, but also errors caused by user collisions. The presented analytical and simulation results illustrate the performance gain achieved by NOMA over orthogonal multiple access, and also reveal the relative merits of the considered designs for pre-configured SNR levels.