Performance Evaluation of Generalized Buffer-State-Based Relay Selection in NOMA-Aided Downlink
Performance Evaluation of Generalized Buffer-State-Based Relay Selection in NOMA-Aided Downlink
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DOI：
10.1109/access.2019.2956542
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发表时间：
2019-11
期刊：
影响因子：
3.9
通讯作者：
Jun Kochi;R. Nakai;S. Sugiura
中科院分区：
文献类型：
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作者：
Jun Kochi;R. Nakai;S. Sugiura
针对支持多个中继节点和目的节点的两跳协作网络，提出了一种基于缓存状态(BSB)的非正交多址(NOMA)辅助下行链路方案。更具体地说，在广播阶段，源节点向多个选择的中继节点广播信息分组。在中继阶段，一个被选择的中继节点根据NOMA原则将分组发送到多个目的节点。这里，在中继节点处使用缓冲区允许我们实现灵活的中继选择。此外，通过基于缓冲区状态的中继选择，避免了空缓冲区状态和满缓冲区状态的不利影响。基于马尔可夫链模型，推导了该方案的理论中断概率和平均分组时延。仿真结果表明，该方案的性能优于现有的最大链路选择基准和BSB中继选择基准。
In this paper, we propose a novel buffer-state-based (BSB) non-orthogonal multiple access (NOMA)-aided downlink scheme for a two-hop cooperative network supporting multiple relay and destination nodes. More specifically, in the broadcast phase, the source node broadcasts information packets to multiple selected relay nodes. In the relaying phase, a selected relay node transmits packets to multiple destination nodes based on the NOMA principle. Here, the use of buffer at the relay nodes allows us to achieve a flexible relay selection. Furthermore, with the aid of buffer-state-based relay selection, the detrimental effects of empty- and full-buffer states are avoided. The theoretical outage probability and average packet delay are derived for our proposed scheme, based on the Markov-chain model. Our simulation results demonstrate that the proposed scheme outperforms the existing max-link and BSB relay selection benchmarks.