Power Allocation for D2D NOMA in Cache-Aided Networks
Power Allocation for D2D NOMA in Cache-Aided Networks
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DOI：
10.1109/vtc2021-fall52928.2021.9625282
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发表时间：
2021-09
期刊：
影响因子：
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通讯作者：
Kevin Z. Shen;D. So
中科院分区：
文献类型：
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作者：
Kevin Z. Shen;D. So
与正交方案相比，非正交多址接入（NOMA）在提高系统的频谱效率和总速率方面是有效的。除此之外，随着移动的用户消费更丰富的内容，设备到设备通信（D2D）和无线缓存在进一步优化资源使用方面的作用将变得更加突出。在本文中，我们提出了一个系统，其中用户能够交换有用的缓存内容，通过D2D链路，其中底层的下行NOMA传输。我们制定了一个总和速率最大化的问题，是受最小速率约束，并推导出一个次优的功率分配解决方案的基础上，低自干扰的假设。仿真结果表明D2D通信的有效性相比，最佳的传统NOMA下行链路，以及突出的次优功率分配和最佳功率分配之间的性能的相似性。
Non-orthogonal multiple access (NOMA) is effective in enhancing the spectral efficiency and sum rate of a system as compared to an orthogonal scheme. In addition to this, as mobile users consume more rich content, the role of device-to-device communications (D2D) and wireless caching will become more prominent in further optimizing the usage of resources. In this paper, we propose a system in which users are able to exchange useful cached content with each other via a D2D link which underlays a downlink NOMA transmission. We formulated a sum rate maximization problem that is subject to minimum rate constraints and derived a sub-optimal power allocation solution based on a low self-interference assumption. Simulation results demonstrate the effectiveness of D2D communications in comparison with optimum conventional NOMA downlink, as well as highlighting the similarity in performance between the suboptimal power allocation and the optimum power allocation.