Combining Code-Domain and Power-Domain NOMA for Supporting Higher Number of Users
Combining Code-Domain and Power-Domain NOMA for Supporting Higher Number of Users
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DOI：
10.1109/glocom.2018.8647770
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发表时间：
2018-12
期刊：
影响因子：
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通讯作者：
Naveen Mysore Balasubramanya;Ankit Gupta;M. Sellathurai
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文献类型：
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作者：
Naveen Mysore Balasubramanya;Ankit Gupta;M. Sellathurai
非正交多址接入（NOMA）是第五代（5G）无线通信的关键技术之一。在本文中，一种新的NOMA机制相结合的码域和功率域技术，提出了潜在的支持更多的用户。特别地，考虑稀疏码多址（SCMA）的码域NOMA方法作为基线，使用功率域NOMA在其上添加新的低数据速率（LDR）用户。在这样的系统中，涉及资源和功率分配的优化问题被解决，使得整体可实现的和速率被最大化。仿真结果表明，提出的机制不仅支持更多的用户数，但也表现出更高的可实现的和速率比原来的基于CDMA系统。
Non-orthogonal multiple access (NOMA) is one of the key technologies being evaluated for the fifth generation (5G) wireless communications. In this paper, a novel NOMA mechanism combining both the code-domain and power-domain techniques is proposed to potentially support a higher number of users. In particular, considering the code-domain NOMA method of sparse code multiple access (SCMA) as the baseline, new low data rate (LDR) users are added on top of it using power-domain NOMA. The optimization problem involving resource and power allocation in such a system is solved such that the overall achievable sum-rate is maximized. Simulation results indicate that the proposed mechanism not only supports higher number of users, but also demonstrates a higher achievable sum-rate than the original SCMA-based system.