Non-Orthogonal Multiple Access With Coordinated Direct and User-Assisted Transmission

Non-Orthogonal Multiple Access With Coordinated Direct and User-Assisted Transmission
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具有协调直接和用户辅助传输的非正交多址接入

DOI:
10.1109/lcomm.2020.3026368
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发表时间:
2021-01
期刊:
IEEE Communications Letters
影响因子:
--
通讯作者:
Yang Long
Yang Long
中科院分区:
其他
文献类型:
--
作者:
Yang Mengqi;Chen Jian;Hu Rose Qingyang;Yang Long

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在这封信中,我们研究了非正交多址(NOMA)系统中的协调直接传输和用户辅助传输。通过将协调直接传输集成到用户合作NOMA中,一个远用户(FU)与两个近用户(NUs)一起服务,这两个近用户(NUs)是机会性地从K个NUs池中选择的。对于所考虑的系统,提出了一种NU调度策略,在保证FU性能要求的同时最小化NU的中断概率。导出了每个服务用户的精确和渐近中断概率。结果表明,根据基站的发射速率不同,FU和其中一个调度NU都可以实现全分集顺序K,而另一个调度NU的分集顺序等于${K}-1$或K。
In this letter, we investigate the coordinated direct and user-assisted transmission in a non-orthogonal multiple access (NOMA) system. By integrating the coordinated direct transmission into user-cooperative NOMA, one far user (FU) is served along with two near users (NUs) that are opportunistically selected from a pool of K NUs. For the considered system, an NU scheduling strategy is proposed to minimize the outage probabilities of the NUs whilst ensuring the performance requirement of the FU. Exact and asymptotic outage probability of each served user is derived. Results demonstrate that the FU and one of the scheduled NUs can both achieve the full diversity order K, and the other scheduled NU achieves a diversity order equal to ${K}-1$ or K, depending on the transmit rate of the base station.
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