Beamforming Design and Performance Analysis of Full-Duplex Cooperative NOMA Systems
Beamforming Design and Performance Analysis of Full-Duplex Cooperative NOMA Systems
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DOI：
10.1109/twc.2019.2913425
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发表时间：
2019-05
影响因子：
10.4
通讯作者：
Z. Mobini;M. Mohammadi;B. K. Chalise;H. Suraweera;Z. Ding
中科院分区：
文献类型：
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作者：
Z. Mobini;M. Mohammadi;B. K. Chalise;H. Suraweera;Z. Ding
我们考虑下行链路非正交多址传输，其中接入点通过全双工多天线中继与一组近用户和远用户通信。针对近用户的用户间干扰和中继端的自干扰，提出了最优和次优的波束形成方案。此外，我们还考虑了两种不同的用户选择准则，即1)随机近用户和随机远用户(RNRF)选择和2)最近用户和最近远用户(NNNF)选择，并推导了近用户和远用户的中断概率。我们的研究结果表明，与半双工业务相比，在NNNF用户选择的情况下，全双工中继可以将近用户的中断概率降低高达63%。在次优波束形成方案下，对于所有发射功率选择，NNNF用户选择表现出比RNRF用户选择更优的性能，而在最优波束形成情况下，RNRF用户选择的性能在高发射功率时收敛于NNNF用户选择。仿真结果验证了分析结果的准确性，便于进行更好的性能比较。
We consider downlink non-orthogonal multiple access transmission where an access point communicates with a set of near and far users via a full-duplex multiple antenna relay. To deal with the inter-user interference at the near user and self-interference at the relay, we propose the optimum and suboptimal beamforming schemes. In addition, we consider two different user selection criteria, namely: 1) random near user and random far user (RNRF) selection and 2) nearest near user and nearest far user (NNNF) selection, and we derive the outage probabilities of the near and far users. Our findings reveal that as compared to half-duplex operation, full-duplex relaying can reduce the outage probability of the near users up to 63% in the case of NNNF user selection. With suboptimal beamforming schemes, the NNNF user selection shows a superior performance as compared to the RNRF user selection for all choices of transmit power, while with the optimum beamforming, the performance of the RNRF user selection converges to the NNNF user selection at high transmit power. The simulation results are provided to confirm the accuracy of the developed analytical results and facilitate a better performance comparison.