论文标题
基于NOMA的钻石继电器改善了错误性能
Improved Error Performance in NOMA-based Diamond Relaying
论文作者
论文摘要
由于NOMA的整合，非正交的多重访问（NOMA）基于基于的合作继电器系统（CRS）已成为解决常规合作中继系统的光谱效率低下问题的解决方案。因此，作为NOMA-CRS的子集，基于NOMA的钻石继电器网络（NOMA-DRN）在吞吐量方面也提供了性能增长。但是，由于第二阶段（上行链路），Noma-DRN的错误性能较差，实际上，它具有错误的地板，无论发射功率，功率分配和频道质量如何。为了解决这个问题，在本文中，我们提出了一种新颖的Noma-DRN方案，其中关节最大可能性（JML）解码在目的地实施。然后，我们使用JML定义了NOMA-DRN的性能指标（即，位错误率（BER）和多样性顺序）并分析计算复杂性。此外，我们证明了带有JML的新的Noma-DRN可以应对常规Noma-DRN的误差罚款。因此，使用高数据可靠性可以实现光谱有效的NOMA-CRS方案。具体而言，这种改进可以达到传输功率的$ \ sim20-30db $，这在能源效率的角度方面是极好的增益。此外，使用JML提出的NOMA-DRN，可以在低中等的SNR区域实现完整的多样性顺序。
Non-orthogonal multiple access (NOMA)-based cooperative relaying systems (CRS) has emerged as a solution to the spectral inefficiency problem of the conventional cooperative relaying systems thanks to the NOMA integration. Thus, as a subset of NOMA-CRS, the NOMA-based diamond relaying network (NOMA-DRN) also provides a performance gain in terms of throughput. However, the NOMA-DRN has a poor error performance due to the second phase (uplink), indeed, it has a error floor regardless of the transmit power, power allocation and channel qualities. To address this problem, in this paper, we propose a novel NOMA-DRN schemes where joint maximum likelihood (JML) decoding is implemented at the destination. Then, we define the performance metrics (i.e., bit error rate (BER) and the diversity order ) of the NOMA-DRN with the JML and analyze the computational complexity. Moreover, we demonstrate that the new NOMA-DRN with JML can cope with the error floor penalty of the conventional NOMA-DRN. Hence, a spectral efficient NOMA-CRS scheme can be achieved with high data reliability. Specifically, this improvement can reach to $\sim20-30dB$ in the transmit power which is superb gain in terms of energy efficiency perspective. Furthermore, with the proposed NOMA-DRN with the JML, the full diversity order can be achieved in the low-medium SNR region.
