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Performance analysis of downlink NOMA system with diversity combining schemes over n-μ fading channel

机译：N-μ衰落频道多样性组合方案的下行链路NOMM系统性能分析

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摘要

A novel downlink multiuser non-orthogonal multiple access (NOMA) system is proposed in which diversity combining techniques are employed at each user. In particular, selection combining (SC), equal gain combining (EGC), and maximum ratio combining (MRC) diversity techniques are adopted by each user to improve the performance of the system. The outage and sum-rate analysis of the proposed system are presented for L branch diversity combiner over eta-mu fading channel with imperfect successive interference cancellation (SIC). In addition, an exact closed-form expression for the probability density function (PDF) of signal-to-noise ratio (SNR) at the output of equal gain combiner is derived using Laplace transform approach for eta-mu fading channel. The proposed system completely outperforms the conventional NOMA system and among the proposed schemes, NOMA with MRC diversity has the best performance, as expected. The outage performance of the proposed NOMA system is compared with that of orthogonal multiple access (OMA) system. The theoretical results are verified with the simulation results. (C) 2021 Elsevier B.V. All rights reserved.
机译：提出了一种新颖的下行链路多用户非正交多访问（NOMA）系统，其中在每个用户采用分集组合技术。特别地，每个用户采用选择组合（SC），等于增益组合（EGC）和最大比率组合（MRC）分集技术，以改善系统的性能。拟议系统的停电和总和分析为L分支多样性组合器介绍了ETA-MU衰落通道，具有不完美的连续干扰消除（SIC）。另外，使用Laplace变换方法进行ETA-MU衰落通道的Laplace变换方法导出在等增益组合器输出处的信噪比（SNR）的概率密度函数（PDF）的精确闭合表达式。所提出的系统完全优于传统的NOMM系统和拟议的方案，利用MRC多样性的NOMA具有最佳性能，如预期的那样。将所提出的NOMM系统的停电性能与正交多通道（OMA）系统进行比较。通过模拟结果验证了理论结果。 （c）2021 elestvier b.v.保留所有权利。

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