In this article, we study the application of cooperative non-orthogonal multiple access (NOMA) in power line communication (PLC) where two users exchange information using a two-way relay (TWR). Under the assumption of perfect and imperfect successive interference cancellation (SIC), we analyze key performance metrics for PLC log-normal channels impaired by impulsive noise. In particular, for delay-limited (DL) and delay-tolerant (DT) modes, approximate closed-form expressions are derived for the user outage probability and user ergodic rate. The analytic results are verified via Monte Carlo simulations. Compared with the conventional orthogonal multiple access (OMA) scheme, the simulation results show that our proposed NOMA TWR enhances the user outage probability and the user ergodic rate performance in the low signal-to-noise ratio (SNR) region. However, this gain diminishes as the imperfect SIC error increases and is non-existent beyond a certain level of imperfect SIC. Furthermore, the system performance is maximized by optimizing the power allocation coefficients where the system throughput and ergodic sum-rate of the NOMA TWR network in DL and DT operation, respectively, are shown to approach a ceiling in the presence of imperfect SIC. The energy efficiency (EE) of the proposed system is also analyzed for DL and DT modes.

中文翻译：

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电力线通信中具有不完美连续干扰消除功能的双向中继非正交多路访问

在本文中，我们研究了协作式非正交多址访问（NOMA）在电力线通信（PLC）中的应用，其中两个用户使用双向继电器（TWR）交换信息。在完美和不完美的连续干扰消除（SIC）的假设下，我们分析了受脉冲噪声影响的PLC对数正态通道的关键性能指标。特别是，对于延迟限制（DL）模式和延迟容忍（DT）模式，可以为用户中断概率和用户遍历率导出近似的封闭式表达式。通过蒙特卡洛模拟验证了分析结果。与传统的正交多址接入（OMA）方案相比，仿真结果表明，我们提出的NOMA TWR在低信噪比（SNR）区域提高了用户中断概率和用户遍历速率性能。但是，随着不完美SIC误差的增加，增益会减小，并且超出一定程度的不完美SIC则不存在。此外，通过优化功率分配系数来最大化系统性能，其中在存在不完善的SIC的情况下，分别显示在DL和DT操作中NOMA TWR网络的系统吞吐量和遍历总速率接近上限。还针对DL和DT模式分析了所提出系统的能效（EE）。图中显示了在SIC不完善的情况下接近天花板的情况。还针对DL和DT模式分析了所提出系统的能效（EE）。图中显示了在SIC不完善的情况下接近天花板的情况。还针对DL和DT模式分析了所提出系统的能效（EE）。