Abstract

In this paper, a combination system of multi-antenna multiple input multiple output (MIMO) and non-orthogonal multiple access (NOMA) technologies is investigated, in which the source communicates with users using a multiple amplify-and-forward (AF) relaying network. These relay nodes are equipped with a single antenna and employ a power-splitting protocol to harvest energy from received signals, whereas the source and users are multiple-antenna nodes. In addition, two antenna-relay selection methods are considered to enhance the harvested energy at the relay including the maximum ratio transmission (MRT) and transmit antenna selection (TAS) at the source, with maximal-ratio combining at the users, these methods are compared to the performance of the random selection (RS) scheme. To evaluate the performance of the proposed system, we derive analytical expressions of the outage probability and throughput for the MRT and TAS schemes over Rayleigh fading channels, and use a Monte Carlo simulation to verify the accuracy of the analytical results. The results demonstrate the benefit of using MRT and TAS schemes, which provide a better performance than RS schemes, in a MIMO/NOMA system. Moreover, these results characterize the effects of various system parameters, such as power allocation factors, the numbers of antenna and relay nodes, power-splitting ratio, successive interference cancellation and energy-harvesting efficiency, on the system performance of two users of MIMO/NOMA. This is further compared with multiple-antenna conventional orthogonal multiple access (MIMO/OMA) schemes.

中文翻译：

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瑞利衰落下协作MIMO / NOMA网络中的能量收集中继天线选择

摘要

本文研究了一种多天线多输入多输出（MIMO）和非正交多址（NOMA）技术的组合系统，该系统中的源使用多个放大转发（AF）中继与用户进行通信网络。这些中继节点配备有单个天线，并采用功率分解协议从接收到的信号中收集能量，而源和用户则是多天线节点。此外，还考虑了两种天线中继选择方法来增强中继站的能量收集，包括源处的最大比率传输（MRT）和发射天线选择（TAS），并在用户处实现最大比率组合，这些方法是与随机选择（RS）方案的性能相比。为了评估建议系统的性能，我们推导了瑞利衰落信道上MRT和TAS方案的中断概率和吞吐量的解析表达式，并使用蒙特卡罗模拟来验证分析结果的准确性。结果证明了在MIMO / NOMA系统中使用MRT和TAS方案的好处，它们比RS方案提供更好的性能。此外，这些结果还表征了各种系统参数的影响，例如功率分配因子，天线和中继节点的数量，功率分配比，连续的干扰消除和能量收集效率，对MIMO /两个用户的系统性能的影响。诺玛 进一步将其与多天线常规正交多址访问（MIMO / OMA）方案进行比较。