In this work we deal with the performance analysis of a cell-edge user with the precoder and equalizer design in a two-user cooperative multiple-input multiple-output non-orthogonal multiple access (MIMO-NOMA) system. Since the data rate fairness and outage performance of cell-edge user are crucial issues in MIMO-NOMA systems, we emphasize on how to sort out these issues. To this end, the coefficients of power allocation are updated with the help of beamformers by utilizing the simultaneous wireless information and power transfer (SWIPT) protocol. Particularly, a user at the cell-center plays the role of a relay to help the cell-edge user and the relaying operation is powered by a hybrid time switching/power splitting SWIPT protocol. For this purpose, first we formulate the signal-to-interference-plus noise ratio of downlink MIMO-NOMA system by considering distinct correlation matrices in term of indefinite eigenvalues by utilizing a quadratic formulation in the presence of both self-interference and multi-user interference. Next, a closed-form expression of the outage probability is derived based on the knowledge of receive and transmit correlation matrices at the transmitter side. The analytical expressions are validated through simulations to affirm the accuracy of our analysis. We showcase the extent by which the cell-edge user’s outage performance is improved by using the antenna diversity at near and far end terminals of the MIMO-NOMA system.

在这项工作中，我们在双用户协作多输入多输出非正交多址 (MIMO-NOMA) 系统中使用预编码器和均衡器设计处理小区边缘用户的性能分析。由于小区边缘用户的数据速率公平性和中断性能是 MIMO-NOMA 系统中的关键问题，因此我们重点讨论如何解决这些问题。为此，通过利用同步无线信息和功率传输 (SWIPT) 协议，在波束成形器的帮助下更新功率分配系数。特别地，小区中心的用户扮演中继的角色，帮助小区边缘的用户，中继操作由混合时间切换/功率分配SWIPT协议供电。以此目的，首先，我们通过在存在自干扰和多用户干扰的情况下利用二次公式考虑不定特征值方面的不同相关矩阵来制定下行链路 MIMO-NOMA 系统的信干噪比。接下来，基于发射机侧接收和发射相关矩阵的知识，推导出中断概率的闭合形式表达式。分析表达式通过模拟验证，以确认我们分析的准确性。我们展示了通过在 MIMO-NOMA 系统的近端和远端终端使用天线分集来提高小区边缘用户中断性能的程度。