Performance Analysis and Design of MIMO Power NOMA With Estimated Parameters Error Statistics Along With SIC and Hardware Imperfections

In this work, we propose to design and subsequently analyze the performance of a power non-orthogonal multiple access (power-NOMA) system, having multiple input multiple output (MIMO) antennas with the consideration of various imperfection statistics. Three key issues emerge, while NOMA is in place. The first one is the user order mismatch due to estimated channel, which impacts the NOMA performance. The second one is the imperfect successive interference cancellation (SIC) at the receiver, which impacts the interference cancellation at the NOMA receiver. The third issue is the imperfection arising due to hardware circuits, which include fixed-pointed digital logic, analog and radio frequency (RF) circuits. To some extent, these issues have been addressed in bits and pieces in the context of single antenna power NOMA design, however they have not been addressed all together in the context of MIMO power NOMA. There are several key contributory aspects in this work. Key part is the exploitation of these parameter estimation error statistics along with the imperfections in transceiver hardware chains and SIC at the receiver. We propose a MIMO NOMA based on the maximum sum-rate criterion. An analytical framework has been presented in this regard. Numerical results demonstrate that the consideration of these error statistics improves the overall sum-rate performance.