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In this paper, we investigate energy-efficient power allocation for thedownlink of the massive multiple-input multiple-output (MIMO) non-orthogonalmultiple access (NOMA) systems. In our proposed scheme, we divide a cell intotwo zones. The first area is for users whose distance from the base station(BS) is less than half of the radius of cell and the second area is for userswhose distance from BS is more than half of the radius of cell. Based ondistance of users from BS and the number of users in each area, we dedicate anamount of power for each user. We also use standard interference function (SIF)to propose a new iterative algorithm to solve the optimization problem andobtain the optimal power allocation scheme. Simulation results show that theproposed algorithm outperforms other algorithms from the energy efficiency (EE)point of view.

Energy Efficient Power Allocation in Massive MIMO NOMA Systems Based on SIF Using Cell Division Technique