论文部分内容阅读
In this paper, proportional faess (PF)-based energy-efficient power allocation is studied for multiple-input multiple-output (MIMO) non-orthogonal multiple access (NOMA) systems. In our schemes, statistical channel state information (CSI) is utilized for perfect CSI is impossible to achieve in prac-tice. PF is used to balance the transmission efficiency and user faess. Energy efficiency (EE) is formulated under basic data rate re-quirements and maximum transmitting power constraints. Due to the non-convex nature of EE, a two-step algorithm is proposed to obtain sub-optimal solution with a low complexity. Firstly, power allocation is determined by golden section search for fixed power. Second-ly total transmitting power is determined by fractional programming method in the feasible regions. Compared to the performance of MI-MO-NOMA without PF constraint, faess is obtained at expense of decreasing of EE.