Abstract
This paper analyzes the power optimization for a downlink multi-input single-output non orthogonal multiple access (MISO-NOMA) system. Power coefficients are optimized in order to maximize the sum throughput of the system users based on the total transmitted power and Quality of service (QoS) constraints. First, we formulate a simple expression for Signal to interference noise ratio (SINR) for each user in MISO-NOMA system, then an analysis for the optimization problem and the considered constraints to prove the concavity of the objective function is presented. Lagrange function and Karush-Kuhn–Tucker (KKT) optimality conditions are utilized to derive the optimal power coefficients. Simulations are conducted and optimization solver is used to investigate the improvement achieved when power coefficients are optimized compared to fixed power scheme. Simulation results are conducted in terms of sum-rate, outage probability, SIC error and users’ individual rates. Results revealed that optimized power scheme is more satisfactory than fixed power scheme for far user than near user and both schemes are superior compared to conventional orthogonal multiple access (OMA) scheme.
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