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Non-orthogonal multiple access (NOMA) technique has sparked a growingresearch interest due to its ability to enhance the overall spectral efficiencyof wireless systems. In this paper, we investigate the pairwise errorprobability (PEP) performance of conventional NOMA systems, where an exactclosed form expression for the PEP is derived for different users, to give someinsight about the reliability of the far and near users. Through the derivationof PEP expressions, we demonstrate that the maximum achievable diversity orderis proportional to the user's order. The obtained error probability expressionsare used to formulate an optimization problem that minimizes the overall biterror rate (BER) under power and error rate threshold constrains. The derivedanalytical results, corroborated by Monte Carlo simulations, are presented toshow the diversity order and error rate performance of each individual user.

On the Performance of Non-Orthogonal Multiple Access Systems with Imperfect Successive Interference Cancellation