Performance Analysis of Hybrid NOMA-OMA Scheme for 5G NR System

The non-orthogonal multiple access (NOMA) scheme has been considered as a study item in 3rd generation partnership project (3GPP) for its possible use in fifth-generation new radio (5G NR) and beyond. In this paper, we explore the available scalable bandwidth feature of 5G NR and propose a hybrid NOMA-OMA scheme based downlink data transmission in 5G NR. The hybrid NOMA-OMA based seamless data transmission over the same 5G NR frame is carried out with help of different numerology factor which indirectly controls the subcarrier spacing, without affecting the conventional OMA based transmission. Performance of the proposed method in conventional 5G NR system is analyzed in terms of the average bit error rate (BER) and ergodic capacity performance for various modulation schemes. The results are illustrated for different μ used in 5G NR specifications. Moreover, the obtained results are corroborated with the analytically obtained expressions.