Classification of NOMA Schemes

Recently various non-orthogonal multiple access (NOMA) schemes have been proposed for 5G and 6G communication systems. Although there are a number of publications devoted to NOMA classification, general NOMA systems classification approach is not fully developed. The purpose of this report is to make common classification of various NOMA schemes and to propose new generalized model of NOMA signals for the further optimization of communication systems using NOMA technologies. Such new classification approach allows deeper analysis of NOMA characteristics, as well as developing NOMA theory in order to optimize and further improve such communication systems.