  Non-orthogonal multiple access (NOMA) schemes are being considered in 5G new
radio developments and beyond. Although seminal papers demonstrated that NOMA
outperforms orthogonal access in terms of capacity and user fairness, the
majority of works have been devoted to the wireless terrestrial arena.
Therefore, it is worth to study how NOMA can be implemented in other types of
communications, as for instance the satellite ones, which are also part of the
5G infrastructure. Although communications through a satellite present a
different architecture than those in the wireless terrestrial links, NOMA can
be an important asset to improve their performance. This article introduces a
general overview of how NOMA can be applied to this different architecture. A
novel taxonomy is presented based on different multibeam transmission schemes
and guidelines that open new avenues for research in this topic are provided.
