A Review of Recent Developments in NOMA & SCMA Schemes for 5G Technology

The race for developing 5G technology has taken a multiorganizational competition in the recent past, where the professional bodies, private organizations, and research units are carrying out research in developing various technologies relating to 5G. Multiple Access Scheme is one of the most important aspects that have been an area of interest for the majority as 5G is expected to accommodate large number of users with high speed of data transmission. This paper review the latest developments in the field of research concerning Sparse code multiple access (SCMA) and Non-orthogonal multiple access (NOMA). Ann extensive research has been carried out to identify the recent developments and their results are presented in this paper. This study has found that most of the recent developments in SCMA were focusing on achieving lower complexity levels, low BER, and effective and efficient energy utilization, and the recent developments identified regarding NOMA focused especially on the performance attributes like spectral efficiency, spatial efficiency, low BER and latency, and resource allocation and multiple access.