Low Complexity NOMA Systems Based on Combinatorial Designs

In this paper, the sparse pattern of Balanced Incomplete Block Designs (BIBDs) combinatorial designs for non-orthogonal multiple access is studied. This combinatorial design supplies an inherent mapping for NOMA systems. We use a bijective mapping method at the transmitter to avoid the constellation overlapping and linearly combined the data of multiusers over the resource. These NOMA designs can manage larger number of users with moderate increases in complexity.