Table 1 Comparison of different strategies
Multiple access | NOMA | SDMA | RSMA | |
|---|---|---|---|---|
Strategy | SC–SIC | SC–SIC per group | MU–LP | All forms of RS |
Design principle | Fully decode interference | Fully decode interference in each group and treat interference between groups as noise | Fully treat interference as noise | Partially decode interference and partially treat interference as noise |
Decoder architecture | SIC at receivers | SIC at receivers | Treat interference as noise | SIC at receivers |
User deployment scenario | Users experience aligned channel directions and a large disparity in channel strengths | Users in each group experience aligned channel directions and a large disparity in channel strengths. Users in different groups experience orthogonal channels | Users channels are (semi-)orthogonal with similar channel strengths | Any angle between channels and any disparity in channel strengths |
Network load | More suited to overloaded network | More suited to overloaded network | More suited to underloaded network | Suited to any network load |