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Table 1 Comparison of different strategies

From: Rate-splitting multiple access for downlink communication systems: bridging, generalizing, and outperforming SDMA and NOMA

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