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Non‐orthogonal multiple‐access (NOMA) scheme using massive multiple‐input multiple‐output (MIMO) transmission suffers from interference between users. In this paper, we propose a novel MIMO‐NOMA framework based on space–time block code (STBC) to decrease the multiple‐access interference (MAI), when the number of users is increasing. In this paper, besides giving an analysis of network, cluster, group,...