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Table 1 Related research status, problems, and this paper’s contribution

From: Interleaved block subcarrier allocation and power combination for frequency symbol spreading multiuser diversity OFDMA

Method Interleaved allocation Flexibility MUDiv gain Computational complexity
Ref. [15] X X O Large
Refs. [16, 18, 21, 22] X O O Small to large
Refs. [11,12,13] O O X Small
Refs. [17, 19] O O O Large
Ref. [20] O X O Small
Refs. [23, 24] X O X Small
Proposed method O O O Small