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Table 2 QPSK alphabet

From: Successive interference cancelation and MAP decoding for mobile MIMO OFDM systems and their convergence behavior

  1 2 3 4
(m 0,m 1) (0,0) (1,0) (0,1) (1,1)
η i 1 + j 1 2 n T 1 + j 1 2 n T 1 j 1 2 n T 1 j 1 2 n T