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Table 1 Constellation conversion from 16 QAM to QPSK ( represents the a priori info, are the info bits to be received).

From: Full Rate Network Coding via Nesting Modulation Constellations

a priori info QPSK constellation ()
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111