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Table 4 Potential SNR loss in constellation conversion.

From: Full Rate Network Coding via Nesting Modulation Constellations

  BPSK QPSK 16 QAM 64 QAM
QPSK 0    
16 QAM −0.97 dB −0.97 dB   
64 QAM −1.18 dB −1.18 dB −0.21 dB  
256 QAM −1.23 dB −1.23 dB −0.26 dB −0.05 dB