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Table 5 SNR threshold for rate adaptation (for a message consisting of 4800 symbols).

From: Full Rate Network Coding via Nesting Modulation Constellations

SNR (dB) Modulation and coding Bit/Sym
  BPSK (1/2) 0.50
≥7.0 BPSK (3/4) 0.75
≥7.6 QPSK (1/2) 1.00
≥10.4 QPSK (3/4) 1.50
≥12.8 16 QAM (1/2) 2.00
≥17.0 16 QAM (3/4) 3.00
≥21.0 64 QAM (2/3) 4.00
≥23.4 64 QAM (3/4) 4.50
≥26.8 256 QAM (2/3) 5.33
≥28.0 256 QAM (3/4) 6.00