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Table 1 Quantization parameters related to Fig. 5 in signed two’s complement representation

From: Efficient quantization and fixed-point representation for MIMO turbo-detection and turbo-demapping

Index Quantization Index Quantization
  64-QAM 16-QAM QPSK   64-QAM 16-QAM QPSK
i1 Q 4.8 Q 4.8 Q 4.8 i13 Q 8.8 Q 7.9 Q 3.13
i2 Q 5.7 Q 5.7 Q 5.7 i14 Q 8.8 Q 9.7 Q 6.10
i3 Q 6.6 Q 6.6 Q 6.6 i15 Q 8.8 Q 8.8 Q 8.8
i4 Q 2.8 Q 2.8 Q 2.8 i16 Q 2.14 Q 2.14 Q 2.14
i5 Q 3.7 Q 3.7 Q 2.8 i17 Q 1.15 Q 1.15 Q 1.15
i6 Q 4.12 Q 4.12 Q 4.12 i18 Q 2.14 Q 2.14 Q 1.15
i7 Q 6.10 Q 6.10 Q 6.10 i19 Q 4.12 Q 4.12 Q 3.13
i8 Q 5.11 Q 5.11 Q 5.11 i20 Q 4.6 Q 4.6 Q 4.6
i9 Q 6.10 Q 6.10 Q 6.10 i21 Q 1.9 Q 1.9 Q 1.9
i10 Q 2.14 Q 2.14 Q 2.14 i22 Q 4.12 Q 3.13 Q 2.14
i11 Q 3.13 Q 3.13 Q 2.14 i23 Q 4.12 Q 3.13 Q 2.14
i12 Q 6.10 Q 3.13 Q 1.15 i24 Q 4.12 Q 2.14 Q 1.15