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Low-complexity soft-decision feedback turbo equalization for multilevel modulations

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Table 1. Symbol alphabets. BPSK: i 1 2 s i,1 0 1 α i +1 −1 QPSK: i 1 2 3 4 s i,1 s i,2 00 01 10 11 α i (+1 + i)/ √ 2 (+1 − i)/ √ 2 ( −1 + i)/ √ 2 ( −1 − i)/ √ 2 8PSK: i 1 2 3 4 5 6 7 8
Figure 2. Soft-decision feedback turbo equalizer.
Figure 5. BER of a MAX-Log-MAP decoder as a function of ID i .
Figure 6. EXIT chart of turbo equalizer at 5 dB SNR for BPSK.
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