(a) The BER performance of CN-based QC-GC-LDPC codes over AWGN channel. The BER can reach 10^–7 using the Belief-propagation decoding algorithm. (b) The FER performance of CN-based QC-GC-LDPC codes over AWGN channel. The FER can reach 10^–3 using the Belief-propagation decoding algorithm. (c) The performance of BER for different iterations. This figure shows the BER with 75, 35, and 15 iterations. As the number of iterations increases in the reverse reconciliation, the BER is more accurate. (d) The performance of FER under different iterations. This figure shows the FER with 75, 35, and 15 iterations. As the number of iterations increase in the reverse reconciliation, the FER is more accurate.