QC-LDPC codes constructed by circulant permutation matrices will lead to inevitable cycles, named balanced-cycles.
在用循环置换矩阵构造准循环LDPC码时会出现一类无法消除的环，称为平衡环。
Three encoder circuit are designed respectively with feed shift-registers and logic gates: SRAA-based serial QC-LDPC encoder;
采用反馈移位寄存器与逻辑门设计了三个典型的编码器电路：基于SRAA电路的串行准循环LDPC码编码器；
Quantization decoding of QC-LDPC codes is studied. We simulated the decoding performance which is affected by quantitative precision and the scope of quantization.
研究了QC-LDPC码的量化译码，针对高速率的光纤通信系统，仿真验证了量化范围和量化精度的对译码性能的影响。
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