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。

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Based on the suitable channel model, an implementation of quasi-cyclic low density parity check codes (QC-LDPC) for acoustic communication system in shallow water is demonstrated.

讨论了准循环低密度校验码(QC - LDPC)在浅海水声信道中的实现方案。

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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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