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。

Quantization decoding of QC-LDPC codes is studied. We simulated the decoding performance which is affected by quantitative precision and the scope of quantization.

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为降低低密度奇偶检验码译码的硬件实现复杂度，提出了一种可变步长均匀量化“和积”译码算法。

A variable step uniform quantization(VSUQ) sum-product algorithm(SPA) was developed to reduce the hardware complexity of low-density parity-check(LDPC) code decoding.

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最后，针对实现级联码译码量化实现，提出了一种基于SDR的双目标规划设计算法。

Finally, a scheme using the double objects programming based on SDR is purposed, and applied to the given concatenated code.

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