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中文摘要：
基于SCG（4,k）码的构造方法提出了一种改进的新颖低密度奇偶校验（LDPC）码构造方法,该方法比改进前的SCG（4,k）码构造方法在硬件实现方面具有节省存储空间和降低计算复杂度的优点。采用该方法构造了冗余度为5.42%的LDPC（5929,5624）码,仿真分析表明,该码型比已广泛用于光通信系统中的经典RS（255,239）码具有更好的纠错性能与较低的译码复杂度。
英文摘要：
A modified construction method of LDPC codes, based on the construction method of SCG （4, k） codes, is proposed. Compared with the traditional method, this novel method has such advantages as saving storage space and reducing computation complexity in the hardware realization. LDPC（5929,5624） codes were constructed with a redundancy of 5.42% by using this method. Simulation analysis shows that this novel code has better error-correction performance and lower decoding complexity than classic RS （255, 239） code that has been extensively applied in optical communication systems.
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