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中文摘要：
提出了一种新的准循环低密度奇偶校验（QC-LDPC）码的构造方法,给出了用该方法构造无环四QC-LDPC码的充分条件。并针对光通信系统的传输特点,用此方法构造了适用于高速长距离光通信系统的QC-LDPC（4 221,3 956）码。仿真结果分析表明：在码率为93.7%、误码率BER为10-6时,与广泛用于光通信系统中的经典RS（255,239）码相比,其净编码增益（NCG）提高了约1.8dB;比SCG-LDPC（3 969,3 720）码的NCG提高了约0.2dB,距离香农极限约1.4dB,且远低于PEG-LDPC（4 221,3 956）码的错误平层,这正满足光通信系统中低错误平层的要求。
英文摘要：
A novel construction method of quasi-cyclic low-density parity-Ccheck（QC-LDPC） codes is proposed.A sufficient condition of the construction approach for QC-LDPC codes without girth-four is presented.Considering the characteristics of optical communication systems,a QC-LDPC（4 221,3 956） code for high-speed long-haul optical communication system,based on the proposed method is constructed.The analysis of the simulation result shows that the net coding gain（NCG） of the QC-LDPC（4 221,3 956） code is 1.8 dB and 0.2 dB more than that of the classic RS（255,239） code and SCG-LDPC（3 969,3 720） code respectively at code rate of 93.7% and BER of 10-6.And at the same condition,the NCG of the QC-LDPC（4 221,3 956） code is about 1.4 dB away from the Shannon limit.Furthermore,the error floor of QC-LDPC（4 221,3 956） code is far lower than that of the PEG-LDPC（4 221,3 956） code,which just meets the requirement of optical communication systems.
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