It was found that the code length distribution was closely correlated with the shift symmetry properties of synchronized coding and was characterized by sequencing and non-integral power of 2.
研究发现：其码长分布与同步字的移位对称数密切相关，具有连续和非2的整数次幂等特点；
LDPC check matrix function claims that can be generated in accordance with the corresponding distribution check matrix, for a very long code length LDPC.
LDPC码校验矩阵声称函数，可以根据度分布生成相应的校验矩阵，适用于码长很长的LDPC。
Thirdly, loop was defined based on the characteristics of city high voltage distribution network. Tabu rule was presented in order to shorten the length of code.
第三，针对城市高压配电网的特点，定义了环路，并在此基础上提出了简化网路的禁忌规则，缩短了编码长度；
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