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A Method of Counting the Number of Cycles in LDPC Codes

机译:LDPC码中周期数的计数方法

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For a given block length sequences of the underlying Tanner graph (TG), the short circles of low-density parity check (LDPC) codes can have considerable variation in performance. By analyzing the shapes of the cycles of TG in parity check matrix, this paper presents a method of counting the number of 4-cycles, 6-cycles, 8-cycles and 10-cycles. Taking out a certain number of rows for different cycles, counting the number of cycles contained in these rows, then adding up all the number of cycles that contained in all possible combinations of the rows in the matrix, and we can get the number of cycles in the matrix. This method can be used effectively to evaluate the performance of LDPC codes according to their short circles distributions. Applying this method, we counting the number of cycles in the random LDPC codes and the quasi-cyclic LDPC codes, the BER performance shows that the random LDPC codes outperform the quasi-cyclic LDPC codes although their girth performance is not as good as the quasi-cyclic LDPC codes.
机译:对于基础Tanner图(TG)的给定块长度序列,低密度奇偶校验(LDPC)码的短圈可能会在性能上产生很大的差异。通过分析奇偶校验矩阵中TG的周期形状,提出了一种计算4周期,6周期,8周期和10周期数的方法。取出不同周期的一定数量的行,计算这些行中包含的周期数,然后将矩阵中所有行的所有可能组合中包含的所有周期数相加,我们可以得到周期数在矩阵中。该方法可以有效地根据LDPC码的短圆分布来评估其性能。应用此方法,我们计算了随机LDPC码和准循环LDPC码的周期数,BER性能表明,尽管随机LDPC码的周长性能不如准LDPC码,但其性能优于准循环LDPC码。 -循环LDPC码。

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