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给出了一种无四环改进ARA码的设计方法。该方法采用级联两个RA码,并通过优化编码器来构建其奇偶校验矩阵。得到的码不仅能消除4环,而且具有更灵活的度分布。另外,采用EXIT技术对度分布进行了优化。研究结果显示,基于BP译码的中等长度的改进ARA码的错误平层比ARA码更低。
A design method of non-ring improved ARA code is given. This method cascades two RA codes and constructs its parity matrix by optimizing the encoder. The resulting code not only eliminates 4 loops, but also has a more flexible degree distribution. In addition, the use of EXIT technology to optimize the degree distribution. The results show that the average length of modified ARA codes based on BP decoding is lower than that of ARA codes.