摘要
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 improved ARA code is constructed without small-cycles. The technology is to concatenate two RA codes and design the parity check matrix. The jointly designed codes can not only break the 4-cycles but also increase the flexibility in choosing degree distributions. Degree distribution is optimized by adopting EXIT chart technology for the improved codes. Simulation result indicates that the codes of middle length have lower error floor relative to ARA codes with the decoder of BP algorithms.
出处
《通信技术》
2007年第7期36-38,共3页
Communications Technology
基金
东南大学移动通信国家重点实验室开放课题基金资助项目(N200607)
国家自然科学基金资助项目(60602008)
