| 摘要: |
| 具有非规则重复积累结构的低密度奇偶校验(IRA-LDPC)码是一种编码简单、性能优异的信道编码方法。陷阱集是影响码字性能的重要因素，尤其是基本陷阱集。为了进一步提高IRA-LDPC码的纠错性能，针对该码校验矩阵的特殊结构，分析了基本陷阱集的分布特点，提出了一种陷阱集优化的IRA-LDPC码构造方法，该方法依据码字结构特点对基本陷阱集进行了搜索和消除，降低了错误平层。仿真结果显示，优化后的0.5码率、1 024码长的码字在加性高斯白噪声信道下2.2 dB时误码率便达到10-7。 |
| 关键词: 低密度奇偶校验码 非规则重复积累 基本陷阱集 校验矩阵 |
| DOI： |
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| 基金项目:综合业务网理论及关键技术国家重点实验室（西安电子科技大学）开放研究课题（INS-15-13） |
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| Construction of IRA-LDPC codes with elementary trapping sets optimized |
| SUN Kangning,MA Linhua,HU Xing |
| () |
| Abstract: |
| Irregular repeat accumulate low-density-parity-check(IRA-LDPC) codes have low encoding-complexity and good performance in correcting errors. Trapping sets are key factors to the performance of the codes,especially the elementary trapping sets. In order to improve the error-correcting capacity,according to the characteristic of the structure for parity matrix,the distribution of elementary trapping sets is analyzed,and a construction method of IRA-LDPC codes is proposed. This method based on the construction of the codes can search and eliminate the elementary trapping sets,which lowers the error-floor. As can be seen from the simulation,the bit error rate(BER) reaches 10-7 at 2.2 dB with optimized IRA-LDPC codes with 1 024 code-length and 0.5 code-rate in additive white Gaussian noise(AWGN) channel. |
| Key words: LDPC codes irregular repeat accumulate elementary trapping sets parity-check matrix |
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