| 摘要: |
| 针对DVB-S2（Digital Video Broadcasting-Satellite 2）标准低密度奇偶校验（LDPC）码的识别问题，提出了基于稀疏校验的快速识别方法。基于LDPC码编码矩阵的稀疏性，只有少量校验位和信息位有校验关系，因此只需要对少量的信息位进行校验即可。遍历不同的生成矩阵，并对多个码字的校验结果进行累积，通过对其校验累积量的分布特点实现不同码率LDPC码的识别。由于只采用了很少的信息位进行校验，因此算法计算量小，同时可以有效减少误码带来的影响。仿真结果表明所提算法有效且可以适应15%以上的误码，完全可以满足实际系统对LDPC码的检测需求。 |
| 关键词: DVB-S2 LDPC码 快速识别 稀疏校验 |
| DOI： |
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| 基金项目: |
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| Fast recognition of DVB-S2 LDPC codes based on sparse check |
| XIE Hui,YAO Zhigang,CHEN Guanyi,YIN Yuanwei,LYU Meng |
| (Department of Electronic and Optics Engineering,Army Engineering University Shijiazhuang Campus,Shijiazhuang 050003,China) |
| Abstract: |
| For the recognition of Digital Video Broadcasting-Satellite 2(DVB-S2) Low- Density Parity –Check(LDPC) codes,a fast recognition algorithm based on sparse check is proposed.Based on the sparse coding matrix,only a few of check codes and information codes have check relations,so the algorithm only needs a few codes.Different coding matrixes are traversed,and the cumulant of the check result is calculated.The LDPC codes can be recognized according to the distribution characteristics of the cumulant.Because only a few codes are needed,the algorithm has less amount of calculation,and can overcome the impact of error codes.Simulation result proves the effectiveness of the algorithm with tolerance of above 15% error codes and it can fully meet the detection requirements of the actual system on LDPC codes. |
| Key words: DVB-S2 LDPC code fast recognition sparse check |
