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对于任意行重L,利用完全确定的方式构造出一类围长为8的(3,L)-LDPC码作为分量码1,构造可快速编码的LDPC码作为分量码2,利用分量码1和分量码2,并结合中国剩余定理(CRT)构造出一类围长至少为8的合成QC-LDPC码。该方法构造出来的码字同时具备以上两种的特性。仿真结果表明,本文所构造的码字性能与基于IRCMS算法构造的QC-LDPC码相比,有略微提升,且具有快速编码特性,编码复杂度更低;与具有双对角结构的阵列码相比,性能有了明显提升。在误码率达到10-4时,码字性能大约提高了0.3dB;与PEG-CRT-LDPC码相比,所构造的码字在低编码复杂度的基础上性能有所提升。
For any line weight L, we construct a class of (3, L) -LDPC codes with a circumference of 8 as the component code 1 in a completely deterministic way and construct a fast-coded LDPC code as the component code 2, Component code 2, combined with China’s residual theorem (CRT) to construct a class of synthesis QC-LDPC codes with a circumference of at least 8. The codeword constructed by this method possesses the above two characteristics at the same time. The simulation results show that the performance of the proposed codeword is slightly higher than that of the QC-LDPC code based on the IRCMS algorithm, and has the characteristics of fast coding and lower coding complexity. Compared with the code array with double diagonal structure Than the performance has been significantly improved. Compared with the PEG-CRT-LDPC codes, the constructed codewords have improved the performance based on the low coding complexity when the bit error rate reaches 10-4.