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基于LDPC码,提出一种新颖的随机交织型级联码(RICC,random interleaved concatenatedcode)方案。在编码阶段,根据LDPC码中不同度数的变量节点采用不同纠错能力的BCH外码,分别进行保护的思想进行集分割编码;在译码阶段,采用硬判决辅助软判决的联合迭代译码。不同于传统的单极型和交织型级联方式,它是一种根据LDPC码变量节点(VN)度数来决定交织深度,因而交织方式是随机的。仿真结果分析表明,在误比特率(BER)为10-8时,四集合分割的RICC-4P的净编码增益(NCG)比无分割的单级型级联码提高了0.15dB,比ITU-T G.709和G.975.1标准中的RS(255,239)、RS(255,239)+CSOC(n/k=7/6,J=8)级联码和开销为25%的正交级联BCH码的NCG分别提高了3.0、1.5和0.4dB,其纠错性能的提升得益于采用集分割保护和硬判决辅助软判决的联合迭代译码。
Based on LDPC codes, a novel random interleaved concatenated code (RICC) scheme is proposed. In the coding stage, according to the different degree of variable nodes in LDPC code using different error correction ability of BCH outer code, respectively, for the protection of the idea of set partitioning coding; in the decoding phase, the hard decision auxiliary soft decision joint iterative decoding. Unlike traditional unipolar and interleaved cascading methods, which are based on the LDPC code variable node (VN) degree to determine the interleaving depth, so the interleaving method is random. The simulation results show that the net encoding gain (NCG) of RICC-4P with four-set segmentation is 0.15dB higher than that of the un-splitting single-level concatenated code at bit error rate (BER) RS (255,239), RS (255,239) + CSOC (n / k = 7/6, J = 8) concatenated codes and orthogonal concatenated BCH codes with 25% overhead in the T G.709 and G.975.1 standards Of the NCG increased by 3.0, 1.5 and 0.4dB, respectively. The improvement of the error correction performance is due to the joint iterative decoding using set-division protection and hard-decision assisted soft decision.