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在传统的卫星广播系统中,信道纠错通常采用BCH码级联LDPC码的方案以达到良好的误码率性能,例如DVB-S2系统。作为内码的LDPC码通常采用迭代译码,且迭代次数较高才能实现比较好的系统性能。借助BCH级联LDPC的结构,文中提出了将BCH检错嵌套进LDPC每一次迭代译码过程中的新的迭代译码结构。仿真结果表明,新算法以较低的BCH码检错运算复杂度换取了LDPC码迭代次数的明显下降,从而极大降低了迭代译码总体复杂度和译码时延,且整体纠错性能与原始LDPC译码后BCH纠错的算法相比基本保持不变。
In traditional satellite broadcasting systems, channel error correction usually adopts the scheme of cascaded LDPC codes of BCH codes to achieve good bit error rate performance, such as DVB-S2 system. As the internal code of LDPC code iterative decoding is usually used, and the higher the number of iterations in order to achieve better system performance. With the structure of cascaded LDPC in BCH, a new iterative decoding structure is proposed in this paper. The simulation results show that the new algorithm uses the lower complexity of BCH code detection and retrieval in exchange for a significant decrease in the number of iterations of the LDPC code, thus greatly reducing the overall complexity and decoding delay of the iterative decoding, and the overall error correction performance and The original LDPC decoding BCH error correction algorithm compared to the basic remain unchanged.