一种适用于大数逻辑可译LDPC码的自适应译码算法

摘要

Majority-logic decodable low-density parity check( LDPC) codes have large column weight. For these special LDPC codes,a low complexity adaptive decoding algorithm based on the integer reliabilities is proposed. In the process of decoding,different adaptive scaling factor is introduced for each check node to modify the extrinsic information. Simulation results show that the performance of the adaptive decoding algo-rithm is almost the same as that of the sum-product algorithm( SPA) and there is only 0. 1 dB difference between two decoding algorithms when the bit error rate( BER) is about 10-5 . Featured by low complexity, parallel computation and integer information,the proposed adaptive decoding algorithm is very easy to be realized in practice.%大数逻辑可译低密度奇偶校验( LDPC)码是一类具有较大列重的码，针对此类特殊的LDPC码，提出了一种基于整数可靠度的低复杂度自适应译码算法。在译码的过程中，算法对每个校验节点分别引入不同的自适应修正因子对外信息进行修正。仿真表明提出的自适应译码算法的性能与和积译码算法的性能相当，在误码率(BER)约为10-5时两种算法性能之间仅有0.1 dB的差异。所提算法具有复杂度低、可并行操作、全整数的信息传递等优点，十分有利于工程实现。