局部概率传播译码的非系统低密度卷积码

低密度卷积码(LDCC)是低密度码(LDPC)经由其产生矩阵的侧滑变换成为带状产生矩阵而得到的,具有LDPC和卷积码的误码性能好等一些共同特征。LDCC码的和积算法译码方法可以进一步改进为局部概率传播译码方法。采用流水线结构的局部概率传播译码方法用于LDCC码得到了接近和积算法的译码性能,而且译码延迟比LDPC大为降低,译码器更为简单,便于实时工作。

A Non-systematic Low Density Convolution Codes with Local Probabilistic propagation Decoding

Low density convolution codes (LDCC) are generated from the low density parity-check codes (LDPC) through a shift transform of the LDPC generating matrix into a band generating matrix, and share the benefit of lower bit error rate (BER) with other convolution codes. This article shows that the sum-product decoding algorithm for the LDCC can be improved with a local probabilistic propagation algorithm. A pipeline implementation is proposed. With this implementation, the local probabilistic propagation decoding algorithm, when applied to the LDCC case, obtains performance near to that of the sum-product decoding, whilst its decoding latency is significantly decreased, its decoder simplified and runs fast.