并行级联分组码比串行级联分组码具有更高的码率,基于LLR计算的Turbo迭代译码算法使其内外分量码均做到了软判决译码。通过引入校正因子a(m),将接收信息与子译码器的输出软信息进行线性叠加反馈能在省去繁琐的LLR计算的情况下实现并行级联分组码的Turbo迭代译码。仿真研究表明,若将译码器的输出进行简单的相关运算,可进一步改善译码器性能。 Parallel concatenated block codes have higher bit rates than serial concatenated block codes. The Turbo iterative decoding algorithm based on LLR makes soft decision decoding both inside and outside the component codes. By introducing the correction factor a (m), the linear superposition feedback of the received information and the output soft information of the sub-decoder can realize the Turbo iterative decoding of the parallel concatenated block code without the cumbersome calculation of LLR. Simulation studies show that the performance of the decoder can be further improved if the output of the decoder is simply correlated.