Turbo码并行译码中无冲突交织器设计方案

交织器的结构可以影响到Turbo码的最小码距,进而影响其编码增益,最终对误比特率产生较大影响。交织器的主要功能就是随机化输入信息码序列,并让两个子编码模块在任何时刻,不会同时输出码重较轻的码字。交织器的随机性直接影响着Turbo码并行译码性能,针对现有无冲突交织器中随机性较小的特点,引入行内、行间交织等处理方式,进一步增加了交织表的随机性,以此提高Turbo码并行译码的性能,并给出了行内、行间交织设计实例。

Design of Collision-free Interleaver in Parallel Turbo Decoding

The dstructure of interleaver could have influence on minimum distance of Turbo code, further on its encoding gain, and finally on its BER. The interleaver principally randomizes the input code array and makes the two coding modules not output the light-weight codes at any time. The randomness of interleaver has direct impacts on the performance of Turbo decoder. This paper focuses on low randomness of the existing collision-free interleaver, and proposes intraline interleaving and interline interleaving, thus to improve the randomness of interleaving table and raise the performance of parallel decoding. The paper also gives some examples in the design of intraline of interline interleaver.