利用编码方法搜求Turbo乘积码译码中的候选码字,对由单纠错能力分组码作为子码的乘积码进行仿真,考察不等数量的候选码字对译码性能的影响,并对两种估计无竞争码字比特外部信息值的方式在利用编码方法及Chase—II算法搜求候选码字时所形成的性能差异进行分析。
Encoding method is used to find candidate codewords in turbo decoding of product codes, and performance of product codes built with single-error-correcting block codes is provided. The effect on performance is studied when the number of candidate codewords is different. The difference between two met in estimating the extrinsic information of those bits without compete codewords is analyzed when the enco method or Chase-II algorithm is used.