一种提高Turbo极化码译码性能的方法

A method to improve the performance of Turbo polar codes

针对Turbo极化码译码可能存在某些比特位无法将候选码集分为两个集合的问题,改进LiuZ等采用软串行抵消列表算法进行极化译码的处理方法,采用可估计的外部软信息绝对值的均值作为比特的外部软信息绝对值,并在外部信息输入到下个阶段迭代前,利用乘性因子对外部信息的作用进行控制.仿真结果表明,改进后的Turbo极化码译码方法,在块错误率为10-3处性能提高了0.2dB以上.

Since some bits do not have two sets obtained from the candidate codeword set to estimate their external soft information in the decoders of Turbo polar decoding with successive cancellation list (SCL) decoding,a method is presented to improve the decoding performance in comparison with the work of Liu Z et al.In this method,the mean of absolute values of external soft information that can be estimated is used as the absolute value of external soft information for those bits whose external soft information cannot be estimated in each half-iteration.Besides this,the external soft information is tuned by multiplier factors to control the effect of external soft information before being input as the a priori soft information to the next half-iteration.The simulation results show that the performance with the proposed method can be improved more than 0.2 dB at the block error rate of 10-3 in comparison with Liu’s work.