一种带辅助译码比特的Polar码译码方法

在传统的Polar码译码的基础上，引入辅助译码比特，构造了一个辅助的Polar码字以提高译码性能。辅助比特由信道选择辅助窗口内的信息位决定。接收端如译码失败，将进行二次译码尝试。译码方案分两阶段进行：基于相同结构的扩展生成矩阵，将辅助译码比特译出；结合译出的辅助比特，对原码字进行译码，提高译码成功率。仿真结果显示，使用所提方法进行译码，其译码性能明显优于普通串行抵消译码方法；与两种传统的自动重传请求方案相比，能分别获得1 dB和1.9 dB的性能增益。

A Polar Code Decoding Method with Auxiliary Decoding Bits

Based on the traditional decoding method of Polar code,special auxiliary decoding bits along with the auxiliary polar code are introduced to improve decoding performance.Auxiliary bits can be obtained by choosing the message bits locating in the auxiliary window.If the decoding fails,a second decoding attempt will be executed.The second decoding can be divided into two stages:based on extended generator matrix,the auxiliary bits is decoded first;the original codeword is decoded by using the decoding result of auxiliary bits to improve decoding performance.Simulation result shows that,the proposed decoding method outperforms the traditional successive cancellation(SC) decoding method.Compared with two different automatic repeat request(ARQ) schemes,the proposed method can obtain 1 dB and 1.9 dB performance gains,respectively.