As a new joint source-channel coding scheme, the double polar (D-Polar) codes have been proposed recently. In this letter, a novel joint source-channel decoder, namely the joint successive cancellation list (J-SCL) decoder, is proposed to improve the decoding performance of the D-Polar codes. We merge the trellis of the source polar code and that of the channel polar code to construct a compound trellis. In this compound trellis, the joint source-channel nodes represent both of the information bits and the high-entropy bits. Based on the compound trellis, the J-SCL decoder is designed to recover the source messages by combining the source SCL decoding and channel SCL decoding. The J-SCL decoder doubles the number of the decoding paths at each decoding level and then reserves the L paths with the smallest joint path-metric (JPM). For the JSC node, the JPM is updated considering both the channel decision log-likelihood ratios (LLRs) and the source decision LLRs. Simulation results show that the J-SCL decoder outperforms the turbo-like BP (TL-BP) decoder with lower complexity.

翻译：作为新的联合源-通道编码办法,最近提出了双极(D-Polar)代码。在本信中,为了改进D-Pollar代码的解码性能,提出了一个新的双极(D-Polar)代码。作为新的联合源-通道编码办法,提出了一个新的双极(D-Polar)代码,即新的联合源-通道解码器(J-SCL)解码器(J-SCL)解码器(J-SCL-SCL)解码器(J-Pollar)解码器(J-SCL),目的是通过将源(SCL-PL)解码和 SCCL解码(L)解码器(JL-PR)合并,然后将L路径与最小的联合路径测量(JPM(JCndede)一道保留。关于JPM(JC-PM)的混合源决定(JMM)和Simdro-L(Ls)显示JCD-L-R(Lximmodal-BC-DL) 和SimmodL(L)结果。