SCMA与极化码的联合检测译码技术

将极化码与SCMA多址系统相结合，并针对传统的独立检测译码方案（independent detection and decoding，IDD）因缺乏对译码输出信息的再利用而导致系统性能不佳的问题，提出了SCMA以及极化码联合检测译码方案（joint detection and decoding，JDD）。该方案在接收端借助译码获得的内信息辅助更新SCMA多用户检测器的初始先验信息，在检测器与译码器之间实现软信息的回溯迭代，从而得到更显著的系统性能增益。仿真结果表明采用了JDD方案的系统性能相比IDD方案得到了显著的提升，误码率相较IDD方案提升了大约2 dB。

Joint detection and decoding scheme for SCMA system with polar codes

This paper combined the SCMA and polar codes and proposed a joint SCMA detection and polar decoding(JDD) scheme for the system. The independent SCMA detection and polar decoding(IDD) scheme is unable to take full advantage of decoding information which lead to a poor system performance. Aiming at this problem, the proposed JDD scheme could achieve a significant performance gain which iteratively exchanged the soft information between the detector and the decoder by using intrinsic information to update the initial priori probabilities in SCMA detector. Simulation results show that, the performance of the system with JDD scheme has been significantly improved which obtain about 2 dB performance gain compared with the IDD scheme.