This work presents a novel K-Repetition based HARQ scheme for LDPC coded uplink SCMA by employing a network coding (NC) principle to encode different packets, where K-Repetition is an emerging technique (recommended in 3GPP Release 15) for enhanced reliability and reduced latency in future massive machine-type communication. Such a scheme is referred to as the NC aided K-repetition SCMA (NCK-SCMA). We introduce a joint iterative detection algorithm for improved detection of the data from the proposed LDPC coded NCKSCMA systems. Simulation results demonstrate the benefits of NCK-SCMA with higher throughput and improved reliability over the conventional K-Repetition SCMA.

翻译：这项工作为LDPC编码上链接的SCMA提出了一个全新的K-Repetial HARQ计划,采用网络编码(NC)原则来编码不同包件,K-Repeti是一个新兴技术(在3GPP第15版中建议),用于提高未来大规模机器型通信的可靠性和缩短延迟性,称为NC协助的K重复SCMA(NK-SCMA)。我们采用了一种联合迭代探测算法,用于更好地探测拟议的LDPC编码上NCKSCMA系统的数据。模拟结果显示NCK-SCMA的效益是,对传统的K-Repecition SCMA具有更高的吞吐量和可靠性。