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.
@article{arxiv.2205.08149,
title = {A Novel K-Repetition Design for SCMA},
author = {Ke Lai and Zilong Liu and Jing Lei and Lei Wen and Gaojie Chen and Pei Xiao},
journal= {arXiv preprint arXiv:2205.08149},
year = {2022}
}