A Novel K-Repetition Design for SCMA

TL;DR

This paper introduces a novel NCK-SCMA scheme combining K-Repetition HARQ with network coding for LDPC uplink SCMA, enhancing reliability and throughput in machine-type communications.

Contribution

It proposes a new NCK-SCMA scheme with a joint iterative detection algorithm, improving upon conventional K-Repetition SCMA in reliability and throughput.

Findings

Higher throughput demonstrated in simulations

Improved reliability over conventional schemes

Effective detection algorithm developed

Abstract

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.