Iterative detection and decoding for SCMA systems with LDPC codes
Abstract
Sparse code multiple access (SCMA) is a promising multiplexing approach to achieve high system capacity. In this paper, we develop a novel iterative detection and decoding scheme for SCMA systems combined with Low-density Parity-check (LDPC) decoding. In particular, we decompose the output of the message passing algorithm (MPA) based SCMA multiuser detection into intrinsic part and prior part. Then we design a joint detection and decoding scheme which iteratively exchanges the intrinsic information between the detector and the decoder, yielding a satisfied performance gain. Moreover, the proposed scheme has almost the same complexity compared to the traditional receiver for LDPC-coded SCMA systems. As numerical results demonstrate, the proposed scheme has a substantial gain over the traditional SCMA receiver on AWGN channels and Rayleigh fading channels.
Cite
@article{arxiv.1508.00680,
title = {Iterative detection and decoding for SCMA systems with LDPC codes},
author = {Baicen Xiao and Kexin Xiao and Shutian Zhang and Zhiyong Chen and Bin Xia and Hui Liu},
journal= {arXiv preprint arXiv:1508.00680},
year = {2015}
}