Mobile Networks and Applications

, Volume 23, Issue 4, pp 1028–1034 | Cite as

Rateless Coding Based Incremental Redundancy HARQ Scheme for SCMA Systems

  • Min Zhu
  • Qingli He
  • Rui Zhang
  • Baoming BaiEmail author


In this paper, we present a rateless coding based incremental redundancy (IR) HARQ scheme for sparse code multiple access (SCMA) systems over fading channels, where each user is assumed to use rateless codes. Two different IR-HARQ strategies are proposed for the SCMA system to investigate the performance from different angles. One scheme mainly focuses on how to combine the incremental decoding and the multi-user detection (termed as the original rateless coding based IR-HARQ strategy). The other scheme employs the iteration between the incremental decoding and the multi-user detection to improve the performance (termed as the joint detection-decoding rateless coding based IR-HARQ strategy). We investigate the performance of these two strategies over the AWGN and fast-fading channels. Simulation results show that, with the proposed IR-HARQ scheme, the SCMA system performance improves with the increase of the retransmission. Furthermore, with the help of the iteration between the detector and the decoding, the SCMA system with the joint detection-decoding rateless coding based IR-HARQ strategy outperforms the original one.


HARQ Iterative decoding Incremental redundancy Rateless SCMA 



This work is supported in part by National Natural Science Foundation of China under Grants No. 61701368, 61372074, and by the National Basic Research Program of China (973 Program) under Grant No. 2012CB316100.


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© Springer Science+Business Media, LLC 2017

Authors and Affiliations

  1. 1.ISN State Key LaboratoryXidian UniversityXi’anChina

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