HARQ scheme for sparse code multiple access based on network coding

Ke LAI; Jing LEI; Wei LIU; Lei WEN

doi:10.11959/j.issn.1000-436x.2022174

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HARQ scheme for sparse code multiple access based on network coding

Papers | 更新时间：2024-06-05

- HARQ scheme for sparse code multiple access based on network coding
- Journal on Communications Vol. 43, Issue 9, Pages: 57-69(2022)
- 作者机构：
  
  国防科技大学电子科学学院，湖南长沙 410073
- 作者简介：
- 基金信息：
  
  The Natural Science Foundation of Hunan Province(2021JJ30777);The National Defense Technology Foundation(3101168);Foundation Enhancement Program in Technical
- DOI：10.11959/j.issn.1000-436x.2022174
  CLC： TN92
- Online First：2022-09，
  
  Published：25 September 2022
- 稿件说明：
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Ke LAI, Jing LEI, Wei LIU, et al. HARQ scheme for sparse code multiple access based on network coding[J]. Journal on Communications, 2022, 43(9): 57-69.
DOI：

Ke LAI, Jing LEI, Wei LIU, et al. HARQ scheme for sparse code multiple access based on network coding[J]. Journal on Communications, 2022, 43(9): 57-69. DOI： 10.11959/j.issn.1000-436x.2022174.

摘要

为了应对后5G以及未来6G时代对可靠性、时延以及吞吐量的严苛要求，针对低密度奇偶校验（LDPC）码编码的稀疏码分多址接入（SCMA）技术，提出了一种网络编码（NC）辅助的新型 HARQ 方案。该方案在多用户场景下，将各用户传输过程中处于2个不同时隙的错误包利用NC进行异或操作后重传。这样一来，一方面，只需要一次重传即可完成2个数据包的信息传输；另一方面，重传的数据包在接收端将会获得额外的编码增益。同时，考虑到LDPC和SCMA译码结构的相似性，以及NC译码器的单校验节点特征，基于消息传递算法（MPA），设计了SCMA、LDPC以及NC的联合迭代算法。该算法使接收端能够充分利用当下以及先前传输所获取的软信息，进而发挥NC所带来的编码增益。仿真结果表明，所提方案能够获得比SCMA的传统HARQ方案更高的吞吐量以及可靠性。

Abstract

To fulfill the stringent reliability and throughput demand of the beyond-5G and the forthcoming 6G

a novel network coding (NC) based hybrid automatic retransmission request (HARQ) for low-density parity check (LDPC) coded SCMA was proposed.Two incorrectly received packets from different time slots were retransmitted by using NC principle under multi-user scenario.By doing so

the information came from two packets could be conveyed in one retransmission.Moreover

extra coding gain could be attained at the receiver.Furthermore

since the similarity between SCMA detector and LDPC decoder

and the one check node feature of NC decoder

a SCMA

LDPC and NC joint decoder based on message passing algorithm (MPA) was proposed.The proposed scheme could fully utilize the soft messages come from current and previous transmissions

and thus exploiting satisfied coding gain from NC.Simulation results show that the superiority of the proposed novel HARQ scheme for SCMA over the conventional HARQ on both throughput and reliability.

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Keywords

references

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