基于网络编码的稀疏码分多址接入HARQ方案

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

通信学报 ›› 2022, Vol. 43 ›› Issue (9): 57-69.doi: 10.11959/j.issn.1000-436x.2022174

基于网络编码的稀疏码分多址接入HARQ方案

赖恪, 雷菁, 刘伟, 文磊

国防科技大学电子科学学院，湖南长沙 410073

修回日期:2022-08-16 出版日期:2022-09-25 发布日期:2022-09-01
作者简介:赖恪（1994- ），男，福建厦门人，国防科技大学博士生，主要研究方向为先进接入技术、信道编码技术、物联网以及随机接入等
雷菁（1968- ），女，陕西西安人，博士，国防科技大学教授、博士生导师，主要研究方向为信息论、LDPC、空时编码、先进的多址技术、物理层安全、隐蔽通信、无线通信技术等
刘伟（1979- ），男，湖南邵阳人，博士，国防科技大学副教授，主要研究方向为通感一体化、物联网、空时编码以及MIMO等
文磊（1980- ），男，湖南长沙人，博士，国防科技大学副教授，主要研究方向为先进接入技术、信道编码技术等
基金资助:
湖南省自然科学基金资助项目(2021JJ30777);国防科技基金资助项目(3101168);基础加强计划技术领域基金资助项目

HARQ scheme for sparse code multiple access based on network coding

Ke LAI, Jing LEI, Wei LIU, Lei WEN

College of Electronic Science and Technology, National University of Defense Technology, Changsha 410073, China

Revised:2022-08-16 Online:2022-09-25 Published:2022-09-01
Supported by:
The Natural Science Foundation of Hunan Province(2021JJ30777);The National Defense Technology Foundation(3101168);Foundation Enhancement Program in Technical

摘要/Abstract

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。

关键词: 稀疏码分多址接入, 混合自动重传请求, 网络编码, 低密度奇偶校验, 吞吐量

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.

Key words: sparse code multiple access, hybrid automatic retransmission request, network coding, low-density parity check, throughput

中图分类号:

TN92

赖恪, 雷菁, 刘伟, 文磊. 基于网络编码的稀疏码分多址接入HARQ方案[J]. 通信学报, 2022, 43(9): 57-69.

Ke LAI, Jing LEI, Wei LIU, Lei WEN. HARQ scheme for sparse code multiple access based on network coding[J]. Journal on Communications, 2022, 43(9): 57-69.

图/表 13

图1

图2

图3

图4

表1

联合检测所选择的最优权重因子"

最优权重因子	条件
1.2	AWGN 信道，“4×6” “5×10”NC-SCMA，
	$c = \frac{1}{2}, \frac{5}{6}$ ，R_eq= 2, 3, 3.5
1.0	Rayleigh信道，“4×6” NC-SCMA， $c = \frac{1}{2}, \frac{2}{3}, \frac{5}{6}$ ，
	R_eq=2,3,3.5
0.8	Rayleigh 信道，“5×10”NC-SCMA，
	$c = \frac{1}{2}, \frac{2}{3}, \frac{5}{6}$ ，R_eq= 2, 3, 3.5

表1

图5

图6

图7

图8

图9

图10

图11

图12

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基于网络编码的稀疏码分多址接入HARQ方案

HARQ scheme for sparse code multiple access based on network coding

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