上行异步SCMA系统低复杂度检测算法

雷震宇; 卢晓强

doi:10.13756/j.gtxyj.2021.04.001

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上行异步SCMA系统低复杂度检测算法

光通信系统与网络技术

- 上行异步SCMA系统低复杂度检测算法
- Up-Link Asynchronous SCMA Low Complexity Signal Detection Algorithm
- 光通信研究 2021年第4期页码：1-4,20
- 作者机构：
  
  a.重庆邮电大学　通信与信息工程学院，重庆　400065
  b.重庆邮电大学　新一代宽带移动通信重点实验室，重庆　400065
- 作者简介：
  
  雷震宇，硕士。E-mail：975943839@qq.com
- 基金信息：
  
  国家科技重大专项基金资助项目(2018ZX03001026-002)
- DOI：10.13756/j.gtxyj.2021.04.001
  中图分类号： TN929.5
- 纸质出版日期：2021-08-10，
  
  收稿日期：2020-11-04，
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雷震宇, 卢晓强. 上行异步SCMA系统低复杂度检测算法[J]. 光通信研究, 2021,(4):1-4,20.

LEI Zhen-yu, LU Xiao-qiang. Up-Link Asynchronous SCMA Low Complexity Signal Detection Algorithm[J]. Study on Optical Communications, 2021,(4):1-4,20.
雷震宇, 卢晓强. 上行异步SCMA系统低复杂度检测算法[J]. 光通信研究, 2021,(4):1-4,20. DOI： 10.13756/j.gtxyj.2021.04.001.

LEI Zhen-yu, LU Xiao-qiang. Up-Link Asynchronous SCMA Low Complexity Signal Detection Algorithm[J]. Study on Optical Communications, 2021,(4):1-4,20. DOI： 10.13756/j.gtxyj.2021.04.001.

摘要

在非授权的情形下，由于缺少时间同步的信令，导致稀疏码多址接入（SCMA）系统中异步接收的问题不可忽视。现有的置信传播消息传递算法（BP-MPA）可以对异步SCMA系统进行检测，但是复杂度较高。针对上行异步SCMA系统检测算法复杂度较高的问题，文章在BP-MPA的基础上，根据每个资源对用户发送码字概率的判断，选择部分高可靠用户节点不参与消息传递算法的迭代，提出一种改进的置信传播消息传递算法（IBP-MPA）。仿真结果表明，在相同条件下，IBP-MPA可以在保证检测性能的情况下大幅降低BP-MPA的复杂度。

Abstract

In the case of grant free

due to the lack of synchronous time signaling

the problem of asynchronous reception in Sparse Code Multiple Access (SCMA) system cannot be ignored. The existing Belief Propagation Message Passing Algorithm (BP-MPA) can detect asynchronous SCMA

but the complexity is high. Aiming at the problem of high complexity of detection algorithm in uplink asynchronous SCMA system

this paper proposes an Improved Belief Propagation Message Passing Algorithm (IBP-MPA) by selecting some highly reliable user nodes not to participate in the iteration of message passing algorithm according to the judgment of each resource on the probability of user sending codeword. The simulation results show that under the same conditions

IBP-MPA can greatly reduce the complexity of BP-MPA while maintaining the detection performance.

关键词

异步稀疏码多址接入消息传递算法置信传播消息传递算法

Keywords

asynchronous SCMAMPABP-MPA

references

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Liu Y, Qin Z, Elkashlan M, et al. Non-Orthogonal Multiple Access for 5G and Beyond[J]. Proceedings of the IEEE, 2018, 105(12): 2347-2381.

Du Y, Dong B, Zhu W, et al. Joint Channel Estimation and Multiuser Detection for Uplink Grant-Free NOMA[J]. IEEE Wireless Communications Letters, 2018, 7(4): 682-685.

Wang X, Labeau F, Mei L. Asynchronous Uplink Non-Orthogonal Multiple Access(NOMA)with Cyclic Prefix[C]//IEEE Wireless Communications and Networking Conference. Barcelona, Spain: IEEE, 2018: 1-6.

Zou X, He B, Jafarkhani H. On Uplink Asynchronous Non-Orthogonal Multiple Access Systems with Timing Error[C]//IEEE International Conference on Communications. Kansas City, MO: IEEE, 2018: 1-6.

Zou X, He B, Jafarkhani H. An Analysis of Two-User Uplink Asynchronous Non-Orthogonal Multiple Access Systems[J]. IEEE Transactions on Wireless Communications, 2019, 18(2): 1404-1418.

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Dai L, Wang B, Ding Z, et al. A Survey of Non-Orthogonal Multiple Access for 5G[J]. IEEE Communications. Surveys & Tutorial, 2018, 20(3): 2294-2323.

Taherzadeh M, Nikopour H, Bayesteh A, et al. SCMA Codebook Design[C]//IEEE 80th Vehicular Technology Conference(VTC2014-Fall). Vancouver, BC: IEEE, 2014: 1-5.

Bayesteh A, Nikopour H, Taherzadeh M, et al. Low Complexity Techniques for SCMA Detection[C]//IEEE Globecom Workshops. San Diego, CA, USA: IEEE, 2015: 1-6.

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