Up-Link Asynchronous SCMA Low Complexity Signal Detection Algorithm

LEI Zhen-yu; LU Xiao-qiang

doi:10.13756/j.gtxyj.2021.04.001

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Up-Link Asynchronous SCMA Low Complexity Signal Detection Algorithm

- Up-Link Asynchronous SCMA Low Complexity Signal Detection Algorithm
- Study on Optical Communications Issue 4, Pages: 1-4,20(2021)
- 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：
- 基金信息：
- DOI：10.13756/j.gtxyj.2021.04.001
  CLC： TN929.5
- Published：10 August 2021，
  
  Received：04 November 2020，
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LEI Zhen-yu, LU Xiao-qiang. Up-Link Asynchronous SCMA Low Complexity Signal Detection Algorithm. [J]. Study on Optical Communications (4):1-4,20(2021)
DOI：

LEI Zhen-yu, LU Xiao-qiang. Up-Link Asynchronous SCMA Low Complexity Signal Detection Algorithm. [J]. Study on Optical Communications (4):1-4,20(2021) 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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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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Xiamen Nanyang College

Quanzhou Institute of Equipment Manufacturing, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences

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