Multi-User Detection Algorithm for Asynchronous Non-Orthogonal Multiple Access Based on Gaussian Approximation

Peisen WANG; Yueneng WANG; Boming CHENG; Yue YANG; Neng YE

doi:10.11959/j.issn.2096-8930.2023009

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Multi-User Detection Algorithm for Asynchronous Non-Orthogonal Multiple Access Based on Gaussian Approximation

Studies | 更新时间：2024-06-03

- Multi-User Detection Algorithm for Asynchronous Non-Orthogonal Multiple Access Based on Gaussian Approximation
- Space-Integrated-Ground Information Networks Vol. 4, Issue 1, Pages: 73-81(2023)
- 作者机构：
  
  1. 北京理工大学信息与电子学院，北京100081
  2. 北京理工大学睿信书院，北京100081
  3. 北京理工大学网络空间安全学院，北京 100081
- 作者简介：
- 基金信息：
- DOI：10.11959/j.issn.2096-8930.2023009
  CLC： V19
- Published Online：2023-03，
  
  Published：20 March 2023
- 稿件说明：
移动端阅览
Peisen WANG, Yueneng WANG, Boming CHENG, et al. Multi-User Detection Algorithm for Asynchronous Non-Orthogonal Multiple Access Based on Gaussian Approximation[J]. Space-integrated-ground information networks, 2023, 4(1): 73-81.
DOI：

Peisen WANG, Yueneng WANG, Boming CHENG, et al. Multi-User Detection Algorithm for Asynchronous Non-Orthogonal Multiple Access Based on Gaussian Approximation[J]. Space-integrated-ground information networks, 2023, 4(1): 73-81. DOI： 10.11959/j.issn.2096-8930.2023009.

摘要

码域非正交多址接入（NOMA）技术是卫星互联网实现泛在互联接入的潜在技术之一。考虑到星地传输具有大传播时延、高信道动态等特点，地面接入设备间保持严格定时同步将导致难以忍受的时间资源开销。多用户需要在松弛的同步关系下实现接入。现有码域NOMA的多用户检测算法大多基于同步传输假设，无法准确建模并高效缓解异步多用户传输引入的复杂干扰。为此，将用户间的相对时延引入传统的二部因子图中构建一种新颖的多层因子图模型，并基于此提出一种基于高斯近似的低复杂度异步多用户检测算法。该算法在每个用户的估计之间进行迭代，并在用户之间传播估计信息改进近似。仿真结果表明，在高信噪比区域，所提出检测算法性能优于同步NOMA的类似算法。

Abstract

Code domain non-orthogonal multiple access (NOMA) is one of the potential technologies to realize ubiquitous access in the future satellite internet.Considering that satellite-to-ground transmission has the characteristics of large propagation delay and high channel dynamics

strict timing synchronization between ground devices will lead to unbearable time resource overhead.Loosed synchronization relationship are required to achieve multi-user access in satellite internet.However

most of the existing multi-user detection algorithms in code domain NOMA are based on the assumption of synchronous transmission

which cannot accurately model and eff ectively alleviate the complex interference introduced by asynchronous multi-user transmission.Therefore

a novel multi-layer factor graph model by introduced the relative delay among users into the traditional two-part factor graph was constructed

and a low-complexity asynchronous multi-user detection algorithm based on gaussian approximation was proposed.The proposed algorithm iterated between each user's estimates and propagated the estimated information between users to improved the approximation.Simulation results showed that in high SNR region

the performance of the asynchronous code-domain NOMA with the proposed algorithm even outperforms its synchronous counterpart.

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references

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