两用户干扰信道下基于多层叠加编码调制的LDPC码传输策略

关梦生; 朱敏; 白宝明; 刘彤

doi:10.12263/DZXB.20250604

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两用户干扰信道下基于多层叠加编码调制的LDPC码传输策略

学术论文 | 更新时间：2025-12-27

- 两用户干扰信道下基于多层叠加编码调制的LDPC码传输策略
- A Transmission Scheme of LDPC Codes for Two-User Interference Channel Based on Multi-Level Superposition Coded Modulation
- 电子学报 2025年53卷第8期页码：2668-2677
- 作者机构：
  
  西安电子科技大学空天地一体化综合业务网全国重点实验室，陕西西安 710071
- 作者简介：
  
  [ "关梦生男，1993年出生于安徽省淮北市.西安电子科技大学博士研究生.主要研究方向为多用户通信与低密度校验码构造. E-mail: 18011210001@stu.xidian.edu.cn" ]
  [ "朱敏女，1986年出生于安徽省淮北市.现任西安电子科技大学副教授.主要研究方向为现代信道编码技术及应用.E-mail: mzhu@xidian.edu.cn" ]
  [ "白宝明男，1966年出生于山西省大同市.西安电子科技大学教授.主要研究方向为现代信道编码技术及应用、面向信息网络的多用户信息传输与编码、量子通信与量子编码技术. E-mail: bmbai@mail.xidian.edu.cn" ]
  [ "刘彤男，2001年出生于甘肃省兰州市.西安电子科技大学硕士研究生.主要研究方向为信道编码、正交时频空调制技术. E-mail: 24181214510@stu.xidian.edu.cn" ]
- 基金信息：
  
  国家自然科学基金(62271380;62171356)
- DOI：10.12263/DZXB.20250604
  中图分类号： TN91;
- 收稿：2025-07-06，
  
  录用：2025-08-22，
  
  纸质出版：2025-08-25
- 稿件说明：
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关梦生, 朱敏, 白宝明, 等. 两用户干扰信道下基于多层叠加编码调制的LDPC码传输策略[J]. 电子学报, 2025, 53(08): 2668-2677.

GUAN Meng-sheng, ZHU Min, BAI Bao-ming, et al. A Transmission Scheme of LDPC Codes for Two-User Interference Channel Based on Multi-Level Superposition Coded Modulation[J]. Acta Electronica Sinica, 2025, 53(08): 2668-2677.
关梦生, 朱敏, 白宝明, 等. 两用户干扰信道下基于多层叠加编码调制的LDPC码传输策略[J]. 电子学报, 2025, 53(08): 2668-2677. DOI：10.12263/DZXB.20250604

GUAN Meng-sheng, ZHU Min, BAI Bao-ming, et al. A Transmission Scheme of LDPC Codes for Two-User Interference Channel Based on Multi-Level Superposition Coded Modulation[J]. Acta Electronica Sinica, 2025, 53(08): 2668-2677. DOI：10.12263/DZXB.20250604

摘要

随着技术的不断革新，无线通信向着高层次和多维度发展，带来更高质量通信的同时也伴随着一系列技术难题.例如，多用户干扰导致互信息损失，异构网络下传输性能时变衰落增强，有限资源下的过载能力不足等.这些问题都亟需面向复杂场景的编码理论与传输架构研究.因此，为了改善两用户干扰信道中，用户间串扰导致的互信息损失和传输性能不佳等问题，本文在Han-Kobayashi等效的基础上，提出了一种结合多层叠加编码调制和可逆矩阵映射技术的收发策略和译码方案，为提高该信道场景下的通信可靠性提供了技术参考.在该策略中，发送端将多层叠加编码调制推广到两用户干扰信道，采用速率兼容低密度校验码作分层编码，并结合增加符号间距的映射变换提升传输的分层增益.接收端对应设计内外式多层译码器结构和复合嵌套译码算法，利用高斯近似简化计算复杂度.此外，在该收发策略的基础上，考虑进一步提高精确性，拓展设计了结合递增冗余混合自动重传的传输框架.仿真结果表明，复合嵌套译码算法在强干扰和弱干扰条件下均优于一般多级译码算法，并且性能随分层层数的增加而提升.同时，嵌套重传的算法可以在增加部分复杂度的情况下，获得更好的高信噪比性能.这些工作为干扰信道通信的实际传输应用提供了可选方案.

Abstract

With the continuous advancement of technology

wireless communication is evolving toward higher levels and multiple dimensions. While this progression enhances communication quality

it also introduces significant technical challenges. These include mutual information loss due to multi-user interference

worsened time-varying fading in networks

and insufficient overload factor under limited resources. These issues indicate the critical need for coding theories and transmission schemes designed for complex communication scenarios. To address the loss of mutual information and poor transmission performance caused by inter-user interference in two-user interference channels

this paper proposes a novel transmission scheme and decoding algorithm based on the Han-Kobayashi equivalence. This scheme combines multi-level superposition coded modulation and reversible matrix mapping

effectively improving communication performance in such channels. At the transmitter

multi-level superposition coded modulation was extended to two-user interference channels. Rate compatible low-density parity-check codes were employed for layered encoding

combined with mapping transformations to enhance layered transmission gains. At the receiver

a nested multi-layer decoder structure and interference channel-composite nesting decoder algorithm were designed. Gaussian approximation was used to reduce computational complexity. Additionally

to further improve accuracy

the framework of proposed scheme was expanded by using incremental redundancy-hybrid automatic repeat request. Simulation results show that the novel algorithm outperforms iterative multistage decoding algorithm under both strong and weak interference conditions and its performance is positively correlated to the number of layers. In addition

at the cost of moderate increases in computational complexity

the incremental redundancy-hybrid automatic repeat request enhanced algorithm achieves better performance under high signal-to-noise ratio conditions. These solutions provide practical options for real-world two-user interference channel communication systems.

关键词

Keywords

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