noma辅助无单元mMIMO系统中的试点分配：一个超图着色方案

IF 5.5 3区计算机科学 Q1 COMPUTER SCIENCE, INFORMATION SYSTEMS

IEEE Wireless Communications Letters Pub Date : 2025-04-21 DOI:10.1109/LWC.2025.3562893

Qin Wang;Haotian Chang;Ping Hou;Hui Zhang;Haitao Zhao;Hongbo Zhu

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引用次数: 0

摘要

为满足未来第六代（6G）网络日益增长的设备和数据流量需求，在超密集无线网络（UDWNs）下，研究了一种集成非正交多址（NOMA）的无小区大规模多输入多输出（CF-mMIMO）系统。然而，由NOMA引起的集群内先导污染严重损害了系统性能。为了解决这一问题，提出了一种基于超图着色（hypergraph coloring， HGC）的飞行员分配算法，该算法考虑了多用户之间复杂的累积干扰。该算法采用主接入点选择方法构建主接入点的干扰超图，并根据超图内的干扰权重分配导频。数值结果表明，所提出的noma -超图格式能显著提高系统的频谱效率。

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Pilot Assignment in NOMA-Aided Cell-Free mMIMO Systems: A Hypergraph Coloring Scheme

A cell-free massive multiple-input multiple-output (CF-mMIMO) system integrated with non-orthogonal multiple-access (NOMA) is investigated under ultra-dense wireless networks (UDWNs) to meet the growing demands of devices and data traffic demand in the future sixth generation (6G) networks. However, intra-cluster pilot contamination due to NOMA severely impairs system performance. To mitigate this issue, a novel hypergraph coloring (HGC)-based algorithm is proposed for pilot assignment considering the complex cumulative interference among multiple users. In this algorithm, the main access points (APs) selection method is employed to construct their interference hypergraph, and pilots are assigned according to the interference weights within the hypergraph. Numerical results demonstrate that the proposed NOMA-hypergraph scheme can significantly improve spectral efficiency in the system.

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来源期刊

IEEE Wireless Communications Letters Engineering-Electrical and Electronic Engineering

CiteScore

12.30

自引率

6.30%

发文量

481

期刊介绍： IEEE Wireless Communications Letters publishes short papers in a rapid publication cycle on advances in the state-of-the-art of wireless communications. Both theoretical contributions (including new techniques, concepts, and analyses) and practical contributions (including system experiments and prototypes, and new applications) are encouraged. This journal focuses on the physical layer and the link layer of wireless communication systems.