Joint User Clustering and Graph Coloring Based Pilot Assignment for Cell-Free Massive MIMO Systems
Pilot contamination due to pilot reuse seriously mitigates the performance of the cell-free massive multiple-input multiple-output (MIMO) systems. In this paper, we propose a joint pilot assignment scheme that employs user clustering and graph coloring (UC-GC) to reduce pilot contamination. The prop...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-05-01
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| Series: | Sensors |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1424-8220/23/11/5014 |
| _version_ | 1827739194759315456 |
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| author | Xinyu Huang Yubo Wang Shiyong Chen Yan Li Yucheng Wu |
| author_facet | Xinyu Huang Yubo Wang Shiyong Chen Yan Li Yucheng Wu |
| author_sort | Xinyu Huang |
| collection | DOAJ |
| description | Pilot contamination due to pilot reuse seriously mitigates the performance of the cell-free massive multiple-input multiple-output (MIMO) systems. In this paper, we propose a joint pilot assignment scheme that employs user clustering and graph coloring (UC-GC) to reduce pilot contamination. The proposed method consists of two steps: firstly, we utilize AP selection to classify all users; secondly, we assign pilots to users with more severe pilot contamination using the graph coloring algorithm and then assign pilots to the remaining users. The numerical simulation results show that the proposed scheme outperforms existing pilot assignment schemes and significantly improves throughout with low complexity. |
| first_indexed | 2024-03-11T02:57:24Z |
| format | Article |
| id | doaj.art-261e5754bd1348b3879477850a9d6d4f |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-11T02:57:24Z |
| publishDate | 2023-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-261e5754bd1348b3879477850a9d6d4f2023-11-18T08:31:21ZengMDPI AGSensors1424-82202023-05-012311501410.3390/s23115014Joint User Clustering and Graph Coloring Based Pilot Assignment for Cell-Free Massive MIMO SystemsXinyu Huang0Yubo Wang1Shiyong Chen2Yan Li3Yucheng Wu4School of Microelectronics and Communication Engineering, Chongqing University, Chongqing 400044, ChinaBeijing Smart-Chip Microelectronics Technology Co., Ltd., Beijing 100192, ChinaSchool of Microelectronics and Communication Engineering, Chongqing University, Chongqing 400044, ChinaSchool of Microelectronics and Communication Engineering, Chongqing University, Chongqing 400044, ChinaSchool of Microelectronics and Communication Engineering, Chongqing University, Chongqing 400044, ChinaPilot contamination due to pilot reuse seriously mitigates the performance of the cell-free massive multiple-input multiple-output (MIMO) systems. In this paper, we propose a joint pilot assignment scheme that employs user clustering and graph coloring (UC-GC) to reduce pilot contamination. The proposed method consists of two steps: firstly, we utilize AP selection to classify all users; secondly, we assign pilots to users with more severe pilot contamination using the graph coloring algorithm and then assign pilots to the remaining users. The numerical simulation results show that the proposed scheme outperforms existing pilot assignment schemes and significantly improves throughout with low complexity.https://www.mdpi.com/1424-8220/23/11/5014cell-free massive MIMOpilot contaminationAP selectionuser clusteringgraph coloring |
| spellingShingle | Xinyu Huang Yubo Wang Shiyong Chen Yan Li Yucheng Wu Joint User Clustering and Graph Coloring Based Pilot Assignment for Cell-Free Massive MIMO Systems Sensors cell-free massive MIMO pilot contamination AP selection user clustering graph coloring |
| title | Joint User Clustering and Graph Coloring Based Pilot Assignment for Cell-Free Massive MIMO Systems |
| title_full | Joint User Clustering and Graph Coloring Based Pilot Assignment for Cell-Free Massive MIMO Systems |
| title_fullStr | Joint User Clustering and Graph Coloring Based Pilot Assignment for Cell-Free Massive MIMO Systems |
| title_full_unstemmed | Joint User Clustering and Graph Coloring Based Pilot Assignment for Cell-Free Massive MIMO Systems |
| title_short | Joint User Clustering and Graph Coloring Based Pilot Assignment for Cell-Free Massive MIMO Systems |
| title_sort | joint user clustering and graph coloring based pilot assignment for cell free massive mimo systems |
| topic | cell-free massive MIMO pilot contamination AP selection user clustering graph coloring |
| url | https://www.mdpi.com/1424-8220/23/11/5014 |
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