A Left-Null-Space-Based Massive Access Method for Cell-Free Massive MIMO IoT Systems
Cell-free massive multiple-input multiple-output (MIMO) is a promising technology for the Internet of Things (IoT) because it can increase connectivity and provide considerable energy efficiency (EE) and spectral efficiency (SE). However, pilot contamination caused by pilot reuse severely limits the...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-06-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/23/11/5285 |
| _version_ | 1797596695526113280 |
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| author | Yang Wang Die Hu |
| author_facet | Yang Wang Die Hu |
| author_sort | Yang Wang |
| collection | DOAJ |
| description | Cell-free massive multiple-input multiple-output (MIMO) is a promising technology for the Internet of Things (IoT) because it can increase connectivity and provide considerable energy efficiency (EE) and spectral efficiency (SE). However, pilot contamination caused by pilot reuse severely limits the performance of the system. In this paper, we propose a left-null-space-based massive access method that can significantly reduce interference among users. The proposed method includes three stages: initial orthogonal access, left-null-space-based opportunistic access and data detection of all accessed users. The simulation results show that the proposed method can achieve much higher spectral efficiency than the existing massive access methods. |
| first_indexed | 2024-03-11T02:56:41Z |
| format | Article |
| id | doaj.art-6572e363066d4db88a22e267cf5834cd |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-11T02:56:41Z |
| publishDate | 2023-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-6572e363066d4db88a22e267cf5834cd2023-11-18T08:35:04ZengMDPI AGSensors1424-82202023-06-012311528510.3390/s23115285A Left-Null-Space-Based Massive Access Method for Cell-Free Massive MIMO IoT SystemsYang Wang0Die Hu1Department of Communication Science and Engineering, Fudan University, Shanghai 200082, ChinaDepartment of Communication Science and Engineering, Fudan University, Shanghai 200082, ChinaCell-free massive multiple-input multiple-output (MIMO) is a promising technology for the Internet of Things (IoT) because it can increase connectivity and provide considerable energy efficiency (EE) and spectral efficiency (SE). However, pilot contamination caused by pilot reuse severely limits the performance of the system. In this paper, we propose a left-null-space-based massive access method that can significantly reduce interference among users. The proposed method includes three stages: initial orthogonal access, left-null-space-based opportunistic access and data detection of all accessed users. The simulation results show that the proposed method can achieve much higher spectral efficiency than the existing massive access methods.https://www.mdpi.com/1424-8220/23/11/5285cell-free massive multi-input multi-outputMIMOmassive accessinterferencepilot contaminationleft-null-space |
| spellingShingle | Yang Wang Die Hu A Left-Null-Space-Based Massive Access Method for Cell-Free Massive MIMO IoT Systems Sensors cell-free massive multi-input multi-output MIMO massive access interference pilot contamination left-null-space |
| title | A Left-Null-Space-Based Massive Access Method for Cell-Free Massive MIMO IoT Systems |
| title_full | A Left-Null-Space-Based Massive Access Method for Cell-Free Massive MIMO IoT Systems |
| title_fullStr | A Left-Null-Space-Based Massive Access Method for Cell-Free Massive MIMO IoT Systems |
| title_full_unstemmed | A Left-Null-Space-Based Massive Access Method for Cell-Free Massive MIMO IoT Systems |
| title_short | A Left-Null-Space-Based Massive Access Method for Cell-Free Massive MIMO IoT Systems |
| title_sort | left null space based massive access method for cell free massive mimo iot systems |
| topic | cell-free massive multi-input multi-output MIMO massive access interference pilot contamination left-null-space |
| url | https://www.mdpi.com/1424-8220/23/11/5285 |
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