Cell-Free Massive MIMO with Energy-Efficient Downlink Operation in Industrial IoT

Cell-free massive Multi-input Multi-output (MIMO) can offer higher spectral efficiency compared with cellular massive MIMO by providing services to users through the collaboration of distributed APs, and cell-free massive MIMO systems with distributed operations are attracting a great deal of indust...

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Bibliographic Details
Published inMathematics (Basel) Vol. 10; no. 10; p. 1687
Main Authors Chen, Xiaomin, Zhao, Taotao, Sun, Qiang, Hu, Qiaosheng, Xu, Miaomiao
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.05.2022
Subjects
access point selection
Algorithms
cell-free
Collaboration
Communication
Control algorithms
Data processing
distributed operations
Downlinking
Energy consumption
Energy efficiency
energy efficient
Industrial applications
industrial internet
Integer programming
Internet of Things
Mixed integer
Nonlinear programming
Optimization
Pilots
power allocation
Power consumption
Radio frequency identification
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Summary:Cell-free massive Multi-input Multi-output (MIMO) can offer higher spectral efficiency compared with cellular massive MIMO by providing services to users through the collaboration of distributed APs, and cell-free massive MIMO systems with distributed operations are attracting a great deal of industry attention due to their simplicity and ease of deployment. This paper aims to find an optimal solution for energy efficiency in the downlink operation in the Industrial Internet based on cell-free massive MIMO systems with distributed operations. A system model is proposed, and a theoretical analysis on energy efficiency is presented. The optimization problem of efficient downlink operation is formulated as a mixed-integer nonlinear programming (MINLP) problem, which is further decomposed into two sub-problems, i.e., maximizing the sum-rate of the downlink transmission and optimizing the total energy consumption. The two sub-problems are addressed via AP selection and power allocation, respectively. The simulation results demonstrate that our algorithms can significantly improve the energy efficiency with low computational complexity in comparison with traditional distributed cell-free massive MIMO. Even in the presence of pilot contamination, the proposed algorithms can still provide significant energy efficiency when a large number of IoTDs are connected.
ISSN:2227-7390
2227-7390
DOI:10.3390/math10101687