Joint User Clustering and Graph Coloring Based Pilot Assignment for Cell-Free Massive MIMO Systems

Autor:	Xinyu Huang, Yubo Wang, Shiyong Chen, Yan Li, Yucheng Wu
Jazyk:	angličtina
Rok vydání:	2023
Předmět:	cell-free massive MIMO pilot contamination AP selection user clustering graph coloring Chemical technology TP1-1185
Zdroj:	Sensors, Vol 23, Iss 11, p 5014 (2023)
Druh dokumentu:	article
ISSN:	1424-8220
DOI:	10.3390/s23115014
Popis:	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.
Databáze:	Directory of Open Access Journals
Externí odkaz:	https://doaj.org/article/261e5754bd1348b3879477850a9d6d4f Zobrazit plný text záznamu View record in DOAJ Plný text ve formátu PDF Plný text ve formátu HTML
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