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Clustering-based Pilot Assignment for Mitigating Pilot Contamination in Cell-Free Massive MIMO
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- Authors
- Jungho Myung, Keunyoung Kim, Young-Jo Ko
- Issue Date
- 2025-10
- Citation
- IEEE Transactions on Vehicular Technology, v.권호미정, pp.1-5
- ISSN
- 0018-9545
- Publisher
- IEEE
- Language
- English
- Type
- Journal Article
- Abstract
- We propose a clustering-based pilot assignment scheme to mitigate pilot contamination in cell-free massive multiple-input multiple-output systems. To reduce computational complexity, the proposed scheme initially clusters user equipment based on their geographical locations. Within each cluster, pilot assignment employs a graph coloring technique to eliminate intra-cluster pilot contamination. Additionally, color adjustment is used for pilot reassignment to minimize inter-cluster contamination. Experimental results show that the proposed scheme achieves the highest uplink throughput compared to existing techniques.
- KSP Keywords
- Cluster contamination, Color adjustment, Computational complexity, Graph Coloring, Inter-cluster, Intra-cluster, Multiple input multiple output(MIMO), Multiple-Input Multiple-Output System, cell-free, clustering based, massive mimo