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Updated: Jul 27, 2025

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

Xinyu Huang1, Yubo Wang2, Shiyong Chen1

  • 1School of Microelectronics and Communication Engineering, Chongqing University, Chongqing 400044, China.

Sensors (Basel, Switzerland)
|June 10, 2023
PubMed
Summary
This summary is machine-generated.

Pilot reuse in cell-free massive MIMO systems causes performance issues. A new user clustering and graph coloring scheme effectively reduces pilot contamination, significantly improving system throughput with low complexity.

Keywords:
AP selectioncell-free massive MIMOgraph coloringpilot contaminationuser clustering

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Area of Science:

  • Wireless Communication
  • Signal Processing
  • Network Optimization

Background:

  • Pilot contamination is a major challenge in cell-free massive MIMO systems.
  • Existing pilot assignment schemes struggle to mitigate performance degradation caused by pilot reuse.

Purpose of the Study:

  • To propose a novel joint pilot assignment scheme to reduce pilot contamination.
  • To enhance the performance of cell-free massive MIMO systems.

Main Methods:

  • The proposed User Clustering and Graph Coloring (UC-GC) scheme involves AP selection for user classification.
  • Pilots are assigned to users with severe contamination first using graph coloring, followed by remaining users.

Main Results:

  • The UC-GC scheme significantly reduces pilot contamination compared to existing methods.
  • Numerical simulations demonstrate a substantial improvement in system throughput.
  • The proposed scheme achieves this improvement with low computational complexity.

Conclusions:

  • The UC-GC scheme is an effective solution for mitigating pilot contamination in cell-free massive MIMO.
  • This approach offers a practical method for enhancing system performance and spectral efficiency.