Channel Charting Aided Pilot Reuse for Massive MIMO Systems with Spatially Correlated Channels

Lucas Ribeiro, Markus Leinonen, Hanan Al-Tous, Olav Tirkkonen, Markku Juntti

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)
90 Downloads (Pure)

Abstract

Massive multiple-input multiple-output (mMIMO) technology is a way to increase spectral efficiency and provide access to the Internet of things (IoT) and machine-type communication (MTC) devices. To exploit the benefits of large antenna arrays, accurate channel estimation through pilot signals is needed. Massive IoT and MTC systems cannot avoid pilot reuse because of the enormous numbers of connected devices. We propose a pilot reuse algorithm based on channel charting (CC) to mitigate pilot contamination in a multi-sector single-cell mMIMO system having spatially correlated channels. We show that after creating an interference map via CC, a simple strategy to allocate the pilot sequences can be implemented. The simulation results show that the CC-based pilot reuse strategy improves channel estimation accuracy, which subsequently improves the symbol detection performance and increases the spectral efficiency compared to other existing schemes. Moreover, the performance of the CC pilot assignment method approaches that of exhaustive search pilot assignment for small network setups.

Original languageEnglish
Article number3225054
Pages (from-to)2390-2406
Number of pages17
JournalIEEE Open Journal of the Communications Society
Volume3
DOIs
Publication statusPublished - 1 Dec 2022
MoE publication typeA1 Journal article-refereed

Keywords

  • Channel charting
  • massive MIMO
  • pilot contamination
  • pilot reuse

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