Channel Charting Aided Pilot Reuse for Massive MIMO Systems with Spatially Correlated Channels
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2022-12-01
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Mcode
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Language
en
Pages
17
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IEEE Open Journal of the Communications Society, Volume 3
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.Description
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Keywords
Channel charting, massive MIMO, pilot contamination, pilot reuse
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Citation
Ribeiro, L, Leinonen, M, Al-Tous, H, Tirkkonen, O & Juntti, M 2022, ' Channel Charting Aided Pilot Reuse for Massive MIMO Systems with Spatially Correlated Channels ', IEEE Open Journal of the Communications Society, vol. 3, 3225054, pp. 2390-2406 . https://doi.org/10.1109/OJCOMS.2022.3225054