Channel Charting Aided Pilot Allocation in Multi-Cell Massive MIMO mMTC Networks

Lucas Ribeiro, Markus Leinonen, Isuru Rathnayaka, Hanan Al-Tous, Markku Juntti

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

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Abstract

Serving a plethora of devices in massive machinetype communications (mMTC) can rely on spatial multiplexing enabled by massive multiple-input multiple-output (mMIMO) technology. To release the full potential, accurate channel estimation is needed. Due to the large numbers of devices it necessitates pilot reuse. We propose a pilot allocation algorithm based on multi-point channel charting (CC) to mitigate inevitable pilot contamination in a multi-cell multi-sector mMTC network with spatially correlated mMIMO channels. The generated CC represents an effective interference map from channel covariance matrices to capture the degree of pilot contamination caused by sharing the same pilot sequence among multiple users. The map is then fed into a greedy algorithm that aims at optimizing the reuse pattern of orthogonal pilot sequences to minimize the performance degradation caused by pilot contamination. The proposed CC-based method is empirically shown to obtain notable gains over a reuse-factor-aware random pilot allocation, yet leaving room for further improvements.

Original languageEnglish
Title of host publication2022 IEEE 23rd International Workshop on Signal Processing Advances in Wireless Communication, SPAWC 2022
PublisherIEEE
Number of pages5
ISBN (Electronic)9781665494557
DOIs
Publication statusPublished - 2022
MoE publication typeA4 Article in a conference publication
EventIEEE International Workshop on Signal Processing Advances in Wireless Communication - Oulu, Finland
Duration: 4 Jul 20226 Jul 2022

Publication series

NameIEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC
Volume2022-July

Conference

ConferenceIEEE International Workshop on Signal Processing Advances in Wireless Communication
Abbreviated titleSPAWC
Country/TerritoryFinland
CityOulu
Period04/07/202206/07/2022

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