Exploiting Spatial Correlation for Pilot Reuse in Single-Cell mMTC

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

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

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Abstract

As a key enabler for massive machine-type communications (mMTC), spatial multiplexing relies on massive multiple-input multiple-output (mMIMO) technology to serve the massive number of user equipments (UEs). To exploit spatial multiplexing, accurate channel estimation through pilot signals is needed. In mMTC systems, it is impractical to allocate a unique orthogonal pilot sequence to each UE as it would require too long pilot sequences, degrading the spectral efficiency. This work addresses the design of channel features from correlated fading channels to assist the pilot assignment in multi-sector mMTC systems under pilot reuse of orthogonal sequences. In order to reduce pilot collisions and to enable pilot reuse, we propose to extract features from the channel covariance matrices that reflect the level of orthogonality between the UEs channels. Two features are investigated: covariance matrix distance (CMD)
feature and CMD-aided channel charting (CC) feature. In terms of symbol error rate and achievable rate, the CC-based feature shows superior performance than the CMD-based feature and baseline pilot assignment algorithms.
Original languageEnglish
Title of host publicationProceedings of the IEEE 32nd Annual International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2021
PublisherIEEE
Number of pages6
Publication statusAccepted/In press - 2021
MoE publication typeA4 Article in a conference publication
EventIEEE International Symposium on Personal, Indoor, and Mobile Radio Communications - Virtual, Online
Duration: 13 Sep 202116 Sep 2021
Conference number: 32

Publication series

NameIEEE International Symposium on Personal, Indoor, and Mobile Radio Communications workshops
PublisherIEEE
ISSN (Print)2166-9570
ISSN (Electronic)2166-9589

Conference

ConferenceIEEE International Symposium on Personal, Indoor, and Mobile Radio Communications
Abbreviated titlePIMRC
CityVirtual, Online
Period13/09/202116/09/2021

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