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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.
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 language | English |
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Title of host publication | Proceedings of the IEEE 32nd Annual International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2021 |
Publisher | IEEE |
Pages | 654-659 |
Number of pages | 6 |
ISBN (Electronic) | 978-1-7281-7586-7 |
DOIs | |
Publication status | Published - 22 Oct 2021 |
MoE publication type | A4 Conference publication |
Event | IEEE International Symposium on Personal, Indoor and Mobile Radio Communications - Helsinki, Finland Duration: 13 Sept 2021 → 16 Sept 2021 Conference number: 32 |
Publication series
Name | IEEE International Symposium on Personal, Indoor, and Mobile Radio Communications workshops |
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ISSN (Print) | 2166-9570 |
ISSN (Electronic) | 2166-9589 |
Conference
Conference | IEEE International Symposium on Personal, Indoor and Mobile Radio Communications |
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Abbreviated title | PIMRC |
Country/Territory | Finland |
City | Helsinki |
Period | 13/09/2021 → 16/09/2021 |
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Dive into the research topics of 'Exploiting Spatial Correlation for Pilot Reuse in Single-Cell mMTC'. Together they form a unique fingerprint.Projects
- 1 Finished
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-: Radio Network Optimization for Heterogeneous Machine Connectivity
Tirkkonen, O. (Principal investigator)
01/01/2019 → 31/12/2022
Project: Academy of Finland: Other research funding