Exploiting Spatial Correlation for Pilot Reuse in Single-Cell mMTC

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

Tutkimustuotos: Artikkeli kirjassa/konferenssijulkaisussaConference contributionScientificvertaisarvioitu

5 Lataukset (Pure)

Abstrakti

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.
AlkuperäiskieliEnglanti
OtsikkoProceedings of the IEEE 32nd Annual International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2021
KustantajaIEEE
Sivumäärä6
TilaHyväksytty/In press - 2021
OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisuussa
TapahtumaIEEE International Symposium on Personal, Indoor, and Mobile Radio Communications - Virtual, Online
Kesto: 13 syyskuuta 202116 syyskuuta 2021
Konferenssinumero: 32

Julkaisusarja

NimiIEEE International Symposium on Personal, Indoor, and Mobile Radio Communications workshops
KustantajaIEEE
ISSN (painettu)2166-9570
ISSN (elektroninen)2166-9589

Conference

ConferenceIEEE International Symposium on Personal, Indoor, and Mobile Radio Communications
LyhennettäPIMRC
KaupunkiVirtual, Online
Ajanjakso13/09/202116/09/2021

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