Cell partitioned M-QAM for semi-blind uplink interference suppression on multicell massive MIMO systems

Kakeru Matsubara; Yuta Goto; Koki Ito; Kazushi Shimada; Kazuki Maruta; Chang-Jun Ahn

doi:10.1587/comex.2021ETL0015

Special Cluster on Advanced Communication Technologies in Conjunction with Main Topics of ICETC2020

Cell partitioned M-QAM for semi-blind uplink interference suppression on multicell massive MIMO systems

Kakeru Matsubara, Yuta Goto, Koki Ito, Kazushi Shimada, Kazuki Maruta, Chang-Jun Ahn

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Keywords: channel estimation, pilot contamination, massive MIMO, multicell, decision feedback, sample matrix inversion

JOURNAL FREE ACCESS

2021 Volume 10 Issue 8 Pages 428-434

DOI https://doi.org/10.1587/comex.2021ETL0015

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Abstract

This letter adopts higher-order modulation scheme than 16QAM to our previously proposed semi-blind uplink interference suppression scheme for multicell multiuser massive MIMO systems. Our semi-blind approach is attained by the decision feedback channel estimation (DFCE) and the sample matrix inversion (SMI) spatial adaptive filtering. However, its efficiency depended on inter-cell interference (ICI), in particular for higher-order QAM. We propose to employ cell partitioning-based M-ary QAM to avoid ICI at the initial condition and verify overall spectral efficiency improvement.

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