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

This article has now been updated. Please use the final version.

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 Advance online publication

Article ID: 2021ETL0015

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

The final version of this article is now available: Vol. 10 (2021), No. 8 pp. 428-434

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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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