Prediction-aided precoding for multiuser massive MIMO null-space expansion

This letter proposes a new precoding design scheme to improve the null-space expansion (NSE) for multi-user massive MIMO systems. In NSE, steering many nulls based on past channel state information (CSI) significantly improves inter-user interference (IUI) suppression capability in a time-varying ch...

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Bibliographic Details
Published inIEICE COMMUNICATIONS EXPRESS Vol. 10; no. 5; pp. 212 - 218
Main Authors Arai, Kabuto, Maruta, Kazuki, Ahn, Chang-Jun
Format Journal Article
LanguageEnglish
Published The Institute of Electronics, Information and Communication Engineers 01.05.2021
Subjects
channel prediction
massive MIMO
multiuser MIMO
null-space expansion
time-varying channels
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Summary:This letter proposes a new precoding design scheme to improve the null-space expansion (NSE) for multi-user massive MIMO systems. In NSE, steering many nulls based on past channel state information (CSI) significantly improves inter-user interference (IUI) suppression capability in a time-varying channel environment. However, extensive nullification consumes a part of the degree of freedom (DoF) resulting in the degradation of the desired signal gain. Our new proposal predicts the desired user’s channel state and derives the precoding weight to compensate for that loss. Computer simulation verifies the improved signal-to-interference-plus-noise power ratio (SINR) performance.
ISSN:2187-0136
2187-0136
DOI:10.1587/comex.2021XBL0012