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Paper Abstract and Keywords
Presentation 2026-10-27 16:40
[Poster Presentation] Null-Space Expansion Based on Predicted Subspaces for Time-Varying Massive MIMO Channels
Kohei Miura, Masaya Ueda, Kazuki Maruta (Tokyo Univ. Science)
Abstract (in Japanese) (See Japanese page) 
(in English) In multi-user Massive MIMO downlink transmission, channel state information (CSI) acquired using uplink reference signals becomes outdated due to channel variations caused by user mobility, resulting in inter-user interference.
Null-space expansion (NSE) has been proposed, which exploits the excess spatial degrees of freedom available in Massive MIMO to form nulls for each user using current and past CSI. Since the spatial degrees of freedom required for null formation are also used for desired-signal transmission, determining the optimal null-space while taking into account the trade-off between interference suppression and desired signal power degradation remains an important issue.
Assuming the Jakes channel model, we propose a method that predicts future CSI using linear combinations of past CSI and constructs the null-space by selecting directions with high predictable power over the interval.
The effectiveness of the proposed method is demonstrated through theoretical analysis.
Keyword (in Japanese) (See Japanese page) 
(in English) Multiuser Massive MIMO / Null-Space Expansion / Channel Prediction / Eigenmode Selection / Generalized Eigenvalue Problem / / /  
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Conference Information
Committee MIKA  
Conference Date 2026-10-26 - 2026-10-28 
Place (in Japanese) (See Japanese page) 
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Paper Information
Registration To MIKA 
Conference Code 2026-10-MIKA 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Null-Space Expansion Based on Predicted Subspaces for Time-Varying Massive MIMO Channels 
Sub Title (in English)  
Keyword(1) Multiuser Massive MIMO  
Keyword(2) Null-Space Expansion  
Keyword(3) Channel Prediction  
Keyword(4) Eigenmode Selection  
Keyword(5) Generalized Eigenvalue Problem  
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1st Author's Name Kohei Miura  
1st Author's Affiliation Tokyo University of Science (Tokyo Univ. Science)
2nd Author's Name Masaya Ueda  
2nd Author's Affiliation Tokyo University of Science (Tokyo Univ. Science)
3rd Author's Name Kazuki Maruta  
3rd Author's Affiliation Tokyo University of Science (Tokyo Univ. Science)
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Speaker Author-1 
Date Time 2026-10-27 16:40:00 
Presentation Time 90 minutes 
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