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Paper Abstract and Keywords
Presentation 2025-12-18 09:45
Equalization for Diagonal Elements of Triangular Matrices and Application to Overloaded MIMO Systems
Katsuya Aoki, Satoshi Denno, Yafei Hou, (Okayama Univ.) RCS2025-185
Abstract (in Japanese) (See Japanese page) 
(in English) In this paper, we propose a method for generating linear receive filters for linear overloaded MIMO systems can transmit and receive more signal streams than the number of transmit or receive antennas.
This overloaded MIMO system consists of an MMSE (Minimum Mean Square Error) precoder and a linear receiver filter, SNR (Signal to Noise Power Ratio) of the received signal depends on the characteristics of the receive filter.
This receive filter is generated using the channel matrix and a unitary matrix that performs upper triangulation.
To reduce the variance of noise components occurring in each multiplexed stream, we propose a new triangulation method that equalizes the diagonal elements of the upper triangular matrix constituting the noise components.
We verify the performance of the overload MIMO system using the spatial receive filter generated by the proposed triangulation method through the simulation.
We confirm that spatial multiplexing of signals exceeding the number of transmit and receive antennas is achievable for any MIMO channel from the simulation.
Keyword (in Japanese) (See Japanese page) 
(in English) MIMO / Overload MIMO / Spatial receive filter / / / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 302, RCS2025-185, pp. 7-12, Dec. 2025.
Paper # RCS2025-185 
Date of Issue 2025-12-11 (RCS) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF RCS2025-185

Conference Information
Committee NS RCS  
Conference Date 2025-12-18 - 2025-12-19 
Place (in Japanese) (See Japanese page) 
Place (in English) Fukui International Activities Plaza + Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Multi-hop/Relay/Cooperation, Disaster-resistant wireless network, Sensor/Mesh network, Ad-hoc network, D2D/M2M, Wireless network coding, Handover/AP switching/Connected cell control/Load balancing among base stations/Mobile network dynamic reconfiguration, QoS/QoE assurance, Wireless VoIP, IoT, Edge computing, etc. 
Paper Information
Registration To RCS 
Conference Code 2025-12-NS-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Equalization for Diagonal Elements of Triangular Matrices and Application to Overloaded MIMO Systems 
Sub Title (in English)  
Keyword(1) MIMO  
Keyword(2) Overload MIMO  
Keyword(3) Spatial receive filter  
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1st Author's Name Katsuya Aoki  
1st Author's Affiliation Okayama University (Okayama Univ.)
2nd Author's Name Satoshi Denno  
2nd Author's Affiliation Okayama University (Okayama Univ.)
3rd Author's Name Yafei Hou,  
3rd Author's Affiliation Okayama University (Okayama Univ.)
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Speaker Author-1 
Date Time 2025-12-18 09:45:00 
Presentation Time 20 minutes 
Registration for RCS 
Paper # RCS2025-185 
Volume (vol) vol.125 
Number (no) no.302 
Page pp.7-12 
#Pages 6 
Date of Issue 2025-12-11 (RCS) 

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