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Paper Abstract and Keywords
Presentation 2015-07-29 13:35
Block Lower Multi-diagonalization for Multiuser MIMO Downlink
Hiroshi Nishimoto, Akinori Taira, Akihiro Okazaki, Atsushi Okamura (Mitsubishi Electric Corp.) RCS2015-101
Abstract (in Japanese) (See Japanese page) 
(in English) For multiuser-MIMO (MU-MIMO) downlink, the authors propose a novel precoding concept of block lower multi-diagonalization. Extending the conventional block diagonalization method, the proposed precoder for the desired user is computed to incorporate a predetermined number of interfering users. Consequently, the concept enables us to ensure the extra degree of freedom at the transmit array even after null steering in a linear MU-MIMO strategy, and also to reduce computational load at transmit precanceling in a nonlinear MU-MIMO strategy. From an implementational viewpoint, we here examine two approaches: block bi-diagonalization, allowing one interfering user, and block lower tri-diagonalization, allowing up to two interfering users. In the paper, we reveal the significant potential of the proposed concept through the discussion and numerical evaluation using sum-rate capacity.
Keyword (in Japanese) (See Japanese page) 
(in English) multiuser-MIMO / MU-MIMO / inter-user interference / IUI / precoding / block lower multi-diagonalization / /  
Reference Info. IEICE Tech. Rep., vol. 115, no. 160, RCS2015-101, pp. 7-12, July 2015.
Paper # RCS2015-101 
Date of Issue 2015-07-22 (RCS) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
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 RCS2015-101

Conference Information
Committee RCC ASN RCS NS SR  
Conference Date 2015-07-29 - 2015-07-31 
Place (in Japanese) (See Japanese page) 
Place (in English) JA Naganoken Bldg. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Wireless Distributed Network, M2M: Machine-to-Machine, D2D (Device-to-Device),etc. 
Paper Information
Registration To RCS 
Conference Code 2015-07-RCC-ASN-RCS-NS-SR 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Block Lower Multi-diagonalization for Multiuser MIMO Downlink 
Sub Title (in English)  
Keyword(1) multiuser-MIMO  
Keyword(2) MU-MIMO  
Keyword(3) inter-user interference  
Keyword(4) IUI  
Keyword(5) precoding  
Keyword(6) block lower multi-diagonalization  
1st Author's Name Hiroshi Nishimoto  
1st Author's Affiliation Mitsubishi Electric Corporation (Mitsubishi Electric Corp.)
2nd Author's Name Akinori Taira  
2nd Author's Affiliation Mitsubishi Electric Corporation (Mitsubishi Electric Corp.)
3rd Author's Name Akihiro Okazaki  
3rd Author's Affiliation Mitsubishi Electric Corporation (Mitsubishi Electric Corp.)
4th Author's Name Atsushi Okamura  
4th Author's Affiliation Mitsubishi Electric Corporation (Mitsubishi Electric Corp.)
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Date Time 2015-07-29 13:35:00 
Presentation Time 25 
Registration for RCS 
Paper # IEICE-RCS2015-101 
Volume (vol) IEICE-115 
Number (no) no.160 
Page pp.7-12 
#Pages IEICE-6 
Date of Issue IEICE-RCS-2015-07-22 

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