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Paper Abstract and Keywords
Presentation 2017-08-18 10:00
[Invited Lecture] Extension of Tomlinson-Harashima Precoding Technique Employing Perturbation Vector Search for Downlink MU-MIMO Systems
Manabu Mikami (SoftBank) SAT2017-31 RCS2017-161
Abstract (in Japanese) (See Japanese page) 
(in English) For downlink multi-user multi-input multi-output systems (DL-MU-MIMO), non-linear precoding (NLP) based on Tomlinson- Harashima precoding (THP) that determine the perturbation vector modulo operation are investigated as a promising scheme with a good balance between transmission performance improvement and the computation complexity compared to linear precoding. In order to improve the transmission performance of DL-MU-MIMO THP, the conventional works studied employing various approaches to DL-MU-MIMO THP such as minimum mean square error (MMSE) based successive pre-interference canceling and ordering of the transmission signals or lattice reduction of the MU-MIMO channel matrix, and their combination. Unfortunately, in these approaches, the transmission performance degradation is unavoidable compared to Vector Perturbation (VP) based DL-MU-MIMO (DL-MU-MIMO VP) with the ideal transmission performance. On the other hand, the recent works are investigating a novel approach of DL-MU-MIMO THP that achieve the same transmission performance as DL-MU-MIMO VP quite efficiently. The novel approach is expanded by the combination of selecting the a suitable candidate from various perturbation vector candidates and employing an efficient optimal solution search algorithm for determining the perturbation vector based on the modulo operation. This paper tries to survey DL-MU-MIMO THP while comparing to DL-MU-MIMO VP and introduces the various approaches including recent works to improve the transmission performance of DL-MU-MIMO THP.
Keyword (in Japanese) (See Japanese page) 
(in English) MU-MIMO / Non-Linear Precoding / Tomlinson-Harashima Precoding / Perturbation Vector / / / /  
Reference Info. IEICE Tech. Rep., vol. 117, no. 175, RCS2017-161, pp. 97-102, Aug. 2017.
Paper # RCS2017-161 
Date of Issue 2017-08-10 (SAT, 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)
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Conference Information
Committee RCS SAT  
Conference Date 2017-08-17 - 2017-08-18 
Place (in Japanese) (See Japanese page) 
Place (in English) Niigata Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Mobile Satellite Communications, Broadcasting, Error Correction, Wireless Communication Systems, etc. 
Paper Information
Registration To RCS 
Conference Code 2017-08-RCS-SAT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Extension of Tomlinson-Harashima Precoding Technique Employing Perturbation Vector Search for Downlink MU-MIMO Systems 
Sub Title (in English)  
Keyword(1) MU-MIMO  
Keyword(2) Non-Linear Precoding  
Keyword(3) Tomlinson-Harashima Precoding  
Keyword(4) Perturbation Vector  
1st Author's Name Manabu Mikami  
1st Author's Affiliation SoftBank (SoftBank)
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Date Time 2017-08-18 10:00:00 
Presentation Time 30 
Registration for RCS 
Paper # IEICE-SAT2017-31,IEICE-RCS2017-161 
Volume (vol) IEICE-117 
Number (no) no.174(SAT), no.175(RCS) 
Page pp.55-60(SAT), pp.97-102(RCS) 
#Pages IEICE-6 
Date of Issue IEICE-SAT-2017-08-10,IEICE-RCS-2017-08-10 

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