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Paper Abstract and Keywords
Presentation 2012-10-19 16:45
Precoding Weight Interpolation Method to Mitigate Spectrum Efficiency Loss of Vector Perturbation Based Multiuser MIMO with Limited CSI Feedback
Yafei Hou, Satoshi Sonobe, Satoshi Tsukamoto, Kazuto Yano, Masahiro Uno, Kiyoshi Kobayashi (ATR) RCS2012-159
Abstract (in Japanese) (See Japanese page) 
(in English) Vector perturbation (VP) algorithm requires perfect channel state information (CSI) for optimal perturbation vector search and generating a spatial filter to pre-equalize the MIMO channel function. Due to the limited CSI feedback and realistic computational complexity (CC) due to hardware implementation, MU-MIMO OFDM system will yield the inefficient perturbated vector and mismatched spatial filter which causes large spectrum efficiency (SE) loss. In this paper, by simulation, it shows that most of performance loss of VP algorithm is derived from the mismatched spatial filter. Therefore, we propose a low-complexity linear interpolation for spatial filter to reduce the SE loss. The proposed interpolation scheme firstly rebuilds the CSI of partial subcarriers from limited feedback CSI by time and frequency domain transformation (TFT). After that, the spatial filter matrices of these partial subcarriers are calculated. Finally the spatial filter matrices of all subcarriers are interpolated by a linear interpolation. The complexity analysis and simulated results show that the proposed interpolation scheme can reduce the SE loss of VP based MU-MIMO OFDM system with low computational complexity.
Keyword (in Japanese) (See Japanese page) 
(in English) Vector Perturbation / MU-MIMO / Limited CSI Feedback / Computational Complexity / Spectrum Efficiency / Precoding Interpolation / Linear Interpolation / MIMO Spatial Filter  
Reference Info. IEICE Tech. Rep., vol. 112, no. 239, RCS2012-159, pp. 195-200, Oct. 2012.
Paper # RCS2012-159 
Date of Issue 2012-10-10 (RCS) 
ISSN Print edition: ISSN 0913-5685    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)
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Conference Information
Committee SR AN USN RCS  
Conference Date 2012-10-17 - 2012-10-19 
Place (in Japanese) (See Japanese page) 
Place (in English) Fukuoka univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) wireless distributed network, general topics 
Paper Information
Registration To RCS 
Conference Code 2012-10-SR-AN-USN-RCS 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Precoding Weight Interpolation Method to Mitigate Spectrum Efficiency Loss of Vector Perturbation Based Multiuser MIMO with Limited CSI Feedback 
Sub Title (in English)  
Keyword(1) Vector Perturbation  
Keyword(2) MU-MIMO  
Keyword(3) Limited CSI Feedback  
Keyword(4) Computational Complexity  
Keyword(5) Spectrum Efficiency  
Keyword(6) Precoding Interpolation  
Keyword(7) Linear Interpolation  
Keyword(8) MIMO Spatial Filter  
1st Author's Name Yafei Hou  
1st Author's Affiliation Advanced Telecommunications Research Institute International (ATR)
2nd Author's Name Satoshi Sonobe  
2nd Author's Affiliation Advanced Telecommunications Research Institute International (ATR)
3rd Author's Name Satoshi Tsukamoto  
3rd Author's Affiliation Advanced Telecommunications Research Institute International (ATR)
4th Author's Name Kazuto Yano  
4th Author's Affiliation Advanced Telecommunications Research Institute International (ATR)
5th Author's Name Masahiro Uno  
5th Author's Affiliation Advanced Telecommunications Research Institute International (ATR)
6th Author's Name Kiyoshi Kobayashi  
6th Author's Affiliation Advanced Telecommunications Research Institute International (ATR)
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Speaker Author-1 
Date Time 2012-10-19 16:45:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2012-159 
Volume (vol) vol.112 
Number (no) no.239 
Page pp.195-200 
#Pages 6 
Date of Issue 2012-10-10 (RCS) 

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