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Paper Abstract and Keywords
Presentation 2014-04-18 14:25
Subcarrier Smoothing Calibration on multiuser-MIMO-OFDM Systems with Implicit Feedback
Hayato Fukuzono, Tomoki Murakami, Riichi Kudo, Yasushi Takatori, Masato Mizoguchi (NTT) RCS2014-16
Abstract (in Japanese) (See Japanese page) 
(in English) It is necessary to calibrate uplink channel state information (CSI) estimated for transmit beamforming in frequency domain on multiuser multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems with implicit feedback (IFB). Calibration coefficients, by which uplink CSI is multiplied in the calibration, have some frequency correlation, because they depend on circuitry responses. In this paper, we propose subcarrier smoothing calibration, a scheme in which calibration coefficients are smoothed in frequency domain, to
improve calibration accuracy. In order to evaluate the effect of the proposed scheme for practical circuitry responses, we measure frequency responses of actual, commercial radio frequency (RF) transceiver circuits, and employ them for computer simulations. Simulation results show that the proposed scheme improves signal to interference plus
noise power ratio (SINR) compared with a conventional calibration scheme without the smoothing.
Keyword (in Japanese) (See Japanese page) 
(in English) multiuser MIMO / OFDM / implicit feedback / calibration / subcarrier smoothing / circuitry response / /  
Reference Info. IEICE Tech. Rep., vol. 114, no. 8, RCS2014-16, pp. 85-90, April 2014.
Paper # RCS2014-16 
Date of Issue 2014-04-10 (RCS) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
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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 RCS2014-16

Conference Information
Committee RCS  
Conference Date 2014-04-17 - 2014-04-18 
Place (in Japanese) (See Japanese page) 
Place (in English) Nagoya Institute of Technology 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Radio Access Technologies, etc. 
Paper Information
Registration To RCS 
Conference Code 2014-04-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Subcarrier Smoothing Calibration on multiuser-MIMO-OFDM Systems with Implicit Feedback 
Sub Title (in English)  
Keyword(1) multiuser MIMO  
Keyword(2) OFDM  
Keyword(3) implicit feedback  
Keyword(4) calibration  
Keyword(5) subcarrier smoothing  
Keyword(6) circuitry response  
Keyword(7)  
Keyword(8)  
1st Author's Name Hayato Fukuzono  
1st Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT)
2nd Author's Name Tomoki Murakami  
2nd Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT)
3rd Author's Name Riichi Kudo  
3rd Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT)
4th Author's Name Yasushi Takatori  
4th Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT)
5th Author's Name Masato Mizoguchi  
5th Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT)
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Speaker Author-1 
Date Time 2014-04-18 14:25:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2014-16 
Volume (vol) vol.114 
Number (no) no.8 
Page pp.85-90 
#Pages
Date of Issue 2014-04-10 (RCS) 


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