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Paper Abstract and Keywords
Presentation 2015-03-06 15:25
Iterative Reception Employing Sparse Channel Estimation for OFDM Systems
Yuta Takahashi, Kazuhiko Fukawa, Hiroshi Suzuki, Yuyuan Chang (Tokyo Tech) RCS2014-372
Abstract (in Japanese) (See Japanese page) 
(in English) OFDM transmission schemes are adopted for the integrated services digital broadcasting-terrestrial (ISDB-T) and the downlink of LTE. Their wireless channels are likely to be frequency selective fading in which absolute values of many propagation paths are negligible, that is sparse channels. In addition, when the receiver moves rapidly, the channel varies fast due to the Doppler effect and the accuracy of channel estimation deteriorates significantly. In order to alleviate its deterioration, the iterative channel estimation scheme with the tap selection and the LMS algorithm exploiting the log-likelihood ratio (LLR) of the coded bits from the decoder has been studied. For further improvement of the channel esimation accuracy, this report investigates a channel estimaion scheme employing the optimization method with $ell_1$ norm regularization, called a Fast Iterative Shrinkage-Thresholding Algorithm (FISTA), and proposes the iterative reception for OFDM systems employing such a channel estimation scheme. For both the initial channel estimation using scattered-pilots (SPs) of several symbols and the soft decision directed channel estimaion (SDCE) using replicas of transmitted signals, the proposed method to apply FISTA can estimate the sparse channel more precisely than the least squares method. For evaluating the performance of the proposed method, computer simulations following ISDB-T with SP-OFDM are conducted. It is shown that the proposed method can estimate the sparse channel impulse response much more accurately than the conventional method.
Keyword (in Japanese) (See Japanese page) 
(in English) mobile communication / scattered-pilot OFDM / decision-directed channel estimation / $ell_1$ regularization / sparse channel estimation / / /  
Reference Info. IEICE Tech. Rep., vol. 114, no. 490, RCS2014-372, pp. 423-428, March 2015.
Paper # RCS2014-372 
Date of Issue 2015-02-25 (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 SR SRW  
Conference Date 2015-03-04 - 2015-03-06 
Place (in Japanese) (See Japanese page) 
Place (in English) Tokyo Institute of Technology 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Mobile Communication Workshop 
Paper Information
Registration To RCS 
Conference Code 2015-03-RCS-SR-SRW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Iterative Reception Employing Sparse Channel Estimation for OFDM Systems 
Sub Title (in English)  
Keyword(1) mobile communication  
Keyword(2) scattered-pilot OFDM  
Keyword(3) decision-directed channel estimation  
Keyword(4) $ell_1$ regularization  
Keyword(5) sparse channel estimation  
1st Author's Name Yuta Takahashi  
1st Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
2nd Author's Name Kazuhiko Fukawa  
2nd Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
3rd Author's Name Hiroshi Suzuki  
3rd Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
4th Author's Name Yuyuan Chang  
4th Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
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Speaker Author-1 
Date Time 2015-03-06 15:25:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2014-372 
Volume (vol) vol.114 
Number (no) no.490 
Page pp.423-428 
Date of Issue 2015-02-25 (RCS) 

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