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Paper Abstract and Keywords
Presentation 2010-03-04 10:15
Joint channel estimation and LDPC decoding over MIMO channels by nonlinear optimization
Takefumi Kobayashi, Ryutaroh Matsumoto, Tomohiko Uyematsu (Tokyo Inst. of Tech.) IT2009-92 ISEC2009-100 WBS2009-71
Abstract (in Japanese) (See Japanese page) 
(in English) In wireless communication systems, a training sequence is often used to obtain the channel state information (CSI) and its estimate is assumed to have no error. However, this approach has the higher PER than joint maximum-likelihood channel estimation and decoding. Wadayama proposed efficient decoding algorithm for LDPC codes based on convex optimization. This decoding algorithm is designed for linear vector channels. In this paper, according to Wadayama method, we propose to replace joint Maximum-Likelihood Decoding (joint MLD) problem for MIMO systems with continuous optimization and apply the interior point method. ILSE algorithm is known as an approximate joint MLD algorithm. This algorithm iterate MLD respect to codeword and MLE respect to channel matrix. We also propose to combine proposed method with ILSE algirithm. Computer simulation shows that two proposed decoding algorithms achieves better PER performance with less complexity in many cases compared with conventional decoder.
Keyword (in Japanese) (See Japanese page) 
(in English) LDPC code / MIMO / joint MLD / continuous optimization / / / /  
Reference Info. IEICE Tech. Rep., vol. 109, no. 444, IT2009-92, pp. 135-140, March 2010.
Paper # IT2009-92 
Date of Issue 2010-02-25 (IT, ISEC, WBS) 
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)
Download PDF IT2009-92 ISEC2009-100 WBS2009-71

Conference Information
Committee IT ISEC WBS  
Conference Date 2010-03-04 - 2010-03-05 
Place (in Japanese) (See Japanese page) 
Place (in English) Nagano-Engineering Campus, Shinshu University 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To IT 
Conference Code 2010-03-IT-ISEC-WBS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Joint channel estimation and LDPC decoding over MIMO channels by nonlinear optimization 
Sub Title (in English)  
Keyword(1) LDPC code  
Keyword(2) MIMO  
Keyword(3) joint MLD  
Keyword(4) continuous optimization  
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1st Author's Name Takefumi Kobayashi  
1st Author's Affiliation Tokyo Institute of Technology (Tokyo Inst. of Tech.)
2nd Author's Name Ryutaroh Matsumoto  
2nd Author's Affiliation Tokyo Institute of Technology (Tokyo Inst. of Tech.)
3rd Author's Name Tomohiko Uyematsu  
3rd Author's Affiliation Tokyo Institute of Technology (Tokyo Inst. of Tech.)
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Speaker Author-1 
Date Time 2010-03-04 10:15:00 
Presentation Time 25 minutes 
Registration for IT 
Paper # IT2009-92, ISEC2009-100, WBS2009-71 
Volume (vol) vol.109 
Number (no) no.444(IT), no.445(ISEC), no.446(WBS) 
Page pp.135-140 
#Pages 6 
Date of Issue 2010-02-25 (IT, ISEC, WBS) 

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