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Paper Abstract and Keywords
Presentation 2007-01-24 11:40
Channel Estimation Method Using Differential Model of Fading Fluctuation for EM Algorithm Applied to Mobile OFDM MAP Detection
Kazushi Muraoka, Hiroshi Suzuki, Kazuhiko Fukawa, Satoshi Suyama (Tokyo Tech) SIP2006-124 RCS2006-182
Abstract (in Japanese) (See Japanese page) 
(in English) The EM algorithm has been applied to the MAP detection, because the latter requires a prohibitive amount of computational complexity and the former can reduce such complexity to a feasible amount by recursive approximation.
Applications of the EM algorithm to mobile communications can be classified into two categories.
One regards transmitted signals as hidden variables and recursively performs MAP-based channel estimation.
The other regards channel impulse responses as hidden variables and recursively performs MAP-based signal detection of the transmitted signals.
This report compares these two categories and investigates the MAP detection following the former for OFDM mobile communications.
As for its channel estimation, conventional schemes using the EM algorithm assume the random walk model as a process equation for the channel impulse response, and thus have insufficient tracking ability to fading fluctuation under a fast fading condition.
To improve the tracking ability, this report proposes a new channel estimation method for the EM algorithm that employs a differential model having the first and high order differentials of the channel impulse response with respect to time.
Computer simulations under the fast fading condition demonstrate that the proposed method is much superior in packet error rate to the conventional EM algorithm employing the random walk model.
Keyword (in Japanese) (See Japanese page) 
(in English) Mobile communication / OFDM / EM algorithm / channel estimation / RLS / differential model / /  
Reference Info. IEICE Tech. Rep., vol. 106, no. 478, RCS2006-182, pp. 43-48, Jan. 2007.
Paper # RCS2006-182 
Date of Issue 2007-01-17 (SIP, 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)
Download PDF SIP2006-124 RCS2006-182

Conference Information
Committee RCS SIP  
Conference Date 2007-01-24 - 2007-01-26 
Place (in Japanese) (See Japanese page) 
Place (in English) NICT Okinawa 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To RCS 
Conference Code 2007-01-RCS-SIP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Channel Estimation Method Using Differential Model of Fading Fluctuation for EM Algorithm Applied to Mobile OFDM MAP Detection 
Sub Title (in English)  
Keyword(1) Mobile communication  
Keyword(2) OFDM  
Keyword(3) EM algorithm  
Keyword(4) channel estimation  
Keyword(5) RLS  
Keyword(6) differential model  
Keyword(7)  
Keyword(8)  
1st Author's Name Kazushi Muraoka  
1st Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
2nd Author's Name Hiroshi Suzuki  
2nd Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
3rd Author's Name Kazuhiko Fukawa  
3rd Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
4th Author's Name Satoshi Suyama  
4th Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
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Speaker Author-1 
Date Time 2007-01-24 11:40:00 
Presentation Time 20 minutes 
Registration for RCS 
Paper # SIP2006-124, RCS2006-182 
Volume (vol) vol.106 
Number (no) no.475(SIP), no.478(RCS) 
Page pp.43-48 
#Pages 6 
Date of Issue 2007-01-17 (SIP, RCS) 

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