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Paper Abstract and Keywords
Presentation 2014-03-05 10:55
An Adaptive Dual-mode DFCE with Scattered Pilots for Fading Condition
Sho Sumitani, Fumio Takahata (Waseda Univ.) RCS2013-378
Abstract (in Japanese) (See Japanese page) 
(in English) In an application of a dual-mode decision feedback channel estimation to a COFDM transmission with scattered pilot symbols, there would be three kinds of possible methods to process or select forward and backward channels estimated values. These are to average the values, to select one direction values from both direction values based on a path metric value of Viterbi decoding, and to select a value from values based on LLR (Log-Likelihood Ratio) value. Effective methods to obtain accurate estimated channel values in frequency and time directions depend on a fading condition characterized respectively by a delay spread and Doppler frequency. An exact detection of fading conditions requires a complicated signal processing for unstable and variable delay spread and Doppler frequency and is desirable to be removed from the channel estimation. The paper proposes a scheme to select an effective one from the three methods for frequency and time directions without a detection of fading conditions, which selects the methods based on path metric values. Computer simulation results show that the proposed approach provides the same channel estimation performance as that obtained under an exact detection of fading conditions.
Keyword (in Japanese) (See Japanese page) 
(in English) COFDM transmission / Dual-mode decision feedback channel estimation / Scattered pilot / Convolutional encoding/Viterbi decoding / Log-Likelihood Ratio / / /  
Reference Info. IEICE Tech. Rep., vol. 113, no. 456, RCS2013-378, pp. 437-442, March 2014.
Paper # RCS2013-378 
Date of Issue 2014-02-24 (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 2014-03-03 - 2014-03-05 
Place (in Japanese) (See Japanese page) 
Place (in English) Waseda Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Mobile Communication Workshop 
Paper Information
Registration To RCS 
Conference Code 2014-03-RCS-SR-SRW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) An Adaptive Dual-mode DFCE with Scattered Pilots for Fading Condition 
Sub Title (in English)  
Keyword(1) COFDM transmission  
Keyword(2) Dual-mode decision feedback channel estimation  
Keyword(3) Scattered pilot  
Keyword(4) Convolutional encoding/Viterbi decoding  
Keyword(5) Log-Likelihood Ratio  
1st Author's Name Sho Sumitani  
1st Author's Affiliation Waseda University (Waseda Univ.)
2nd Author's Name Fumio Takahata  
2nd Author's Affiliation Waseda University (Waseda Univ.)
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Date Time 2014-03-05 10:55:00 
Presentation Time 20 
Registration for RCS 
Paper # IEICE-RCS2013-378 
Volume (vol) IEICE-113 
Number (no) no.456 
Page pp.437-442 
#Pages IEICE-6 
Date of Issue IEICE-RCS-2014-02-24 

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