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Paper Abstract and Keywords
Presentation 2007-10-16 10:30
Proposal of Demodulation Method for OFDM Systems under Multi-path Fading with Delay Spread Greater than Guard Interval
Kazuya Moriwaki, Katsuhiro Naito, Kazuo Mori, Hideo Kobayashi (Mie Univ.) WBS2007-43
Abstract (in Japanese) (See Japanese page) 
(in English) The orthogonal frequency division multiplexing (OFDM) technique has been recently received considerable attention in the fields of wireless communications due to its efficient usage of frequency bandwidth and robustness against the multi-path fading. However, the bit error rate (BER) performance of OFDM technique would be degraded severely due to inter carrier interference (ICI) and inter symbol interference (ISI) when the delay spread is larger than the predetermined guard interval (GI). We have proposed a demodulation method for OFDM system, which can achieve the better BER performance under the multi-path fading environments even when the delay spread is larger than the GI. The feature of proposed method is to reconstruct the delay signals exceeding the GI and compensate them by using the estimated time domain channel impulse response and the temporary decision data information. In this paper, we apply Forward Error Correction (FEC) technique to our proposed method, and demonstrate its transmission performance under various mobile conditions in order to verify the effectiveness of the proposed method as comparing with the conventional method.
Keyword (in Japanese) (See Japanese page) 
(in English) OFDM / Guard Interval / ISI / ICI / Maximum Likelihood (ML) / / /  
Reference Info. IEICE Tech. Rep., vol. 107, no. 257, WBS2007-43, pp. 25-30, Oct. 2007.
Paper # WBS2007-43 
Date of Issue 2007-10-09 (WBS) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
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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)
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Conference Information
Committee WBS  
Conference Date 2007-10-15 - 2007-10-16 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To WBS 
Conference Code 2007-10-WBS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Proposal of Demodulation Method for OFDM Systems under Multi-path Fading with Delay Spread Greater than Guard Interval 
Sub Title (in English)  
Keyword(1) OFDM  
Keyword(2) Guard Interval  
Keyword(3) ISI  
Keyword(4) ICI  
Keyword(5) Maximum Likelihood (ML)  
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1st Author's Name Kazuya Moriwaki  
1st Author's Affiliation Mie University (Mie Univ.)
2nd Author's Name Katsuhiro Naito  
2nd Author's Affiliation Mie University (Mie Univ.)
3rd Author's Name Kazuo Mori  
3rd Author's Affiliation Mie University (Mie Univ.)
4th Author's Name Hideo Kobayashi  
4th Author's Affiliation Mie University (Mie Univ.)
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Speaker Author-1 
Date Time 2007-10-16 10:30:00 
Presentation Time 25 minutes 
Registration for WBS 
Paper # WBS2007-43 
Volume (vol) vol.107 
Number (no) no.257 
Page pp.25-30 
#Pages 6 
Date of Issue 2007-10-09 (WBS) 

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