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Paper Abstract and Keywords
Presentation 2009-03-02 11:10
Reliable OFDM Mobile Radio Relaying Systems with AF/DF Switching Scheme and Bit LLR Combining Reception
Kenji Goto, Kazuhiko Fukawa, Satoshi Suyama, Hiroshi Suzuki (Tokyo Inst. of Tech.) CAS2008-106 SIP2008-169 CS2008-80
Abstract (in Japanese) (See Japanese page) 
(in English) This report investigates a relaying system for mobile communications that switches between (i) Amplify-and-Forward (AF) to forward analog signals including noise and (ii) Decode-and-Forward (DF) to forward detected signals. The system selects AF and DF when a CRC decoder in the relay detects any errors and does not, respectively. In the case of DF, the relay also performs different decoding from that in the source, which is expected to bring about as high reliability as hybrid ARQ. On a receiver side, the destination needs to calculate log likelihood ratios (LLRs) of coded bits for decoding. To provide LLRs, a proposed scheme estimates channel impulse responses of desired signals and average powers of replica errors. Using these estimates, it obtains combining weights for metrics of received signals via the source and relay. Computer simulations of OFDM transmission under multipath fading conditions demonstrate the following three items: (i) the switching scheme outperforms AF and DF, (ii) the different decoding in the case of DF can be superior to the same decoding in packet error rate (PER) with high SNR at the relay and high coding rate, and (iii) degradation of PER by the channel estimation can be negligible under a quasi static channel condition.
Keyword (in Japanese) (See Japanese page) 
(in English) Mobile communications / relaying system / AF / DF / switching scheme / bit LLR / OFDM / channel estimation  
Reference Info. IEICE Tech. Rep., vol. 108, no. 455, CS2008-80, pp. 31-36, March 2009.
Paper # CS2008-80 
Date of Issue 2009-02-23 (CAS, SIP, CS) 
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 CAS2008-106 SIP2008-169 CS2008-80

Conference Information
Committee CAS CS SIP  
Conference Date 2009-03-02 - 2009-03-03 
Place (in Japanese) (See Japanese page) 
Place (in English) Nagaragawa Convention Center 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Network processors, signal processing for communications, wireless LAN/PAN, etc. 
Paper Information
Registration To CS 
Conference Code 2009-03-CAS-CS-SIP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Reliable OFDM Mobile Radio Relaying Systems with AF/DF Switching Scheme and Bit LLR Combining Reception 
Sub Title (in English)  
Keyword(1) Mobile communications  
Keyword(2) relaying system  
Keyword(3) AF  
Keyword(4) DF  
Keyword(5) switching scheme  
Keyword(6) bit LLR  
Keyword(7) OFDM  
Keyword(8) channel estimation  
1st Author's Name Kenji Goto  
1st Author's Affiliation Tokyo Institute of Technology University (Tokyo Inst. of Tech.)
2nd Author's Name Kazuhiko Fukawa  
2nd Author's Affiliation Tokyo Institute of Technology University (Tokyo Inst. of Tech.)
3rd Author's Name Satoshi Suyama  
3rd Author's Affiliation Tokyo Institute of Technology University (Tokyo Inst. of Tech.)
4th Author's Name Hiroshi Suzuki  
4th Author's Affiliation Tokyo Institute of Technology University (Tokyo Inst. of Tech.)
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Speaker Author-1 
Date Time 2009-03-02 11:10:00 
Presentation Time 20 minutes 
Registration for CS 
Paper # CAS2008-106, SIP2008-169, CS2008-80 
Volume (vol) vol.108 
Number (no) no.453(CAS), no.454(SIP), no.455(CS) 
Page pp.31-36 
#Pages 6 
Date of Issue 2009-02-23 (CAS, SIP, CS) 

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