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Paper Abstract and Keywords
Presentation 2011-12-15 09:10
Investigation of Dual Threshold Scaling Factors for Bit Flip Decoding
Julian Webber, Toshihiko Nishimura, Takeo Ohgane, Yasutaka Ogawa (Hokkaido Univ.) RCS2011-232
Abstract (in Japanese) (See Japanese page) 
(in English) Very low error rates can be obtained using low-density parity-check (LDPC) codes and their use is now common in new communications standards such as the Long Term Evolution (LTE) Advanced. The decoders based on belief propagation offer excellent performance but have high complexity. Therefore simpler architectures based on the bit flipping algorithm have been researched. Over the last two years a few adaptive threshold algorithms have been proposed in which a bit is either inverted if it is below a threshold, or the threshold itself is lowered using a scaling factor. This work looks at how the scaling factor influences the iteration count and error performance. We propose an algorithm that switches between two scaling factors based on the syndrome sum on each branch. Using this technique we show that the error performance is comparable with that of a single scaling factor but the iteration count is significantly reduced. Further, if a non-transmitted codeword is detected, which corresponds to a trapped search point, an addition of a small noise perturbation can potentially provide an escape opportunity and this is experimentally investigated.
Keyword (in Japanese) (See Japanese page) 
(in English) bit-flip decoding / adaptive threshold / LDPC / gradient descent / low-complexity / / /  
Reference Info. IEICE Tech. Rep., vol. 111, no. 345, RCS2011-232, pp. 1-6, Dec. 2011.
Paper # RCS2011-232 
Date of Issue 2011-12-08 (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)
Download PDF RCS2011-232

Conference Information
Committee NS RCS  
Conference Date 2011-12-15 - 2011-12-16 
Place (in Japanese) (See Japanese page) 
Place (in English) Yamaguchi University 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Mobile Ad-hoc Network, Ubiquitous Network, Wireless Communication, security, Multi-Access Network 
Paper Information
Registration To RCS 
Conference Code 2011-12-NS-RCS 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Investigation of Dual Threshold Scaling Factors for Bit Flip Decoding 
Sub Title (in English)  
Keyword(1) bit-flip decoding  
Keyword(2) adaptive threshold  
Keyword(3) LDPC  
Keyword(4) gradient descent  
Keyword(5) low-complexity  
1st Author's Name Julian Webber  
1st Author's Affiliation Hokkaido University (Hokkaido Univ.)
2nd Author's Name Toshihiko Nishimura  
2nd Author's Affiliation Hokkaido University (Hokkaido Univ.)
3rd Author's Name Takeo Ohgane  
3rd Author's Affiliation Hokkaido University (Hokkaido Univ.)
4th Author's Name Yasutaka Ogawa  
4th Author's Affiliation Hokkaido University (Hokkaido Univ.)
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Date Time 2011-12-15 09:10:00 
Presentation Time 25 
Registration for RCS 
Paper # IEICE-RCS2011-232 
Volume (vol) IEICE-111 
Number (no) no.345 
Page pp.1-6 
#Pages IEICE-6 
Date of Issue IEICE-RCS-2011-12-08 

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