Paper Abstract and Keywords |
Presentation |
2009-03-09 10:50
Error-Trellis State Complexity of LDPC Convolutional Codes Based on Circulant Matrices Masato Tajima, Koji Okino, Takashi Miyagoshi (Univ. of Toyama) IT2008-61 ISEC2008-119 WBS2008-74 |
Abstract |
(in Japanese) |
(See Japanese page) |
(in English) |
Let H(D) be the parity-check matrix of an LDPC convolutional code corresponding to the parity-check matrix H of a quasi-cyclic (QC) code obtained using the method of Tanner et al. We see that the entries in H(D) are all monomials and several rows (columns) have monomial factors. Let us cyclically shift the rows of H. Then the parity-check matrix H'(D) corresponding to the modified matrix H' defines another convolutional code. However, its free distance is lower-bounded by the minimum distance of the original QC code. Also, each row (column) of H'(D) has a factor different from the one in H(D). Noting these facts, we show that the state-space complexity of the error-trellis associated with H'(D) can be significantly reduced by controlling the row shifts applied to H with the error-correcting capability being preserved. |
Keyword |
(in Japanese) |
(See Japanese page) |
(in English) |
circulant matrices / QC codes / LDPC convolutional codes / error-trellis / state complexity / / / |
Reference Info. |
IEICE Tech. Rep., vol. 108, no. 472, IT2008-61, pp. 109-116, March 2009. |
Paper # |
IT2008-61 |
Date of Issue |
2009-03-02 (IT, ISEC, WBS) |
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) |
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IT2008-61 ISEC2008-119 WBS2008-74 |
Conference Information |
Committee |
WBS IT ISEC |
Conference Date |
2009-03-09 - 2009-03-10 |
Place (in Japanese) |
(See Japanese page) |
Place (in English) |
Hakodate Mirai Univ. |
Topics (in Japanese) |
(See Japanese page) |
Topics (in English) |
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Paper Information |
Registration To |
IT |
Conference Code |
2009-03-WBS-IT-ISEC |
Language |
English |
Title (in Japanese) |
(See Japanese page) |
Sub Title (in Japanese) |
(See Japanese page) |
Title (in English) |
Error-Trellis State Complexity of LDPC Convolutional Codes Based on Circulant Matrices |
Sub Title (in English) |
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Keyword(1) |
circulant matrices |
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QC codes |
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LDPC convolutional codes |
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error-trellis |
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state complexity |
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1st Author's Name |
Masato Tajima |
1st Author's Affiliation |
University of Toyama (Univ. of Toyama) |
2nd Author's Name |
Koji Okino |
2nd Author's Affiliation |
University of Toyama (Univ. of Toyama) |
3rd Author's Name |
Takashi Miyagoshi |
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University of Toyama (Univ. of Toyama) |
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Speaker |
Author-1 |
Date Time |
2009-03-09 10:50:00 |
Presentation Time |
25 minutes |
Registration for |
IT |
Paper # |
IT2008-61, ISEC2008-119, WBS2008-74 |
Volume (vol) |
vol.108 |
Number (no) |
no.472(IT), no.473(ISEC), no.474(WBS) |
Page |
pp.109-116 |
#Pages |
8 |
Date of Issue |
2009-03-02 (IT, ISEC, WBS) |
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