| Presentation | 2009-03-09 Error-Trellis State Complexity of LDPC Convolutional Codes Based on Circulant Matrices Masato TAJIMA, Koji OKINO, Takashi MIYAGOSHI, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(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) |
| Keyword(in English) | circulant matrices / QC codes / LDPC convolutional codes / error-trellis / state complexity |
| Paper # | IT2008-61,ISEC2008-119,WBS2008-74 |
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| Conference Information | |
| Committee | WBS |
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| Conference Date | 2009/3/2(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Wideband System(WBS) |
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| Language | ENG |
| 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) | |
| Keyword(1) | circulant matrices |
| Keyword(2) | QC codes |
| Keyword(3) | LDPC convolutional codes |
| Keyword(4) | error-trellis |
| Keyword(5) | state complexity |
| 1st Author's Name | Masato TAJIMA |
| 1st Author's Affiliation | Graduate School of Science and Engineering, University of Toyama() |
| 2nd Author's Name | Koji OKINO |
| 2nd Author's Affiliation | Information Technology Center, University of Toyama |
| 3rd Author's Name | Takashi MIYAGOSHI |
| 3rd Author's Affiliation | Graduate School of Science and Engineering, University of Toyama |
| Date | 2009-03-09 |
| Paper # | IT2008-61,ISEC2008-119,WBS2008-74 |
| Volume (vol) | vol.108 |
| Number (no) | 474 |
| Page | pp.pp.- |
| #Pages | 8 |
| Date of Issue | |