CUED Publications database

Weaknesses of Margulis and Ramanujan-Margulis low-density parity-check codes

MacKay, DJC and Postol, MS (2003) Weaknesses of Margulis and Ramanujan-Margulis low-density parity-check codes. Electronic Notes in Theoretical Computer Science, 74. pp. 99-106. ISSN 1571-0661

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Abstract

We report weaknesses in two algebraic constructions of low-density parity-check codes based on expander graphs. The Margulis construction gives a code with near-codewords, which cause problems for the sum-product decoder; The Ramanujan-Margulis construction gives a code with low-weight codewords, which produce an error-floor. © 2004 Elsevier B.V.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div F > Machine Intelligence
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:26
Last Modified: 14 Dec 2014 17:46
DOI: 10.1016/S1571-0661(04)80768-0