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Error Correction Capability of Column-Weight-Three LDPC Codes Under the Gallager A Algorithm—Part II

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4 Author(s)
Chilappagari, S.K. ; Marvell Semicond., Inc., Santa Clara, CA, USA ; Nguyen, D.V. ; Vasic, B. ; Marcellin, M.W.

The relation between the girth and the error correction capability of column-weight-three LDPC codes under the Gallager A algorithm is investigated. It is shown that a column-weight-three LDPC code with Tanner graph of girth g ¿ 10 can correct all error patterns with up to (g/2-1) errors in at most g/2 iterations of the Gallager A algorithm. For codes with Tanner graphs of girth g ¿ 8, it is shown that girth alone cannot guarantee correction of all error patterns with up to (g/2-1) errors under the Gallager A algorithm. Sufficient conditions to correct (g/2-1) errors are then established by studying trapping sets.

Published in:

Information Theory, IEEE Transactions on  (Volume:56 ,  Issue: 6 )

Date of Publication:

June 2010

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