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Efficient erasure correcting codes (2001)
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| Venue: | IEEE TRANSACTIONS ON INFORMATION THEORY |
| Citations: | 356 - 27 self |
BibTeX
@ARTICLE{Luby01efficienterasure,
author = {Michael G. Luby and Michael Mitzenmacher and M. Amin Shokrollahi and Daniel A. Spielman},
title = {Efficient erasure correcting codes},
journal = {IEEE TRANSACTIONS ON INFORMATION THEORY},
year = {2001},
volume = {47},
pages = {569--584}
}
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Abstract
We introduce a simple erasure recovery algorithm for codes derived from cascades of sparse bipartite graphs and analyze the algorithm by analyzing a corresponding discrete-time random process. As a result, we obtain a simple criterion involving the fractions of nodes of different degrees on both sides of the graph which is necessary and sufficient for the decoding process to finish successfully with high probability. By carefully designing these graphs we can construct for any given rate and any given real number a family of linear codes of rate which can be encoded in time proportional to ��@I A times their block length. Furthermore, a codeword can be recovered with high probability from a portion of its entries of length @IC A or more. The recovery algorithm also runs in time proportional to ��@I A. Our algorithms have been implemented and work well in practice; various implementation issues are discussed.
Keyphrases
efficient erasure high probability simple erasure recovery algorithm corresponding discrete-time random process block length length ic recovery algorithm various implementation issue index term erasure channel linear code decoding process different degree large deviation analysis simple criterion real number sparse bipartite graph lowdensity parity-check code
