90 lines
3.5 KiB
Plaintext
90 lines
3.5 KiB
Plaintext
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<TITLE> Software for Low Density Parity Check Codes </TITLE>
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</HEAD><BODY>
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<H1> Software for Low Density Parity Check Codes </H1>
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<P>Version in development.
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<P>This collection of programs and modules, written in C, is intended
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to support research and education concerning Low Density Parity Check
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(LDPC) codes. (Note, however, that the copyright notice no longer
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restricts use to these purposes). These error-correcting codes were
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invented by Robert Gallager in the early 1960's, and re-invented and
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shown to have very good performance by David MacKay and myself in the
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mid-1990's. The decoding algorithm for LDPC codes is related to that
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used for Turbo codes, and to probabilistic inference methods used in
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other fields. Variations on LDPC and Turbo codes are currently the
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best practical codes known, in terms of their ability to transmit data
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at rates approaching channel capacity with very low error probability.
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<p>This and past versions of the software are available <A
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HREF="http://www.cs.utoronto.ca/~radford/ldpc.software.html">here</A>,
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from <A HREF="http://www.cs.utoronto.ca/~radford/">Radford Neal<A>'s
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web page. The source code for this software is also <A
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HREF="http://github.com/radfordneal/LDPC-codes">hosted at Github</A>,
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where there is a <A HREF="http://radfordneal.github.com/LDPC-codes/">copy
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of these documentation pages</A> for the latest release. Github also
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provides facilities for bug reporting and discussion.
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<H2>Index to Documentation</H2>
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<A HREF="install.html">Download and installation instructions</A>
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<BLOCKQUOTE>
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How to get and compile the programs and modules.
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</BLOCKQUOTE>
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<A HREF="github.html">Github facilities</A>
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<BLOCKQUOTE>
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How to get the source repository, report bugs, etc.
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</BLOCKQUOTE>
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<A HREF="release.html">Release notes</A>
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<BLOCKQUOTE>
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A log of changes made in each release of this software.
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</BLOCKQUOTE>
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<A HREF="progs.html">Software and program usage documentation</A>
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<BLOCKQUOTE>
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General documentation on the methods implemented, and details of
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program usage.
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</BLOCKQUOTE>
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<A HREF="examples.html">Examples of program usage</A>
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<BLOCKQUOTE>
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Examples using simple Hamming codes, and using more interesting LDPC codes.
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</BLOCKQUOTE>
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<A HREF="modify.html">How to modify the programs</A>
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<BLOCKQUOTE>
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Notes on how to add new channel types, new decoding methods, etc.
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</BLOCKQUOTE>
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<A HREF="modules.html">Module documentation</A>
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<BLOCKQUOTE>
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Modules used by the programs for modulo-2 matrix
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operations and random number generation.
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</BLOCKQUOTE>
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<A HREF="refs.html">References</A>
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<BLOCKQUOTE>
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Classic and more recent papers on LDPC codes and related topics.
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</BLOCKQUOTE>
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<H2> <A NAME="copyright">Copyright and Lack of Warranty</A> </H2>
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<P> Except as otherwise specified, all of this software and
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documentation is copyright © 1995-2012 by Radford M. Neal.
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<P>Permission is granted for anyone to copy, use, modify, and distribute
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these programs and accompanying documents for any purpose, provided
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this copyright notice is retained and prominently displayed, and note
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is made of any changes made to these programs. These programs and
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documents are distributed without any warranty, express or implied.
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As the programs were written for research purposes only, they have not
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been tested to the degree that would be advisable in any important
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application. All use of these programs is entirely at the user's own
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risk.
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<P>Some routines in the module rand.c are taken from the GNU C Library,
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and are copyrighted as described there and in the file LGPL.
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</BODY></HTML>
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