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<HTML><HEAD><TITLE> Software for Low Density Parity Check Codes </TITLE></HEAD><BODY><H1> Software for Low Density Parity Check Codes </H1><P><A HREF="http://www.cs.utoronto.ca/~radford/">Radford M. Neal</A>,Dept. of Statistics and Dept. of Computer Science, University of Toronto<P>Version of 2006-02-08.<P>This collection of programs and modules, written in C, is intendedto support research and education concerning Low Density Parity Check(LDPC) codes. (Note, however, that the copyright notice no longerrestricts use to these purposes). These codes were invented by RobertGallager in the early 1960's, and re-invented and shown to have verygood performance by David MacKay and myself in the mid-1990's. Thedecoding algorithm for LDPC codes is related to that used for Turbocodes, and to probabilistic inference methods used in other fields.Variations on LDPC and Turbo codes are currently the best practicalcodes known, in terms of their ability to transmit data at ratesapproaching channel capacity with very low error probability.<H2>Index to Documentation</H2><A HREF="install.html">Download and installation instructions</A><BLOCKQUOTE> How to get and compile the programs and modules.</BLOCKQUOTE><A HREF="release.html">Release notes</A><BLOCKQUOTE> A log of changes made in each release of this software.</BLOCKQUOTE><A HREF="progs.html">Software and program usage documentation</A><BLOCKQUOTE> General documentation on the methods implemented, and details of program usage.</BLOCKQUOTE><A HREF="examples.html">Examples of program usage</A><BLOCKQUOTE> Examples using simple Hamming codes, and using more interesting LDPC codes.</BLOCKQUOTE><A HREF="modify.html">How to modify the programs</A><BLOCKQUOTE> Notes on how to add new channel types, new decoding methods, etc.</BLOCKQUOTE><A HREF="modules.html">Module documentation</A><BLOCKQUOTE> Modules used by the programs for modulo-2 matrix operations and random number generation.</BLOCKQUOTE><A HREF="refs.html">References</A><BLOCKQUOTE> Classic and more recent papers on LDPC codes and related topics.</BLOCKQUOTE><H2> <A NAME="copyright">Copyright and Lack of Warranty</A> </H2><P> This software and documentation is copyright © 1995, 1996,2000, 2001, 2006 by Radford M. Neal.<P>Permission is granted for anyone to copy, use, modify, or distributethese programs and accompanying documents for any purpose, providedthis copyright notice is retained and prominently displayed, alongwith a note saying that the original programs are available fromRadford Neal's web page, and note is made of any changes made to theseprograms. These programs and documents are distributed without anywarranty, express or implied. As the programs were written forresearch purposes only, they have not been tested to the degree thatwould be advisable in any important application. All use of theseprograms is entirely at the user's own risk.</BODY></HTML>?? 快捷鍵說明
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