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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><!-- saved from url=(0041)http://people.qualcomm.com/karn/code/fec/ --><HTML><HEAD><TITLE>Forward Error Correcting Codes</TITLE><META content="text/html; charset=iso-8859-1" http-equiv=Content-Type><META content="MSHTML 5.00.2920.0" name=GENERATOR></HEAD><BODY><H1>Forward Error Correcting Codes</H1>I've written software to implement various error correcting codes, including the <A href="http://drake.ee.washington.edu/~adina/rsc/slide/slide.html">Reed-Solomon block codes</A> and the Viterbi and Fano algorithms for decoding convolutional error correcting codes. They're available under the GNU Public License. <H3>General-purpose Reed-Solomon encoder/decoder in C</H3>version 2.0 (7 May 1999) now includes support for CCSDS standard (255,223) code <UL> <LI><A href="http://people.qualcomm.com/karn/code/fec/rs-readme">readme file</A> <LI><A href="http://people.qualcomm.com/karn/code/fec/rs-2.0.tar.gz">source, gzipped tar</A> </LI></UL><H3>Optimized Reed-Solomon encoder/decoder with x86asm assist for (255,223) code on Intel CPUs</H3>(no CCSDS support) <UL> <LI><A href="http://people.qualcomm.com/karn/code/fec/rs32readme.txt">readme file</A> <LI><A href="http://people.qualcomm.com/karn/code/fec/rs32.tar.gz">source, gzipped tar</A> </LI></UL><H3>C++ class library for galois field arithmetic and algebra, with RS encoder/decoder</H3>This is a class library for doing finite field arithmetic and algebra over GF(256). Two classes are defined: <B>galois</B> and <B>polynomial</B>, implementing galois field elements and polynomials over galois field elements, respectively. A (255,223) Reed-Solomon encoder and decoder functionally equivalent (but much slower than) my C version is included to demonstrate the use of the library. Because of its slow speed, the C++ version is primarily intended for educational use. (This version doesn't do the CCSDS standard). <UL> <LI><A href="http://people.qualcomm.com/karn/code/fec/galois.tar.gz">source, gzipped</A> </LI></UL><H3>Convolutional (Viterbi) decoder</H3>Version 3.0.1 (6 Aug 1999) includes support for user-specified encoder starting and terminating states, useful for "state pinning" in iterative decoding applications <IMG src="Forward Error Correcting Codes.files/news.gif"> <UL> <LI><A href="http://people.qualcomm.com/karn/code/fec/viterbi-readme">readme file</A> <LI><A href="http://people.qualcomm.com/karn/code/fec/viterbi-3.0.1.tar.gz">source, gzipped tar archive</A> </LI></UL><H3>Convolutional (Fano) decoder, version 1.1</H3><UL> <LI><A href="http://people.qualcomm.com/karn/code/fec/fano1.1.txt">readme file</A> <LI><A href="http://people.qualcomm.com/karn/code/fec/fano1.1.zip">source, zip format</A> <LI><A href="http://people.qualcomm.com/karn/code/fec/fano1.1.tar.gz">source, gzipped tar archive</A> </LI></UL><I>Last modified: 6 Aug 1999</I> </BODY></HTML>⌨️ 快捷键说明
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