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<HTML><HEAD><TITLE> Examples of LDPC Program Usage </TITLE></HEAD><BODY><H1> Examples of LDPC Program Usage </H1><P>Below, are some command files containing examples of the use ofthe <A HREF="progs.html">LDPC programs</A>, together with the output Iobtained for these examples. Output on other machines mightconceivably be slightly different, due to different round-off errors.The <A HREF="run-examples"><TT>run-examples</TT></A> script runs all the examplescripts and compares their output with the outputs that I obtained (ona Pentium machine).<P><A HREF="ex-ham7b">ex-ham7b</A>, output in <A HREF="ex-ham7b-out">ex-ham7b-out</A><BLOCKQUOTE> A (7,4) Hamming code used with a BSC.Demonstrates encoding of random messages and decoding to minimizebit error rate by exhaustive enumeration.</BLOCKQUOTE><P><A HREF="ex-ham7a">ex-ham7a</A>,output in <A HREF="ex-ham7a-out">ex-ham7a-out</A><BLOCKQUOTE> A (7,4) Hamming code used with an AWGN channel. Tested using zero messages.Decoded by exhaustive enumeration to minimize either block or bit error rate,and by probability propagation.</BLOCKQUOTE><P><A HREF="ex-dep">ex-dep</A>,output in <A HREF="ex-dep-out">ex-dep-out</A><BLOCKQUOTE> Examples of how parity check matrices with linearly dependent rows (ie,redundant parity checks) are handled. This is probably not of great interest to most users.</BLOCKQUOTE><P><A HREF="ex-ldpc-encode">ex-ldpc-encode</A>,output in <A HREF="ex-ldpc-encode-out">ex-ldpc-encode-out</A><BLOCKQUOTE> Encodes messages with an LDPC code using sparse, dense, and mixed representations of the generator matrix.</BLOCKQUOTE><P><A HREF="ex-ldpc36-1000a">ex-ldpc36-1000a</A>,output in <A HREF="ex-ldpc36-1000a-out">ex-ldpc36-1000a-out</A><BLOCKQUOTE> A (2000,1000) LDPC code with 3 checks per bit and 6 bits per check. Three encoding methods are tried out, and the code istested on an AWGN channel at various noise levels, using random messages.</BLOCKQUOTE><P><A HREF="ex-ldpc36-5000a">ex-ldpc36-5000a</A>,output in <A HREF="ex-ldpc36-5000a-out">ex-ldpc36-5000a-out</A><BLOCKQUOTE> A (10000,5000) LDPC code with 3 checks per bit and 6 bits per check. Tested on an AWGN channel at various noise levels, using random messages.Pipes are used to avoid creating lots of files.</BLOCKQUOTE><P><A HREF="ex-ldpcvar-5000a">ex-ldpcvar-5000a</A>,output in <A HREF="ex-ldpcvar-5000a-out">ex-ldpcvar-5000a-out</A><BLOCKQUOTE> A (10000,5000) LDPC code with the number of checks per bit varying from 2 to 7.Tested on an AWGN channel at various noise levels, using random messages.Pipes are used to avoid creating lots of files. Performance is better thanfor the code above in which the number of checks is the same for all bits.</BLOCKQUOTE><P><A HREF="ex-wrong-model">ex-wrong-model</A>,output in <A HREF="ex-wrong-model-out">ex-wrong-model-out</A><BLOCKQUOTE> Tests what happens when messages are decoded using the wrong noisemodel, including using the right type of model but with the wrongnoise level, and using the wrong type of model (ie, using an AWLN modelfor messages transmitted through an AWGN channel, or vice versa).</BLOCKQUOTE><HR><A HREF="index.html">Back to index for LDPC software</A></BODY></HTML>?? 快捷鍵說(shuō)明
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