Initial Commit

lib/ldpc/channel.h

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+/* CHANNEL.H - Declarations regarding channels. */
+
+/* Copyright (c) 1995-2012 by Radford M. Neal.
+ *
+ * Permission is granted for anyone to copy, use, modify, and distribute
+ * these programs and accompanying documents for any purpose, provided
+ * this copyright notice is retained and prominently displayed, and note
+ * is made of any changes made to these programs.  These programs and
+ * documents are distributed without any warranty, express or implied.
+ * As the programs were written for research purposes only, they have not
+ * been tested to the degree that would be advisable in any important
+ * application.  All use of these programs is entirely at the user's own
+ * risk.
+ */
+
+
+/* TYPES OF CHANNEL, AND CHANNEL PARAMETERS.  The global variables declared
+   here are located in channel.c. */
+
+typedef enum { BSC, AWGN, AWLN } channel_type;
+
+extern channel_type channel;	/* Type of channel */
+
+extern double error_prob;	/* Error probability for BSC */
+extern double std_dev;		/* Noise standard deviation for AWGN */
+extern double lwidth;		/* Width of noise distributoin for AWLN */
+
+
+/* PROCEDURES TO DO WITH CHANNELS. */
+
+int  channel_parse (char **, int);
+void channel_usage (void);