rcode.h

用于LDPC编码译码的仿真实现。包括随机生成校验矩阵、由校验矩阵产生生成矩阵、编码、加随机噪声、译码等内容。原作者是老外

/* RCODE.H - Parity chk and gen matrix storage, and procedures to read them.*/
//校验矩阵和生成矩阵的存储，以及读取它们的程序
/* Copyright (c) 2000 by Radford M. Neal 
 *
 * Permission is granted for anyone to copy, use, or modify this program 
 * for purposes of research or education, provided this copyright notice 
 * is retained, and note is made of any changes that have been made. 
 *
 * This program is distributed without any warranty, express or implied.
 * As this program was written for research purposes only, it has not been
 * tested to the degree that would be advisable in any important application.
 * All use of this program is entirely at the user's own risk.
 */

#ifndef RCODE_H
#define RCODE_H

#include "mod2sparse.h"
/* VARIABLES HOLDING DATA READ.  These are declared for real in rcode.c. */

extern mod2sparse *H;	/* Parity check matrix */

extern int M;		/* Number of rows in parity check matrix */
extern int N;		/* Number of columns in parity check matrix */
extern int block_num;

extern char type;	/* Type of generator matrix representation */ //生成矩阵的表示方法
extern int *cols;	/* Ordering of columns in generator matrix */  //生成矩阵中列的顺序

extern mod2sparse *L, *U; /* Sparse LU decomposition, if type=='s' */
extern int *rows;	  /* Ordering of rows in generator matrix (type 's') */

//extern mod2dense *G;	/* Dense or mixed representation of generator matrix,
			  /* if type=='d' or type=='m' */


/* PROCEDURES FOR READING DATA. */

void read_pchk (char *);
void read_gen  (char *, int, int);

#endif