chcoding.h

这是一个c＋＋编写的WCDMA链路采用RAKE接收的方针源代码

/*
 |
 | Copyright disclaimer:
 |   This software was developed at the National Institute of Standards
 |   and Technology by employees of the Federal Government in the course
 |   of their official duties. Pursuant to title 17 Section 105 of the
 |   United States Code this software is not subject to copyright
 |   protection and is in the public domain.
 |
 |   We would appreciate acknowledgement if the software is used.
 |
*/

/*
 | Project:     WCDMA simulation environment
 | Module:      Channel coding combinary block.
 | Author:      Tommi Makelainen, Nokia/NIST
 | Date:        February 11, 1999
 |
 | History:
 |              February 11, 1999 Tommi Makelainen
 |                      Initial version.
 |		March 18, 1999 Tommi Makelainen
 |                      Added possibility to use more than one encoder
 |                      at the same time.
 |              May 23, 1999 Tommi Makelainen
 |                      Extracted interleaver.
 |                      Added possibility to have many types
 |                      of channel coding methods (conv. or Turbo).
 |
 */

#include <stdio.h>
#include <math.h>
#include "conversions.h"
#include "bitroutines.h"
#include "config_wcdma.h"
#include "mealy.h"
#include "metrics.h"
#include "convenc.h"
#include "interleaver.h"


/*
 * generator polynomials for 3GPP FDD mode convolutional coder
 *   gen_poly_1 = 0x16f;  557 octal
 *   gen_poly_2 = 0x1b3;  663 octal
 *   gen_poly_3 = 0x1c9;  711 octal
 */

/* -------------------------------------------------------------------- */
/*
 * Function:    wcdma_convcoding_init
 * Desc.:       Convolutional coding and interleaving initialization
 *
 * Note:
 *              Generator polynomials are given as bit masks,
 *              i.e. 0x5 = 101 in binary = x^2 + 1 in polynomial form.
 */
int wcdma_convcoding_init(int coding_ratio, /* IN: 2 = 1/2, 3 = 1/3 */
                          int metric_type,  /* IN: 0=hard, 1=soft */
                          int gen_poly_1,   /* IN: 1st generator polynomial */
                          int gen_poly_2,   /* IN: 2nd generator polynomial */
                          int gen_poly_3,   /* IN: 3rd generator polynomial */
                          int input_size);  /* IN: size of input vector */

/* -------------------------------------------------------------------- */

/*
 * Function:    wcdma_chcoding_init
 * Desc.:       Channel coding initialization
 *
 * Note:
 *              The input parameters must fulfill the equation:
 *                  nInputs = 3 * rows * cols
 * 		Tail vector is 8 bits long.
 */
int wcdma_chcoding_init(int coder_type,   /* IN: 1=conv., 2=turbo */
                       int metric_type,   /* IN: 0=hard, 1=soft */
                       int coding_ratio,  /* IN: 2 = 1/2 or 3 = 1/3 */
                       int gen_polys[],   /* IN: generator polynomials */
                       int input_size);   /* IN: size of input vector */

/* -------------------------------------------------------------------- */

/*
 * Function:    wcdma_chcoding_enc
 * Desc.:       Convolutional coding and interleaving block
 *
 * Note:
 * 		Tail vector is 8 bits long.
 */
int wcdma_chcoding_enc(int coder_type,    /* IN: 1=conv., 2=turbo */
                       int coding_ratio,  /* IN: 2 = 1/2 or 3 = 1/3 */
                       int inputs[],	  /* IN: input bit vector */
                       int nInputs,	  /* IN: input vector size */
                       int outputs[],	  /* OUT: output bit vector */
                       int tail[],	  /* OUT: tail bits */
                       int instance);     /* IN: instance number */

/* -------------------------------------------------------------------- */

/*
 * Function:    wcdma_chcoding_free
 * Desc.:       Convolutional coding and interleaving clear function.
 *
 * Note:
 */
int wcdma_chcoding_free(int instance);

/* -------------------------------------------------------------------- */