chdecoding.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:      De-interleaving and convolutional decoder.
 | Author:      Tommi Makelainen, Nokia/NIST
 | Date:        February 12, 1999
 |
 | History:
 |              February 12, 1999 Tommi Makelainen
 |                      Initial version.
 |
 */

#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 "convdec.h"
#include "interleaver.h"


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

/*
 * Function:    wcdma_chdecoding_init
 * Desc.:       Convolutional decoding initialization
 *
 * Note:
 */
int wcdma_chdecoding_init(
                int coder_type,         /* 1=conv., 2=turbo */
                int coding_ratio,       /* 2 = 1/2 or 3 = 1/3 */
      		int input_size,		/* Size of input bit estimate vector */
                int metric_type, 	/* 0=hard, 1=soft */
                int gen_polys[], 	/* generator polynomials */
                double soft_prob_0[],   /* probabilities for 0 value */
                double soft_prob_1[],   /* probabilities for 1 value */
		int nSoftProbs);	/* Length of probability vectors */

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

/*
 * Function:    wcdma_chdecoding_dec
 * Desc.:       Convolutional decoding and de-interleaving block
 *
 * Note:
 *              The input parameters must fulfill the equations:
 *                  3 * nInputs = rows * cols
 *		    nInputs % 3 = 0
 *              Tail vector is 8 bits long.
 */
int wcdma_chdecoding_dec(
                         int coder_type,        /* 1=conv., 2=turbo */
                         int coding_ratio,      /* 2 = 1/2 or 3 = 1/3 */
                         int demod_inputs[],    /* input bit vector */
                         int nInputs,     	/* input vector size */
                         double soft_bits[],	/* output bit vector */
                         int decoded_bits[],	/* output bit vector */
                         int tail[],      	/* tail bits */
                         int instance);         /* tail bits */

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

/*
 * Function:    wcdma_chdecoding_free
 * Desc.:       Convolutional decoding and de-interleaving clean up.
 *
 * Note:
 */
void wcdma_chdecoding_free(int instance);

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