discmod.c

来自「matlab实现wcdma的全过程」· C语言 代码 · 共 105 行

/*
 |
 | 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:      Discrete CDMA downlink modulation containing QPSK data 
 |		and spreading modulation.
 | Author:      Tommi Makelainen, Nokia/NIST
 | Date:        February 22, 1999
 |
 | History:
 |              February 22, 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 "spreading.h"
#include "qpsk_ints.h"
#include "discmod.h"


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

/*
 * Function:    wcdma_mod_init
 * Desc.:       Discrete data and spreading modulation initialization.
 *
 * Note:
 */
int wcdma_mod_init(void)
{

    /*
     * Allocated memory for temporary outputs.
     */

    return(0);
}

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

/*
 * Function:    wcdma_dl_mod
 * Desc.:       Data and spreading modulation
 *
 * Note:
 *		Input data length can be maximum of 2000 coded bits.
 */
int wcdma_dl_mod(int inputs[],	/* input bit vector */
                       int nInputs,	/* input vector size */
                       int code[],      /* spreading code */
                       int code_len,	/* length of spreading code */
                       int sf,		/* spreadign factor */
                       int I_out[],	/* modulated I output */
                       int Q_out[])	/* modulated Q output */
{
    int mod_data_len;
    int I_data_mod[2000], Q_data_mod[2000];
    int I_mod_antipodal[2000], Q_mod_antipodal[2000];

    wcdma_dl_qpsk_mod(inputs, nInputs, I_data_mod,
                      Q_data_mod, &mod_data_len);

    bin2antipodal(I_data_mod, nInputs/2, I_mod_antipodal);
    wcdma_spread(I_mod_antipodal, nInputs/2, code, code_len, sf, I_out);
    bin2antipodal(Q_data_mod, nInputs/2, Q_mod_antipodal);
    wcdma_spread(Q_mod_antipodal, nInputs/2, code, code_len, sf, Q_out);

    return(0);
}

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

/*
 * Function:    wcdma_dl_mod_free
 * Desc.:       Discrete modulation clean up function.
 *
 * Note:
 */
int wcdma_dl_mod_free(void)
{
    return(0);
}


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