s_hard_decission.c

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:      
 | Author:      
 | Date:        April 2, 1999
 |
 | History:
 |              April 2, 1999 Maarit Melvasalo
 |                      Initial version        
 *
 *  File    : 
 *  Abstract:
 *
 * USER GIVEN PARAMETERS
 * 
 * 0: in_dem   = Size of real input vector (= packet size) 
 * 1: nFrames  = sample time
 
 */

#define S_FUNCTION_NAME s_hard_decission
#define S_FUNCTION_LEVEL 2

#include <math.h>
#include "simstruc.h"
#include "tmwtypes.h"
#include "config_wcdma.h"

/* MAX_CHANNEL_TAPS/**/

#define NPARAMS 4


#define IN_SIZE(S)  ssGetSFcnParam(S,0)
#define in_dem (int_T)(mxGetPr(IN_SIZE(S))[0])

#define frame(S) ssGetSFcnParam(S,1)   /* /**/
#define nFrames (mxGetPr(frame(S))[0]) 

#define thres(S) ssGetSFcnParam(S,2)   /* /**/

#define out_mode(S) ssGetSFcnParam(S,3)   /* /**/


#define I(element) (*IPtrs[element])

#define td  nFrames * TD_FRAME     /* sample time/**/


static void mdlInitializeSizes(SimStruct *S)

{
  ssSetNumSFcnParams(S, NPARAMS);

  if (ssGetNumSFcnParams(S) != ssGetSFcnParamsCount(S)) 
    {
      return;
	}

    if (!ssSetNumInputPorts(S, 1)) return;
    ssSetInputPortWidth(S, 0, in_dem);
    ssSetInputPortDirectFeedThrough(S, 0, 1);

    if (!ssSetNumOutputPorts(S, 1)) return;
    ssSetOutputPortWidth(S, 0,in_dem);  

    ssSetNumSampleTimes(S, 1);

    ssSetSFcnParamNotTunable(S,0);
    ssSetSFcnParamNotTunable(S,1);
    ssSetSFcnParamNotTunable(S,2);  

    /* Take care when specifying exception free code - see sfuntmpl.doc */
    ssSetOptions(S, SS_OPTION_EXCEPTION_FREE_CODE);
    /* do not use mxCalloc or  mexErrMsgTxt functions */
} 

static void mdlInitializeSampleTimes(SimStruct *S)
{    
     ssSetSampleTime(S, 0, td); 
     ssSetOffsetTime(S, 0, 0.0);

}


static void mdlOutputs(SimStruct *S, int_T tid)
{
  real_T            *y   = ssGetOutputPortRealSignal(S,0);
  InputRealPtrsType IPtrs = ssGetInputPortRealSignalPtrs(S,0);
  real_T            mode = mxGetPr(out_mode(S))[0];
  real_T            threshold = mxGetPr(thres(S))[0];
  int_T             lp = 0;


  if( mode < 1)
    {
      for (lp = 0; lp < in_dem; lp++){
	y[lp] = (I(lp) > threshold ? 1 : 0);
      }
    }
  else{
    for (lp = 0; lp < in_dem; lp++){
      y[lp] = (I(lp) > threshold ? 1 : -1);
    }
    
  }
}


static void mdlTerminate(SimStruct *S)
{  

}

#ifdef  MATLAB_MEX_FILE    /* Is this file being compiled as a MEX-file? */
#include "simulink.c"      /* MEX-file interface mechanism */
#else
#include "cg_sfun.h"       /* Code generation registration function */
#endif