/* | Project:     WCDMA simulation environment | Module:      |              This function is a simulink interface to channel  |              estimation function. Currently this only checks  |              what channel (amplitude) taps are above |              given threshold and return those |              taps and the number of relevant taps    | |  | Author:      Maarit Melvasalo | Date:        May 1999 | | History: |              May 18,  1999 Maarit Melvasalo  |       | |  Abstract: | | USER GIVEN PARAMETERS | | 1: THERS = threshold value for channel estimation | 2: nSlot = number od slot in a frame (used for sample timing) |  | Inputs: |        Channel  |        Delay |                | Outputs:  |        Channel |        Delay  |        Number of relevant channel taps  | | DEPENDS ON FILES  |          | | 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. | */ #define S_FUNCTION_NAME s_channel_estimator#define S_FUNCTION_LEVEL 2#include <math.h>#include "simstruc.h"#include "channel.h"#include "tmwtypes.h"#include "config_wcdma.h"#include "wcdma_simulink.h"/* USER GIVEN PARAMETERS AND DEFINITIONS /**/#define NPARAMS 2                               /* number of parameters /**/#define THRES(S) ssGetSFcnParam(S,0)            /* Channel threshold*/#define SLOTS(S)  ssGetSFcnParam(S,1)#define nSlots (int_T)(mxGetPr(SLOTS(S))[0]) #define A(element) (*aPtrs[element])  /* Pointer to Input Port0 */#define D(element) (*dPtrs[element])  /* Pointer to Input Port0 */        /*turha, mutta ei se mitaan */#define td  TD_FRAME / (real_T)nSlots  /*SLOT     /**//*====================* */static void mdlInitializeSizes(SimStruct *S){  ssSetNumSFcnParams(S, NPARAMS);  /* Number of expected parameters */  if (ssGetNumSFcnParams(S) != ssGetSFcnParamsCount(S))  {      return; }    ssSetNumContStates(S, 0);    ssSetNumDiscStates(S, 0);    if (!ssSetNumInputPorts(S, 2)) return;    ssSetInputPortWidth(S, 0, MAX_CHANNEL_TAPS);    ssSetInputPortWidth(S, 1, MAX_CHANNEL_TAPS);    ssSetInputPortDirectFeedThrough(S, 0, 1);    ssSetInputPortDirectFeedThrough(S, 1, 1);    if (!ssSetNumOutputPorts(S, 3)) return;    ssSetOutputPortWidth(S, 0, MAX_CHANNEL_TAPS);       ssSetOutputPortWidth(S, 1, MAX_CHANNEL_TAPS);       ssSetOutputPortWidth(S, 2, 1);    ssSetNumSampleTimes(S, 1);    ssSetSFcnParamNotTunable(S,0); /* nopeuttaa, kun vakio parametrit*/     ssSetSFcnParamNotTunable(S,1);      /* Take care when specifying exception free code - see sfuntmpl.doc */    ssSetOptions(S, SS_OPTION_EXCEPTION_FREE_CODE);}   /* ei saa kayttaa mxCalloc tai mexErrMsgTxt tms rutiineita *//* Function: mdlInitializeSampleTimes ========================================= */static void mdlInitializeSampleTimes(SimStruct *S){  ssSetSampleTime(S, 0, td);   ssSetOffsetTime(S, 0, 0.0);}/* Function: mdlOutputs ======================================================= */static void mdlOutputs(SimStruct *S, int_T tid){  real_T            *channel = ssGetOutputPortRealSignal(S,0);  real_T            *delay = ssGetOutputPortRealSignal(S,1);  real_T            *length    = ssGetOutputPortRealSignal(S,2);  InputRealPtrsType aPtrs = ssGetInputPortRealSignalPtrs(S,0);  InputRealPtrsType dPtrs = ssGetInputPortRealSignalPtrs(S,1);  int_T             i,i_tmp;              real_T             channel_threshold = mxGetPr(THRES(S))[0]  ;     i_tmp =0;  for (i = 0; i < MAX_CHANNEL_TAPS; i++){    if (A(i) > channel_threshold) {      channel[i_tmp] = A(i);      delay[i_tmp] = D(i);      i_tmp ++;    }  }  length[0] = i_tmp;}/* Function: mdlTerminate ===================================================== */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