bart_pdgm_model.cpp

《无线通信系统仿真——c++使用模型》这本书的源代码

//
//  File = bart_pdgm.cpp
//

#include <stdlib.h>
#include "parmfile.h"
#include "model_graph.h"
#include "bart_pdgm.h"
//#include "trianglr.h"
//#include "hamming.h"
//#include "hann.h"
#include "fft_T.h"
#include "dump_spect.h"

#ifdef _DEBUG
  extern ofstream *DebugFile;
#endif
#define _NO_ZERO_ENDS 0
#define _ZERO_ENDS 1

extern ParmFile *ParmInput;
extern int PassNumber;

//======================================================

template <class T>
BartlettPeriodogram<T>::
         BartlettPeriodogram( char* instance_name,
                              PracSimModel* outer_model,
                              Signal<T>* in_sig )
                      :PracSimModel(   instance_name,
                                       outer_model )
{
   MODEL_NAME(BartlettPeriodogram);
   OPEN_PARM_BLOCK;
   GET_INT_PARM(Seg_Len);
   GET_INT_PARM(Fft_Len);
   GET_INT_PARM(Hold_Off);
   GET_INT_PARM(Num_Segs_To_Avg);

   Psd_File_Name = new char[64];
   strcpy(Psd_File_Name, "\0");
   GET_STRING_PARM(Psd_File_Name);
   GET_DOUBLE_PARM(Freq_Norm_Factor);
   GET_BOOL_PARM(Output_In_Decibels);
   GET_BOOL_PARM(Plot_Two_Sided);
   GET_BOOL_PARM(Halt_When_Completed);

   In_Sig = in_sig;
   MAKE_INPUT(In_Sig);

   Time_Seg = new T[Seg_Len];
   Sample_Spectrum = new double[Fft_Len];
   Freq_Seg = new std::complex<double>[Fft_Len];

   for(int is=0; is<Fft_Len; is++) {
      Sample_Spectrum[is] = 0.0;
   }

   Psd_File = new ofstream(Psd_File_Name, ios::out);
   Processing_Completed = false;
}
//======================================================
template <class T>
BartlettPeriodogram<T>::~BartlettPeriodogram( void ){ };
//======================================================
template <class T>
void BartlettPeriodogram<T>::Initialize(void)
{
   Segs_In_Est = 0;
   Samps_Needed = Seg_Len;
   Block_Size = In_Sig->GetBlockSize();
   Samp_Intvl = In_Sig->GetSampIntvl();
   Delta_F = 1.0/(Samp_Intvl*Fft_Len);

};
//======================================================
template <class T>
int BartlettPeriodogram<T>::Execute()
{
   int i,is;
#ifdef _DEBUG
   *DebugFile << "In SampleSpectrum::Execute\0" << endl;
#endif

   if(Processing_Completed) return(_MES_AOK);
   if(PassNumber < Hold_Off) return (_MES_AOK);
   //--------------------------------
   //  Get pointers for buffers

   Block_Size = In_Sig->GetValidBlockSize();
   T *in_sig_ptr = GET_INPUT_PTR(In_Sig);

   int samps_avail = Block_Size;

   while(Samps_Needed <= samps_avail)
   {
      //  The new input block has enough samples to 
      //  finish a segment.
      //
      //  Fill up FFT buffer by getting Samps_Needed
      //  input samples.
      for(is=Samps_Needed; is>0; is--){
         Time_Seg[Seg_Len - is] = *in_sig_ptr++;
      }
      samps_avail -= Samps_Needed;

      //  Perform FFT
      FFT<double>(   
         Time_Seg,
         Freq_Seg,
         Seg_Len,
         Fft_Len);

      for(i=0; i<Seg_Len; i++){
         Sample_Spectrum[i] += Samp_Intvl * 
            std::norm(Freq_Seg[i])/Seg_Len;
      }

      for(is=0; is<Seg_Len; is++){
         Time_Seg[is] = 0.0;
      }
      Samps_Needed = Seg_Len;
      Segs_In_Est++;

      // is it time to dump the results?
      if(Segs_In_Est == Num_Segs_To_Avg){
         for(i=0; i<Seg_Len; i++){
            Sample_Spectrum[i] /= 
               double(Num_Segs_To_Avg);
         }
         DumpSpectrum(  
            Sample_Spectrum,
            Fft_Len,
            Delta_F,
            Freq_Norm_Factor,
            Output_In_Decibels,
            Plot_Two_Sided,
            Psd_File);

         Processing_Completed = true;
         Psd_File->close();
         if(Halt_When_Completed){
#ifdef _DEBUG
            *DebugFile << "Execution halted by " 
               << GetModelName() << endl;
#endif
            exit(0);
         }
      }
   }// end of while

   //---------------------------------------------------
   //  The number of avail new samples is not sufficient
   //  to finish a segment.  Copy the avaialble samples
   //  and then wait for the next pass to get some more.

   for(is=0; is<samps_avail; is++){
      Time_Seg[Seg_Len - Samps_Needed + is] = 
                                       *in_sig_ptr++;
   }
   Samps_Needed -= samps_avail;
   return(_MES_AOK);

}
template BartlettPeriodogram< std::complex<float> >;
template BartlettPeriodogram<float>;