gen_win.cpp

《无线通信系统仿真——c++使用模型》这本书的源代码

//
//  File = gen_win.cpp
//

#include <math.h>
//#include <stdio.h>
//#include <iomanip>
#include "gen_win.h"
#include "misdefs.h"

//======================================================
GenericWindow::GenericWindow( int length )
{
   Initialize(length);
}
//=====================================================
void GenericWindow::Initialize( int length )
{
   Length = length;
   if(length%2){ 
      Half_Length = (length+1)/2; 
   }
   else{ 
      Half_Length = length/2; 
   }
   Half_Lag_Win = new double[Half_Length];
   Data_Win = NULL;

   return;
}
//======================================================
double GenericWindow::GetDataWinCoeff( int samp_indx)
{
   int middle;

   if(Length%2){
      middle = (Length-1)/2;
      if(samp_indx < middle){ 
         return(Half_Lag_Win[middle-samp_indx]); 
      }
      else{ 
         return( Half_Lag_Win[samp_indx-middle]); 
      }
   }
   else{
      middle = Length/2;
      if(samp_indx < middle){ 
         return(Half_Lag_Win[middle-1-samp_indx]); 
      }
      else{ 
         return(Half_Lag_Win[samp_indx-middle]); 
      }
   }
}
//======================================================
void GenericWindow::NormalizeWindow( void )
{
   double peak;
   peak = Half_Lag_Win[0];
   for(int n=0; n<Half_Length; n++){
      Half_Lag_Win[n] /= peak;
   }
   return;
}  
//======================================================
double* GenericWindow::GetDataWindow( void )
{
   if( Data_Win == NULL ){
      Data_Win = new double[Length];
      for(int n=0; n<Length; n++){
         Data_Win[n] = GetDataWinCoeff(n);
      }
   }
   return(Data_Win);
}
//======================================================  
double* GenericWindow::GetHalfLagWindow( void )
{
   return(Half_Lag_Win);
}
//======================================================
int GenericWindow::GetNumTaps( void )
{
   return(Length);
}