walsh_and_pn.c

5509的代码程序

extern int walshcode_bw0[];
extern int pncode_bw0[];


void walsh_pn_bw0(int input[])
{ 
  int walsh1[16];
  int a[13];
  int i,j;
  int *walsh_p=walshcode_bw0;
  int *pn_p=pncode_bw0;
  int *p,*q=input;
  int m,n;
  
  for (i=0;i<13;i++)
  {
    a[i]=input[i*4]*8+input[i*4+1]*4+input[i*4+2]*2+input[i*4+3]*1;
  }
  

 
  for (i=0;i<13;i++)
  { 
    p=walsh_p+a[i]*16;
    for (j=0;j<16;j++)
    {
      walsh1[j]=*p++;
    } 

    for (m=0;m<4;m++)
    {
      p=walsh1;
      for (n=0;n<16;n++)
      {
        *q++=*p++;
      }
    }          
    
  }/*walsh end*/
  

  m=0;  
  q=input;
  p=pn_p;
  for (i=0;i<832;i++) 
  { 
    m=i;
    if(m!=0&&(m%256==0)) p=pn_p;
    
    *q++=(*q+(*p++))%8;
  }/*pn end*/
  
  return;
}