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/* -*- c++ -*- */
/*
* Copyright 2013-2014 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* GNU Radio is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "ber_tools.h"
inline int
putbit(int word, int loc, int bit)
{
return (((word)&(~((1)<<(loc))))^((bit)<<(loc)));
}
void
gaussnoise(float *inbuffer, int buffsize, float sigma)
{
int i;
float udrn1=0.0, udrn2=0.0, noise=0.0;
for(i = 0; i < buffsize;i++) {
while((udrn1 = (float)drand48()) < 0.0000001);
udrn2 = (float)drand48();
noise = sigma*sqrt(-2*log(udrn1))*cos(2*M_PI*udrn2);
inbuffer[i] += noise;
}
}
int
compber(unsigned char *inbuffer1, unsigned char *inbuffer2, int buffsize)
{
int i, totaldiff=0;
int popcnt[256] =
{
0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4,
1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8
};
for(i = 0; i < buffsize; i++) {
totaldiff += popcnt[inbuffer1[i]^inbuffer2[i]];
}
return totaldiff;
}
void randbuffer(unsigned char *databuffer,int buffsize, int charout)
{
int i;
unsigned char randbit;
for(i = 0; i < buffsize; i++) {
// generate random element
randbit = (unsigned char)((0x000010000&rand())>>16);
// place in the data buffer
if(charout == 0)
databuffer[i>>3] = putbit(databuffer[i>>3],7-(i&0x7),randbit);
else
databuffer[i] = randbit;
}
}
void
char2bin(unsigned char *inbuffer,int buffSize)
{
int i;
unsigned char fbit=0;
for(i = 0; i < buffSize; i++) {
if(inbuffer[i] == 0)
fbit = 0;
else
fbit = 1;
inbuffer[i>>3] = putbit(inbuffer[i>>3],7-(i&0x7),fbit);
}
}
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