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/* file: Puncture.c
Description: Puncture bits at output of encoder
The calling syntax is:
[output] = Puncture(input, pun_pattern, tail_pattern )
output = Punctured sequence
input = Code bits to be punctured
pun_pattern = Puncturing pattern for encoded data bits
tail_pattern = Puncturing pattern for encoded tail bits
Copyright (C) 2005-2008, Matthew C. Valenti
Last updated on May 22, 2008
Function Puncture is part of the Iterative Solutions
Coded Modulation Library. The Iterative Solutions Coded Modulation
Library is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 2.1 of the License,
or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <math.h>
#include <mex.h>
#include <Matrix.h>
#include <stdlib.h>
/* Input Arguments
prhs[0] is input
prhs[1] is pun_pattern
prhs[2] is tail_pattern */
/* Output Arguments
plhs[0] is output */
/* main function that interfaces with MATLAB */
void mexFunction(
int nlhs,
mxArray *plhs[],
int nrhs,
const mxArray *prhs[] )
{
double *input, *pun_pattern, *tail_pattern; /* inputs */
double *output_p; /* output */
int height; /* height of input matrices */
int length; /* number of data+tail bits */
int tail_period; /* period of the tail pattern */
int number_data_bits; /* number of data bits */
int pun_period; /* period of puncturing pattern */
int number_pun_bits; /* length after puncturing */
int number_pun_periods; /* number of puncture periods */
int partial_period; /* length of last period (if partial) */
int bits_per_period; /* number punctured bits per period */
int temp_count;
int i, j, count_total, count_period; /* counting variables */
/* Check for proper number of arguments */
if ((nrhs < 3 )||(nlhs > 1)) {
mexErrMsgTxt("Usage: [output] = Puncture(input, pun_pattern, tail_pattern )");
} else {
/* first input is the data word */
input = mxGetPr(prhs[0]);
length = mxGetN(prhs[0]);
height = mxGetM(prhs[0]);
/* second input is the punctuing pattern for coded data bits */
pun_pattern = mxGetPr(prhs[1]);
pun_period = mxGetN(prhs[1]);
if ( mxGetM(prhs[1])!=height )
mexErrMsgTxt("Number rows in pun_pattern must match the number in input");
/* third input is the puncturing pattern for coded tail bits */
tail_pattern = mxGetPr(prhs[2]);
tail_period = mxGetN(prhs[2]);
if ( ( mxGetM(prhs[2])!=height )&&( tail_period > 0 ) )
mexErrMsgTxt("Number rows in tail_pattern must match the number in input");
number_data_bits = length - tail_period;
/* determine length of punctured output */
bits_per_period = 0;
for (i=0;i<pun_period*height;i++)
bits_per_period += (int) pun_pattern[i];
number_pun_periods = floor(number_data_bits/pun_period);
number_pun_bits = number_pun_periods*bits_per_period;
/* printf( "Calculated punctured DATA bits = %d\n", number_pun_bits ); */
/* in case there is a fraction of a period at the end */
partial_period = number_data_bits%pun_period;
for (i=0;i<partial_period*height;i++)
number_pun_bits += (int) pun_pattern[i];
/* tail bits */
for (i=0;i<tail_period*height;i++) {
number_pun_bits += (int) tail_pattern[i];
}
/* set up output */
plhs[0] = mxCreateDoubleMatrix(1, number_pun_bits, mxREAL );
output_p = mxGetPr(plhs[0]);
/* printf( "Length = %d\n", length );
printf( "Height = %d\n", height );
printf( "Puncture Period = %d\n", pun_period );
printf( "Tail Period = %d\n", tail_period);
printf( "Number Puncture Periods = %d\n", number_pun_periods );
printf( "Length of Partial Period = %d\n", partial_period );
printf( "Calculated punctured bits = %d\n", number_pun_bits ); */
/* puncture the coded data bits */
count_total = 0;
count_period = 0;
for (i=0;i<number_data_bits*height;i++) {
temp_count = pun_pattern[count_period];
while( temp_count > 0 ) {
output_p[count_total] = input[i];
temp_count--;
count_total++;
}
count_period++;
if (count_period == pun_period*height)
count_period = 0;
}
/* puncture the coded tail bits
New 11/21/05: if height = 4, then
the tail bits are rearranged to conform to UMTS convention */
if ( height == 4 ) {
/* upper RSC's tail bits */
for (i=0;i<tail_period;i++) {
for (j=0;j<2;j++) {
temp_count = tail_pattern[i*4+j];
while( temp_count > 0 ) {
output_p[count_total] = input[number_data_bits*height+i*4+j];
temp_count--;
count_total++;
}
}
}
/* lower RSC's tail bits */
for (i=0;i<tail_period;i++) {
for (j=0;j<2;j++) {
temp_count = tail_pattern[i*4+j+2];
while( temp_count > 0 ) {
output_p[count_total] = input[number_data_bits*height+i*4+j+2];
temp_count--;
count_total++;
}
}
}
} else {
for (i=0;i<tail_period*height;i++) {
temp_count = tail_pattern[i];
while( temp_count > 0 ) {
output_p[count_total] = input[number_data_bits*height+i];
temp_count--;
count_total++;
}
}
}
if (count_total != number_pun_bits ) {
printf( "Calculated punctured bits = %d but actual = %d", number_pun_bits, count_total );
mexErrMsgTxt( "Error!" );
}
}
return;
}
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