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/* -*- c++ -*- */
/*
* Copyright 2004 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.
*/
/*
* config.h is generated by configure. It contains the results
* of probing for features, options etc. It should be the first
* file included in your .cc file.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gnuradio/io_signature.h>
#include "ofdm_move_and_insert_zero_impl.h"
namespace gr {
namespace dab {
ofdm_move_and_insert_zero::sptr
ofdm_move_and_insert_zero::make(unsigned int fft_length,unsigned int num_carriers)
{
return gnuradio::get_initial_sptr
(new ofdm_move_and_insert_zero_impl(fft_length, num_carriers));
}
ofdm_move_and_insert_zero_impl::ofdm_move_and_insert_zero_impl(unsigned int fft_length,unsigned int num_carriers)
: gr::sync_block("ofdm_move_and_insert_zero",
gr::io_signature::make (1, 1, sizeof(gr_complex)*num_carriers),
gr::io_signature::make (1, 1, sizeof(gr_complex)*fft_length)),
d_fft_length(fft_length), d_num_carriers(num_carriers)
{
d_zeros_on_left = (d_fft_length-d_num_carriers)/2;
}
int
ofdm_move_and_insert_zero_impl::work(int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
int i;
unsigned int j,k;
/* partially adapted from gr_ofdm_frame_acquisition.cc */
const gr_complex *in = (const gr_complex *) input_items[0];
gr_complex *out = (gr_complex *) output_items[0];
for (i=0; i<noutput_items; i++) {
/* zeros on left */
for (j=0; j<d_zeros_on_left; j++)
out[j] = 0;
/* first half of symbols */
for (k=0; j<d_zeros_on_left+d_num_carriers/2; j++,k++)
out[j] = in[k];
/* zentral carrier (zero) */
out[j++] = 0;
/* second half of symbols */
for (; j<d_zeros_on_left+d_num_carriers+1; j++,k++)
out[j] = in[k];
/* zeros on rigth */
for (; j<d_fft_length; j++)
out[j] = 0;
in+=d_num_carriers;
out+=d_fft_length;
assert(k==d_num_carriers);
}
return noutput_items;
}
}
}
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