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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 "magnitude_equalizer_vcc_impl.h"
namespace gr {
namespace dab {
magnitude_equalizer_vcc::sptr
magnitude_equalizer_vcc::make(unsigned int vlen, unsigned int num_symbols)
{
return gnuradio::get_initial_sptr
(new magnitude_equalizer_vcc_impl(vlen, num_symbols));
}
magnitude_equalizer_vcc_impl::magnitude_equalizer_vcc_impl(unsigned int vlen, unsigned int num_symbols)
: gr::sync_block("magnitude_equalizer_vcc",
gr::io_signature::make (1, 1, sizeof(gr_complex)*vlen),
gr::io_signature::make (1, 1, sizeof(gr_complex)*vlen)),
d_vlen(vlen), d_num_symbols(num_symbols)
{
assert(d_num_symbols>0);
d_equalizer = new float[vlen];
for (unsigned int i=0;i<vlen;i++)
d_equalizer[i] = 1;
set_history(d_num_symbols);
set_tag_propagation_policy(TPP_DONT); // We need to handle the tag propagation "manually"
// because of set_history(d_num_symbols)
d_add_item_tag_at = -1;
}
magnitude_equalizer_vcc_impl::~magnitude_equalizer_vcc_impl(void)
{
delete [] d_equalizer;
}
void magnitude_equalizer_vcc_impl::update_equalizer(const gr_complex *in)
{
for (unsigned int i=0; i<d_vlen; i++)
d_equalizer[i] = std::abs(in[i]);
if (d_num_symbols>1) {
for (unsigned int i=1; i<d_num_symbols; i++) {
in += d_vlen;
for (unsigned int j=0; j<d_vlen; j++)
d_equalizer[j] += std::abs(in[j]);
}
}
for (unsigned int i=0; i<d_vlen; i++)
d_equalizer[i] = (float)d_num_symbols/d_equalizer[i];
// for (unsigned int i=0; i<d_vlen; i++)
// printf("%e, ", d_equalizer[i]);
// printf(" <-- equalizer\n");
}
int
magnitude_equalizer_vcc_impl::work(int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
gr_complex const *in = (const gr_complex *) input_items[0];
gr_complex *out = (gr_complex *) output_items[0];
std::vector<int> tag_positions;
int next_tag_position = -1;
int next_tag_position_index = -1;
// If there were not enough samples to be produced in the previous call to work(..),
// we need to add tags in the following call:
if (d_add_item_tag_at >= 0) {
if (d_add_item_tag_at < noutput_items) {
add_item_tag(0, nitems_written(0) + d_add_item_tag_at, pmt::intern("first"), pmt::intern(""), pmt::intern("magnitude_equalizer"));
d_add_item_tag_at = -1;
}
else {
d_add_item_tag_at = d_add_item_tag_at - noutput_items;
}
}
//
// Get all stream tags with key "first", and make a vector of the positions.
std::vector<tag_t> tags;
get_tags_in_range(tags, 0, nitems_read(0), nitems_read(0) + noutput_items, pmt::mp("first"));
for(int i=0;i<tags.size();i++) {
int current;
current = tags[i].offset - nitems_read(0);
tag_positions.push_back(current);
next_tag_position_index = 0;
}
if(next_tag_position_index >= 0) {
next_tag_position = tag_positions[next_tag_position_index];
}
for(int i=0; i<noutput_items; i++){
if (next_tag_position == i) { /* there was a trigger signal d_num_symbols-1 symbols before -> update equalizer */
// Action when stream tags is found:
update_equalizer(in);
if ((i + d_num_symbols-1) < noutput_items)
add_item_tag(0, nitems_written(0) + i+d_num_symbols-1, pmt::intern("first"), pmt::intern(""), pmt::intern("magnitude_equalizer"));
else {
d_add_item_tag_at = (i + d_num_symbols -1) - noutput_items;
}
//
next_tag_position_index++;
if (next_tag_position_index == tag_positions.size()) {
next_tag_position_index = -1;
next_tag_position = -1;
}
else {
next_tag_position = tag_positions[next_tag_position_index];
}
}
for (unsigned int j=0;j<d_vlen;j++)
out[j] = in[j]*d_equalizer[j];
in += d_vlen;
out += d_vlen;
}
return noutput_items;
}
}
}
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