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/* -*- c++ -*- */
/* Copyright 2012 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gr_io_signature.h>
#include "ofdm_frame_equalizer_vcvc_impl.h"
namespace gr {
namespace digital {
ofdm_frame_equalizer_vcvc::sptr
ofdm_frame_equalizer_vcvc::make(
digital_ofdm_equalizer_base_sptr equalizer,
const std::string &len_tag_key,
bool propagate_channel_state,
int fixed_frame_len
)
{
return gnuradio::get_initial_sptr (
new ofdm_frame_equalizer_vcvc_impl(
equalizer, len_tag_key, propagate_channel_state, fixed_frame_len
)
);
}
ofdm_frame_equalizer_vcvc_impl::ofdm_frame_equalizer_vcvc_impl(
digital_ofdm_equalizer_base_sptr equalizer,
const std::string &len_tag_key,
bool propagate_channel_state,
int fixed_frame_len
) : gr_tagged_stream_block("ofdm_frame_equalizer_vcvc",
gr_make_io_signature(1, 1, sizeof (gr_complex) * equalizer->fft_len()),
gr_make_io_signature(1, 1, sizeof (gr_complex) * equalizer->fft_len()),
len_tag_key),
d_fft_len(equalizer->fft_len()),
d_eq(equalizer),
d_propagate_channel_state(propagate_channel_state),
d_fixed_frame_len(len_tag_key.empty() ? fixed_frame_len : 0),
d_channel_state(equalizer->fft_len(), gr_complex(1, 0))
{
if (d_fixed_frame_len) {
set_output_multiple(d_fixed_frame_len);
}
}
ofdm_frame_equalizer_vcvc_impl::~ofdm_frame_equalizer_vcvc_impl()
{
}
int
ofdm_frame_equalizer_vcvc_impl::work(int noutput_items,
gr_vector_int &ninput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
const gr_complex *in = (const gr_complex *) input_items[0];
gr_complex *out = (gr_complex *) output_items[0];
int carrier_offset = 0;
int frame_len = 0;
if (d_fixed_frame_len) {
frame_len = d_fixed_frame_len;
} else {
frame_len = ninput_items[0];
}
std::vector<gr_tag_t> tags;
get_tags_in_range(tags, 0, nitems_read(0), nitems_read(0)+1);
for (unsigned i = 0; i < tags.size(); i++) {
if (pmt::pmt_symbol_to_string(tags[i].key) == "ofdm_sync_chan_taps") {
d_channel_state = pmt::pmt_c32vector_elements(tags[i].value);
remove_item_tag(0, tags[i]);
}
}
memcpy((void *) out, (void *) in, sizeof(gr_complex) * d_fft_len * frame_len);
d_eq->reset();
d_eq->set_carrier_offset(carrier_offset);
d_eq->equalize(out, frame_len, d_channel_state);
d_eq->get_channel_state(d_channel_state);
if (d_propagate_channel_state) {
add_item_tag(0, nitems_written(0),
pmt::pmt_string_to_symbol("ofdm_sync_chan_taps"),
pmt::pmt_init_c32vector(d_fft_len, d_channel_state));
}
if (d_fixed_frame_len) {
consume_each(frame_len);
}
return frame_len;
}
} /* namespace digital */
} /* namespace gr */
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