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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 "digital_ofdm_equalizer_static.h"
#include <iostream>
digital_ofdm_equalizer_static_sptr
digital_make_ofdm_equalizer_static(
int fft_len,
const std::vector<std::vector<int> > &occupied_carriers,
const std::vector<std::vector<int> > &pilot_carriers,
const std::vector<std::vector<gr_complex> > &pilot_symbols,
int symbols_skipped,
bool input_is_shifted)
{
return digital_ofdm_equalizer_static_sptr(new digital_ofdm_equalizer_static(
fft_len,
occupied_carriers,
pilot_carriers,
pilot_symbols,
symbols_skipped,
input_is_shifted));
}
digital_ofdm_equalizer_static::digital_ofdm_equalizer_static(
int fft_len,
const std::vector<std::vector<int> > &occupied_carriers,
const std::vector<std::vector<int> > &pilot_carriers,
const std::vector<std::vector<gr_complex> > &pilot_symbols,
int symbols_skipped,
bool input_is_shifted)
: digital_ofdm_equalizer_1d_pilots(fft_len, occupied_carriers, pilot_carriers, pilot_symbols, symbols_skipped, input_is_shifted)
{
}
digital_ofdm_equalizer_static::~digital_ofdm_equalizer_static()
{
}
void
digital_ofdm_equalizer_static::equalize(gr_complex *frame,
int n_sym,
const std::vector<gr_complex> &initial_taps,
const std::vector<gr_tag_t> &tags)
{
d_channel_state = initial_taps;
for (int i = 0; i < n_sym; i++) {
for (int k = 0; k < d_fft_len; k++) {
if (!d_occupied_carriers[k]) {
continue;
}
if (d_pilot_carriers.size() && d_pilot_carriers[d_pilot_carr_set][k-d_carr_offset]) {
d_channel_state[k] = frame[i*d_fft_len + k] / d_pilot_symbols[d_pilot_carr_set][k-d_carr_offset];
frame[i*d_fft_len+k] = d_pilot_symbols[d_pilot_carr_set][k-d_carr_offset];
} else {
frame[i*d_fft_len+k] /= d_channel_state[k];
}
}
if (!d_pilot_carriers.empty()) {
d_pilot_carr_set = (d_pilot_carr_set + 1) % d_pilot_carriers.size();
}
}
}
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