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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_base.h"
// *** Base class ****************************************************
digital_ofdm_equalizer_base::digital_ofdm_equalizer_base(int fft_len) :
d_fft_len(fft_len),
d_carr_offset(0)
{
}
digital_ofdm_equalizer_base::~digital_ofdm_equalizer_base()
{
}
// *** Sub-Base class for 1D equalizers using pilot tones *************
digital_ofdm_equalizer_1d_pilots::digital_ofdm_equalizer_1d_pilots(
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_base(fft_len),
d_occupied_carriers(fft_len, false),
d_pilot_carriers(pilot_carriers.size(), std::vector<bool>(fft_len, false)),
d_pilot_symbols(pilot_symbols.size(), std::vector<gr_complex>(fft_len, gr_complex(0, 0))),
d_symbols_skipped(symbols_skipped),
d_pilot_carr_set(symbols_skipped),
d_channel_state(fft_len, gr_complex(1, 0))
{
int fft_shift_width = 0;
if (input_is_shifted) {
fft_shift_width = fft_len/2;
}
if (!occupied_carriers.size()) {
std::fill(d_occupied_carriers.begin(), d_occupied_carriers.end(), true);
} else {
for (unsigned i = 0; i < occupied_carriers.size(); i++) {
for (unsigned k = 0; k < occupied_carriers[i].size(); k++) {
int carr_index = occupied_carriers[i][k];
if (occupied_carriers[i][k] < 0) {
carr_index += fft_len;
}
if (carr_index >= fft_len || carr_index < 0) {
throw std::invalid_argument("data carrier index out of bounds.");
}
d_occupied_carriers[(carr_index + fft_shift_width) % fft_len] = true;
}
}
}
if (pilot_carriers.size()) {
for (unsigned i = 0; i < pilot_carriers.size(); i++) {
if (pilot_carriers[i].size() != pilot_symbols[i].size()) {
throw std::invalid_argument("pilot carriers and -symbols do not match.");
}
for (unsigned k = 0; k < pilot_carriers[i].size(); k++) {
int carr_index = pilot_carriers[i][k];
if (pilot_carriers[i][k] < 0) {
carr_index += fft_len;
}
if (carr_index >= fft_len || carr_index < 0) {
throw std::invalid_argument("pilot carrier index out of bounds.");
}
d_pilot_carriers[i][(carr_index + fft_shift_width) % fft_len] = true;
d_pilot_symbols[i][(carr_index + fft_shift_width) % fft_len] = pilot_symbols[i][k];
}
}
}
}
digital_ofdm_equalizer_1d_pilots::~digital_ofdm_equalizer_1d_pilots()
{
}
void
digital_ofdm_equalizer_1d_pilots::reset()
{
std::fill(d_channel_state.begin(), d_channel_state.end(), gr_complex(1, 0));
d_pilot_carr_set = d_symbols_skipped;
}
void digital_ofdm_equalizer_1d_pilots::get_channel_state(std::vector<gr_complex> &taps)
{
taps = d_channel_state;
}
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