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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.
*/
#ifndef INCLUDED_DIGITAL_OFDM_EQUALIZER_BASE_H
#define INCLUDED_DIGITAL_OFDM_EQUALIZER_BASE_H
#include <digital/api.h>
#include <gr_tags.h>
#include <gr_complex.h>
#include <boost/enable_shared_from_this.hpp>
class digital_ofdm_equalizer_base;
typedef boost::shared_ptr<digital_ofdm_equalizer_base> digital_ofdm_equalizer_base_sptr;
class digital_ofdm_equalizer_1d_pilots;
typedef boost::shared_ptr<digital_ofdm_equalizer_1d_pilots> digital_ofdm_equalizer_1d_pilots_sptr;
/* \brief Base class for implementation details of frequency-domain OFDM equalizers.
* \ingroup ofdm_blk
* \ingroup eq_blk
*
*/
class DIGITAL_API digital_ofdm_equalizer_base : public boost::enable_shared_from_this<digital_ofdm_equalizer_base>
{
protected:
int d_fft_len;
int d_carr_offset;
public:
digital_ofdm_equalizer_base(int fft_len);
~digital_ofdm_equalizer_base();
virtual void reset() = 0;
void set_carrier_offset(int offset) { d_carr_offset = offset; };
virtual void equalize(
gr_complex *frame,
int n_sym,
const std::vector<gr_complex> &initial_taps = std::vector<gr_complex>(),
const std::vector<gr_tag_t> &tags = std::vector<gr_tag_t>()) = 0;
virtual void get_channel_state(std::vector<gr_complex> &taps) = 0;
int fft_len() { return d_fft_len; };
digital_ofdm_equalizer_base_sptr base() { return shared_from_this(); };
};
/* \brief Base class for implementation details of 1-dimensional OFDM FDEs which use pilot tones.
* \ingroup digital
*
*/
class DIGITAL_API digital_ofdm_equalizer_1d_pilots : public digital_ofdm_equalizer_base
{
protected:
//! If \p d_occupied_carriers[k][l] is true, symbol k, carrier l is carrying data.
// (this is a different format than occupied_carriers!)
std::vector<bool> d_occupied_carriers;
//! If \p d_pilot_carriers[k][l] is true, symbol k, carrier l is carrying data.
// (this is a different format than pilot_carriers!)
std::vector<std::vector<bool> > d_pilot_carriers;
//! If \p d_pilot_carriers[k][l] is true, d_pilot_symbols[k][l] is its tx'd value.
// (this is a different format than pilot_symbols!)
std::vector<std::vector<gr_complex> > d_pilot_symbols;
//! In case the frame doesn't begin with OFDM symbol 0, this is the index of the first symbol
int d_symbols_skipped;
//! The current position in the set of pilot symbols
int d_pilot_carr_set;
//! Vector of length d_fft_len saving the current channel state (on the occupied carriers)
std::vector<gr_complex> d_channel_state;
public:
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_1d_pilots();
void reset();
void get_channel_state(std::vector<gr_complex> &taps);
};
#endif /* INCLUDED_DIGITAL_OFDM_EQUALIZER_BASE_H */
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