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Diffstat (limited to 'gr-digital/include/digital_ofdm_equalizer_base.h')
| -rw-r--r-- | gr-digital/include/digital_ofdm_equalizer_base.h | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/gr-digital/include/digital_ofdm_equalizer_base.h b/gr-digital/include/digital_ofdm_equalizer_base.h new file mode 100644 index 0000000000..8665395540 --- /dev/null +++ b/gr-digital/include/digital_ofdm_equalizer_base.h @@ -0,0 +1,102 @@ +/* -*- 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 */ + |