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Diffstat (limited to 'gr-digital/include/gnuradio/digital/ofdm_frame_acquisition.h')
| -rw-r--r-- | gr-digital/include/gnuradio/digital/ofdm_frame_acquisition.h | 83 |
1 files changed, 0 insertions, 83 deletions
diff --git a/gr-digital/include/gnuradio/digital/ofdm_frame_acquisition.h b/gr-digital/include/gnuradio/digital/ofdm_frame_acquisition.h deleted file mode 100644 index 164070e8ca..0000000000 --- a/gr-digital/include/gnuradio/digital/ofdm_frame_acquisition.h +++ /dev/null @@ -1,83 +0,0 @@ -/* -*- c++ -*- */ -/* - * Copyright 2006,2007,2011,2012 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_FRAME_ACQUISITION_H -#define INCLUDED_DIGITAL_OFDM_FRAME_ACQUISITION_H - -#include <gnuradio/digital/api.h> -#include <gnuradio/block.h> -#include <vector> - -namespace gr { - namespace digital { - - /*! - * \brief take a vector of complex constellation points in from an - * FFT and performs a correlation and equalization. - * \ingroup ofdm_blk - * \ingroup deprecated_blk - * - * \details - * This block takes the output of an FFT of a received OFDM symbol - * and finds the start of a frame based on two known symbols. It - * also looks at the surrounding bins in the FFT output for the - * correlation in case there is a large frequency shift in the - * data. This block assumes that the fine frequency shift has - * already been corrected and that the samples fall in the middle - * of one FFT bin. - * - * It then uses one of those known symbols to estimate the channel - * response over all subcarriers and does a simple 1-tap - * equalization on all subcarriers. This corrects for the phase - * and amplitude distortion caused by the channel. - */ - class DIGITAL_API ofdm_frame_acquisition : virtual public block - { - public: - // gr::digital::ofdm_frame_acquisition::sptr - typedef boost::shared_ptr<ofdm_frame_acquisition> sptr; - - /*! - * Make an OFDM correlator and equalizer. - * - * \param occupied_carriers The number of subcarriers with data in the received symbol - * \param fft_length The size of the FFT vector (occupied_carriers + unused carriers) - * \param cplen The length of the cycle prefix - * \param known_symbol A vector of complex numbers representing a known symbol at the - * start of a frame (usually a BPSK PN sequence) - * \param max_fft_shift_len Set's the maximum distance you can look between bins for correlation - */ - static sptr make(unsigned int occupied_carriers, unsigned int fft_length, - unsigned int cplen, - const std::vector<gr_complex> &known_symbol, - unsigned int max_fft_shift_len=4); - - /*! - * \brief Return an estimate of the SNR of the channel - */ - virtual float snr() = 0; - }; - - } /* namespace digital */ -} /* namespace gr */ - -#endif /* INCLUDED_DIGITAL_OFDM_FRAME_ACQUISITION_H */ |