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Diffstat (limited to 'gr-digital/include/digital_ofdm_sync_sc_cfb.h')
| -rw-r--r-- | gr-digital/include/digital_ofdm_sync_sc_cfb.h | 79 |
1 files changed, 0 insertions, 79 deletions
diff --git a/gr-digital/include/digital_ofdm_sync_sc_cfb.h b/gr-digital/include/digital_ofdm_sync_sc_cfb.h deleted file mode 100644 index cc728814ed..0000000000 --- a/gr-digital/include/digital_ofdm_sync_sc_cfb.h +++ /dev/null @@ -1,79 +0,0 @@ -/* -*- 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_SYNC_SC_CFB_H -#define INCLUDED_DIGITAL_OFDM_SYNC_SC_CFB_H - -#include <digital/api.h> -#include <gr_hier_block2.h> - -class digital_ofdm_sync_sc_cfb; -typedef boost::shared_ptr<digital_ofdm_sync_sc_cfb> digital_ofdm_sync_sc_cfb_sptr; - -/*! \param fft_len FFT length - * \param cp_len Length of the guard interval (cyclic prefix) in samples - */ -DIGITAL_API digital_ofdm_sync_sc_cfb_sptr -digital_make_ofdm_sync_sc_cfb (int fft_len, int cp_len); - -/*! - * \brief Schmidl & Cox synchronisation for OFDM - * \ingroup ofdm_blk - * \ingroup sync_blk - * - * Input: complex samples. - * Output 0: Fine frequency offset, scaled by the OFDM symbol duration. - * This is \f$\hat{\varphi}\f$ in [1]. The normalized frequency - * offset is then 2.0*output0/fft_len. - * Output 1: Beginning of the first OFDM symbol after the first (doubled) OFDM - * symbol. The beginning is marked with a 1 (it's 0 everywhere else). - * - * The evaluation of the coarse frequency offset is *not* done in this block. - * Also, the initial equalizer taps are not calculated here. - * - * Note that we use a different normalization factor in the timing metric than - * the authors do in their original work[1]. If the timing metric (8) is - * \f[ - * M(d) = \frac{|P(d)|^2}{(R(d))^2}, - * \f] - * we calculate the normalization as - * \f[ - * R(d) = \frac{1}{2} \sum_{k=0}^{N-1} |r_{k+d}|^2, - * \f] - * i.e., we estimate the energy from *both* half-symbols. This avoids spurious detects - * at the end of a burst, when the energy level suddenly drops. - * - * [1] Schmidl, T.M. and Cox, D.C., "Robust frequency and timing synchronization for OFDM", - * Communications, IEEE Transactions on, 1997. - */ -class DIGITAL_API digital_ofdm_sync_sc_cfb : public gr_hier_block2 -{ - private: - friend DIGITAL_API digital_ofdm_sync_sc_cfb_sptr digital_make_ofdm_sync_sc_cfb (int fft_len, int cp_len); - digital_ofdm_sync_sc_cfb(int fft_len, int cp_len); - - public: - ~digital_ofdm_sync_sc_cfb(); - -}; - -#endif /* INCLUDED_DIGITAL_OFDM_SYNC_SC_CFB_H */ - |