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Diffstat (limited to 'gr-digital/include/digital_ofdm_cyclic_prefixer.h')
| -rw-r--r-- | gr-digital/include/digital_ofdm_cyclic_prefixer.h | 95 |
1 files changed, 0 insertions, 95 deletions
diff --git a/gr-digital/include/digital_ofdm_cyclic_prefixer.h b/gr-digital/include/digital_ofdm_cyclic_prefixer.h deleted file mode 100644 index 563a311fa3..0000000000 --- a/gr-digital/include/digital_ofdm_cyclic_prefixer.h +++ /dev/null @@ -1,95 +0,0 @@ -/* -*- c++ -*- */ -/* - * Copyright 2004-2006,2011 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_CYCLIC_PREFIXER_H -#define INCLUDED_DIGITAL_OFDM_CYCLIC_PREFIXER_H - -#include <digital/api.h> -#include <gr_tagged_stream_block.h> - -class digital_ofdm_cyclic_prefixer; -typedef boost::shared_ptr<digital_ofdm_cyclic_prefixer> digital_ofdm_cyclic_prefixer_sptr; - -/*! - * \param input_size FFT length (i.e. length of the OFDM symbols) - * \param output_size FFT length + cyclic prefix length (in samples) - * \param rolloff_len Length of the rolloff flank in samples - * \param len_tag_key For framed processing the key of the length tag - */ -DIGITAL_API digital_ofdm_cyclic_prefixer_sptr -digital_make_ofdm_cyclic_prefixer (size_t input_size, - size_t output_size, - int rolloff_len=0, - const std::string &len_tag_key=""); - - -/*! - * \brief Adds a cyclic prefix and performs pulse shaping on OFDM symbols. - * \ingroup ofdm_blk - * - * Input: OFDM symbols (in the time domain, i.e. after the IFFT). Optionally, - * entire frames can be processed. In this case, \p len_tag_key must be - * specified which holds the key of the tag that denotes how - * many OFDM symbols are in a frame. - * Output: A stream of (scalar) complex symbols, which include the cyclic prefix - * and the pulse shaping. - * Note: If complete frames are processed, and \p rolloff_len is greater - * than zero, the final OFDM symbol is followed by the delay line of - * the pulse shaping. - * - * The pulse shape is a raised cosine in the time domain. - */ -class DIGITAL_API digital_ofdm_cyclic_prefixer : public gr_tagged_stream_block -{ - friend DIGITAL_API digital_ofdm_cyclic_prefixer_sptr - digital_make_ofdm_cyclic_prefixer (size_t input_size, size_t output_size, int rolloff_len, const std::string &len_tag_key); - - - protected: - digital_ofdm_cyclic_prefixer (size_t input_size, size_t output_size, int rolloff_len, const std::string &len_tag_key); - - //! Return the number of complex samples from the number of OFDM symbols (includes rolloff) - int calculate_output_stream_length(const gr_vector_int &ninput_items); - - public: - int work(int noutput_items, - gr_vector_int &ninput_items, - gr_vector_const_void_star &input_items, - gr_vector_void_star &output_items); - - private: - size_t d_fft_len; - //! FFT length + CP length in samples - size_t d_output_size; - //! Length of the cyclic prefix in samples - int d_cp_size; - //! Length of pulse rolloff in samples - int d_rolloff_len; - //! Buffers the up-flank (at the beginning of the cyclic prefix) - std::vector<float> d_up_flank; - //! Buffers the down-flank (which trails the symbol) - std::vector<float> d_down_flank; - std::vector<gr_complex> d_delay_line; // We do this explicitly to avoid outputting zeroes (i.e. no history!) -}; - -#endif /* INCLUDED_DIGITAL_OFDM_CYCLIC_PREFIXER_H */ - |