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/* -*- c++ -*- */
/*
* Copyright 2013 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_IMPL_H
#define INCLUDED_DIGITAL_OFDM_CYCLIC_PREFIXER_IMPL_H
#include <digital/ofdm_cyclic_prefixer.h>
namespace gr {
namespace digital {
class ofdm_cyclic_prefixer_impl : public ofdm_cyclic_prefixer
{
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!)
protected:
int calculate_output_stream_length(const gr_vector_int &ninput_items);
public:
ofdm_cyclic_prefixer_impl(size_t input_size, size_t output_size, int rolloff_len, const std::string &len_tag_key);
~ofdm_cyclic_prefixer_impl();
int work(int noutput_items,
gr_vector_int &ninput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items);
};
} // namespace digital
} // namespace gr
#endif /* INCLUDED_DIGITAL_OFDM_CYCLIC_PREFIXER_IMPL_H */
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