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/* -*- c++ -*- */
/*
* Copyright 2013, 2018 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#ifndef INCLUDED_DIGITAL_OFDM_CYCLIC_PREFIXER_IMPL_H
#define INCLUDED_DIGITAL_OFDM_CYCLIC_PREFIXER_IMPL_H
#include <gnuradio/digital/ofdm_cyclic_prefixer.h>
#include <vector>
namespace gr {
namespace digital {
class ofdm_cyclic_prefixer_impl : public ofdm_cyclic_prefixer
{
private:
//! FFT length
int d_fft_len;
//! State, that determines the current output length used.
unsigned d_state;
//! Variable being initialized with the largest CP.
int d_cp_max;
//! Variable being initialized with the smallest CP.
int d_cp_min;
//! Length of pulse rolloff in samples
int d_rolloff_len;
//! Vector, that holds different CP lengths
std::vector<int> d_cp_lengths;
//! 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;
//! Vector, that holds tail of the predecessor symbol.
std::vector<gr_complex> d_delay_line; // We do this explicitly to avoid outputting
// zeroes (i.e. no history!)
//! Holds the length tag key.
const std::string d_len_tag_key;
protected:
int calculate_output_stream_length(const gr_vector_int& ninput_items) override;
public:
ofdm_cyclic_prefixer_impl(int fft_len,
const std::vector<int>& cp_lengths,
int rolloff_len,
const std::string& len_tag_key);
~ofdm_cyclic_prefixer_impl() override;
int work(int noutput_items,
gr_vector_int& ninput_items,
gr_vector_const_void_star& input_items,
gr_vector_void_star& output_items) override;
};
} // namespace digital
} // namespace gr
#endif /* INCLUDED_DIGITAL_OFDM_CYCLIC_PREFIXER_IMPL_H */
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