Thomas Kolb
85ce667d7b
This adds 4 pilot symbols each after 128 and 256 data symbols. These are used for precision frequency estimation and feed-forward correction, resulting in less decoder errors at the end of the packet. Due to this change, this system can no longer transmit packets shorter than 64 bytes!
54 lines
1.7 KiB
C++
54 lines
1.7 KiB
C++
/* -*- c++ -*- */
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/*
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* Copyright 2019 Thomas Kolb.
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3, or (at your option)
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* any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef INCLUDED_HAMNET70_INSERT_PILOT_SYMBOLS_IMPL_H
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#define INCLUDED_HAMNET70_INSERT_PILOT_SYMBOLS_IMPL_H
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#include <hamnet70/insert_pilot_symbols.h>
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namespace gr {
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namespace hamnet70 {
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class insert_pilot_symbols_impl : public insert_pilot_symbols
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{
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private:
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std::vector<size_t> d_offsets;
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std::vector<gr_complex> d_pilot_sequence;
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protected:
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int calculate_output_stream_length(const gr_vector_int &ninput_items);
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public:
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insert_pilot_symbols_impl(const std::vector<gr_complex> &pilot_sequence, const std::vector<size_t> &offsets, const std::string &length_tag);
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~insert_pilot_symbols_impl();
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// Where all the action really happens
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int work(int noutput_items,
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gr_vector_int &ninput_items,
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gr_vector_const_void_star &input_items,
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gr_vector_void_star &output_items);
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};
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} // namespace hamnet70
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} // namespace gr
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#endif /* INCLUDED_HAMNET70_INSERT_PILOT_SYMBOLS_IMPL_H */
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