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!
57 lines
1.8 KiB
C++
57 lines
1.8 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_H
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#define INCLUDED_HAMNET70_INSERT_PILOT_SYMBOLS_H
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#include <hamnet70/api.h>
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#include <gnuradio/tagged_stream_block.h>
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namespace gr {
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namespace hamnet70 {
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/*!
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* \brief <+description of block+>
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* \ingroup hamnet70
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*
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*/
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class HAMNET70_API insert_pilot_symbols : virtual public gr::tagged_stream_block
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{
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public:
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typedef boost::shared_ptr<insert_pilot_symbols> sptr;
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/*!
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* \brief Return a shared_ptr to a new instance of hamnet70::insert_pilot_symbols.
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*
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* To avoid accidental use of raw pointers, hamnet70::insert_pilot_symbols's
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* constructor is in a private implementation
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* class. hamnet70::insert_pilot_symbols::make is the public interface for
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* creating new instances.
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*/
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static sptr make(const std::vector<gr_complex> &pilot_sequence, const std::vector<size_t> &offsets, const std::string &length_tag);
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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_H */
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