GNU Radio 3.6.1 C++ API
digital_ofdm_insert_preamble.h
Go to the documentation of this file.
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/* -*- c++ -*- */
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/*
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* Copyright 2007,2011 Free Software Foundation, Inc.
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*
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* This file is part of GNU Radio
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*
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* GNU Radio 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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* GNU Radio 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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef INCLUDED_DIGITAL_OFDM_INSERT_PREAMBLE_H
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#define INCLUDED_DIGITAL_OFDM_INSERT_PREAMBLE_H
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#include <
digital_api.h
>
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#include <
gr_block.h
>
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#include <vector>
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class
digital_ofdm_insert_preamble
;
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typedef
boost::shared_ptr<digital_ofdm_insert_preamble>
digital_ofdm_insert_preamble_sptr
;
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DIGITAL_API
digital_ofdm_insert_preamble_sptr
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digital_make_ofdm_insert_preamble
(
int
fft_length,
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const
std::vector<std::vector<gr_complex> > &preamble);
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/*!
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* \brief insert "pre-modulated" preamble symbols before each payload.
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* \ingroup sync_blk
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* \ingroup ofdm_blk
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*
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* <pre>
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* input 1: stream of vectors of gr_complex [fft_length]
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* These are the modulated symbols of the payload.
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*
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* input 2: stream of char. The LSB indicates whether the corresponding
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* symbol on input 1 is the first symbol of the payload or not.
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* It's a 1 if the corresponding symbol is the first symbol,
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* otherwise 0.
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*
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* N.B., this implies that there must be at least 1 symbol in the payload.
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*
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*
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* output 1: stream of vectors of gr_complex [fft_length]
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* These include the preamble symbols and the payload symbols.
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*
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* output 2: stream of char. The LSB indicates whether the corresponding
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* symbol on input 1 is the first symbol of a packet (i.e., the
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* first symbol of the preamble.) It's a 1 if the corresponding
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* symbol is the first symbol, otherwise 0.
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* </pre>
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*
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* \param fft_length length of each symbol in samples.
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* \param preamble vector of symbols that represent the pre-modulated preamble.
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*/
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class
DIGITAL_API
digital_ofdm_insert_preamble
:
public
gr_block
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{
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friend
DIGITAL_API
digital_ofdm_insert_preamble_sptr
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digital_make_ofdm_insert_preamble
(
int
fft_length,
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const
std::vector<std::vector<gr_complex> > &preamble);
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protected
:
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digital_ofdm_insert_preamble
(
int
fft_length,
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const
std::vector<std::vector<gr_complex> > &preamble);
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private
:
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enum
state_t {
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ST_IDLE,
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ST_PREAMBLE,
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ST_FIRST_PAYLOAD,
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ST_PAYLOAD
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};
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int
d_fft_length;
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const
std::vector<std::vector<gr_complex> > d_preamble;
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state_t d_state;
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int
d_nsymbols_output;
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int
d_pending_flag;
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void
enter_idle();
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void
enter_first_payload();
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void
enter_payload();
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public
:
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~
digital_ofdm_insert_preamble
();
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void
enter_preamble();
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int
general_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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void
forecast
(
int
noutput_items,
gr_vector_int
&ninput_items_required);
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};
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#endif
/* INCLUDED_DIGITAL_OFDM_INSERT_PREAMBLE_H */
gr-digital
include
digital_ofdm_insert_preamble.h
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