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