3 * Copyright 2007 Free Software Foundation, Inc.
5 * This file is part of GNU Radio
7 * GNU Radio is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 3, or (at your option)
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13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
22 #ifndef INCLUDED_GR_OFDM_INSERT_PREAMBLE_H
23 #define INCLUDED_GR_OFDM_INSERT_PREAMBLE_H
28 class gr_ofdm_insert_preamble;
29 typedef boost::shared_ptr<gr_ofdm_insert_preamble> gr_ofdm_insert_preamble_sptr;
31 gr_ofdm_insert_preamble_sptr
32 gr_make_ofdm_insert_preamble(int fft_length,
33 const std::vector<std::vector<gr_complex> > &preamble);
36 * \brief insert "pre-modulated" preamble symbols before each payload.
41 * input 1: stream of vectors of gr_complex [fft_length]
42 * These are the modulated symbols of the payload.
44 * input 2: stream of char. The LSB indicates whether the corresponding
45 * symbol on input 1 is the first symbol of the payload or not.
46 * It's a 1 if the corresponding symbol is the first symbol,
49 * N.B., this implies that there must be at least 1 symbol in the payload.
52 * output 1: stream of vectors of gr_complex [fft_length]
53 * These include the preamble symbols and the payload symbols.
55 * output 2: stream of char. The LSB indicates whether the corresponding
56 * symbol on input 1 is the first symbol of a packet (i.e., the
57 * first symbol of the preamble.) It's a 1 if the corresponding
58 * symbol is the first symbol, otherwise 0.
61 * \param fft_length length of each symbol in samples.
62 * \param preamble vector of symbols that represent the pre-modulated preamble.
65 class gr_ofdm_insert_preamble : public gr_block
67 friend gr_ofdm_insert_preamble_sptr
68 gr_make_ofdm_insert_preamble(int fft_length,
69 const std::vector<std::vector<gr_complex> > &preamble);
72 gr_ofdm_insert_preamble(int fft_length,
73 const std::vector<std::vector<gr_complex> > &preamble);
84 const std::vector<std::vector<gr_complex> > d_preamble;
86 int d_nsymbols_output;
90 void enter_preamble();
91 void enter_first_payload();
96 ~gr_ofdm_insert_preamble();
98 int general_work (int noutput_items,
99 gr_vector_int &ninput_items,
100 gr_vector_const_void_star &input_items,
101 gr_vector_void_star &output_items);
104 #endif /* INCLUDED_GR_OFDM_INSERT_PREAMBLE_H */