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)
12 * GNU Radio is distributed in the hope that it will be useful,
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.
39 * input 1: stream of vectors of gr_complex [fft_length]
40 * These are the modulated symbols of the payload.
42 * input 2: stream of char. The LSB indicates whether the corresponding
43 * symbol on input 1 is the first symbol of the payload or not.
44 * It's a 1 if the corresponding symbol is the first symbol,
47 * N.B., this implies that there must be at least 1 symbol in the payload.
50 * output 1: stream of vectors of gr_complex [fft_length]
51 * These include the preamble symbols and the payload symbols.
53 * output 2: stream of char. The LSB indicates whether the corresponding
54 * symbol on input 1 is the first symbol of a packet (i.e., the
55 * first symbol of the preamble.) It's a 1 if the corresponding
56 * symbol is the first symbol, otherwise 0.
59 * \param fft_length length of each symbol in samples.
60 * \param preamble vector of symbols that represent the pre-modulated preamble.
63 class gr_ofdm_insert_preamble : public gr_block
65 friend gr_ofdm_insert_preamble_sptr
66 gr_make_ofdm_insert_preamble(int fft_length,
67 const std::vector<std::vector<gr_complex> > &preamble);
70 gr_ofdm_insert_preamble(int fft_length,
71 const std::vector<std::vector<gr_complex> > &preamble);
82 const std::vector<std::vector<gr_complex> > d_preamble;
84 int d_nsymbols_output;
88 void enter_preamble();
89 void enter_first_payload();
94 ~gr_ofdm_insert_preamble();
96 int general_work (int noutput_items,
97 gr_vector_int &ninput_items,
98 gr_vector_const_void_star &input_items,
99 gr_vector_void_star &output_items);
102 #endif /* INCLUDED_GR_OFDM_INSERT_PREAMBLE_H */