GNU Radio's DAB Package
ofdm_sampler_impl.h
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1/* -*- c++ -*- */
2/*
3 * Copyright 2004 Free Software Foundation, Inc.
4 *
5 * This file is part of GNU Radio
6 *
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)
10 * any later version.
11 *
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.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with GNU Radio; see the file COPYING. If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street,
20 * Boston, MA 02110-1301, USA.
21 */
22#ifndef INCLUDED_DAB_OFDM_SAMPLER_IMPL_H
23#define INCLUDED_DAB_OFDM_SAMPLER_IMPL_H
24
25#include <dab/ofdm_sampler.h>
26
27namespace gr {
28 namespace dab {
29
30/*!
31 * \brief cuts stream of DAB samples into symbol vectors
32 * \ingroup DAB
33 * \param fft_length length of the output vectors - number of samples per symbol without cyclic prefix
34 * \param cp_length lengith of the cyclic prefix
35 * \param symbols_per_frame number of symbols in a DAB frame, without Null symbol
36 * \param gap If the gap is > 0, leave a gap at the end of the symbol, i.e. return some of the cyclic prefix instead of the end of the symbol
37 *
38 * input: port 0: complex - actual data; port 1: byte stream with trigger signal indicating the start of a frame
39 * output: port 0: complex vectors - sampled data; port 1: byte stream with trigger signal indicating the start of a frame
40 */
42{
43 private:
44
45 enum state_t {STATE_NS, STATE_CP, STATE_SYM};
46
47 state_t d_state;
48 unsigned int d_pos; // position inside OFDM symbol
49 unsigned int d_fft_length;
50 unsigned int d_cp_length;
51 unsigned int d_symbols_per_frame; // total number of symbols in a DAB frame
52 unsigned int d_sym_nr; // number of symbol inside DAB frame
53 unsigned int d_gap; // gap from next symbol -> if gap>0: sample before end of frame
54 unsigned int d_gap_left; // gap left to next symbol?
55
56 public:
57 ofdm_sampler_impl(unsigned int fft_length, unsigned int cp_length, unsigned int symbols_per_frame,unsigned int gap);
58 void forecast (int noutput_items, gr_vector_int &ninput_items_required);
59
60 int general_work (int noutput_items,
61 gr_vector_int &ninput_items,
62 gr_vector_const_void_star &input_items,
63 gr_vector_void_star &output_items);
64};
65
66}
67}
68
69#endif /* INCLUDED_DAB_OFDM_SAMPLER_H */
cuts stream of DAB samples into symbol vectors
Definition ofdm_sampler_impl.h:42
ofdm_sampler_impl(unsigned int fft_length, unsigned int cp_length, unsigned int symbols_per_frame, unsigned int gap)
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)
<+description of block+>
Definition ofdm_sampler.h:37
Definition complex_to_interleaved_float_vcf.h:28