GNU Radio Manual and C++ API Reference 3.8.5.0
The Free & Open Software Radio Ecosystem
 
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ofdm_cyclic_prefixer.h
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1/* -*- c++ -*- */
2/*
3 * Copyright 2013 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
23#ifndef INCLUDED_DIGITAL_OFDM_CYCLIC_PREFIXER_H
24#define INCLUDED_DIGITAL_OFDM_CYCLIC_PREFIXER_H
25
28
29namespace gr {
30namespace digital {
31
32/*!
33 * \brief Adds a cyclic prefix and performs pulse shaping on OFDM symbols.
34 * \ingroup ofdm_blk
35 *
36 * \details
37 * Input: OFDM symbols (in the time domain, i.e. after the IFFT). Optionally,
38 * entire frames can be processed. In this case, \p len_tag_key must be
39 * specified which holds the key of the tag that denotes how
40 * many OFDM symbols are in a frame.
41 * Output: A stream of (scalar) complex symbols, which include the cyclic prefix
42 * and the pulse shaping.
43 * Note: If complete frames are processed, and \p rolloff_len is greater
44 * than zero, the final OFDM symbol is followed by the delay line of
45 * the pulse shaping.
46 *
47 * The pulse shape is a raised cosine in the time domain.
48 */
50{
51public:
52 typedef boost::shared_ptr<ofdm_cyclic_prefixer> sptr;
53
54 /*!
55 * \param input_size FFT length (i.e. length of the OFDM symbols)
56 * \param output_size FFT length + cyclic prefix length (in samples)
57 * \param rolloff_len Length of the rolloff flank in samples
58 * \param len_tag_key For framed processing the key of the length tag
59 */
60 static sptr make(size_t input_size,
61 size_t output_size,
62 int rolloff_len = 0,
63 const std::string& len_tag_key = "");
64};
65
66} // namespace digital
67} // namespace gr
68
69#endif /* INCLUDED_DIGITAL_OFDM_CYCLIC_PREFIXER_H */
Adds a cyclic prefix and performs pulse shaping on OFDM symbols.
Definition ofdm_cyclic_prefixer.h:50
static sptr make(size_t input_size, size_t output_size, int rolloff_len=0, const std::string &len_tag_key="")
boost::shared_ptr< ofdm_cyclic_prefixer > sptr
Definition ofdm_cyclic_prefixer.h:52
Block that operates on PDUs in form of tagged streams.
Definition tagged_stream_block.h:38
#define DIGITAL_API
Definition gr-digital/include/gnuradio/digital/api.h:30
GNU Radio logging wrapper for log4cpp library (C++ port of log4j)
Definition basic_block.h:46