GNU Radio 3.7.1 C++ API
ofdm_cyclic_prefixer.h
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/* -*- c++ -*- */
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/*
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* Copyright 2013 Free Software Foundation, Inc.
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*
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* This file is part of GNU Radio
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*
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* GNU Radio is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3, or (at your option)
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* any later version.
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*
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* GNU Radio is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Radio; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef INCLUDED_DIGITAL_OFDM_CYCLIC_PREFIXER_H
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#define INCLUDED_DIGITAL_OFDM_CYCLIC_PREFIXER_H
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#include <
gnuradio/digital/api.h
>
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#include <
gnuradio/tagged_stream_block.h
>
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namespace
gr {
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namespace
digital {
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/*!
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* \brief Adds a cyclic prefix and performs pulse shaping on OFDM symbols.
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* \ingroup ofdm_blk
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*
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* \details
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* Input: OFDM symbols (in the time domain, i.e. after the IFFT). Optionally,
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* entire frames can be processed. In this case, \p len_tag_key must be
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* specified which holds the key of the tag that denotes how
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* many OFDM symbols are in a frame.
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* Output: A stream of (scalar) complex symbols, which include the cyclic prefix
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* and the pulse shaping.
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* Note: If complete frames are processed, and \p rolloff_len is greater
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* than zero, the final OFDM symbol is followed by the delay line of
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* the pulse shaping.
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*
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* The pulse shape is a raised cosine in the time domain.
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*/
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class
DIGITAL_API
ofdm_cyclic_prefixer
:
virtual
public
tagged_stream_block
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{
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public
:
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typedef
boost::shared_ptr<ofdm_cyclic_prefixer>
sptr
;
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/*!
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* \param input_size FFT length (i.e. length of the OFDM symbols)
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* \param output_size FFT length + cyclic prefix length (in samples)
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* \param rolloff_len Length of the rolloff flank in samples
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* \param len_tag_key For framed processing the key of the length tag
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*/
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static
sptr
make(
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size_t
input_size,
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size_t
output_size,
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int
rolloff_len=0,
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const
std::string &len_tag_key=
""
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);
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};
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}
// namespace digital
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}
// namespace gr
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#endif
/* INCLUDED_DIGITAL_OFDM_CYCLIC_PREFIXER_H */
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gr-digital
include
gnuradio
digital
ofdm_cyclic_prefixer.h
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