/usr/include/itpp/comm/ofdm.h is in libitpp-dev 4.3.1-8.
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* \file
* \brief Interface of an Orthogonal Frequency Division Multiplex
* (OFDM) class
* \author Pal Frenger, Anders Persson and Tony Ottosson
*
* -------------------------------------------------------------------------
*
* Copyright (C) 1995-2010 (see AUTHORS file for a list of contributors)
*
* This file is part of IT++ - a C++ library of mathematical, signal
* processing, speech processing, and communications classes and functions.
*
* IT++ is free software: you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* IT++ is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along
* with IT++. If not, see <http://www.gnu.org/licenses/>.
*
* -------------------------------------------------------------------------
*/
#ifndef OFDM_H
#define OFDM_H
#include <itpp/base/vec.h>
#include <itpp/itexports.h>
namespace itpp
{
/*!
\ingroup modulators
\brief Class for modulating and demodulation of OFDM signals using the FFT
The modulated signal is normalized taking into account the cyclic prefix
*/
class ITPP_EXPORT OFDM
{
public:
//! Empty constructor
OFDM(void) { setup_done = false; }
//! Constructor \a Nfft is the size of the FFT. \a Ncp is the length of the cyclic prefix. \a Nupsample is the upsampling factor (default=1)
OFDM(int inNfft, int inNcp, int inNupsample = 1);
//! Return the number of carriers
int no_carriers() {return Nfft;}
//! Set parameters
void set_parameters(const int Nfft, const int Ncp, const int inNupsample = 1);
//! Modulate complex data symbols. Length of \c input must be an integer multiple of \c Nfft
cvec modulate(const cvec &input);
//! Modulate complex data symbols. Length of \c input must be an integer multiple of \c Nfft
void modulate(const cvec &input, cvec &output);
//! Demodulate to complex valued symbols. Length of \c input must be an integer multiple of \c Nfft+Ncp
cvec demodulate(const cvec &input);
//! Demodulate to complex valued symbols. Length of \c input must be an integer multiple of \c Nfft+Ncp
void demodulate(const cvec &input, cvec &output);
private:
double norm_factor;
bool setup_done;
int Nfft, Ncp, Nupsample;
};
} // namespace itpp
#endif // #ifndef OFDM_H
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