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/*
Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011 Her Majesty
the Queen in Right of Canada (Communications Research Center Canada)
Copyright (C) 2023
Matthias P. Braendli, matthias.braendli@mpb.li
http://opendigitalradio.org
*/
/*
This file is part of ODR-DabMod.
ODR-DabMod 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.
ODR-DabMod 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 ODR-DabMod. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "ModPlugin.h"
#include "RemoteControl.h"
#include "PAPRStats.h"
#include "kiss_fft.h"
#include <fftw3.h>
#include <cstddef>
#include <atomic>
// Complex Float uses FFTW
class OfdmGeneratorCF32 : public ModCodec, public RemoteControllable
{
public:
OfdmGeneratorCF32(size_t nbSymbols,
size_t nbCarriers,
size_t spacing,
bool& enableCfr,
float& cfrClip,
float& cfrErrorClip,
bool inverse = true);
virtual ~OfdmGeneratorCF32();
OfdmGeneratorCF32(const OfdmGeneratorCF32&) = delete;
OfdmGeneratorCF32& operator=(const OfdmGeneratorCF32&) = delete;
int process(Buffer* const dataIn, Buffer* dataOut) override;
const char* name() override { return "OfdmGenerator"; }
/* Functions for the remote control */
virtual void set_parameter(const std::string& parameter, const std::string& value) override;
virtual const std::string get_parameter(const std::string& parameter) const override;
virtual const json::map_t get_all_values() const override;
protected:
struct cfr_iter_stat_t {
size_t clip_count = 0;
size_t errclip_count = 0;
};
cfr_iter_stat_t cfr_one_iteration(
complexf *symbol, const complexf *reference);
fftwf_plan myFftPlan;
fftwf_complex *myFftIn, *myFftOut;
const size_t myNbSymbols;
const size_t myNbCarriers;
const size_t mySpacing;
unsigned myPosSrc;
unsigned myPosDst;
unsigned myPosSize;
unsigned myNegSrc;
unsigned myNegDst;
unsigned myNegSize;
unsigned myZeroDst;
unsigned myZeroSize;
bool& myCfr; // Whether to enable crest factor reduction
mutable std::mutex myCfrRcMutex;
float& myCfrClip;
float& myCfrErrorClip;
fftwf_plan myCfrFft;
fftwf_complex *myCfrPostClip;
fftwf_complex *myCfrPostFft;
// Statistics for CFR
std::deque<double> myClipRatios;
std::deque<double> myErrorClipRatios;
// Measure PAPR before and after CFR
PAPRStats myPaprBeforeCFR;
PAPRStats myPaprAfterCFR;
std::atomic<bool> myPaprClearRequest;
size_t myMERCalcIndex = 0;
std::deque<double> myMERs;
};
// Fixed point implementation uses KISS FFT with -DFIXED_POINT=32
class OfdmGeneratorFixed : public ModCodec
{
public:
OfdmGeneratorFixed(size_t nbSymbols,
size_t nbCarriers,
size_t spacing,
bool& enableCfr,
float& cfrClip,
float& cfrErrorClip,
bool inverse = true);
virtual ~OfdmGeneratorFixed();
OfdmGeneratorFixed(const OfdmGeneratorFixed&) = delete;
OfdmGeneratorFixed& operator=(const OfdmGeneratorFixed&) = delete;
int process(Buffer* const dataIn, Buffer* dataOut) override;
const char* name() override { return "OfdmGenerator"; }
private:
kiss_fft_cfg myKissCfg = nullptr;
kiss_fft_cpx *myFftIn, *myFftOut;
const size_t myNbSymbols;
const size_t myNbCarriers;
const size_t mySpacing;
unsigned myPosSrc;
unsigned myPosDst;
unsigned myPosSize;
unsigned myNegSrc;
unsigned myNegDst;
unsigned myNegSize;
unsigned myZeroDst;
unsigned myZeroSize;
};
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