1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
/*
Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011 Her Majesty
the Queen in Right of Canada (Communications Research Center Canada)
Copyright (C) 2024
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;
};
#ifdef HAVE_DEXTER
#include "iio.h"
// The PrecisionWave DEXTER device contains an FFT accelerator in FPGA
class OfdmGeneratorDEXTER : public ModCodec
{
public:
OfdmGeneratorDEXTER(size_t nbSymbols,
size_t nbCarriers,
size_t spacing,
bool& enableCfr,
float& cfrClip,
float& cfrErrorClip,
bool inverse = true);
virtual ~OfdmGeneratorDEXTER();
OfdmGeneratorDEXTER(const OfdmGeneratorDEXTER&) = delete;
OfdmGeneratorDEXTER& operator=(const OfdmGeneratorDEXTER&) = delete;
int process(Buffer* const dataIn, Buffer* dataOut) override;
const char* name() override { return "OfdmGenerator"; }
private:
struct iio_context *m_ctx = nullptr;
// "in" and "out" are from the point of view of the FFT Accelerator block
struct iio_device *m_dev_in = nullptr;
struct iio_channel *m_channel_in = nullptr;
struct iio_buffer *m_buf_in = nullptr;
struct iio_device *m_dev_out = nullptr;
struct iio_channel *m_channel_out = nullptr;
struct iio_buffer *m_buf_out = nullptr;
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;
};
#endif // HAVE_DEXTER
|
