mirror of
https://github.com/f4exb/sdrangel.git
synced 2024-11-26 09:48:45 -05:00
138 lines
3.6 KiB
C++
138 lines
3.6 KiB
C++
/*---------------------------------------------------------------------------*\
|
|
|
|
FILE........: ofdm_internal.h
|
|
AUTHORS.....: David Rowe & Steve Sampson
|
|
DATE CREATED: June 2017
|
|
|
|
OFDM Internal definitions.
|
|
|
|
\*---------------------------------------------------------------------------*/
|
|
|
|
/*
|
|
Copyright (C) 2017 David Rowe
|
|
|
|
All rights reserved.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU Lesser General Public License version 2.1, as
|
|
published by the Free Software Foundation. This program 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 Lesser General Public License
|
|
along with this program; if not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#ifndef OFDM_INTERNAL_H
|
|
#define OFDM_INTERNAL_H
|
|
|
|
#include <complex.h>
|
|
#include <stdbool.h>
|
|
#include <stdint.h>
|
|
|
|
#include "codec2_ofdm.h"
|
|
#include "freedv_filter.h"
|
|
#include "fdv_arm_math.h"
|
|
|
|
#ifndef M_PI
|
|
#define M_PI 3.14159265358979323846f
|
|
#endif
|
|
|
|
#define TAU (2.0f * M_PI)
|
|
#define ROT45 float(M_PI / 4.0f)
|
|
|
|
#define cmplx(value) (std::complex<float>{cosf(value), sinf(value)})
|
|
#define cmplxconj(value) (std::complex<float>{cosf(value), -sinf(value)})
|
|
|
|
namespace FreeDV
|
|
{
|
|
|
|
/*
|
|
* Contains user configuration for OFDM modem
|
|
*/
|
|
|
|
struct OFDM_CONFIG {
|
|
float tx_centre; /* TX Centre Audio Frequency */
|
|
float rx_centre; /* RX Centre Audio Frequency */
|
|
float fs; /* Sample Frequency */
|
|
float rs; /* Modulation Symbol Rate */
|
|
float ts; /* symbol duration */
|
|
float tcp; /* Cyclic Prefix duration */
|
|
float ofdm_timing_mx_thresh;
|
|
|
|
int nc; /* Number of carriers */
|
|
int ns; /* Number of Symbol frames */
|
|
int bps; /* Bits per Symbol */
|
|
int txtbits; /* number of auxiliary data bits */
|
|
int ftwindowwidth;
|
|
};
|
|
|
|
struct OFDM {
|
|
std::complex<float> *pilot_samples;
|
|
std::complex<float> *rxbuf;
|
|
std::complex<float> *pilots;
|
|
std::complex<float> **rx_sym;
|
|
std::complex<float> *rx_np;
|
|
|
|
float *rx_amp;
|
|
float *aphase_est_pilot_log;
|
|
|
|
uint8_t *tx_uw;
|
|
|
|
State sync_state;
|
|
State last_sync_state;
|
|
State sync_state_interleaver;
|
|
State last_sync_state_interleaver;
|
|
|
|
Sync sync_mode;
|
|
|
|
struct quisk_cfFilter *ofdm_tx_bpf;
|
|
|
|
std::complex<float> foff_metric;
|
|
|
|
float foff_est_gain;
|
|
float foff_est_hz;
|
|
float timing_mx;
|
|
float coarse_foff_est_hz;
|
|
float timing_norm;
|
|
float sig_var;
|
|
float noise_var;
|
|
float mean_amp;
|
|
|
|
int clock_offset_counter;
|
|
int verbose;
|
|
int sample_point;
|
|
int timing_est;
|
|
int timing_valid;
|
|
int nin;
|
|
int uw_errors;
|
|
int sync_counter;
|
|
int frame_count;
|
|
|
|
int frame_count_interleaver;
|
|
|
|
bool sync_start;
|
|
bool sync_end;
|
|
bool timing_en;
|
|
bool foff_est_en;
|
|
bool phase_est_en;
|
|
bool tx_bpf_en;
|
|
};
|
|
|
|
/* function headers exposed for LDPC work */
|
|
|
|
std::complex<float> qpsk_mod(int *);
|
|
void qpsk_demod(std::complex<float>, int *);
|
|
void ofdm_txframe(struct OFDM *, std::complex<float> *, std::complex<float> []);
|
|
void ofdm_assemble_modem_frame(struct OFDM *, uint8_t [], uint8_t [], uint8_t []);
|
|
void ofdm_assemble_modem_frame_symbols(std::complex<float> [], COMP [], uint8_t []);
|
|
void ofdm_disassemble_modem_frame(struct OFDM *, uint8_t [], COMP [], float [], short []);
|
|
void ofdm_rand(uint16_t [], int);
|
|
void ofdm_generate_payload_data_bits(uint8_t payload_data_bits[], int data_bits_per_frame);
|
|
|
|
} // FreeDV
|
|
|
|
#endif
|