mirror of
https://github.com/f4exb/sdrangel.git
synced 2025-11-03 21:20:31 -05:00
102 lines
2.8 KiB
C
102 lines
2.8 KiB
C
|
/*---------------------------------------------------------------------------*\
|
||
|
|
|
||
|
|
FILE........: codec2_ofdm.h
|
||
|
|
AUTHORS.....: David Rowe & Steve Sampson
|
||
|
|
DATE CREATED: June 2017
|
||
|
|
|
||
|
|
External user references to the modem library.
|
||
|
|
|
||
|
|
\*---------------------------------------------------------------------------*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
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 CODEC2_OFDM_H
|
||
|
|
#define CODEC2_OFDM_H
|
||
|
|
|
||
|
|
/* Includes */
|
||
|
|
|
||
|
|
#include <complex.h>
|
||
|
|
#include <stdbool.h>
|
||
|
|
#include <stdint.h>
|
||
|
|
|
||
|
|
#include "codec2/comp.h"
|
||
|
|
#include "modem_stats.h"
|
||
|
|
|
||
|
|
/* Defines */
|
||
|
|
|
||
|
|
#define OFDM_AMP_SCALE (2E5*1.1491/1.06) /* use to scale to 16 bit short */
|
||
|
|
#define OFDM_CLIP (32767*0.35) /* experimentally derived constant to reduce PAPR to about 8dB */
|
||
|
|
|
||
|
|
namespace FreeDV
|
||
|
|
{
|
||
|
|
|
||
|
|
struct OFDM_CONFIG;
|
||
|
|
struct OFDM;
|
||
|
|
|
||
|
|
typedef enum {
|
||
|
|
search,
|
||
|
|
trial,
|
||
|
|
synced
|
||
|
|
} State;
|
||
|
|
|
||
|
|
typedef enum {
|
||
|
|
unsync, /* force sync state machine to lose sync, and search for new sync */
|
||
|
|
autosync, /* falls out of sync automatically */
|
||
|
|
manualsync /* fall out of sync only under operator control */
|
||
|
|
} Sync;
|
||
|
|
|
||
|
|
/* create and destroy modem states */
|
||
|
|
|
||
|
|
struct OFDM *ofdm_create(const struct OFDM_CONFIG * config);
|
||
|
|
void ofdm_destroy(struct OFDM *);
|
||
|
|
|
||
|
|
/* signal processing */
|
||
|
|
|
||
|
|
void ofdm_mod(struct OFDM *, COMP *, const int *);
|
||
|
|
void ofdm_demod(struct OFDM *, int *, COMP *);
|
||
|
|
void ofdm_demod_shorts(struct OFDM *, int *, short *, float);
|
||
|
|
int ofdm_sync_search(struct OFDM *, COMP *);
|
||
|
|
int ofdm_sync_search_shorts(struct OFDM *, short *, float);
|
||
|
|
void ofdm_sync_state_machine(struct OFDM *, uint8_t *);
|
||
|
|
|
||
|
|
/* getters */
|
||
|
|
|
||
|
|
struct OFDM_CONFIG *ofdm_get_config_param(void);
|
||
|
|
int ofdm_get_nin(struct OFDM *);
|
||
|
|
int ofdm_get_samples_per_frame(void);
|
||
|
|
int ofdm_get_max_samples_per_frame(void);
|
||
|
|
int ofdm_get_bits_per_frame(void);
|
||
|
|
void ofdm_get_demod_stats(struct OFDM *ofdm, struct MODEM_STATS *stats);
|
||
|
|
|
||
|
|
/* option setters */
|
||
|
|
|
||
|
|
void ofdm_set_verbose(struct OFDM *, int);
|
||
|
|
void ofdm_set_timing_enable(struct OFDM *, bool);
|
||
|
|
void ofdm_set_foff_est_enable(struct OFDM *, bool);
|
||
|
|
void ofdm_set_phase_est_enable(struct OFDM *, bool);
|
||
|
|
void ofdm_set_off_est_hz(struct OFDM *, float);
|
||
|
|
void ofdm_set_sync(struct OFDM *, Sync);
|
||
|
|
void ofdm_set_tx_bpf(struct OFDM *, bool);
|
||
|
|
|
||
|
|
void ofdm_print_info(struct OFDM *);
|
||
|
|
|
||
|
|
} // FreeDV
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|