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102 lines
2.8 KiB
C
102 lines
2.8 KiB
C
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/*---------------------------------------------------------------------------*\
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FILE........: codec2_ofdm.h
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AUTHORS.....: David Rowe & Steve Sampson
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DATE CREATED: June 2017
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External user references to the modem library.
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\*---------------------------------------------------------------------------*/
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/*
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Copyright (C) 2017 David Rowe
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All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License version 2.1, as
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published by the Free Software Foundation. This program is
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distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef CODEC2_OFDM_H
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#define CODEC2_OFDM_H
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/* Includes */
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#include <complex.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include "codec2/comp.h"
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#include "modem_stats.h"
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/* Defines */
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#define OFDM_AMP_SCALE (2E5*1.1491/1.06) /* use to scale to 16 bit short */
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#define OFDM_CLIP (32767*0.35) /* experimentally derived constant to reduce PAPR to about 8dB */
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namespace FreeDV
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{
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struct OFDM_CONFIG;
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struct OFDM;
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typedef enum {
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search,
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trial,
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synced
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} State;
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typedef enum {
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unsync, /* force sync state machine to lose sync, and search for new sync */
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autosync, /* falls out of sync automatically */
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manualsync /* fall out of sync only under operator control */
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} Sync;
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/* create and destroy modem states */
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struct OFDM *ofdm_create(const struct OFDM_CONFIG * config);
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void ofdm_destroy(struct OFDM *);
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/* signal processing */
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void ofdm_mod(struct OFDM *, COMP *, const int *);
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void ofdm_demod(struct OFDM *, int *, COMP *);
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void ofdm_demod_shorts(struct OFDM *, int *, short *, float);
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int ofdm_sync_search(struct OFDM *, COMP *);
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int ofdm_sync_search_shorts(struct OFDM *, short *, float);
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void ofdm_sync_state_machine(struct OFDM *, uint8_t *);
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/* getters */
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struct OFDM_CONFIG *ofdm_get_config_param(void);
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int ofdm_get_nin(struct OFDM *);
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int ofdm_get_samples_per_frame(void);
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int ofdm_get_max_samples_per_frame(void);
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int ofdm_get_bits_per_frame(void);
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void ofdm_get_demod_stats(struct OFDM *ofdm, struct MODEM_STATS *stats);
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/* option setters */
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void ofdm_set_verbose(struct OFDM *, int);
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void ofdm_set_timing_enable(struct OFDM *, bool);
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void ofdm_set_foff_est_enable(struct OFDM *, bool);
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void ofdm_set_phase_est_enable(struct OFDM *, bool);
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void ofdm_set_off_est_hz(struct OFDM *, float);
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void ofdm_set_sync(struct OFDM *, Sync);
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void ofdm_set_tx_bpf(struct OFDM *, bool);
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void ofdm_print_info(struct OFDM *);
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} // FreeDV
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#endif
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