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77 lines
2.9 KiB
C
77 lines
2.9 KiB
C
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/*---------------------------------------------------------------------------*\
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FILE........: codec2_cohpsk.h
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AUTHOR......: David Rowe
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DATE CREATED: March 2015
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Functions that implement a coherent PSK FDM modem.
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\*---------------------------------------------------------------------------*/
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/*
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Copyright (C) 2015 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_COHPSK__
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#define __CODEC2_COHPSK__
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#define COHPSK_BITS_PER_FRAME 56 /* hard coded for now */
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#define COHPSK_NC 7 /* hard coded for now */
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#define COHPSK_NOM_SAMPLES_PER_FRAME 600
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#define COHPSK_MAX_SAMPLES_PER_FRAME 625
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#define COHPSK_RS 75
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#define COHPSK_FS 7500 /* note this is a wierd
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value to get an integer
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oversampling rate */
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#define COHPSK_CLIP 6.5 /* hard clipping for Nc*Nc=14 to reduce PAPR */
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#include "codec2/comp.h"
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#include "modem_stats.h"
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namespace FreeDV
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{
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struct COHPSK;
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extern const int test_bits_coh[];
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struct COHPSK *cohpsk_create(void);
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void cohpsk_destroy(struct COHPSK *coh);
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void cohpsk_mod(struct COHPSK *cohpsk, COMP tx_fdm[], int tx_bits[], int nbits);
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void cohpsk_clip(COMP tx_fdm[], float clip_thresh, int n);
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void cohpsk_demod(struct COHPSK *cohpsk, float rx_bits[], int *sync, COMP rx_fdm[], int *nin_frame);
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void cohpsk_get_demod_stats(struct COHPSK *cohpsk, struct MODEM_STATS *stats);
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void cohpsk_set_verbose(struct COHPSK *coh, int verbose);
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void cohpsk_get_test_bits(struct COHPSK *coh, int rx_bits[]);
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void cohpsk_put_test_bits(struct COHPSK *coh, int *state, short error_pattern[],
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int *bit_errors, char rx_bits[], int channel);
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int cohpsk_error_pattern_size(void);
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void cohpsk_set_frame(struct COHPSK *coh, int frame);
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void fdmdv_freq_shift_coh(COMP rx_fdm_fcorr[], COMP rx_fdm[], float foff, float Fs,
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COMP *foff_phase_rect, int nin);
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void cohpsk_set_freq_est_mode(struct COHPSK *coh, int used_simple_mode);
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/* used for accessing upper and lower bits before diversity combination */
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float *cohpsk_get_rx_bits_lower(struct COHPSK *coh);
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float *cohpsk_get_rx_bits_upper(struct COHPSK *coh);
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void cohpsk_set_carrier_ampl(struct COHPSK *coh, int c, float ampl);
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} // FreeDV
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#endif
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