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Diffstat (limited to 'src/codec2_cohpsk.h')
| -rw-r--r-- | src/codec2_cohpsk.h | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/src/codec2_cohpsk.h b/src/codec2_cohpsk.h new file mode 100644 index 0000000..33ab21d --- /dev/null +++ b/src/codec2_cohpsk.h @@ -0,0 +1,71 @@ +/*---------------------------------------------------------------------------*\ + + FILE........: codec2_cohpsk.h + AUTHOR......: David Rowe + DATE CREATED: March 2015 + + Functions that implement a coherent PSK FDM modem. + +\*---------------------------------------------------------------------------*/ + +/* + Copyright (C) 2015 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_COHPSK__ +#define __CODEC2_COHPSK__ + +#define COHPSK_BITS_PER_FRAME 56 +#define COHPSK_NC 7 /* number of carriers */ +#define COHPSK_NOM_SAMPLES_PER_FRAME 600 +#define COHPSK_MAX_SAMPLES_PER_FRAME 625 +#define COHPSK_RS 75 /* symbol rate of each carrier */ +#define COHPSK_FS 7500 /* note this is a weird value to get an integer + oversampling rate */ +#define COHPSK_CLIP 6.5 /* hard clipping for Nc*Nc=14 to reduce PAPR */ +#define COHPSK_SCALE 975 /* suggested scaling for 16 bit shorts */ + +#include "comp.h" +#include "modem_stats.h" + +struct COHPSK; + +extern const int test_bits_coh[]; + +struct COHPSK *cohpsk_create(void); +void cohpsk_destroy(struct COHPSK *coh); +void cohpsk_mod(struct COHPSK *cohpsk, COMP tx_fdm[], int tx_bits[], int nbits); +void cohpsk_clip(COMP tx_fdm[], float clip_thresh, int n); +void cohpsk_demod(struct COHPSK *cohpsk, float rx_bits[], int *sync, COMP rx_fdm[], int *nin_frame); +void cohpsk_get_demod_stats(struct COHPSK *cohpsk, struct MODEM_STATS *stats); +void cohpsk_set_verbose(struct COHPSK *coh, int verbose); +void cohpsk_get_test_bits(struct COHPSK *coh, int rx_bits[]); +void cohpsk_put_test_bits(struct COHPSK *coh, int *state, short error_pattern[], + int *bit_errors, char rx_bits[], int channel); +int cohpsk_error_pattern_size(void); +void cohpsk_set_frame(struct COHPSK *coh, int frame); +void fdmdv_freq_shift_coh(COMP rx_fdm_fcorr[], COMP rx_fdm[], float foff, float Fs, + COMP *foff_phase_rect, int nin); + +void cohpsk_set_freq_est_mode(struct COHPSK *coh, int used_simple_mode); + +/* used for accessing upper and lower bits before diversity combination */ + +float *cohpsk_get_rx_bits_lower(struct COHPSK *coh); +float *cohpsk_get_rx_bits_upper(struct COHPSK *coh); +void cohpsk_set_carrier_ampl(struct COHPSK *coh, int c, float ampl); + +#endif |