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80 lines
3.0 KiB
C
80 lines
3.0 KiB
C
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/*---------------------------------------------------------------------------*\
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FILE........: modem_stats.h
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AUTHOR......: David Rowe
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DATE CREATED: June 2015
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Common structure for returning demod stats from fdmdv and cohpsk modems.
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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 __FREEDV_MODEM_STATS__
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#define __FREEDV_MODEM_STATS__
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#include "codec2/comp.h"
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#include "kiss_fft.h"
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#define MODEM_STATS_NC_MAX 20
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#define MODEM_STATS_NR_MAX 8
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#define MODEM_STATS_ET_MAX 8
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#define MODEM_STATS_EYE_IND_MAX 160
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#define MODEM_STATS_NSPEC 512
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#define MODEM_STATS_MAX_F_HZ 4000
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#define MODEM_STATS_MAX_F_EST 4
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namespace FreeDV
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{
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struct MODEM_STATS {
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int Nc;
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float snr_est; /* estimated SNR of rx signal in dB (3 kHz noise BW) */
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COMP rx_symbols[MODEM_STATS_NR_MAX][MODEM_STATS_NC_MAX+1];
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/* latest received symbols, for scatter plot */
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int nr; /* number of rows in rx_symbols */
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int sync; /* demod sync state */
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float foff; /* estimated freq offset in Hz */
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float rx_timing; /* estimated optimum timing offset in samples */
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float clock_offset; /* Estimated tx/rx sample clock offset in ppm */
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float sync_metric; /* number between 0 and 1 indicating quality of sync */
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/* eye diagram traces */
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/* Eye diagram plot -- first dim is trace number, second is the trace idx */
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float rx_eye[MODEM_STATS_ET_MAX][MODEM_STATS_EYE_IND_MAX];
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int neyetr; /* How many eye traces are plotted */
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int neyesamp; /* How many samples in the eye diagram */
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/* optional for FSK modems - est tone freqs */
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float f_est[MODEM_STATS_MAX_F_EST];
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/* Buf for FFT/waterfall */
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float fft_buf[2*MODEM_STATS_NSPEC];
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kiss_fft_cfg fft_cfg;
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};
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void modem_stats_open(struct MODEM_STATS *f);
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void modem_stats_close(struct MODEM_STATS *f);
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void modem_stats_get_rx_spectrum(struct MODEM_STATS *f, float mag_spec_dB[], COMP rx_fdm[], int nin);
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} // FreeDV
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#endif
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