diff options
Diffstat (limited to 'gr-vocoder/lib/codec2/fdmdv_internal.h')
| -rw-r--r-- | gr-vocoder/lib/codec2/fdmdv_internal.h | 176 |
1 files changed, 0 insertions, 176 deletions
diff --git a/gr-vocoder/lib/codec2/fdmdv_internal.h b/gr-vocoder/lib/codec2/fdmdv_internal.h deleted file mode 100644 index 24080e63c8..0000000000 --- a/gr-vocoder/lib/codec2/fdmdv_internal.h +++ /dev/null @@ -1,176 +0,0 @@ -/*---------------------------------------------------------------------------*\ - - FILE........: fdmdv_internal.h - AUTHOR......: David Rowe - DATE CREATED: April 16 2012 - - Header file for FDMDV internal functions, exposed via this header - file for testing. - -\*---------------------------------------------------------------------------*/ - -/* - Copyright (C) 2012 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 __FDMDV_INTERNAL__ -#define __FDMDV_INTERNAL__ - -#include "comp.h" -#include "codec2_fdmdv.h" -#include "kiss_fft.h" - -/*---------------------------------------------------------------------------*\ - - DEFINES - -\*---------------------------------------------------------------------------*/ - -#define PI 3.141592654 -#define FS 8000 /* sample rate in Hz */ -#define T (1.0/FS) /* sample period in seconds */ -#define RS 50 /* symbol rate in Hz */ -#define NC 20 /* max number of data carriers (plus one pilot in the centre) */ -#define NB 2 /* Bits/symbol for QPSK modulation */ -#define RB (NC*RS*NB) /* bit rate */ -#define M (FS/RS) /* oversampling factor */ -#define NSYM 6 /* number of symbols to filter over */ -#define NFILTER (NSYM*M) /* size of tx/rx filters at sample rate M */ - -#define FSEP 75 /* Default separation between carriers (Hz) */ - -#define NT 5 /* number of symbols we estimate timing over */ -#define P 4 /* oversample factor used for initial rx symbol filtering */ -#define NFILTERTIMING (M+NFILTER+M) /* filter memory used for resampling after timing estimation */ - -#define NPILOT_LUT (4*M) /* number of pilot look up table samples */ -#define NPILOTCOEFF 30 /* number of FIR filter coeffs in LP filter */ -#define NPILOTBASEBAND (NPILOTCOEFF+M+M/P) /* number of pilot baseband samples reqd for pilot LPF */ -#define NPILOTLPF (4*M) /* number of samples we DFT pilot over, pilot est window */ -#define MPILOTFFT 256 - -#define NSYNC_MEM 6 - -/* averaging filter coeffs */ - -#define TRACK_COEFF 0.5 -#define SNR_COEFF 0.9 /* SNR est averaging filter coeff */ - -/*---------------------------------------------------------------------------*\ - - STRUCT for States - -\*---------------------------------------------------------------------------*/ - -struct FDMDV { - - int Nc; - float fsep; - - /* test data (test frame) states */ - - int ntest_bits; - int current_test_bit; - int *rx_test_bits_mem; - - /* Modulator */ - - int old_qpsk_mapping; - int tx_pilot_bit; - COMP prev_tx_symbols[NC+1]; - COMP tx_filter_memory[NC+1][NSYM]; - COMP phase_tx[NC+1]; - COMP freq[NC+1]; - - /* Pilot generation at demodulator */ - - COMP pilot_lut[NPILOT_LUT]; - int pilot_lut_index; - int prev_pilot_lut_index; - - /* freq offset estimation states */ - - kiss_fft_cfg fft_pilot_cfg; - COMP pilot_baseband1[NPILOTBASEBAND]; - COMP pilot_baseband2[NPILOTBASEBAND]; - COMP pilot_lpf1[NPILOTLPF]; - COMP pilot_lpf2[NPILOTLPF]; - COMP S1[MPILOTFFT]; - COMP S2[MPILOTFFT]; - - /* freq offset correction states */ - - float foff; - COMP foff_rect; - COMP foff_phase_rect; - - /* Demodulator */ - - COMP phase_rx[NC+1]; - COMP rx_filter_memory[NC+1][NFILTER]; - COMP rx_filter_mem_timing[NC+1][NT*P]; - COMP rx_baseband_mem_timing[NC+1][NFILTERTIMING]; - float rx_timing; - COMP phase_difference[NC+1]; - COMP prev_rx_symbols[NC+1]; - - /* sync state machine */ - - int sync_mem[NSYNC_MEM]; - int fest_state; - int sync; - int timer; - - /* SNR estimation states */ - - float sig_est[NC+1]; - float noise_est[NC+1]; - - /* Buf for FFT/waterfall */ - - float fft_buf[2*FDMDV_NSPEC]; - kiss_fft_cfg fft_cfg; - }; - -/*---------------------------------------------------------------------------*\ - - FUNCTION PROTOTYPES - -\*---------------------------------------------------------------------------*/ - -void bits_to_dqpsk_symbols(COMP tx_symbols[], int Nc, COMP prev_tx_symbols[], int tx_bits[], int *pilot_bit, int old_qpsk_mapping); -void tx_filter(COMP tx_baseband[NC+1][M], int Nc, COMP tx_symbols[], COMP tx_filter_memory[NC+1][NSYM]); -void fdm_upconvert(COMP tx_fdm[], int Nc, COMP tx_baseband[NC+1][M], COMP phase_tx[], COMP freq_tx[]); -void generate_pilot_fdm(COMP *pilot_fdm, int *bit, float *symbol, float *filter_mem, COMP *phase, COMP *freq); -void generate_pilot_lut(COMP pilot_lut[], COMP *pilot_freq); -float rx_est_freq_offset(struct FDMDV *f, COMP rx_fdm[], int nin); -void lpf_peak_pick(float *foff, float *max, COMP pilot_baseband[], COMP pilot_lpf[], kiss_fft_cfg fft_pilot_cfg, COMP S[], int nin); -void freq_shift(COMP rx_fdm_fcorr[], COMP rx_fdm[], float foff, COMP *foff_rect, COMP *foff_phase_rect, int nin); -void fdm_downconvert(COMP rx_baseband[NC+1][M+M/P], int Nc, COMP rx_fdm[], COMP phase_rx[], COMP freq[], int nin); -void rx_filter(COMP rx_filt[NC+1][P+1], int Nc, COMP rx_baseband[NC+1][M+M/P], COMP rx_filter_memory[NC+1][NFILTER], int nin); -float rx_est_timing(COMP rx_symbols[], int Nc, - COMP rx_filt[NC+1][P+1], - COMP rx_baseband[NC+1][M+M/P], - COMP rx_filter_mem_timing[NC+1][NT*P], - float env[], - COMP rx_baseband_mem_timing[NC+1][NFILTERTIMING], - int nin); -float qpsk_to_bits(int rx_bits[], int *sync_bit, int Nc, COMP phase_difference[], COMP prev_rx_symbols[], COMP rx_symbols[], int old_qpsk_mapping); -void snr_update(float sig_est[], float noise_est[], int Nc, COMP phase_difference[]); -int freq_state(int *reliable_sync_bit, int sync_bit, int *state, int *timer, int *sync_mem); -float calc_snr(int Nc, float sig_est[], float noise_est[]); - -#endif |