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-rw-r--r--src/fdmdv_internal.h236
1 files changed, 126 insertions, 110 deletions
diff --git a/src/fdmdv_internal.h b/src/fdmdv_internal.h
index aa9d683..cb3bea2 100644
--- a/src/fdmdv_internal.h
+++ b/src/fdmdv_internal.h
@@ -29,9 +29,9 @@
#ifndef __FDMDV_INTERNAL__
#define __FDMDV_INTERNAL__
-#include "comp.h"
#include "codec2_fdmdv.h"
#include "codec2_fft.h"
+#include "comp.h"
/*---------------------------------------------------------------------------*\
@@ -40,42 +40,46 @@
\*---------------------------------------------------------------------------*/
#ifndef PI
-#define PI 3.141592654
+#define PI 3.141592654
#endif
-#define FS 8000 /* sample rate in Hz */
-#define FS_VOICE_8K 8000 /* speech sample rate, 8000 Hz */
-#define FS_VOICE_16K 16000 /* speech sample rate, 16000 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_FAC (FS/RS) /* oversampling factor */
-#define NSYM 6 /* number of symbols to filter over */
-#define NFILTER (NSYM*M_FAC) /* 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 output */
-#define Q (M_FAC/4) /* oversample factor used for initial rx symbol filtering input */
-#define NRXDEC 31 /* number of taps in the rx decimation filter */
-
-#define NPILOT_LUT (4*M_FAC) /* number of pilot look up table samples */
-#define NPILOTCOEFF 30 /* number of FIR filter coeffs in LP filter */
-#define NPILOTBASEBAND (NPILOTCOEFF+M_FAC+M_FAC/P) /* number of pilot baseband samples reqd for pilot LPF */
-#define NPILOTLPF (4*M_FAC) /* number of samples we DFT pilot over, pilot est window */
-#define MPILOTFFT 256
-
-#define NSYNC_MEM 6
-
-#define NRX_FDM_MEM (NFILTER+M_FAC+M_FAC/P) /* size of rx filter memory */
-#define NRXDECMEM (NRXDEC+M_FAC+M_FAC/P) /* size of rx decimation filter memory */
+#define FS 8000 /* sample rate in Hz */
+#define FS_VOICE_8K 8000 /* speech sample rate, 8000 Hz */
+#define FS_VOICE_16K 16000 /* speech sample rate, 16000 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_FAC (FS / RS) /* oversampling factor */
+#define NSYM 6 /* number of symbols to filter over */
+#define NFILTER (NSYM * M_FAC) /* 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 /* oversampling for initial rx symbol filtering output */
+#define Q (M_FAC / 4) /* oversampling for initial rx symbol filtering input */
+#define NRXDEC 31 /* number of taps in the rx decimation filter */
+
+#define NPILOT_LUT (4 * M_FAC) /* number of pilot look up table samples */
+#define NPILOTCOEFF 30 /* number of FIR filter coeffs in LP filter */
+/* number of pilot baseband samples reqd for pilot LPF */
+#define NPILOTBASEBAND (NPILOTCOEFF + M_FAC + M_FAC / P)
+/* number of samples we DFT pilot over, pilot est window */
+#define NPILOTLPF (4 * M_FAC)
+#define MPILOTFFT 256
+
+#define NSYNC_MEM 6
+
+/* size of rx filter memory */
+#define NRX_FDM_MEM (NFILTER + M_FAC + M_FAC / P)
+/* size of rx decimation filter memory */
+#define NRXDECMEM (NRXDEC + M_FAC + M_FAC / P)
/* averaging filter coeffs */
-#define TRACK_COEFF 0.5
-#define SNR_COEFF 0.9 /* SNR est averaging filter coeff */
+#define TRACK_COEFF 0.5
+#define SNR_COEFF 0.9 /* SNR est averaging filter coeff */
/*---------------------------------------------------------------------------*\
@@ -84,80 +88,79 @@
\*---------------------------------------------------------------------------*/
struct FDMDV {
+ int Nc;
+ float fsep;
- int Nc;
- float fsep;
-
- /* test data (test frame) states */
+ /* test data (test frame) states */
- int ntest_bits;
- int current_test_bit;
- int *rx_test_bits_mem;
+ int ntest_bits;
+ int current_test_bit;
+ int *rx_test_bits_mem;
- /* Modulator */
+ /* 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];
- float freq_pol[NC+1];
+ 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];
+ float freq_pol[NC + 1];
- /* Pilot generation at demodulator */
+ /* Pilot generation at demodulator */
- COMP pilot_lut[NPILOT_LUT];
- int pilot_lut_index;
- int prev_pilot_lut_index;
+ COMP pilot_lut[NPILOT_LUT];
+ int pilot_lut_index;
+ int prev_pilot_lut_index;
- /* freq offset estimation states */
+ /* freq offset estimation states */
- codec2_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];
+ codec2_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];
- /* baseband to low IF carrier states */
+ /* baseband to low IF carrier states */
- COMP fbb_rect;
- float fbb_pol;
- COMP fbb_phase_tx;
- COMP fbb_phase_rx;
+ COMP fbb_rect;
+ float fbb_pol;
+ COMP fbb_phase_tx;
+ COMP fbb_phase_rx;
- /* freq offset correction states */
+ /* freq offset correction states */
- float foff;
- COMP foff_phase_rect;
- float foff_filt;
+ float foff;
+ COMP foff_phase_rect;
+ float foff_filt;
- /* Demodulator */
+ /* Demodulator */
- COMP rxdec_lpf_mem[NRXDECMEM];
- COMP rx_fdm_mem[NRX_FDM_MEM];
- COMP phase_rx[NC+1];
- COMP rx_filter_mem_timing[NC+1][NT*P];
- float rx_timing;
- COMP phase_difference[NC+1];
- COMP prev_rx_symbols[NC+1];
+ COMP rxdec_lpf_mem[NRXDECMEM];
+ COMP rx_fdm_mem[NRX_FDM_MEM];
+ COMP phase_rx[NC + 1];
+ COMP rx_filter_mem_timing[NC + 1][NT * P];
+ float rx_timing;
+ COMP phase_difference[NC + 1];
+ COMP prev_rx_symbols[NC + 1];
- /* sync state machine */
+ /* sync state machine */
- int sync_mem[NSYNC_MEM];
- int fest_state;
- int sync;
- int timer;
+ int sync_mem[NSYNC_MEM];
+ int fest_state;
+ int sync;
+ int timer;
- /* SNR estimation states */
+ /* SNR estimation states */
- float sig_est[NC+1];
- float noise_est[NC+1];
+ float sig_est[NC + 1];
+ float noise_est[NC + 1];
- /* channel simulation */
+ /* channel simulation */
- float sig_pwr_av;
+ float sig_pwr_av;
};
/*---------------------------------------------------------------------------*\
@@ -166,32 +169,45 @@ struct FDMDV {
\*---------------------------------------------------------------------------*/
-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_FAC], 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_FAC], COMP phase_tx[], COMP freq_tx[],
- COMP *fbb_phase, COMP fbb_rect);
+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_FAC], 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_FAC],
+ COMP phase_tx[], COMP freq_tx[], COMP *fbb_phase,
+ COMP fbb_rect);
void tx_filter_and_upconvert(COMP tx_fdm[], int Nc, COMP tx_symbols[],
- COMP tx_filter_memory[NC+1][NSYM],
- COMP phase_tx[], COMP freq[], COMP *fbb_phase, COMP fbb_rect);
-void generate_pilot_fdm(COMP *pilot_fdm, int *bit, float *symbol, float *filter_mem, COMP *phase, COMP *freq);
+ COMP tx_filter_memory[NC + 1][NSYM],
+ COMP phase_tx[], COMP freq[], COMP *fbb_phase,
+ COMP fbb_rect);
+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, int do_fft);
-void lpf_peak_pick(float *foff, float *max, COMP pilot_baseband[], COMP pilot_lpf[], codec2_fft_cfg fft_pilot_cfg, COMP S[], int nin, int do_fft);
-void fdm_downconvert(COMP rx_baseband[NC+1][M_FAC+M_FAC/P], int Nc, COMP rx_fdm[], COMP phase_rx[], COMP freq[], int nin);
-void rxdec_filter(COMP rx_fdm_filter[], COMP rx_fdm[], COMP rxdec_lpf_mem[], int nin);
-void rx_filter(COMP rx_filt[][P+1], int Nc, COMP rx_baseband[][M_FAC+M_FAC/P], COMP rx_filter_memory[][NFILTER], int nin);
-void down_convert_and_rx_filter(COMP rx_filt[NC+1][P+1], int Nc, COMP rx_fdm[],
- COMP rx_fdm_mem[], COMP phase_rx[], COMP freq[],
- float freq_pol[], int nin, int dec_rate);
-float rx_est_timing(COMP rx_symbols[], int Nc,
- COMP rx_filt[][P+1],
- COMP rx_filter_mem_timing[][NT*P],
- float env[],
- int nin,
- int m);
-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);
+void lpf_peak_pick(float *foff, float *max, COMP pilot_baseband[],
+ COMP pilot_lpf[], codec2_fft_cfg fft_pilot_cfg, COMP S[],
+ int nin, int do_fft);
+void fdm_downconvert(COMP rx_baseband[NC + 1][M_FAC + M_FAC / P], int Nc,
+ COMP rx_fdm[], COMP phase_rx[], COMP freq[], int nin);
+void rxdec_filter(COMP rx_fdm_filter[], COMP rx_fdm[], COMP rxdec_lpf_mem[],
+ int nin);
+void rx_filter(COMP rx_filt[][P + 1], int Nc,
+ COMP rx_baseband[][M_FAC + M_FAC / P],
+ COMP rx_filter_memory[][NFILTER], int nin);
+void down_convert_and_rx_filter(COMP rx_filt[NC + 1][P + 1], int Nc,
+ COMP rx_fdm[], COMP rx_fdm_mem[],
+ COMP phase_rx[], COMP freq[], float freq_pol[],
+ int nin, int dec_rate);
+float rx_est_timing(COMP rx_symbols[], int Nc, COMP rx_filt[][P + 1],
+ COMP rx_filter_mem_timing[][NT * P], float env[], int nin,
+ int m);
+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
generated by cgit v1.2.3 (git 2.46.0) at 2026-01-26 21:30:45 +0000