154 lines
3.8 KiB
C
154 lines
3.8 KiB
C
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/*---------------------------------------------------------------------------*\
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FILE........: ofdm_internal.h
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AUTHORS.....: David Rowe & Steve Sampson
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DATE CREATED: June 2017
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OFDM Internal definitions.
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\*---------------------------------------------------------------------------*/
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/*
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Copyright (C) 2017 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 OFDM_INTERNAL_H
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#define OFDM_INTERNAL_H
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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#include <complex.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include "codec2_ofdm.h"
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#include "filter.h"
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#include "fdv_arm_math.h"
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#ifndef M_PI
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#define M_PI 3.14159265358979323846f
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#endif
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#define TAU (2.0f * M_PI)
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#define ROT45 (M_PI / 4.0f)
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#define cmplx(value) (COSF(value) + SINF(value) * I)
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#define cmplxconj(value) (COSF(value) + SINF(value) * -I)
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typedef enum {
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search,
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trial,
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synced
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} State;
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typedef enum {
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unsync, /* force sync state machine to lose sync, and search for new sync */
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autosync, /* falls out of sync automatically */
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manualsync /* fall out of sync only under operator control */
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} Sync;
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/*
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* Contains user configuration for OFDM modem
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*/
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struct OFDM_CONFIG {
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float tx_centre; /* TX Centre Audio Frequency */
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float rx_centre; /* RX Centre Audio Frequency */
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float fs; /* Sample Frequency */
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float rs; /* Modulation Symbol Rate */
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float ts; /* symbol duration */
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float tcp; /* Cyclic Prefix duration */
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float ofdm_timing_mx_thresh;
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int nc; /* Number of carriers */
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int ns; /* Number of Symbol frames */
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int bps; /* Bits per Symbol */
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int txtbits; /* number of auxiliary data bits */
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int ftwindowwidth;
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};
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struct OFDM {
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complex float *pilot_samples;
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complex float *rxbuf;
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complex float *pilots;
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complex float **rx_sym;
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complex float *rx_np;
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float *rx_amp;
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float *aphase_est_pilot_log;
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uint8_t *tx_uw;
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State sync_state;
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State last_sync_state;
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State sync_state_interleaver;
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State last_sync_state_interleaver;
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Sync sync_mode;
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struct quisk_cfFilter *ofdm_tx_bpf;
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complex float foff_metric;
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float foff_est_gain;
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float foff_est_hz;
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float timing_mx;
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float coarse_foff_est_hz;
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float timing_norm;
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float sig_var;
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float noise_var;
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float mean_amp;
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int clock_offset_counter;
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int verbose;
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int sample_point;
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int timing_est;
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int timing_valid;
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int nin;
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int uw_errors;
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int sync_counter;
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int frame_count;
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int frame_count_interleaver;
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bool sync_start;
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bool sync_end;
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bool timing_en;
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bool foff_est_en;
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bool phase_est_en;
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bool tx_bpf_en;
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};
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/* function headers exposed for LDPC work */
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complex float qpsk_mod(int *);
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void qpsk_demod(complex float, int *);
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void ofdm_txframe(struct OFDM *, complex float *, complex float []);
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void ofdm_assemble_modem_frame(struct OFDM *, uint8_t [], uint8_t [], uint8_t []);
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void ofdm_assemble_modem_frame_symbols(complex float [], COMP [], uint8_t []);
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void ofdm_disassemble_modem_frame(struct OFDM *, uint8_t [], COMP [], float [], short []);
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void ofdm_rand(uint16_t [], int);
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void ofdm_generate_payload_data_bits(uint8_t payload_data_bits[], int data_bits_per_frame);
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#ifdef __cplusplus
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}
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#endif
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#endif
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