pi4cxpsk.h

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/* GMR-1 SDR - pi2-CBPSK, pi4-CBPSK and pi4-CQPSK modulation support */
/* See GMR-1 05.004 (ETSI TS 101 376-5-4 V1.2.1) - Section 5.1 & 5.2 */
 
/* (C) 2011-2019 by Sylvain Munaut <tnt@246tNt.com>
 * All Rights Reserved
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef __OSMO_GMR1_SDR_PI4CXPSK_H__
#define __OSMO_GMR1_SDR_PI4CXPSK_H__
 
#include <stdint.h>
#include <osmocom/core/bits.h>
#include <osmocom/dsp/cxvec.h>
 
 
#define GMR1_MAX_SYM_EBITS      2       
#define GMR1_MAX_SYNC           4       
#define GMR1_MAX_SYNC_SYMS      32      
struct gmr1_pi4cxpsk_symbol {
        short  idx;                     
        ubit_t data[GMR1_MAX_SYM_EBITS];
        float  mod_phase;               
        float complex mod_val;          
};
 
struct gmr1_pi4cxpsk_modulation {
        float rotation;                         
        int nbits;                              
        struct gmr1_pi4cxpsk_symbol *syms;      
        struct gmr1_pi4cxpsk_symbol *bits;      
};
 
 
extern struct gmr1_pi4cxpsk_modulation gmr1_pi2cbpsk;
extern struct gmr1_pi4cxpsk_modulation gmr1_pi4cbpsk;
extern struct gmr1_pi4cxpsk_modulation gmr1_pi4cqpsk;
 
 
struct gmr1_pi4cxpsk_sync {
        int pos;                                
        int len;                                
        uint8_t syms[GMR1_MAX_SYNC_SYMS];       
        struct osmo_cxvec *_ref;                
};
 
struct gmr1_pi4cxpsk_data {
        int pos;                        
        int len;                        
};
 
struct gmr1_pi4cxpsk_burst {
        struct gmr1_pi4cxpsk_modulation *mod;
 
        int guard_pre;
        int guard_post;
 
        int len;
        int ebits;
 
        struct gmr1_pi4cxpsk_sync *sync[GMR1_MAX_SYNC];
        struct gmr1_pi4cxpsk_data *data;
};
 
 
int
gmr1_pi4cxpsk_demod(struct gmr1_pi4cxpsk_burst *burst_type,
                    struct osmo_cxvec *burst_in, int sps, float freq_shift,
                    sbit_t *ebits,
                    int *sync_id_p, float *toa_p, float *freq_err_p);
 
int
gmr1_pi4cxpsk_detect(struct gmr1_pi4cxpsk_burst **burst_types, float e_toa,
                     struct osmo_cxvec *burst_in, int sps, float freq_shift,
                     int *bt_id_p, int *sync_id_p, float *toa_p);
 
int
gmr1_pi4cxpsk_mod_order(struct osmo_cxvec *burst_in, int sps, float freq_shift);
 
int
gmr1_pi4cxpsk_mod(struct gmr1_pi4cxpsk_burst *burst_type,
                  ubit_t *ebits, int sync_id, struct osmo_cxvec *burst_out);
 
 
#endif /* __OSMO_GMR1_SDR_PI4CXPSK_H__ */