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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) 2011-2016 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__
/*! \defgroup pi4cxpsk pi2-CBPSK, pi4-CBPSK and pi4-CQPSK modulation
* \ingroup sdr
* @{
*/
/*! \file sdr/pi4cxpsk.h
* \brief Osmocom GMR-1 pi2-CBPSK, pi4-CBPSK and pi4-CQPSK modulation support header
*/
#include <stdint.h>
#include <osmocom/core/bits.h>
#include <osmocom/dsp/cxvec.h>
#define GMR1_MAX_SYM_EBITS 2 /*!< \brief Max e bits in a symbol */
#define GMR1_MAX_SYNC 4 /*!< \brief Max diff. sync seqs */
#define GMR1_MAX_SYNC_SYMS 32 /*!< \brief Max sym in a sync seq */
/*! \brief pi4-CxPSK symbol description */
struct gmr1_pi4cxpsk_symbol {
short idx; /*!< \brief Symbol number */
ubit_t data[GMR1_MAX_SYM_EBITS];/*!< \brief Encoded data bits */
float mod_phase; /*!< \brief Phase used during mod. */
float complex mod_val; /*!< \brief e^(1j*mod_phase) */
};
/*! \brief pi4-CxPSK modulation description */
struct gmr1_pi4cxpsk_modulation {
float rotation; /*!< \brief rotation per symbol */
int nbits; /*!< \brief ebits/sym */
struct gmr1_pi4cxpsk_symbol *syms; /*!< \brief Symbols (sym order) */
struct gmr1_pi4cxpsk_symbol *bits; /*!< \brief Symbols (bit order) */
};
extern struct gmr1_pi4cxpsk_modulation gmr1_pi2cbpsk;
extern struct gmr1_pi4cxpsk_modulation gmr1_pi4cbpsk;
extern struct gmr1_pi4cxpsk_modulation gmr1_pi4cqpsk;
/*! \brief pi4-CxPSK Synchronization sequence segment description */
struct gmr1_pi4cxpsk_sync {
int pos; /*!< \brief Sync Position */
int len; /*!< \brief Sync Length */
uint8_t syms[GMR1_MAX_SYNC_SYMS]; /*!< \brief Sync Symbols */
struct osmo_cxvec *_ref; /*!< \brief Ref signal */
};
/*! \brief pi4-CxPSK Data segment description */
struct gmr1_pi4cxpsk_data {
int pos; /*!< \brief Data chunk position */
int len; /*!< \brief Data chunk length */
};
/*! \brief pi4-CxPSK Burst format description */
struct gmr1_pi4cxpsk_burst {
/*! \brief Modulation scheme */
struct gmr1_pi4cxpsk_modulation *mod;
/*! \brief Beginning guard period */
int guard_pre;
/*! \brief End guard period */
int guard_post;
/*! \brief Total len with guard */
int len;
/*! \brief Number of encoded bits */
int ebits;
/*! \brief Sync sequences */
struct gmr1_pi4cxpsk_sync *sync[GMR1_MAX_SYNC];
/*! \brief Data chunks */
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__ */
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