mirror of https://github.com/PentHertz/srsLTE.git
205 lines
7.1 KiB
C
205 lines
7.1 KiB
C
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2015 Software Radio Systems Limited
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*
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* \section LICENSE
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*
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* This file is part of the srsLTE library.
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*
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* srsLTE is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version.
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*
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* srsLTE is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* A copy of the GNU Affero General Public License can be found in
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* the LICENSE file in the top-level directory of this distribution
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* and at http://www.gnu.org/licenses/.
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*
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*/
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/******************************************************************************
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* File: ue_sync.h
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*
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* Description: This object automatically manages the cell synchronization
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* procedure.
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*
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* The main function is srslte_ue_sync_get_buffer(), which returns
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* a pointer to the aligned subframe of samples (before FFT). This
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* function should be called regularly, returning every 1 ms.
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* It reads from the USRP, aligns the samples to the subframe and
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* performs time/freq synch.
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*
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* It is also possible to read the signal from a file using the
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* init function srslte_ue_sync_init_file(). The sampling frequency
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* is derived from the number of PRB.
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*
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* The function returns 1 when the signal is correctly acquired and
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* the returned buffer is aligned with the subframe.
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*
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* Reference:
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*****************************************************************************/
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#ifndef UE_SYNC_
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#define UE_SYNC_
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#include <stdbool.h>
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#include "srslte/config.h"
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#include "srslte/phy/sync/sync.h"
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#include "srslte/phy/sync/cfo.h"
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#include "srslte/phy/agc/agc.h"
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#include "srslte/phy/ch_estimation/chest_dl.h"
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#include "srslte/phy/phch/pbch.h"
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#include "srslte/phy/dft/ofdm.h"
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#include "srslte/phy/common/timestamp.h"
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#include "srslte/phy/io/filesource.h"
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typedef enum SRSLTE_API { SF_FIND, SF_TRACK} srslte_ue_sync_state_t;
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//#define MEASURE_EXEC_TIME
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typedef struct SRSLTE_API {
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srslte_sync_t sfind;
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srslte_sync_t strack;
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srslte_agc_t agc;
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bool do_agc;
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uint32_t agc_period;
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int decimate;
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void *stream;
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void *stream_single;
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int (*recv_callback)(void*, cf_t*[SRSLTE_MAX_PORTS], uint32_t, srslte_timestamp_t*);
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int (*recv_callback_single)(void*, void*, uint32_t, srslte_timestamp_t*);
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srslte_timestamp_t last_timestamp;
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uint32_t nof_rx_antennas;
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srslte_filesource_t file_source;
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bool file_mode;
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float file_cfo;
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srslte_cfo_t file_cfo_correct;
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srslte_ue_sync_state_t state;
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uint32_t frame_len;
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uint32_t fft_size;
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uint32_t nof_recv_sf; // Number of subframes received each call to srslte_ue_sync_get_buffer
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uint32_t nof_avg_find_frames;
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uint32_t frame_find_cnt;
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uint32_t sf_len;
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/* These count half frames (5ms) */
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uint64_t frame_ok_cnt;
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uint32_t frame_no_cnt;
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uint32_t frame_total_cnt;
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/* this is the system frame number (SFN) */
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uint32_t frame_number;
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srslte_cell_t cell;
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uint32_t sf_idx;
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bool decode_sss_on_track;
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bool correct_cfo;
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uint32_t peak_idx;
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int next_rf_sample_offset;
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int last_sample_offset;
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float mean_sample_offset;
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float mean_sfo;
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uint32_t sample_offset_correct_period;
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float sfo_ema;
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#ifdef MEASURE_EXEC_TIME
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float mean_exec_time;
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#endif
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} srslte_ue_sync_t;
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SRSLTE_API int srslte_ue_sync_init(srslte_ue_sync_t *q,
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srslte_cell_t cell,
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int (recv_callback)(void*, void*, uint32_t, srslte_timestamp_t*),
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void *stream_handler);
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SRSLTE_API int srslte_ue_sync_init_multi(srslte_ue_sync_t *q,
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srslte_cell_t cell,
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int (recv_callback)(void*, cf_t*[SRSLTE_MAX_PORTS], uint32_t, srslte_timestamp_t*),
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uint32_t nof_rx_antennas,
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void *stream_handler);
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SRSLTE_API int srslte_ue_sync_init_multi_decim(srslte_ue_sync_t *q,
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srslte_cell_t cell,
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int (recv_callback)(void*, cf_t*[SRSLTE_MAX_PORTS], uint32_t, srslte_timestamp_t*),
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uint32_t nof_rx_antennas,
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void *stream_handler,
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int decimate);
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SRSLTE_API int srslte_ue_sync_init_file(srslte_ue_sync_t *q,
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uint32_t nof_prb,
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char *file_name,
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int offset_time,
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float offset_freq);
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SRSLTE_API void srslte_ue_sync_free(srslte_ue_sync_t *q);
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SRSLTE_API int srslte_ue_sync_start_agc(srslte_ue_sync_t *q,
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double (set_gain_callback)(void*, double),
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float init_gain_value);
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SRSLTE_API uint32_t srslte_ue_sync_sf_len(srslte_ue_sync_t *q);
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SRSLTE_API void srslte_ue_sync_set_agc_period(srslte_ue_sync_t *q,
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uint32_t period);
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/* CAUTION: input_buffer MUST have space for 2 subframes */
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SRSLTE_API int srslte_ue_sync_zerocopy(srslte_ue_sync_t *q,
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cf_t *input_buffer);
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SRSLTE_API int srslte_ue_sync_zerocopy_multi(srslte_ue_sync_t *q,
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cf_t *input_buffer[SRSLTE_MAX_PORTS]);
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SRSLTE_API void srslte_ue_sync_set_cfo(srslte_ue_sync_t *q,
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float cfo);
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SRSLTE_API void srslte_ue_sync_cfo_i_detec_en(srslte_ue_sync_t *q,
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bool enable);
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SRSLTE_API void srslte_ue_sync_reset(srslte_ue_sync_t *q);
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SRSLTE_API void srslte_ue_sync_set_N_id_2(srslte_ue_sync_t *q,
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uint32_t N_id_2);
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SRSLTE_API void srslte_ue_sync_decode_sss_on_track(srslte_ue_sync_t *q,
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bool enabled);
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SRSLTE_API srslte_ue_sync_state_t srslte_ue_sync_get_state(srslte_ue_sync_t *q);
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SRSLTE_API uint32_t srslte_ue_sync_get_sfidx(srslte_ue_sync_t *q);
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SRSLTE_API float srslte_ue_sync_get_cfo(srslte_ue_sync_t *q);
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SRSLTE_API float srslte_ue_sync_get_sfo(srslte_ue_sync_t *q);
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SRSLTE_API int srslte_ue_sync_get_last_sample_offset(srslte_ue_sync_t *q);
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SRSLTE_API void srslte_ue_sync_set_sample_offset_correct_period(srslte_ue_sync_t *q,
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uint32_t nof_subframes);
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SRSLTE_API void srslte_ue_sync_get_last_timestamp(srslte_ue_sync_t *q,
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srslte_timestamp_t *timestamp);
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#endif // SYNC_FRAME_
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