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126 lines
4.5 KiB
C
126 lines
4.5 KiB
C
/**
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* Copyright 2013-2023 Software Radio Systems Limited
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*
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* This file is part of srsRAN.
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*
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* srsRAN 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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* srsRAN 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: sync_nbiot.h
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*
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* Description: Time and frequency synchronization using the NPSS and NSSS signals.
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*
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* The object is designed to work with signals sampled at 1.92 Mhz
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* centered at the carrier frequency. Thus, downsampling is required
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* if the signal is sampled at higher frequencies.
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*
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* Correlation peak is detected comparing the maximum at the output
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* of the correlator with a threshold.
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*
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* Reference: 3GPP TS 36.211 version 13.2.0 Release 13
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*****************************************************************************/
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#ifndef SRSRAN_SYNC_NBIOT_H
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#define SRSRAN_SYNC_NBIOT_H
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#include <math.h>
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#include <stdbool.h>
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#include "srsran/config.h"
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#include "srsran/phy/sync/npss.h"
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#include "srsran/phy/sync/nsss.h"
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#include "srsran/phy/sync/sync.h"
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#include "srsran/phy/ue/ue_sync.h"
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#define MAX_NUM_CFO_CANDITATES 50
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typedef struct SRSRAN_API {
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srsran_npss_synch_t npss;
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srsran_nsss_synch_t nsss;
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srsran_cp_synch_t cp_synch;
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uint32_t n_id_ncell;
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float threshold;
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float peak_value;
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uint32_t fft_size;
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uint32_t frame_size;
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uint32_t max_frame_size;
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uint32_t max_offset;
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bool enable_cfo_estimation;
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bool enable_cfo_cand_test;
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float cfo_cand[MAX_NUM_CFO_CANDITATES];
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int cfo_num_cand;
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int cfo_cand_idx;
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float mean_cfo;
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float current_cfo_tol;
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cf_t* shift_buffer;
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cf_t* cfo_output;
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int cfo_i;
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bool find_cfo_i;
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bool find_cfo_i_initiated;
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float cfo_ema_alpha;
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uint32_t nof_symbols;
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uint32_t cp_len;
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srsran_cfo_t cfocorr;
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srsran_cp_t cp;
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} srsran_sync_nbiot_t;
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SRSRAN_API int
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srsran_sync_nbiot_init(srsran_sync_nbiot_t* q, uint32_t frame_size, uint32_t max_offset, uint32_t fft_size);
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SRSRAN_API void srsran_sync_nbiot_free(srsran_sync_nbiot_t* q);
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SRSRAN_API int
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srsran_sync_nbiot_resize(srsran_sync_nbiot_t* q, uint32_t frame_size, uint32_t max_offset, uint32_t fft_size);
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SRSRAN_API srsran_sync_find_ret_t srsran_sync_nbiot_find(srsran_sync_nbiot_t* q,
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cf_t* input,
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uint32_t find_offset,
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uint32_t* peak_position);
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SRSRAN_API float cfo_estimate_nbiot(srsran_sync_nbiot_t* q, cf_t* input);
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SRSRAN_API void srsran_sync_nbiot_set_threshold(srsran_sync_nbiot_t* q, float threshold);
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SRSRAN_API void srsran_sync_nbiot_set_cfo_enable(srsran_sync_nbiot_t* q, bool enable);
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SRSRAN_API void srsran_sync_nbiot_set_cfo_cand_test_enable(srsran_sync_nbiot_t* q, bool enable);
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SRSRAN_API int srsran_sync_nbiot_set_cfo_cand(srsran_sync_nbiot_t* q, const float* cand, const int num);
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SRSRAN_API void srsran_sync_nbiot_set_cfo_tol(srsran_sync_nbiot_t* q, float tol);
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SRSRAN_API void srsran_sync_nbiot_set_cfo_ema_alpha(srsran_sync_nbiot_t* q, float alpha);
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SRSRAN_API void srsran_sync_nbiot_set_npss_ema_alpha(srsran_sync_nbiot_t* q, float alpha);
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SRSRAN_API int srsran_sync_nbiot_find_cell_id(srsran_sync_nbiot_t* q, cf_t* input);
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SRSRAN_API int srsran_sync_nbiot_get_cell_id(srsran_sync_nbiot_t* q);
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SRSRAN_API float srsran_sync_nbiot_get_cfo(srsran_sync_nbiot_t* q);
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SRSRAN_API void srsran_sync_nbiot_set_cfo(srsran_sync_nbiot_t* q, float cfo);
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SRSRAN_API bool srsran_sync_nbiot_nsss_detected(srsran_sync_nbiot_t* q);
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SRSRAN_API float srsran_sync_nbiot_get_peak_value(srsran_sync_nbiot_t* q);
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SRSRAN_API void srsran_sync_nbiot_reset(srsran_sync_nbiot_t* q);
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#endif // SRSRAN_SYNC_NBIOT_H
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