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80 lines
2.3 KiB
C
80 lines
2.3 KiB
C
/**
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* Copyright 2013-2021 Software Radio Systems Limited
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*
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* This file is part of srsLTE.
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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: ssss.h
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*
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* Description: Secondary sidelink synchronization signal (SSSS) generation and detection.
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*
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*
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* Reference: 3GPP TS 36.211 version 15.6.0 Release 15 Sec. 9.7.2
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*****************************************************************************/
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#ifndef SRSRAN_SSSS_H
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#define SRSRAN_SSSS_H
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#include <stdbool.h>
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#include <stdint.h>
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#include "srsran/phy/common/phy_common_sl.h"
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#include "srsran/phy/dft/dft.h"
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#define SRSRAN_SSSS_NOF_SEQ 336
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#define SRSRAN_SSSS_N 31
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#define SRSRAN_SSSS_LEN 2 * SRSRAN_SSSS_N
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typedef struct SRSRAN_API {
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float ssss_signal[SRSRAN_SSSS_NOF_SEQ][SRSRAN_SSSS_LEN]; // One sequence for each N_sl_id
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cf_t** ssss_sf_freq;
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cf_t* input_pad_freq;
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cf_t* input_pad_time;
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cf_t* dot_prod_output;
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cf_t* dot_prod_output_time;
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cf_t* shifted_output;
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float* shifted_output_abs;
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int32_t corr_peak_pos;
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float corr_peak_value;
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uint32_t N_sl_id;
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srsran_dft_plan_t plan_input;
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srsran_dft_plan_t plan_out;
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} srsran_ssss_t;
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SRSRAN_API int srsran_ssss_init(srsran_ssss_t* q, uint32_t nof_prb, srsran_cp_t cp, srsran_sl_tm_t tm);
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SRSRAN_API void srsran_ssss_generate(float* ssss_signal, uint32_t N_sl_id, srsran_sl_tm_t tm);
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SRSRAN_API void srsran_ssss_put_sf_buffer(float* ssss_signal, cf_t* sf_buffer, uint32_t nof_prb, srsran_cp_t cp);
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SRSRAN_API int srsran_ssss_find(srsran_ssss_t* q, cf_t* input, uint32_t nof_prb, uint32_t N_id_2, srsran_cp_t cp);
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SRSRAN_API void srsran_ssss_free(srsran_ssss_t* q);
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#endif |