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74 lines
2.6 KiB
C
74 lines
2.6 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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#ifndef SRSRAN_SSS_NR_H
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#define SRSRAN_SSS_NR_H
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#include "srsran/config.h"
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#include "srsran/phy/common/phy_common_nr.h"
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#include <inttypes.h>
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/**
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* @brief NR SSS sequence length in frequency domain
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*/
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#define SRSRAN_SSS_NR_LEN 127
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/**
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* @brief NR SSS Symbol number
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*/
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#define SRSRAN_SSS_NR_SYMBOL_IDX 2
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/**
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* @brief Put NR SSS sequence in the SSB grid
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* @remark Described in TS 38.211 section 7.4.2.3 Secondary synchronization signal
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* @param ssb_grid SSB resource grid
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* @param N_id_1 Physical cell ID 1
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* @param N_id_2 Physical cell ID 2
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* @param beta SSS power allocation
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* @return SRSRAN_SUCCESS if the parameters are valid, SRSRAN_ERROR code otherwise
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*/
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SRSRAN_API int srsran_sss_nr_put(cf_t ssb_grid[SRSRAN_SSB_NOF_RE], uint32_t N_id_1, uint32_t N_id_2, float beta);
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/**
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* @brief Extracts the NR SSS Least Square Estimates (LSE) from the SSB grid
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* @param ssb_grid received SSB resource grid
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* @param N_id_1 Physical cell ID 1
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* @param N_id_2 Physical cell ID 2
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* @param lse Provides LSE pointer
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* @return SRSRAN_SUCCESS if the parameters are valid, SRSRAN_ERROR code otherwise
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*/
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SRSRAN_API int
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srsran_sss_nr_extract_lse(const cf_t* ssb_grid, uint32_t N_id_1, uint32_t N_id_2, cf_t lse[SRSRAN_SSS_NR_LEN]);
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/**
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* @brief Find the best SSS sequence given the N_id_2 and the SSB resource grid
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* @attention Assumes the SSB is synchronized and the average delay is pre-compensated
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* @param ssb_grid The SSB resource grid to search
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* @param N_id_2 Fix N_id_2 to search, it reduces the search space 1/3
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* @param norm_corr Normalised correlation of the best found sequence
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* @param found_N_id_1 The N_id_1 of the best sequence
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* @return SRSRAN_SUCCESS if the parameters are valid, SRSRAN_ERROR code otherwise
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*/
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SRSRAN_API int
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srsran_sss_nr_find(const cf_t ssb_grid[SRSRAN_SSB_NOF_RE], uint32_t N_id_2, float* norm_corr, uint32_t* found_N_id_1);
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#endif // SRSRAN_SSS_NR_H
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