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129 lines
4.4 KiB
C
129 lines
4.4 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: sss.h
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*
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* Description: Secondary synchronization signal (SSS) generation and detection.
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*
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*
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* Reference: 3GPP TS 36.211 version 10.0.0 Release 10 Sec. 6.11.2
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*****************************************************************************/
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#ifndef SRSLTE_SSS_H
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#define SRSLTE_SSS_H
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#include <stdbool.h>
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#include <stdint.h>
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#include "srslte/config.h"
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#include "srslte/phy/common/phy_common.h"
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#include "srslte/phy/dft/dft.h"
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#define SRSLTE_SSS_N 31
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#define SRSLTE_SSS_LEN 2 * SRSLTE_SSS_N
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typedef struct SRSLTE_API {
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int z1[SRSLTE_SSS_N][SRSLTE_SSS_N];
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int c[2][SRSLTE_SSS_N];
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int s[SRSLTE_SSS_N][SRSLTE_SSS_N];
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} srslte_sss_tables_t;
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/* Allocate 32 complex to make it multiple of 32-byte AVX instructions alignment requirement.
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* Should use srslte_vec_malloc() to make it platform agnostic.
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*/
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typedef struct SRSLTE_API {
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float z1[SRSLTE_SSS_N][SRSLTE_SSS_N];
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float c[2][SRSLTE_SSS_N];
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float s[SRSLTE_SSS_N][SRSLTE_SSS_N];
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float sd[SRSLTE_SSS_N][SRSLTE_SSS_N - 1];
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} srslte_sss_fc_tables_t;
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/* Low-level API */
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typedef struct SRSLTE_API {
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srslte_dft_plan_t dftp_input;
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uint32_t fft_size;
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uint32_t max_fft_size;
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float corr_peak_threshold;
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uint32_t symbol_sz;
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uint32_t subframe_sz;
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uint32_t N_id_2;
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uint32_t N_id_1_table[30][30];
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srslte_sss_fc_tables_t fc_tables[3]; // one for each N_id_2
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float corr_output_m0[SRSLTE_SSS_N];
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float corr_output_m1[SRSLTE_SSS_N];
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} srslte_sss_t;
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/* Basic functionality */
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SRSLTE_API int srslte_sss_init(srslte_sss_t* q, uint32_t fft_size);
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SRSLTE_API int srslte_sss_resize(srslte_sss_t* q, uint32_t fft_size);
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SRSLTE_API void srslte_sss_free(srslte_sss_t* q);
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SRSLTE_API void srslte_sss_generate(float* signal0, float* signal5, uint32_t cell_id);
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SRSLTE_API void srslte_sss_put_slot(float* sss, cf_t* symbol, uint32_t nof_prb, srslte_cp_t cp);
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SRSLTE_API void srslte_sss_put_symbol(float* sss, cf_t* symbol, uint32_t nof_prb);
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SRSLTE_API int srslte_sss_set_N_id_2(srslte_sss_t* q, uint32_t N_id_2);
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SRSLTE_API int srslte_sss_m0m1_partial(srslte_sss_t* q,
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const cf_t* input,
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uint32_t M,
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cf_t ce[2 * SRSLTE_SSS_N],
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uint32_t* m0,
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float* m0_value,
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uint32_t* m1,
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float* m1_value);
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SRSLTE_API int srslte_sss_m0m1_diff_coh(srslte_sss_t* q,
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const cf_t* input,
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cf_t ce[2 * SRSLTE_SSS_N],
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uint32_t* m0,
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float* m0_value,
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uint32_t* m1,
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float* m1_value);
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SRSLTE_API int
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srslte_sss_m0m1_diff(srslte_sss_t* q, const cf_t* input, uint32_t* m0, float* m0_value, uint32_t* m1, float* m1_value);
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SRSLTE_API uint32_t srslte_sss_subframe(uint32_t m0, uint32_t m1);
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SRSLTE_API int srslte_sss_N_id_1(srslte_sss_t* q, uint32_t m0, uint32_t m1, float corr);
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SRSLTE_API int srslte_sss_frame(srslte_sss_t* q, cf_t* input, uint32_t* subframe_idx, uint32_t* N_id_1);
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SRSLTE_API void srslte_sss_set_threshold(srslte_sss_t* q, float threshold);
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SRSLTE_API void srslte_sss_set_symbol_sz(srslte_sss_t* q, uint32_t symbol_sz);
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SRSLTE_API void srslte_sss_set_subframe_sz(srslte_sss_t* q, uint32_t subframe_sz);
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#endif // SRSLTE_SSS_H
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