mirror of https://github.com/PentHertz/srsLTE.git
116 lines
5.2 KiB
C
116 lines
5.2 KiB
C
/*
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* Copyright 2013-2019 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: nsss.h
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*
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* Description: Narrowband secondary synchronization signal (NSSS)
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* generation and detection.
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*
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*
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* Reference: 3GPP TS 36.211 version 13.2.0 Release 13 Sec. 10.2.7.2
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*****************************************************************************/
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#ifndef SRSLTE_NSSS_H
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#define SRSLTE_NSSS_H
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#include <stdbool.h>
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#include <stdint.h>
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#include <string.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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#include "srslte/phy/utils/convolution.h"
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#define SRSLTE_NSSS_NSYMB 11
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#define SRSLTE_NSSS_NSC 12
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#define SRSLTE_NSSS_LEN (SRSLTE_NSSS_NSYMB * SRSLTE_NSSS_NSC)
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#define SRSLTE_NSSS_NUM_SEQ 4
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#define SRSLTE_NSSS_TOT_LEN (SRSLTE_NSSS_NUM_SEQ * SRSLTE_NSSS_LEN)
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#define SRSLTE_NSSS_CORR_FILTER_LEN 1508
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#define SRSLTE_NSSS_CORR_OFFSET 412
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#define SRSLTE_NUM_PCI 504
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#define SRSLTE_NSSS_PERIOD 2
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#define SRSLTE_NSSS_NUM_SF_DETECT (SRSLTE_NSSS_PERIOD)
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// b_q_m table from 3GPP TS 36.211 v13.2.0 table 10.2.7.2.1-1
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static const int b_q_m[SRSLTE_NSSS_NUM_SEQ][128] = {
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{1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1},
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{1, -1, -1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, -1,
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1, -1, -1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, -1,
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1, -1, -1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, -1,
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1, -1, -1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, -1},
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{1, -1, -1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, 1, -1,
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-1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1,
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-1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1,
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-1, 1, -1, 1, 1, -1, 1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1,
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1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1},
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{1, -1, -1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, 1, -1,
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-1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1,
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-1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, 1, -1, -1, 1, -1, 1,
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1, -1, 1, -1, -1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, -1,
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-1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, -1}};
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/* Low-level API */
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typedef struct SRSLTE_API {
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uint32_t input_size;
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uint32_t subframe_sz;
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uint32_t fft_size, max_fft_size;
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srslte_conv_fft_cc_t conv_fft;
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cf_t* nsss_signal_time[SRSLTE_NUM_PCI];
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cf_t* tmp_input;
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cf_t* conv_output;
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float* conv_output_abs;
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float peak_values[SRSLTE_NUM_PCI];
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float corr_peak_threshold;
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} srslte_nsss_synch_t;
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SRSLTE_API int srslte_nsss_synch_init(srslte_nsss_synch_t* q, uint32_t input_size, uint32_t fft_size);
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SRSLTE_API void srslte_nsss_synch_free(srslte_nsss_synch_t* q);
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SRSLTE_API int srslte_nsss_synch_resize(srslte_nsss_synch_t* q, uint32_t fft_size);
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SRSLTE_API int srslte_nsss_sync_find(
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srslte_nsss_synch_t* q, cf_t* input, float* corr_peak_value, uint32_t* cell_id, uint32_t* sfn_partial);
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void srslte_nsss_sync_find_pci(srslte_nsss_synch_t* q, cf_t* input, uint32_t cell_id);
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SRSLTE_API int srslte_nsss_corr_init(srslte_nsss_synch_t* q);
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SRSLTE_API void srslte_nsss_generate(cf_t* signal, uint32_t cell_id);
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SRSLTE_API void srslte_nsss_put_subframe(srslte_nsss_synch_t* q,
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cf_t* nsss,
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cf_t* subframe,
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const int nf,
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const uint32_t nof_prb,
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const uint32_t nbiot_prb_offset);
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#endif // SRSLTE_NSSS_H
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