/* * Copyright 2013-2019 Software Radio Systems Limited * * This file is part of srsLTE. * * srsLTE is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License as * published by the Free Software Foundation, either version 3 of * the License, or (at your option) any later version. * * srsLTE is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Affero General Public License for more details. * * A copy of the GNU Affero General Public License can be found in * the LICENSE file in the top-level directory of this distribution * and at http://www.gnu.org/licenses/. * */ /****************************************************************************** * File: nsss.h * * Description: Narrowband secondary synchronization signal (NSSS) * generation and detection. * * * Reference: 3GPP TS 36.211 version 13.2.0 Release 13 Sec. 10.2.7.2 *****************************************************************************/ #ifndef SRSLTE_NSSS_H #define SRSLTE_NSSS_H #include #include #include #include "srslte/config.h" #include "srslte/phy/common/phy_common.h" #include "srslte/phy/dft/dft.h" #include "srslte/phy/utils/convolution.h" #define SRSLTE_NSSS_NSYMB 11 #define SRSLTE_NSSS_NSC 12 #define SRSLTE_NSSS_LEN (SRSLTE_NSSS_NSYMB * SRSLTE_NSSS_NSC) #define SRSLTE_NSSS_NUM_SEQ 4 #define SRSLTE_NSSS_TOT_LEN (SRSLTE_NSSS_NUM_SEQ * SRSLTE_NSSS_LEN) #define SRSLTE_NSSS_CORR_FILTER_LEN 1508 #define SRSLTE_NSSS_CORR_OFFSET 412 #define SRSLTE_NSSS_PERIOD 2 #define SRSLTE_NSSS_NUM_SF_DETECT (SRSLTE_NSSS_PERIOD) // b_q_m table from 3GPP TS 36.211 v13.2.0 table 10.2.7.2.1-1 static const int b_q_m[SRSLTE_NSSS_NUM_SEQ][128] = { {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, 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, 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, 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}, {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, 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, 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, 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}, {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, -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, 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, -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}, {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, -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, -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, 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}}; /* Low-level API */ typedef struct SRSLTE_API { uint32_t input_size; uint32_t subframe_sz; uint32_t fft_size, max_fft_size; srslte_conv_fft_cc_t conv_fft; cf_t* nsss_signal_time[SRSLTE_NUM_PCI]; cf_t* tmp_input; cf_t* conv_output; float* conv_output_abs; float peak_values[SRSLTE_NUM_PCI]; float corr_peak_threshold; } srslte_nsss_synch_t; SRSLTE_API int srslte_nsss_synch_init(srslte_nsss_synch_t* q, uint32_t input_size, uint32_t fft_size); SRSLTE_API void srslte_nsss_synch_free(srslte_nsss_synch_t* q); SRSLTE_API int srslte_nsss_synch_resize(srslte_nsss_synch_t* q, uint32_t fft_size); SRSLTE_API int srslte_nsss_sync_find(srslte_nsss_synch_t* q, cf_t* input, float* corr_peak_value, uint32_t* cell_id, uint32_t* sfn_partial); void srslte_nsss_sync_find_pci(srslte_nsss_synch_t* q, cf_t* input, uint32_t cell_id); SRSLTE_API int srslte_nsss_corr_init(srslte_nsss_synch_t* q); SRSLTE_API void srslte_nsss_generate(cf_t* signal, uint32_t cell_id); SRSLTE_API void srslte_nsss_put_subframe(srslte_nsss_synch_t* q, cf_t* nsss, cf_t* subframe, const int nf, const uint32_t nof_prb, const uint32_t nbiot_prb_offset); #endif // SRSLTE_NSSS_H