/** * * \section COPYRIGHT * * Copyright 2013-2021 Software Radio Systems Limited * * By using this file, you agree to the terms and conditions set * forth in the LICENSE file which can be found at the top level of * the distribution. * */ /****************************************************************************** * 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 SRSRAN_NSSS_H #define SRSRAN_NSSS_H #include #include #include #include "srsran/config.h" #include "srsran/phy/common/phy_common.h" #include "srsran/phy/dft/dft.h" #include "srsran/phy/utils/convolution.h" #define SRSRAN_NSSS_NSYMB 11 #define SRSRAN_NSSS_NSC 12 #define SRSRAN_NSSS_LEN (SRSRAN_NSSS_NSYMB * SRSRAN_NSSS_NSC) #define SRSRAN_NSSS_NUM_SEQ 4 #define SRSRAN_NSSS_TOT_LEN (SRSRAN_NSSS_NUM_SEQ * SRSRAN_NSSS_LEN) #define SRSRAN_NSSS_CORR_FILTER_LEN 1508 #define SRSRAN_NSSS_CORR_OFFSET 412 #define SRSRAN_NSSS_PERIOD 2 #define SRSRAN_NSSS_NUM_SF_DETECT (SRSRAN_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[SRSRAN_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 SRSRAN_API { uint32_t input_size; uint32_t subframe_sz; uint32_t fft_size, max_fft_size; srsran_conv_fft_cc_t conv_fft; cf_t* nsss_signal_time[SRSRAN_NUM_PCI]; cf_t* tmp_input; cf_t* conv_output; float* conv_output_abs; float peak_values[SRSRAN_NUM_PCI]; float corr_peak_threshold; } srsran_nsss_synch_t; SRSRAN_API int srsran_nsss_synch_init(srsran_nsss_synch_t* q, uint32_t input_size, uint32_t fft_size); SRSRAN_API void srsran_nsss_synch_free(srsran_nsss_synch_t* q); SRSRAN_API int srsran_nsss_synch_resize(srsran_nsss_synch_t* q, uint32_t fft_size); SRSRAN_API int srsran_nsss_sync_find(srsran_nsss_synch_t* q, cf_t* input, float* corr_peak_value, uint32_t* cell_id, uint32_t* sfn_partial); void srsran_nsss_sync_find_pci(srsran_nsss_synch_t* q, cf_t* input, uint32_t cell_id); SRSRAN_API int srsran_nsss_corr_init(srsran_nsss_synch_t* q); SRSRAN_API void srsran_nsss_generate(cf_t* signal, uint32_t cell_id); SRSRAN_API void srsran_nsss_put_subframe(srsran_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 // SRSRAN_NSSS_H