mirror of https://github.com/PentHertz/srsLTE.git
72 lines
2.7 KiB
C
72 lines
2.7 KiB
C
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2021 Software Radio Systems Limited
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*
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* By using this file, you agree to the terms and conditions set
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* forth in the LICENSE file which can be found at the top level of
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* the distribution.
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*
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*/
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#ifndef SRSRAN_DMRS_PBCH_H
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#define SRSRAN_DMRS_PBCH_H
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#include "srsran/phy/common/phy_common_nr.h"
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/**
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* @brief Describes the DeModulation Reference Signals (DMRS) for NR PBCH configuration
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*/
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typedef struct SRSRAN_API {
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uint32_t N_id; ///< Physical cell identifier
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uint32_t n_hf; ///< Number of half radio frame, 0 or 1
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uint32_t ssb_idx; ///< SSB candidate index, up to 3 LSB are significant
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uint32_t L_max; ///< Number of SSB opportunities in half radio frame
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float beta; ///< Power allocation specified in TS 38.213
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srsran_subcarrier_spacing_t scs; ///< SSB configured subcarrier spacing
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} srsran_dmrs_pbch_cfg_t;
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/**
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* @brief Describes an NR PBCH DMRS based measurement
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*/
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typedef struct SRSRAN_API {
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float corr; ///< Normalised correlation
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float epre; ///< Linear energy per resource element
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float rsrp; ///< Linear RSRP
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float cfo_hz; ///< CFO in Hz
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float avg_delay_us; ///< Average delay in us
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} srsran_dmrs_pbch_meas_t;
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/**
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* @brief Put NR PBCH DMRS in the SSB resource grid
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* @param cfg PBCH DMRS configuration
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* @param[out] ssb_grid SSB resource grid
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* @return SRSRAN_SUCCESS if the inputs and configuration are valid, SRSRAN_ERROR code otherwise
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*/
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SRSRAN_API int srsran_dmrs_pbch_put(const srsran_dmrs_pbch_cfg_t* cfg, cf_t ssb_grid[SRSRAN_SSB_NOF_RE]);
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/**
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* @brief Measures NR PBCH DMRS
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* @param cfg PBCH DMRS configuration
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* @param ssb_grid SSB resource grid
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* @param[out] meas Measurement
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* @return SRSRAN_SUCCESS if the inputs and configuration are valid, SRSRAN_ERROR code otherwise
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*/
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SRSRAN_API int srsran_dmrs_pbch_measure(const srsran_dmrs_pbch_cfg_t* cfg,
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const cf_t ssb_grid[SRSRAN_SSB_NOF_RE],
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srsran_dmrs_pbch_meas_t* meas);
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/**
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* @brief Estimates NR PBCH DMRS
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* @param cfg PBCH DMRS configuration
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* @param ssb_grid Demodulated SSB resource grid
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* @param[out] ce Estimated channel
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* @return SRSRAN_SUCCESS if the inputs and configuration are valid, SRSRAN_ERROR code otherwise
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*/
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SRSRAN_API int srsran_dmrs_pbch_estimate(const srsran_dmrs_pbch_cfg_t* cfg,
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const cf_t ssb_grid[SRSRAN_SSB_NOF_RE],
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cf_t ce[SRSRAN_SSB_NOF_RE]);
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#endif // SRSRAN_DMRS_PBCH_H
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