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134 lines
4.9 KiB
C
134 lines
4.9 KiB
C
/**
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* Copyright 2013-2020 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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#ifndef SRSLTE_CSI_RS_H_
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#define SRSLTE_CSI_RS_H_
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#include "srslte/config.h"
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#include "srslte/phy/common/phy_common_nr.h"
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#include <complex.h>
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#include <stdbool.h>
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#include <stdint.h>
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#define SRSLTE_CSI_RS_NOF_FREQ_DOMAIN_ALLOC_ROW1 4
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#define SRSLTE_CSI_RS_NOF_FREQ_DOMAIN_ALLOC_ROW2 12
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#define SRSLTE_CSI_RS_NOF_FREQ_DOMAIN_ALLOC_ROW4 3
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#define SRSLTE_CSI_RS_NOF_FREQ_DOMAIN_ALLOC_OTHER 6
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#define SRSLTE_CSI_RS_NOF_FREQ_DOMAIN_ALLOC_MAX 12
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typedef enum SRSLTE_API {
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srslte_csi_rs_resource_mapping_row_1 = 0,
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srslte_csi_rs_resource_mapping_row_2,
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srslte_csi_rs_resource_mapping_row_4,
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srslte_csi_rs_resource_mapping_row_other,
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} srslte_csi_rs_resource_mapping_row_t;
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typedef enum SRSLTE_API {
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srslte_csi_rs_resource_mapping_density_three = 0,
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srslte_csi_rs_resource_mapping_density_dot5_even,
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srslte_csi_rs_resource_mapping_density_dot5_odd,
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srslte_csi_rs_resource_mapping_density_one,
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srslte_csi_rs_resource_mapping_density_spare
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} srslte_csi_rs_density_t;
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typedef enum SRSLTE_API {
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srslte_csi_rs_cdm_nocdm = 0,
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srslte_csi_rs_cdm_fd_cdm2,
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srslte_csi_rs_cdm_cdm4_fd2_td2,
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srslte_csi_rs_cdm_cdm8_fd2_td4
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} srslte_csi_rs_cdm_t;
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/**
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* @brief Contains CSI-FrequencyOccupation flattened configuration
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*/
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typedef struct SRSLTE_API {
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uint32_t start_rb; ///< PRB where this CSI resource starts in relation to common resource block #0 (CRB#0) on the
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///< common resource block grid. Only multiples of 4 are allowed (0, 4, ..., 274)
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uint32_t nof_rb; ///< Number of PRBs across which this CSI resource spans. Only multiples of 4 are allowed. The
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///< smallest configurable number is the minimum of 24 and the width of the associated BWP. If the
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///< configured value is larger than the width of the corresponding BWP, the UE shall assume that the
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///< actual CSI-RS bandwidth is equal to the width of the BWP.
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} srslte_csi_rs_freq_occupation_t;
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/**
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* @brief Contains CSI-ResourcePeriodicityAndOffset flattened configuration
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*/
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typedef struct SRSLTE_API {
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uint32_t period; // 4,5,8,10,16,20,32,40,64,80,160,320,640
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uint32_t offset; // 0..period-1
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} srslte_csi_rs_period_and_offset_t;
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/**
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* @brief Contains CSI-RS-ResourceMapping flattened configuration
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*/
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typedef struct SRSLTE_API {
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srslte_csi_rs_resource_mapping_row_t row;
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bool frequency_domain_alloc[SRSLTE_CSI_RS_NOF_FREQ_DOMAIN_ALLOC_MAX];
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uint32_t ports; // 1, 2, 4, 8, 12, 16, 24, 32
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uint32_t first_symbol_idx; // 0..13
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uint32_t first_symbol_idx2; // 2..12 (set to 0 for disabled)
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srslte_csi_rs_cdm_t cdm;
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srslte_csi_rs_density_t density;
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srslte_csi_rs_freq_occupation_t freq_band;
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} srslte_csi_rs_resource_mapping_t;
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/**
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* @brief Contains NZP-CSI-RS-Resource flattened configuration
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*/
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typedef struct SRSLTE_API {
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srslte_csi_rs_resource_mapping_t resource_mapping;
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float power_control_offset; // -8..15 dB
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float power_control_offset_ss; // -3, 0, 3, 6 dB
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uint32_t scrambling_id; // 0..1023
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srslte_csi_rs_period_and_offset_t periodicity;
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} srslte_csi_rs_nzp_resource_t;
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SRSLTE_API int srslte_csi_rs_nzp_put(const srslte_carrier_nr_t* carrier,
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const srslte_dl_slot_cfg_t* slot_cfg,
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const srslte_csi_rs_nzp_resource_t* resource,
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cf_t* grid);
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typedef struct SRSLTE_API {
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float rsrp;
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float rsrp_dB;
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float epre;
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float epre_dB;
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float n0;
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float n0_dB;
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float snr_dB;
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uint32_t nof_re;
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} srslte_csi_rs_measure_t;
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SRSLTE_API int srslte_csi_rs_nzp_measure(const srslte_carrier_nr_t* carrier,
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const srslte_dl_slot_cfg_t* slot_cfg,
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const srslte_csi_rs_nzp_resource_t* resource,
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const cf_t* grid,
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srslte_csi_rs_measure_t* measure);
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SRSLTE_API uint32_t srslte_csi_rs_measure_info(const srslte_csi_rs_measure_t* measure, char* str, uint32_t str_len);
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#endif // SRSLTE_CSI_RS_H_
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