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159 lines
5.3 KiB
C
159 lines
5.3 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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/**********************************************************************************************
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* File: chest_dl.h
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*
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* Description: 3GPP LTE Downlink channel estimator and equalizer.
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* Estimates the channel in the resource elements transmitting references and
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* interpolates for the rest of the resource grid.
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* The equalizer uses the channel estimates to produce an estimation of the
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* transmitted symbol.
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* This object depends on the srslte_refsignal_t object for creating the LTE
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* CSR signal.
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*
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* Reference:
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*********************************************************************************************/
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#ifndef SRSLTE_CHEST_DL_H
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#define SRSLTE_CHEST_DL_H
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#include <stdio.h>
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#include "srslte/config.h"
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#include "srslte/phy/ch_estimation/chest_common.h"
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#include "srslte/phy/ch_estimation/refsignal_dl.h"
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#include "srslte/phy/common/phy_common.h"
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#include "srslte/phy/resampling/interp.h"
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#include "srslte/phy/sync/pss.h"
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typedef struct SRSLTE_API {
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cf_t* ce[SRSLTE_MAX_PORTS][SRSLTE_MAX_PORTS];
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uint32_t nof_re;
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float noise_estimate;
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float noise_estimate_dbm;
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float snr_db;
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float snr_ant_port_db[SRSLTE_MAX_PORTS][SRSLTE_MAX_PORTS];
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float rsrp;
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float rsrp_dbm;
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float rsrp_neigh;
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float rsrp_port_dbm[SRSLTE_MAX_PORTS];
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float rsrp_ant_port_dbm[SRSLTE_MAX_PORTS][SRSLTE_MAX_PORTS];
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float rsrq;
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float rsrq_db;
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float rsrq_ant_port_db[SRSLTE_MAX_PORTS][SRSLTE_MAX_PORTS];
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float rssi_dbm;
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float cfo;
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float sync_error;
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} srslte_chest_dl_res_t;
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typedef enum SRSLTE_API {
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SRSLTE_NOISE_ALG_REFS = 0,
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SRSLTE_NOISE_ALG_PSS,
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SRSLTE_NOISE_ALG_EMPTY,
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} srslte_chest_dl_noise_alg_t;
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typedef struct SRSLTE_API {
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srslte_cell_t cell;
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uint32_t nof_rx_antennas;
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srslte_refsignal_t csr_refs;
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srslte_refsignal_t** mbsfn_refs;
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cf_t* pilot_estimates;
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cf_t* pilot_estimates_average;
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cf_t* pilot_recv_signal;
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cf_t* tmp_noise;
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cf_t* tmp_cfo_estimate;
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#ifdef FREQ_SEL_SNR
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float snr_vector[12000];
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float pilot_power[12000];
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#endif
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srslte_interp_linsrslte_vec_t srslte_interp_linvec;
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srslte_interp_lin_t srslte_interp_lin;
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srslte_interp_lin_t srslte_interp_lin_3;
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srslte_interp_lin_t srslte_interp_lin_mbsfn;
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float rssi[SRSLTE_MAX_PORTS][SRSLTE_MAX_PORTS];
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float rsrp[SRSLTE_MAX_PORTS][SRSLTE_MAX_PORTS];
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float rsrp_corr[SRSLTE_MAX_PORTS][SRSLTE_MAX_PORTS];
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float noise_estimate[SRSLTE_MAX_PORTS][SRSLTE_MAX_PORTS];
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float sync_err[SRSLTE_MAX_PORTS][SRSLTE_MAX_PORTS];
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float cfo;
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/* Use PSS for noise estimation in LS linear interpolation mode */
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cf_t pss_signal[SRSLTE_PSS_LEN];
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cf_t tmp_pss[SRSLTE_PSS_LEN];
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cf_t tmp_pss_noisy[SRSLTE_PSS_LEN];
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} srslte_chest_dl_t;
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typedef struct SRSLTE_API {
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srslte_chest_dl_noise_alg_t noise_alg;
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srslte_chest_filter_t filter_type;
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float filter_coef[2];
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uint16_t mbsfn_area_id;
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bool interpolate_subframe;
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bool rsrp_neighbour;
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bool cfo_estimate_enable;
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uint32_t cfo_estimate_sf_mask;
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bool sync_error_enable;
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} srslte_chest_dl_cfg_t;
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SRSLTE_API int srslte_chest_dl_init(srslte_chest_dl_t* q, uint32_t max_prb, uint32_t nof_rx_antennas);
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SRSLTE_API void srslte_chest_dl_free(srslte_chest_dl_t* q);
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SRSLTE_API int srslte_chest_dl_res_init(srslte_chest_dl_res_t* q, uint32_t max_prb);
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SRSLTE_API void srslte_chest_dl_res_set_identity(srslte_chest_dl_res_t* q);
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SRSLTE_API void srslte_chest_dl_res_set_ones(srslte_chest_dl_res_t* q);
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SRSLTE_API void srslte_chest_dl_res_free(srslte_chest_dl_res_t* q);
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/* These functions change the internal object state */
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SRSLTE_API int srslte_chest_dl_set_mbsfn_area_id(srslte_chest_dl_t* q, uint16_t mbsfn_area_id);
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SRSLTE_API int srslte_chest_dl_set_cell(srslte_chest_dl_t* q, srslte_cell_t cell);
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/* These functions do not change the internal state */
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SRSLTE_API int srslte_chest_dl_estimate(srslte_chest_dl_t* q,
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srslte_dl_sf_cfg_t* sf,
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cf_t* input[SRSLTE_MAX_PORTS],
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srslte_chest_dl_res_t* res);
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SRSLTE_API int srslte_chest_dl_estimate_cfg(srslte_chest_dl_t* q,
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srslte_dl_sf_cfg_t* sf,
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srslte_chest_dl_cfg_t* cfg,
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cf_t* input[SRSLTE_MAX_PORTS],
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srslte_chest_dl_res_t* res);
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#endif // SRSLTE_CHEST_DL_H
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