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109 lines
3.8 KiB
C
109 lines
3.8 KiB
C
/*
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* Copyright 2013-2019 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_ul.h
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*
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* Description: 3GPP LTE Uplink 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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*
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* Reference:
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*********************************************************************************************/
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#ifndef SRSLTE_CHEST_UL_H
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#define SRSLTE_CHEST_UL_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_ul.h"
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#include "srslte/phy/common/phy_common.h"
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#include "srslte/phy/phch/pucch_cfg.h"
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#include "srslte/phy/phch/pusch_cfg.h"
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#include "srslte/phy/resampling/interp.h"
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typedef struct SRSLTE_API {
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cf_t* ce;
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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;
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float snr_db;
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float cfo;
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} srslte_chest_ul_res_t;
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typedef struct {
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srslte_cell_t cell;
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srslte_refsignal_ul_t dmrs_signal;
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srslte_refsignal_ul_dmrs_pregen_t dmrs_pregen;
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bool dmrs_signal_configured;
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cf_t* pilot_estimates;
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cf_t* pilot_estimates_tmp[4];
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cf_t* pilot_recv_signal;
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cf_t* pilot_known_signal;
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cf_t* tmp_noise;
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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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uint32_t smooth_filter_len;
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float smooth_filter[SRSLTE_CHEST_MAX_SMOOTH_FIL_LEN];
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srslte_interp_linsrslte_vec_t srslte_interp_linvec;
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} srslte_chest_ul_t;
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SRSLTE_API int srslte_chest_ul_init(srslte_chest_ul_t* q, uint32_t max_prb);
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SRSLTE_API void srslte_chest_ul_free(srslte_chest_ul_t* q);
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SRSLTE_API int srslte_chest_ul_res_init(srslte_chest_ul_res_t* q, uint32_t max_prb);
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SRSLTE_API void srslte_chest_ul_res_set_identity(srslte_chest_ul_res_t* q);
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SRSLTE_API void srslte_chest_ul_res_free(srslte_chest_ul_res_t* q);
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SRSLTE_API int srslte_chest_ul_set_cell(srslte_chest_ul_t* q, srslte_cell_t cell);
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SRSLTE_API void srslte_chest_ul_pregen(srslte_chest_ul_t* q, srslte_refsignal_dmrs_pusch_cfg_t* cfg);
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SRSLTE_API int srslte_chest_ul_estimate_pusch(srslte_chest_ul_t* q,
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srslte_ul_sf_cfg_t* sf,
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srslte_pusch_cfg_t* cfg,
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cf_t* input,
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srslte_chest_ul_res_t* res);
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SRSLTE_API int srslte_chest_ul_estimate_pucch(srslte_chest_ul_t* q,
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srslte_ul_sf_cfg_t* sf,
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srslte_pucch_cfg_t* cfg,
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cf_t* input,
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srslte_chest_ul_res_t* res);
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#endif // SRSLTE_CHEST_UL_H
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