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161 lines
5.8 KiB
C
161 lines
5.8 KiB
C
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2015 Software Radio Systems Limited
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*
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* \section LICENSE
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*
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* This file is part of the srsLTE library.
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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 CHEST_DL_
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#define CHEST_DL_
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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/resampling/interp.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/sync/pss.h"
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typedef enum {
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SRSLTE_NOISE_ALG_REFS,
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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 {
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srslte_cell_t cell;
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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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#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_interp_lin_t srslte_interp_lin;
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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 noise_estimate[SRSLTE_MAX_PORTS][SRSLTE_MAX_PORTS];
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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_noise_alg_t noise_alg;
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int last_nof_antennas;
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} srslte_chest_dl_t;
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SRSLTE_API int srslte_chest_dl_init(srslte_chest_dl_t *q,
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uint32_t max_prb);
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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_set_mbsfn_area_id(srslte_chest_dl_t *q,
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uint16_t mbsfn_area_id);
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SRSLTE_API int srslte_chest_dl_set_cell(srslte_chest_dl_t *q,
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srslte_cell_t cell);
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SRSLTE_API void srslte_chest_dl_set_smooth_filter(srslte_chest_dl_t *q,
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float *filter,
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uint32_t filter_len);
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SRSLTE_API void srslte_chest_dl_set_smooth_filter3_coeff(srslte_chest_dl_t* q,
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float w);
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SRSLTE_API void srslte_chest_dl_set_noise_alg(srslte_chest_dl_t *q,
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srslte_chest_dl_noise_alg_t noise_estimation_alg);
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SRSLTE_API int srslte_chest_dl_estimate_multi(srslte_chest_dl_t *q,
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cf_t *input[SRSLTE_MAX_PORTS],
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cf_t *ce[SRSLTE_MAX_PORTS][SRSLTE_MAX_PORTS],
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uint32_t sf_idx,
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uint32_t nof_rx_antennas);
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SRSLTE_API int srslte_chest_dl_estimate(srslte_chest_dl_t *q,
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cf_t *input,
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cf_t *ce[SRSLTE_MAX_PORTS],
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uint32_t sf_idx);
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SRSLTE_API int srslte_chest_dl_estimate_multi_mbsfn(srslte_chest_dl_t *q,
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cf_t *input[SRSLTE_MAX_PORTS],
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cf_t *ce[SRSLTE_MAX_PORTS][SRSLTE_MAX_PORTS],
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uint32_t sf_idx,
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uint32_t nof_rx_antennas,
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uint16_t mbsfn_area_id);
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SRSLTE_API int srslte_chest_dl_estimate_port(srslte_chest_dl_t *q,
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cf_t *input,
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cf_t *ce,
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uint32_t sf_idx,
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uint32_t port_id,
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uint32_t rxant_id);
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SRSLTE_API float srslte_chest_dl_get_noise_estimate(srslte_chest_dl_t *q);
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SRSLTE_API float srslte_chest_dl_get_snr(srslte_chest_dl_t *q);
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SRSLTE_API float srslte_chest_dl_get_rssi(srslte_chest_dl_t *q);
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SRSLTE_API float srslte_chest_dl_get_rsrq(srslte_chest_dl_t *q);
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SRSLTE_API float srslte_chest_dl_get_rsrp_port(srslte_chest_dl_t *q,
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uint32_t port);
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SRSLTE_API float srslte_chest_dl_get_rsrp(srslte_chest_dl_t *q);
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#endif
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