/** * * \section COPYRIGHT * * Copyright 2013-2015 Software Radio Systems Limited * * \section LICENSE * * This file is part of the srsLTE library. * * srsLTE is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License as * published by the Free Software Foundation, either version 3 of * the License, or (at your option) any later version. * * srsLTE is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Affero General Public License for more details. * * A copy of the GNU Affero General Public License can be found in * the LICENSE file in the top-level directory of this distribution * and at http://www.gnu.org/licenses/. * */ /********************************************************************************************** * File: chest_dl.h * * Description: 3GPP LTE Downlink channel estimator and equalizer. * Estimates the channel in the resource elements transmitting references and * interpolates for the rest of the resource grid. * The equalizer uses the channel estimates to produce an estimation of the * transmitted symbol. * This object depends on the srslte_refsignal_t object for creating the LTE * CSR signal. * * Reference: *********************************************************************************************/ #ifndef CHEST_DL_ #define CHEST_DL_ #include #include "srslte/config.h" #include "srslte/phy/ch_estimation/chest_common.h" #include "srslte/phy/resampling/interp.h" #include "srslte/phy/ch_estimation/refsignal_dl.h" #include "srslte/phy/common/phy_common.h" #include "srslte/phy/sync/pss.h" typedef enum { SRSLTE_NOISE_ALG_REFS, SRSLTE_NOISE_ALG_PSS, SRSLTE_NOISE_ALG_EMPTY, } srslte_chest_dl_noise_alg_t; typedef struct { srslte_cell_t cell; srslte_refsignal_t csr_refs; srslte_refsignal_t **mbsfn_refs; cf_t *pilot_estimates; cf_t *pilot_estimates_average; cf_t *pilot_recv_signal; cf_t *tmp_noise; cf_t *tmp_cfo_estimate; #ifdef FREQ_SEL_SNR float snr_vector[12000]; float pilot_power[12000]; #endif uint32_t smooth_filter_len; float smooth_filter[SRSLTE_CHEST_MAX_SMOOTH_FIL_LEN]; srslte_interp_linsrslte_vec_t srslte_interp_linvec; srslte_interp_lin_t srslte_interp_lin; srslte_interp_lin_t srslte_interp_lin_3; srslte_interp_lin_t srslte_interp_lin_mbsfn; float rssi[SRSLTE_MAX_PORTS][SRSLTE_MAX_PORTS]; float rsrp[SRSLTE_MAX_PORTS][SRSLTE_MAX_PORTS]; float noise_estimate[SRSLTE_MAX_PORTS][SRSLTE_MAX_PORTS]; float cfo; bool cfo_estimate_enable; uint32_t cfo_estimate_sf_mask; /* Use PSS for noise estimation in LS linear interpolation mode */ cf_t pss_signal[SRSLTE_PSS_LEN]; cf_t tmp_pss[SRSLTE_PSS_LEN]; cf_t tmp_pss_noisy[SRSLTE_PSS_LEN]; srslte_chest_dl_noise_alg_t noise_alg; int last_nof_antennas; bool average_subframe; } srslte_chest_dl_t; SRSLTE_API int srslte_chest_dl_init(srslte_chest_dl_t *q, uint32_t max_prb); SRSLTE_API void srslte_chest_dl_free(srslte_chest_dl_t *q); SRSLTE_API int srslte_chest_dl_set_mbsfn_area_id(srslte_chest_dl_t *q, uint16_t mbsfn_area_id); SRSLTE_API int srslte_chest_dl_set_cell(srslte_chest_dl_t *q, srslte_cell_t cell); SRSLTE_API void srslte_chest_dl_set_smooth_filter(srslte_chest_dl_t *q, float *filter, uint32_t filter_len); SRSLTE_API void srslte_chest_dl_set_smooth_filter3_coeff(srslte_chest_dl_t* q, float w); SRSLTE_API void srslte_chest_dl_set_noise_alg(srslte_chest_dl_t *q, srslte_chest_dl_noise_alg_t noise_estimation_alg); SRSLTE_API int srslte_chest_dl_estimate_multi(srslte_chest_dl_t *q, cf_t *input[SRSLTE_MAX_PORTS], cf_t *ce[SRSLTE_MAX_PORTS][SRSLTE_MAX_PORTS], uint32_t sf_idx, uint32_t nof_rx_antennas); SRSLTE_API int srslte_chest_dl_estimate(srslte_chest_dl_t *q, cf_t *input, cf_t *ce[SRSLTE_MAX_PORTS], uint32_t sf_idx); SRSLTE_API int srslte_chest_dl_estimate_multi_mbsfn(srslte_chest_dl_t *q, cf_t *input[SRSLTE_MAX_PORTS], cf_t *ce[SRSLTE_MAX_PORTS][SRSLTE_MAX_PORTS], uint32_t sf_idx, uint32_t nof_rx_antennas, uint16_t mbsfn_area_id); SRSLTE_API int srslte_chest_dl_estimate_port(srslte_chest_dl_t *q, cf_t *input, cf_t *ce, uint32_t sf_idx, uint32_t port_id, uint32_t rxant_id); SRSLTE_API void srslte_chest_dl_cfo_estimate_enable(srslte_chest_dl_t *q, bool enable, uint32_t mask); SRSLTE_API void srslte_chest_dl_average_subframe(srslte_chest_dl_t *q, bool enable); SRSLTE_API float srslte_chest_dl_get_noise_estimate(srslte_chest_dl_t *q); SRSLTE_API float srslte_chest_dl_get_cfo(srslte_chest_dl_t *q); SRSLTE_API float srslte_chest_dl_get_snr(srslte_chest_dl_t *q); SRSLTE_API float srslte_chest_dl_get_snr_ant_port(srslte_chest_dl_t *q, uint32_t ant_idx, uint32_t port_idx); SRSLTE_API float srslte_chest_dl_get_rssi(srslte_chest_dl_t *q); SRSLTE_API float srslte_chest_dl_get_rsrq(srslte_chest_dl_t *q); SRSLTE_API float srslte_chest_dl_get_rsrq_ant_port(srslte_chest_dl_t *q, uint32_t ant_idx, uint32_t port); SRSLTE_API float srslte_chest_dl_get_rsrp_ant_port(srslte_chest_dl_t *q, uint32_t ant_idx, uint32_t port); SRSLTE_API float srslte_chest_dl_get_rsrp_port(srslte_chest_dl_t *q, uint32_t port); SRSLTE_API float srslte_chest_dl_get_rsrp(srslte_chest_dl_t *q); #endif