mirror of https://github.com/PentHertz/srsLTE.git
89 lines
3.1 KiB
C
89 lines
3.1 KiB
C
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2021 Software Radio Systems Limited
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*
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* By using this file, you agree to the terms and conditions set
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* forth in the LICENSE file which can be found at the top level of
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* the distribution.
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*
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*/
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#ifndef SRSRAN_CHEST_DL_NBIOT_H
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#define SRSRAN_CHEST_DL_NBIOT_H
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#include <stdio.h>
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#include "srsran/config.h"
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#include "srsran/phy/ch_estimation/chest_common.h"
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#include "srsran/phy/ch_estimation/chest_dl.h"
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#include "srsran/phy/ch_estimation/refsignal_dl_nbiot.h"
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#include "srsran/phy/common/phy_common.h"
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#include "srsran/phy/resampling/interp.h"
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/*! \brief Downlink channel estimation for NB-IoT
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*
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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 srsran_refsignal_t object for creating the LTE CSR signal.
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*/
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typedef struct {
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srsran_nbiot_cell_t cell;
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srsran_refsignal_dl_nbiot_t nrs_signal;
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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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uint32_t smooth_filter_len;
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float smooth_filter[SRSRAN_CHEST_MAX_SMOOTH_FIL_LEN];
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srsran_interp_linsrsran_vec_t srsran_interp_linvec;
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srsran_interp_lin_t srsran_interp_lin;
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float rssi[SRSRAN_MAX_PORTS];
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float rsrp[SRSRAN_MAX_PORTS];
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float noise_estimate[SRSRAN_MAX_PORTS];
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srsran_chest_dl_noise_alg_t noise_alg;
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} srsran_chest_dl_nbiot_t;
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SRSRAN_API int srsran_chest_dl_nbiot_init(srsran_chest_dl_nbiot_t* q, uint32_t max_prb);
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SRSRAN_API void srsran_chest_dl_nbiot_free(srsran_chest_dl_nbiot_t* q);
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SRSRAN_API int srsran_chest_dl_nbiot_set_cell(srsran_chest_dl_nbiot_t* q, srsran_nbiot_cell_t cell);
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SRSRAN_API void srsran_chest_dl_nbiot_set_smooth_filter(srsran_chest_dl_nbiot_t* q, float* filter, uint32_t filter_len);
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SRSRAN_API void srsran_chest_dl_nbiot_set_smooth_filter3_coeff(srsran_chest_dl_nbiot_t* q, float w);
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SRSRAN_API void srsran_chest_dl_nbiot_set_noise_alg(srsran_chest_dl_nbiot_t* q,
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srsran_chest_dl_noise_alg_t noise_estimation_alg);
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SRSRAN_API int srsran_chest_dl_nbiot_estimate(srsran_chest_dl_nbiot_t* q, cf_t* input, cf_t** ce, uint32_t sf_idx);
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SRSRAN_API int srsran_chest_dl_nbiot_estimate_port(srsran_chest_dl_nbiot_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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SRSRAN_API float srsran_chest_dl_nbiot_get_noise_estimate(srsran_chest_dl_nbiot_t* q);
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SRSRAN_API float srsran_chest_dl_nbiot_get_snr(srsran_chest_dl_nbiot_t* q);
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SRSRAN_API float srsran_chest_dl_nbiot_get_rssi(srsran_chest_dl_nbiot_t* q);
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SRSRAN_API float srsran_chest_dl_nbiot_get_rsrq(srsran_chest_dl_nbiot_t* q);
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SRSRAN_API float srsran_chest_dl_nbiot_get_rsrp(srsran_chest_dl_nbiot_t* q);
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#endif // SRSRAN_CHEST_DL_NBIOT_H
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