mirror of https://github.com/PentHertz/srsLTE.git
164 lines
5.3 KiB
C
164 lines
5.3 KiB
C
/**
|
|
*
|
|
* \section COPYRIGHT
|
|
*
|
|
* Copyright 2013-2021 Software Radio Systems Limited
|
|
*
|
|
* By using this file, you agree to the terms and conditions set
|
|
* forth in the LICENSE file which can be found at the top level of
|
|
* the distribution.
|
|
*
|
|
*/
|
|
|
|
/**********************************************************************************************
|
|
* 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 srsran_refsignal_t object for creating the LTE
|
|
* CSR signal.
|
|
*
|
|
* Reference:
|
|
*********************************************************************************************/
|
|
|
|
#ifndef SRSRAN_CHEST_DL_H
|
|
#define SRSRAN_CHEST_DL_H
|
|
|
|
#include <stdio.h>
|
|
|
|
#include "srsran/config.h"
|
|
|
|
#include "srsran/phy/ch_estimation/chest_common.h"
|
|
#include "srsran/phy/ch_estimation/refsignal_dl.h"
|
|
#include "srsran/phy/common/phy_common.h"
|
|
#include "srsran/phy/resampling/interp.h"
|
|
#include "srsran/phy/sync/pss.h"
|
|
#include "wiener_dl.h"
|
|
|
|
typedef struct SRSRAN_API {
|
|
cf_t* ce[SRSRAN_MAX_PORTS][SRSRAN_MAX_PORTS];
|
|
uint32_t nof_re;
|
|
float noise_estimate;
|
|
float noise_estimate_dbm;
|
|
float snr_db;
|
|
float snr_ant_port_db[SRSRAN_MAX_PORTS][SRSRAN_MAX_PORTS];
|
|
float rsrp;
|
|
float rsrp_dbm;
|
|
float rsrp_neigh;
|
|
float rsrp_port_dbm[SRSRAN_MAX_PORTS];
|
|
float rsrp_ant_port_dbm[SRSRAN_MAX_PORTS][SRSRAN_MAX_PORTS];
|
|
float rsrq;
|
|
float rsrq_db;
|
|
float rsrq_ant_port_db[SRSRAN_MAX_PORTS][SRSRAN_MAX_PORTS];
|
|
float rssi_dbm;
|
|
float cfo;
|
|
float sync_error;
|
|
} srsran_chest_dl_res_t;
|
|
|
|
// Noise estimation algorithm
|
|
typedef enum SRSRAN_API {
|
|
SRSRAN_NOISE_ALG_REFS = 0,
|
|
SRSRAN_NOISE_ALG_PSS,
|
|
SRSRAN_NOISE_ALG_EMPTY,
|
|
} srsran_chest_dl_noise_alg_t;
|
|
|
|
// Channel estimator algorithm
|
|
typedef enum SRSRAN_API {
|
|
SRSRAN_ESTIMATOR_ALG_AVERAGE = 0,
|
|
SRSRAN_ESTIMATOR_ALG_INTERPOLATE,
|
|
SRSRAN_ESTIMATOR_ALG_WIENER,
|
|
} srsran_chest_dl_estimator_alg_t;
|
|
|
|
typedef struct SRSRAN_API {
|
|
srsran_cell_t cell;
|
|
uint32_t nof_rx_antennas;
|
|
|
|
srsran_refsignal_t csr_refs;
|
|
srsran_refsignal_t** mbsfn_refs;
|
|
|
|
srsran_wiener_dl_t* wiener_dl;
|
|
|
|
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
|
|
|
|
srsran_interp_linsrsran_vec_t srsran_interp_linvec;
|
|
srsran_interp_lin_t srsran_interp_lin;
|
|
srsran_interp_lin_t srsran_interp_lin_3;
|
|
srsran_interp_lin_t srsran_interp_lin_mbsfn;
|
|
|
|
float rssi[SRSRAN_MAX_PORTS][SRSRAN_MAX_PORTS];
|
|
float rsrp[SRSRAN_MAX_PORTS][SRSRAN_MAX_PORTS];
|
|
float rsrp_corr[SRSRAN_MAX_PORTS][SRSRAN_MAX_PORTS];
|
|
float noise_estimate[SRSRAN_MAX_PORTS][SRSRAN_MAX_PORTS];
|
|
float sync_err[SRSRAN_MAX_PORTS][SRSRAN_MAX_PORTS];
|
|
float cfo;
|
|
|
|
/* Use PSS for noise estimation in LS linear interpolation mode */
|
|
cf_t pss_signal[SRSRAN_PSS_LEN];
|
|
cf_t tmp_pss[SRSRAN_PSS_LEN];
|
|
cf_t tmp_pss_noisy[SRSRAN_PSS_LEN];
|
|
|
|
} srsran_chest_dl_t;
|
|
|
|
typedef struct SRSRAN_API {
|
|
srsran_chest_dl_estimator_alg_t estimator_alg;
|
|
srsran_chest_dl_noise_alg_t noise_alg;
|
|
|
|
srsran_chest_filter_t filter_type;
|
|
float filter_coef[2];
|
|
|
|
uint16_t mbsfn_area_id;
|
|
bool rsrp_neighbour;
|
|
bool cfo_estimate_enable;
|
|
uint32_t cfo_estimate_sf_mask;
|
|
bool sync_error_enable;
|
|
|
|
} srsran_chest_dl_cfg_t;
|
|
|
|
SRSRAN_API int srsran_chest_dl_init(srsran_chest_dl_t* q, uint32_t max_prb, uint32_t nof_rx_antennas);
|
|
|
|
SRSRAN_API void srsran_chest_dl_free(srsran_chest_dl_t* q);
|
|
|
|
SRSRAN_API int srsran_chest_dl_res_init(srsran_chest_dl_res_t* q, uint32_t max_prb);
|
|
SRSRAN_API int srsran_chest_dl_res_init_re(srsran_chest_dl_res_t* q, uint32_t nof_re);
|
|
|
|
SRSRAN_API void srsran_chest_dl_res_set_identity(srsran_chest_dl_res_t* q);
|
|
|
|
SRSRAN_API void srsran_chest_dl_res_set_ones(srsran_chest_dl_res_t* q);
|
|
|
|
SRSRAN_API void srsran_chest_dl_res_free(srsran_chest_dl_res_t* q);
|
|
|
|
/* These functions change the internal object state */
|
|
|
|
SRSRAN_API int srsran_chest_dl_set_mbsfn_area_id(srsran_chest_dl_t* q, uint16_t mbsfn_area_id);
|
|
|
|
SRSRAN_API int srsran_chest_dl_set_cell(srsran_chest_dl_t* q, srsran_cell_t cell);
|
|
|
|
/* These functions do not change the internal state */
|
|
|
|
SRSRAN_API int srsran_chest_dl_estimate(srsran_chest_dl_t* q,
|
|
srsran_dl_sf_cfg_t* sf,
|
|
cf_t* input[SRSRAN_MAX_PORTS],
|
|
srsran_chest_dl_res_t* res);
|
|
|
|
SRSRAN_API int srsran_chest_dl_estimate_cfg(srsran_chest_dl_t* q,
|
|
srsran_dl_sf_cfg_t* sf,
|
|
srsran_chest_dl_cfg_t* cfg,
|
|
cf_t* input[SRSRAN_MAX_PORTS],
|
|
srsran_chest_dl_res_t* res);
|
|
|
|
SRSRAN_API srsran_chest_dl_estimator_alg_t srsran_chest_dl_str2estimator_alg(const char* str);
|
|
|
|
#endif // SRSRAN_CHEST_DL_H
|